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19-3520; Rev 0; 11/04
MAX1531 Evaluation Kit
General Description
The MAX1531 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides logic and bias power required for liquid crystal display (LCD) monitors. The EV kit contains a step-down switching regulator, a logic-supply linear regulator, a source-driver-supply linear regulator, a gamma-reference linear regulator, a two-stage positive charge pump and linear regulator for the TFT gate-on supply, and a one-stage negative charge pump and linear regulator for the TFT gate-off supply. The source-driver supply, the gamma-reference supply, the gate-on supply, and the gate-off supply can be sequenced in any power-up order. The EV kit also includes a MAX1522 step-up switching regulator to provide a higher output voltage option for the source-driver supply and the gamma reference. The EV kit produces the output voltages listed in the features column using a +10.5V to +24V input voltage range. The input range can be reduced to +9.5V if the included MAX1522 step-up regulator circuit is used. If lower output voltages are acceptable, the input range can be further reduced to +8V. The EV kit features undervoltage protection for the input, overcurrent protection for the step-down switching regulator, and overload protection for the sourcedrive linear regulator. Operation at 500kHz allows the use of small surface-mount components. The EV kit also evaluates the MAX1530.
Features
Output Voltages (Input Range = +10.5V to +24V or +9.5V to +24V Using Included MAX1522 Circuit) +3.3V Output at 1.5A (Step-Down Switching Regulator) +2.5V Output at 500mA (Logic-Supply Regulator) +10V Output at 500mA (Source-Driver Supply Regulator) +9.7V Output at 50mA (Gamma-Reference Regulator) +25V Output at 25mA (Positive Charge Pump and Linear Regulator) -9V Output at 50mA (Negative Charge Pump and Linear Regulator) +8V to +24V Input Range (Reduced Output Voltages) Resistor-Adjustable Outputs 92% Efficiency (Step-Down Switching Regulator) 250kHz/500kHz Selectable Step-Down Switching Frequency Programmable Power-Up Sequencing Soft-Start for All Outputs Multilevel Protection Resistor-Adjustable Input Undervoltage Threshold Output Undervoltage Shutdown Overcurrent Protection for One Linear Regulator Current Limit for the Step-Down Switching Regulator External Step-Up Switching Regulator (MAX1522) Included Also Evaluates the MAX1530 (IC Replacement Required) Low-Profile, Surface-Mount Components Fully Assembled and Tested
Evaluates: MAX1530/MAX1531
Component List
DESIGNATION C1, C4 C2, C23 C3 QTY 2 0 1 DESCRIPTION 1F 10%, 25V X7R ceramic capacitors (0805) TDK C2012X7R1E105K Not installed capacitors (0603) 4.7F 10%, 25V X7R ceramic capacitor (1210) TDK C3225X7R1E475K 0.1F 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K 22F 20%, 6.3V X7R ceramic capacitor (1206) TDK C3216X7R0J226M
Ordering Information
PART MAX1531EVKIT TEMP RANGE 0C to +70C IC PACKAGE 32 TQFN (5mm x 5mm)
C5, C6, C8, C11, C14, C15, C17, C18, C20
9
C7
1
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
Component List (continued)
DESIGNATION C9 QTY 1 DESCRIPTION 10F 20%, 6.3V X5R ceramic capacitor (1206) TDK C3216X5R0J106M 470pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H471K 0.47F 10%, 16V X7R ceramic capacitors (0805) TDK C2012X7R1C474K 4.7F 10%, 16V X7R ceramic capacitors (1206) TDK C3216X7R1C475K 0.47F 20%, 50V X7R ceramic capacitor (1210) TDK C3225X7R1H474M 2.2F 10%, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E225K 10F 20%, 25V X5R ceramic capacitor (1210) TDK C3225X5R1E106M 1F 10%, 10V X5R ceramic capacitor (0603) TDK C1608X5R1A105K 100mA, 30V Schottky diodes (SOD523) Central Semiconductor CMOSH-3 1A, 30V Schottky diode (S-flat) Toshiba CRS02 250mA, 100V dual diodes (SOT23) Central Semiconductor CMPD6001S 250mA, 75V high-speed silicon diode (SOD-523) Central Semiconductor CMOD4448 3-pin headers 2-pin headers 3-way jumpers (4 pins) 4-way jumpers (5 pins) Q1, Q4 2 DESIGNATION L1 L2 QTY 1 1 DESCRIPTION 10H, 2.3ADC inductor Sumida CDR7D28MN-100 22H, 0.90ADC inductor Sumida CDRH5D28-220 2.5A, 30V dual n-channel MOSFET (Super SOT-6) Fairchild Semiconductor FDC6561AN 5.2A, 30V n-channel MOSFET (Super SOT-6) Fairchild Semiconductor FDC633N 3A, 60V low-saturation pnp bipolar transistors (SOT-223) Fairchild Semiconductor NZT660A 200mA, 40V pnp bipolar transistors (SOT23) Central Semiconductor CMPT3906 200mA, 40V npn bipolar transistors (SOT23) Central Semiconductor CMPT3904 17.8k 1% resistor (0805) 10.7k 1% resistors (0805) 124k 1% resistor (0805) 20.0k 1% resistor (0805) 100k 5% resistors (0805) 6.8k 5% resistors (0805) 10.0k 1% resistors (0805) 301k 1% resistor (0805) 221k 1% resistor (0805) 121k 1% resistor (0805) 68.1k 1% resistors (0805) 43.2k 1% resistor (0805) 1.5k 5% resistor (0805) 75.0k 1% resistor (0805) 200k 1% resistor (0805) 10.5k 1% resistor (0805)
C10
1
N1
1
C12, C19
2
N2
1
C13, C25
2
C16
1
Q2, Q3
2
C21, C22
2
Q5, Q6 R1 R2, R23 R3 R4 R5, R6, R7, R11 R8, R17, R24, R27 R9, R10, R19, R32 R12 R13 R14 R15, R18 R16 R21 R22 R25 R26
2 1 2 1 1 4 4 4 1 1 1 2 1 1 1 1 1
C24
1
C26
1
D1, D6
2
D2 D3, D4, D5
1 3
D7 JU1, JU12-JU16 JU2, JU3 JU4-JU7 JU8-JU11
1
6 2 4 4
2
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MAX1531 Evaluation Kit
Component List (continued)
DESIGNATION R28 R29 R30 R31 R33 R34 R35, R36 R37, R38 R39-R42 U1 U2 None None QTY 1 1 1 1 1 0 2 2 4 1 1 16 1 DESCRIPTION 90.9k 1% resistor (0805) 48.7k 1% resistor (0805) 1 5% resistor (0805) 110k 1% resistor (0805) 0.050 1% resistor (1206) IRC LRC-LR 1206-01-R050-F Not installed resistor (0805) 1.00 1% resistors (0805) 10 5% resistors (0805) 2.0k 5% resistors (0805) MAX1531ETJ (32-pin TQFN) MAX1522EUT-T (6-pin SOT23) Shunts (see table for jumper settings) MAX1531 PC board
3) Verify that a shunt is across pins 1 and 3 of jumpers JU4, JU5, JU6, JU7, and JU8. 4) Verify that a shunt is across pins 1 and 5 of jumper JU9. 5) Verify that a shunt is across pins 1 and 4 of jumper JU11. 6) Verify that a shunt is across pins 2 and 3 of jumpers JU13, JU14, JU15, and JU16. 7) Connect the positive terminal of the input power supply to the PIN pad. Connect the negative terminal of the input power supply to the PGND pad. 8) Turn on the power supply and verify that the stepdown regulator output (VOUT) is +3.3V. 9) Verify that the internal 5V linear regulator output (VL) is +5V. 10) Verify that the logic-supply linear regulator output (VLOG) is +2.5V. 11) Verify that the source-driver-supply linear regulator output (VSRC) is +10V. 12) Verify that the gamma-reference linear regulator output (VGAM) is +9.7V. 13) Verify that the gate-on linear regulator output (GON) is +25V. 14) Verify that the gate-off linear regulator output (GOFF) is -9V. For instructions on selecting the feedback resistors for other output voltages, see the Output Voltage Selection section.
Evaluates: MAX1530/MAX1531
Quick Start
The MAX1531 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. The MAX1531 EV kit operates with up to +24V inputs. However, due to external-component voltage stress limitations, default jumper configurations must be modified for operation above +13.2V. See the Positive Charge Pump and Gate-On Linear Regulator Output Voltage (GON) sections.
Detailed Description
The MAX1531 EV kit contains a step-down switching regulator, a linear regulator for a low-voltage logic supply, a high-current linear regulator for a source-driver supply, a linear regulator for a gamma reference, a twostage positive charge pump with a positive high-voltage linear regulator, and a one-stage negative charge pump with a negative linear regulator. The EV kit operates from a +10.5V and +24V DC power supply, which
Recommended Equipment
* +10.5V to +13.2V, 2A DC power supply * One voltmeter 1) Verify that a shunt is across pins 1 and 2 of jumpers JU1, JU10, and JU12. 2) Verify that there are no shunts across jumpers JU2 and JU3.
Component Suppliers
SUPPLIER Central Semiconductor Fairchild IRC Sumida TDK Toshiba PHONE 631-435-1110 888-522-5372 361-992-7900 847-545-6700 847-803-6100 949-455-2000 FAX 631-435-1824 -- 361-992-3377 847-545-6720 847-390-4405 949-859-3963 WEBSITE www.centralsemi.com www.fairchildsemi.com www.irctt.com www.sumida.com www.component.tdk.com www.toshiba.com/taec
Note: Indicate you are using the MAX1530/MAX1531 when contacting these manufacturers. _______________________________________________________________________________________ 3
MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
can provide at least 2A. The step-down switching regulator's switching frequency is jumper configurable between 250kHz and 500kHz. The adjustable input undervoltage protection (EN) protects the EV kit from undervoltage conditions. The step-up switching regulator and the source-drive regulator are protected against overloads. The step-down switching regulator (VOUT) generates a +3.3V output and can provide at least 1.5A. The stepdown switching-regulator output voltage can be adjusted as low as +1.24V using different feedback resistors (see the Output Voltage Selection section). The logic voltage supply (VLOG) is set to +2.5V using a linear regulator controller and an external pnp bipolar pass transistor. This logic voltage supply can provide at least 500mA of current. The logic-voltage-supply linear regulator's output can be adjusted between +1.24V and its input supply, which is the step-down regulator's output voltage (see the Output Voltage Selection section). The source-driver supply (VSRC) is set to +10V using a linear regulator controller and an external pnp bipolar pass transistor. This source-driver supply can provide at least 500mA of current. The source-drive linear regulator's output can be adjusted between +1.24V and its input voltage, which is either the EV kit input voltage (PIN) or the output of the MAX1522 step-up regulator, depending on jumper JU15 (see the Output Voltage Selection section). The gamma reference (VGAM) is set to +9.7V using a linear regulator controller and an external pnp bipolar pass transistor. This gamma reference can provide at least 50mA of current. The gamma linear regulator's output can be adjusted between +1.24V and its input voltage, which is either the EV kit input voltage (PIN) or the output of the MAX1522 step-up regulator, depending on jumper JU14 (see the Output Voltage Selection section). The TFT gate-on supply (GON) uses a two-stage positive charge pump to generate approximately +33V. The output is postregulated to +25V using a linear regulator controller and an external pnp bipolar pass transistor and can provide at least 25mA. The positive linear regulator's output can be adjusted between +1.24V and its input, which depends on the EV kit's input voltage and the charge-pump configuration, jumpers JU12 and JU13 (see the Output Voltage Selection section). The TFT gate-off supply (GOFF) uses a negative charge pump to generate approximately -11V. The output is postregulated to -9V using a linear regulator controller and an external npn bipolar pass transistor and can provide greater than 50mA. The negative linear regulator's output can be adjusted between 0V and its input volt4
age, which is the output of the negative charge pump (see the Output Voltage Selection section). The EV kit also features power-up sequencing. After EN and SEQ go high, the logic voltage supply (VLOG) softstarts. The gamma reference, the gate-on supply, the source-driver supply, and the gate-off supply can softstart in any sequence by setting the appropriate jumpers (see the Power-Up Sequencing section). The EV kit includes a current-limit circuit for the stepdown switching regulator. The current-limit threshold is set by resistor-dividers R12, R13, and the RDS(on) of MOSFET N1 (refer to the MOSFET Selection and Current-Limit Setting section in the MAX1531 data sheet for further detail). The EV kit also includes current overload protection for the source-driver supply voltage. The MAX1531 will shut down if the source-driver supply exceeds a current threshold. The output current overload threshold is set by sense resistors R35 and R36 (refer to the Overcurrent Protection Block (CSH, CSL) section in the MAX1531 data sheet for further detail).
Jumper Selection
Enable (EN)
The MAX1531 features an enable (EN) pin that enables or disables the MAX1531 and the EV kit's output. The EN pin can also be used with resistor-dividers R3 and R4 to set the lower limit of the input voltage range (refer to the On/Off Control (EN) section in the MAX1531 data sheet for further detail). The 3-pin jumper JU1 provides an option to enable, disable, or use the undervoltage threshold feature for the MAX1531 EV kit. Table 1 lists the selectable jumper options.
Table 1. Jumper JU1 Functions
SHUNT LOCATION None 1-2 (Default) 2-3 EN PIN Connected to GND Connected to PIN through resistordividers R3 and R4 Connected to VL MAX1531 (U1) IC STATUS Disabled Enabled when VPIN > 9V Enabled
Switching Frequency Selection (FREQ)
The MAX1531 EV kit features an option to choose the step-down switching regulator's operating frequency (JU2). Table 2 lists the selectable jumper options. The EV kit is configured for 500kHz operation. Optimum performance at 250kHz requires a larger inductor value (refer to the Inductor Selection section in the MAX1531 data sheet).
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MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
Table 2. Jumper JU2 Functions
SHUNT LOCATION Installed None (Default) FREQ PIN Connected to GND Connected to VL through R5 MAX1531 EV KIT FREQUENCY Frequency = 250kHz Frequency = 500kHz Installed Connected to GND
Table 3. Jumper JU3 Function
SHUNT LOCATION SEQ PIN MAX1531 STATE Sequence block disabled. VSRC, VGAM, GON, and GOFF disabled, regardless of ONL2 to ONL5 voltage levels.
Power-Up Sequencing (SEQ)
The EV kit features adjustable power-up sequencing for several of the linear regulators. After the MAX1531's EN pin goes high, the internal VL linear regulator starts up and the step-down switching regulator soft-starts. When the step-down regulator reaches regulation, the logic-voltage-supply linear regulator (VLOG) and the sequence block that controls the other four linear regulators are simultaneously enabled. The logic regulator soft-starts immediately but the sequence block starts only if SEQ is high. SEQ is controlled by JU3. Each linear regulator soft-starts individually when it is enabled. After SEQ goes high, the ONL2 to ONL5 pins each source current into C11, which controls the overall time for startup. Resistors R14, R15, and R16 determine the startup spacing between the respective regulator and JU8 to JU11 determine the startup order. Each regulator starts after SEQ is high and its ONL_ pin
None (Default)
Sequence block enabled. Each ONL_ sources 2A. VGAM soft-starts when ONL2 reaches 1.24V. Connected to GON soft-starts when ONL3 VL through R6 reaches 1.24V. VSRC soft-starts when ONL4 reaches 1.24V. GOFF soft-starts when ONL5 reaches 1.24V
exceeds 1.24V. JU4 to JU7 enable immediate startup of their respective regulator after the step-down regulator reaches regulation and SEQ is high, without additional delay. (See the Power-Up Sequencing section.) See Tables 3 through 7 for configuring the jumpers.
Table 4. ONL2 Setting (JU4 and JU8)
JU4 SHUNT LOCATION 1-2 JU8 SHUNT LOCATION Don't Care ONL2 PIN Connected to VL through R39 Connected to GND Connected to R14 Connected to R15 Connected to R16 Connected to C11 SEQUENCING MODE Gamma linear regulator enabled immediately if JU3 is removed (SEQ = high) and step-down switching regulator soft-start is finished. Sequence not used. Gamma linear regulator disabled. Gamma linear regulator soft-starts about 6ms after sequence block enabled. Gamma linear regulator soft-starts about 9ms after sequence block enabled. Gamma linear regulator soft-starts about 12ms after sequence block enabled. Gamma linear regulator soft-starts about 15ms after sequence block enabled.
1-4
Don't Care 1-2 1-3 (Default)
1-3 (Default)
1-4 1-5
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MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
Table 5. ONL3 Setting (JU5 and JU9)
JU5 SHUNT LOCATION 1-2 JU9 SHUNT LOCATION Don't Care ONL3 PIN Connected to VL through R40 Connected to GND Connected to R14 Connected to R15 Connected to R16 Connected to C11 SEQUENCING MODE GON linear regulator enabled immediately if JU3 is removed (SEQ = high) and step-down switching regulator soft-start is finished. Sequence not used. GON linear regulator disabled. GON linear regulator soft-starts about 6ms after sequence block enabled. GON linear regulator soft-starts about 9ms after sequence block enabled. GON linear regulator soft-starts about 12ms after sequence block enabled. GON linear regulator soft-starts about 15ms after sequence block enabled.
1-4
Don't Care 1-2 1-3
1-3 (Default) 1-4 1-5 (Default)
Table 6. ONL4 Setting (JU6 and JU10)
JU6 SHUNT LOCATION 1-2 JU10 SHUNT LOCATION Don't Care ONL4 PIN Connected to VL through R41 Connected to GND Connected to R14 Connected to R15 Connected to R16 Connected to C11 SEQUENCING MODE VSRC linear regulator enabled immediately if JU3 is removed (SEQ = high) and step-down switching regulator soft-start is finished. Sequence not used. VSRC linear regulator disabled. VSRC linear regulator soft-starts about 6ms after sequence block enabled. VSRC linear regulator soft-starts about 9ms after sequence block enabled. VSRC linear regulator soft-starts about 12ms after sequence block enabled. VSRC linear regulator soft-starts about 15ms after sequence block enabled.
1-4
Don't Care 1-2 (Default) 1-3
1-3 (Default) 1-4 1-5
6
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MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
Table 7. ONL5 Setting (JU7 and JU11)
JU7 SHUNT LOCATION 1-2 JU11 SHUNT LOCATION Don't Care ONL5 PIN Connected to VL through R42 Connected to GND Connected to R14 Connected to R15 Connected to R16 Connected to C11 SEQUENCING MODE GOFF linear regulator enabled immediately if JU3 is removed (SEQ = high) and step-down switching regulator soft-start is finished. Sequence not used. GOFF linear regulator disabled. GOFF linear regulator soft-starts about 6ms after sequence block enabled. GOFF linear regulator soft-starts about 9ms after sequence block enabled. GOFF linear regulator soft-starts about 12ms after sequence block enabled. GOFF linear regulator soft-starts about 15ms after sequence block enabled.
1-4
Don't Care 1-2 1-3
1-3 (Default)
1-4 (Default) 1-5
Positive Charge Pump
The positive charge pump of the MAX1531 EV kit powers the GON linear regulator and features an option to cascade up to two charge-pump stages. The charge pump's first stage can be connected to PIN or VOUT, and the charge pump's second stage can be connected to PIN or the previous stage. Jumpers JU12 and JU13 configure the number of stages and select the voltage source for the positive charge pump on the MAX1531 EV kit. Tables 8 and 9 list the jumper options. The default configuration of the positive charge pump of the MAX1531 EV kit is a two-stage charge pump powered from PIN as indicated in Tables 8 and 9. Since the positive charge pump powers the GON linear regulator, ensure that the combination of the chargepump configuration and the input voltage range (PIN) does not over stress the GON linear regulator's external pass transistor. The V CEO maximum rating of the MMBT3904 used on this EV kit is 40V. If the input voltage (PIN) exceeds +13.2V, either reconfigure the charge pump (using JU12 and JU13) as a two-stage charge pump from VOUT or a one-stage charge pump from PIN, as appropriate, or select a higher-voltagerated transistor for Q3. Also, if higher charge-pump voltages are required, ensure that Q6 and C15 are not over stressed. Refer to the Charge Pumps section of the MAX1531 data sheet for more information on selecting a charge-pump configuration.
Table 8. Jumper JU12 Functions
SHUNT LOCATION 1ST STAGE POSITIVE CHARGE PUMP Connected to PIN OPERATING MODE
1-2 (Default)
First stage of a two-stage charge pump connected to PIN. First stage of a two-stage charge pump connected to VOUT. The first stage is not used for one-stage charge pumps.
2-3
Connected to VOUT Not used
None
Table 9. Jumper JU13 Functions
SHUNT LOCATION 2ND STAGE POSITIVE CHARGE PUMP Connected to PIN OPERATING MODE
1-2
One-stage charge pump connected to PIN.
2-3 (Default) None
Connected to previous stage Last stage of a two-stage charge-pump charge pump. output Not used Charge pump not used.
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MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
VGAM Power Supply
The power supply for the VGAM linear regulator can be connected to PIN or STEP_UP. PIN is the input voltage for the EV kit. STEP_UP is the output of the MAX1522 step-up switching regulator circuit on the EV kit. Jumper JU14 selects the power supply for the VGAM linear regulator on the MAX1531 EV kit. Table 10 lists the jumper options.
Table 12. Jumper JU16 Functions
SHUNT LOCATION 1-2 2-3 (Default) MAX1522 SHDN PIN Connected to VOUT Connected to GND MAX1522 OPERATING MODE Enabled Disabled
Table 10. Jumper JU14 Functions
SHUNT LOCATION VGAM POWER SUPPLY Connected to STEP_UP Connected to PIN Not used OPERATING MODE
using JU16 and set JU14 and JU15 so that VGAM and VSRC use the step-up's output.
Output Voltage Selection
Step-Down Switching-Regulator Output Voltage (VOUT)
The MAX1531 EV kit's step-down switching-regulator output (VOUT) is set to +3.3V by feedback resistors R1 and R2. To generate output voltages other than +3.3V (from +1.24V up to 0.6 x VPIN), select different external voltage-divider resistors (R1, R2). Output capacitor C7 is rated to +6.3V. To set the output voltage greater than +6.3V, use a higher-voltage-rated capacitor. Refer to the Main Step-Down Regulator Output Voltage Selection section in the MAX1531 data sheet for instructions on selecting the resistors.
1-2 2-3 (Default) None
VGAM powered from the output of the MAX1522 stepup regulator. VGAM powered from PIN. VGAM not used.
VSRC Power Supply
The power supply for the VSRC linear regulator can be connected to PIN or STEP_UP. PIN is the input voltage for the EV kit. STEP_UP is the output of the MAX1522 step-up switching regulator circuit on the EV kit. Jumper JU15 selects the power supply for the VSRC linear regulator on the MAX1531 EV kit. Table 11 lists the jumper options.
Logic-Voltage-Supply Linear Regulator Output Voltage (VLOG)
The MAX1531 EV kit's logic-voltage-supply linear regulator output (VLOG) is set to +2.5V by feedback resistors R9 and R10. To generate output voltages other than +2.5V (from +1.24V up to VOUT) select different external voltage-divider resistors (R9, R10). Output capacitor C9 is rated to +6.3V. To set the output voltage greater than +6.3V, use a higher-voltage-rated capacitor. Refer to the Linear-Regulator Controllers Output Voltage Selection section in the MAX1531 data sheet for instructions on selecting the resistors.
Table 11. Jumper JU15 Functions
SHUNT LOCATION VSRC POWER SUPPLY Connected to STEP_UP Connected to PIN Not used OPERATING MODE
1-2 2-3 (Default) None
VSRC powered from the output of the MAX1522 stepup regulator. VSRC powered from PIN. VSRC not used.
Gamma-Reference Linear Regulator Output Voltage (VGAM)
The MAX1531 EV kit's gamma-reference linear regulator output (VGAM) is set to +9.7V by feedback resistors R18 and R19. To generate output voltages other than +9.7V (from +1.24V up to its input voltage) select different external voltage-divider resistors (R18, R19). Output capacitor C12 is rated to +16V. To set the output voltage greater than +16V, use a higher-voltage-rated capacitor. Refer to the Linear-Regulator Controllers Output Voltage Selection section in the MAX1531 data sheet for instructions on selecting the resistors.
The MAX1522 Step-Up Circuit
The MAX1531 EV kit includes a MAX1522 step-up switching regulator. This regulator is not generally needed, but is provided as a convenience for applications where the input voltage (PIN) can be less than VSRC. If the step-up is needed, enable the MAX1522
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MAX1531 Evaluation Kit
Gate-On Linear Regulator Output Voltage (GON)
The MAX1531 EV kit's gate-on linear regulator output (GON) is set to +25V by feedback resistors R25 and R26. To generate output voltages other than +25V (from +1.24V up to the linear regulator's input, which is the output of the positive charge pump), select different external voltage-divider resistors (R25, R26). Take care not to exceed either the pnp pass transistor's VCEO rating (40V) or the output capacitor's (C16) +50V rating. Before GON is enabled, Q3 is off and the positive charge pump's full output voltage is present across Q3. If the input voltage (PIN) exceeds 13.2V, do not power the EV kit with the charge pump configured as a twostage charge pump powered from PIN, as Q3's 40V rating will be exceeded. Configure JU12 and JU13 for a two-stage charge pump powered from VOUT or as a one-stage charge pump powered from PIN, whichever is appropriate. Alternatively, select a different transistor for Q3 and possibly Q6, which must withstand the same voltage, minus VPIN. If VPIN exceeds +20V, even a one-stage charge pump will exceed +40V, so either change Q3 or disable the charge pump entirely and power the linear regulator directly from PIN, whichever is appropriate. Refer to the Linear-Regulator Controllers Output Voltage Selection section in the MAX1531 data sheet for instruction on selecting the voltage-divider resistors. Also, refer to the Charge Pumps section for more information about configuring the positive charge pump.
Source-Supply Linear Regulator Output Voltage (VSRC)
The MAX1531 EV kit's source-supply linear regulator output (VSRC) is set to +10V by feedback resistors R22 and R23. To generate output voltages other than +10V (from +1.24V up to its input voltage) select different external voltage-divider resistors (R22, R23). Output capacitor C13 is rated to +16V. To set the output voltage greater than +16V, use a higher-voltage-rated capacitor. Refer to the Linear-Regulator Controllers Output Voltage Selection section in the MAX1531 data sheet for instructions on selecting the resistors.
Evaluates: MAX1530/MAX1531
Gate-Off Linear Regulator Output Voltage (GOFF)
The MAX1531 EV kit's negative linear regulator output (GOFF) is set to -9V by feedback resistors R28 and R29. To generate output voltages other than -9V (0V down to its input voltage), select different external voltage-divider resistors (R28, R29). Output capacitor C19 is rated to -16V. To set the output voltage below -16V, use a higher-voltage-rated capacitor. Refer to the Linear-Regulator Controllers Output Voltage Selection and Charge Pumps sections in the MAX1531 data sheet for instructions on selecting the resistors.
Evaluating the MAX1530
The MAX1531 EV kit can also evaluate the MAX1530. To evaluate the MAX1530, replace U1 with the MAX1530. Refer to the MAX1530/MAX1531 data sheets for additional information.
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9
Evaluates: MAX1530/MAX1531
JU1 VL 2 D1 R37 10 C3 4.7F 25V GND IN 28 VL EN IN C1 1F R30 1 1 LX 5 C7 22F 6.3V C2 OPEN 22 4 2 D7 2 3 1 Q1 2 VLOG PIN LX GND PIN C15 0.1F R24 6.8k 2 Q3 3 C16 0.47F 50V C23 OPEN D5 2 3 LX DRV5 FBL5 8 DRV4 VL 7 C13 R22 4.7F 75k 16V 1% FBL4 10 9 GON +25V AT 25mA GND VL D4 3 2 C6 0.1F C22 2.2F 3 R8 N1-B 6.8k R1 17.8k 1% L1 10H N1-A RESET DH LX 21 29 20 32 31 13 R11 100k IN C20 2 0.1F 1 DRV2 DRV3 2 3 R25 200k 1% Q6 3 FBL2 FBL3 CSL 15 1 C17 0.1F R27 6.8k 1 Q5 3 C19 0.47F D6 GND R21 1.5k 2 C18 0.1F R26 10.5k 1% ILIM 4 2 R18 C12 68.1k 0.47F 1% R19 10k 1% 6 STEP_UP 2 CSH C21 2.2F R36 1 1% 5 STEP_UP JU15 1 3 PIN 1 3 Q2 R17 1 6.8k R34 OPEN C10 470pF R38 10 1 SEQ FREQ ONL2 AGND 17 ONL3 DRV1 JU6 2 18 ONL4 COMP 1 19 ONL5 11 RSTIN 14 FB R9 R10 C9 10k 10k 10F 1% 1% 6.3V VL 4 JU7 2 3 4 1 2 R42 2k 3 FBL1 VL R41 2k PGND U1 23 6 27 BST R6 100k R7 100k 12 25 R39 VL 2k 26 2 3 2 3 4 2 1 JU5 2 R40 2k 4 JU4 1 16 VL RESET JU3 2 C4 1F 30 24 C5 0.1F VL PIN LX PIN 3 1 R3 124k 1%
MAX1531 Evaluation Kit
Figure 1. MAX1531 EV Kit Schematic--Sheet 1 of 2
R4 20.0k 1% VOUT +3.3V AT 1.5A LX
10
MAX1531
DL R2 10.7k 1% 3 21 1 JU12 2.5V AT 500mA 3 D3 C8 0.1F C14 0.1F 2 1 2 JU13 3 GND R12 301k 1% R13 221k 1% R35 1 1% 3 Q4 VSRC +10V AT 500mA 2 1 GOFF -9V AT 50mA R28 R29 90.9k 48.7k 1% 1% GND R23 10.7k 1%
VL
+5V
R5 100k
JU2
JU8
4
3
51
4 JU9
3
51
JU10 3 4
51
R14 121k 1%
JU11 3 4
51
PIN
R15 68.1k 1%
3 VGAM 2 9.7V AT 50mA JU14 1
R16 43.2k 1%
STEP_UP
______________________________________________________________________________________
C11 0.1F
MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
PIN
C25 4.7F VOUT C26 1F L2 22H D2 6 VCC 3 SET U2 EXT 5 3 4 STEP_UP R31 110k 1% R32 10.0k 1% R33 0.050 12 56 N2
MAX1522
1 3 JU16 2 4
SHDN GND 1
FB
2
C24 10F
Figure 2. MAX1531 EV Kit Schematic--Sheet 2 of 2
______________________________________________________________________________________
11
MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
Figure 3. MAX1531 EV Kit Component Placement Guide-- Component Side
Figure 4. MAX1531 EV Kit PC Board Layout--Component Side
Figure 5. MAX1531 EV Kit PC Board Layout--GND Layer 2
Figure 6. MAX1531 EV Kit PC Board Layout--VCC Layer 3
12
______________________________________________________________________________________
MAX1531 Evaluation Kit Evaluates: MAX1530/MAX1531
Figure 7. MAX1531 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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