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19-1917; Rev 0; 1/01
MAX1605 Evaluation Kit
General Description
The MAX1605 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a boost switching converter that generates a positive voltage to drive low-power LCD displays. The circuit is configured for a +18V output voltage and provides up to 30mA. Higher output voltages are possible by selecting different components. The IC operates from a +2.4V to +5.5V supply voltage but can boost battery voltages as low as +0.8V up to +30V at the output. Three different inductor current limits can be evaluated with the EV kit as configured. The MAX1605 EV kit demonstrates low quiescent current and high efficiency up to 88% for maximum battery life. Operation up to 500kHz allows the use of tiny surface-mount components. o Input Voltage +0.8V to +18V (as configured) +2.4V to +5.5V (IC VCC) o Output Voltage +18V Output Up to 30mA (as configured) o Output Voltage Adjustable with Resistors o Adjustable Inductor Current-Limit Setting o Internal MOSFET Switches o 1A (typ) IC Shutdown Current o Switching Frequency Up to 500kHz o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX1605
Component List
DESIGNATION C1 C2, C3 C4 QTY 1 2 1 DESCRIPTION 0.1F, 16V, X7R ceramic cap (0603) Taiyo Yuden EMK107BJ104KA 1.0F, 25V, X7R ceramic caps (1206) Taiyo Yuden TMK316BJ105KL 10pF, 50V ceramic cap (0603) Taiyo Yuden UMK107CG100DZ 500mA, 30V Schottky diode (SOD-123) Nihon EP05Q03L or Toshiba CRS02 10H, 700mA inductor Sumida CR32-100 2.2M 1% resistor (0805) 165k 1% resistor (0805) MAX1605EUT (6-pin SOT23) 3-pin headers Shunts (JU1, JU2) MAX1605 PC board MAX1605 data sheet MAX1605 EV kit data sheet SUPPLIER Nihon USA Sumida Taiyo Yuden Toshiba PART MAX1605EVKIT
Ordering Information
TEMP. RANGE 0C to +70C IC PACKAGE 6 SOT23-6
Component Suppliers
PHONE 661-867-2555 847-956-0666 408-573-4150 949-455-2000 FAX 661-867-2698 847-956-0702 408-573-4159 949-859-3963
D1
1
L1 R1 R2 U1 JU1, JU2 None None None None
1 1 1 1 2 2 1 1 1
Note: Please indicate that you are using the MAX1605 when contacting these component suppliers.
Quick Start
The MAX1605 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. 1) Connect a +0.8V to +18V DC power supply to the VIN pad. Connect the supply ground to the GND pad (or use the same supply and limits as in step 2). 2) Connect a +2.4V to +5.5V DC power supply to the VCC pad. Connect the supply ground to the GND pad. 3) Verify that shunts are across pins 1 and 2 of jumpers JU1 (SHDN) and JU2 (LIM, 500mA).
________________________________________________________________ Maxim Integrated Products
1
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MAX1605 Evaluation Kit Evaluates: MAX1605
4) Turn on the VCC power supply, followed by the VIN power-supply. Power-supply sequencing is not critical. 5) Verify that the output (VOUT) is +18V. For instructions on selecting the feedback resistors for other output voltages, refer to the Evaluating Other Output Voltages section in this document. Inductor Current Limit The MAX1605 EV kit features options for evaluating several different inductor current limits. The 3-pin jumper, JU2 selects the inductor current limit for the MAX1605 EV kit. Table 2 lists the selectable jumper options.
Detailed Description
The MAX1605 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a boost switching converter, generating +18V used to drive low power LCD displays. The circuit provides up to 30mA of current to the EV kit's output. Higher output voltages up to +30V are possible by selecting different feedback resistors. Power for the converter circuit can be supplied from a +0.8V to VOUT DC source or a multiple-cell lithium-ion (Li+) battery. The IC requires a +2.4V to +5.5V DC source. The IC can also be powered from the converter's input supply if the input voltage is limited to between +2.4V and +5.5V. Three different inductor current limits can be evaluated with the EV kit (125mA, 250mA, and 500mA) by changing a jumper position. The MAX1605 EV kit demonstrates low quiescent current (18A ICC operating current) and high efficiency up to 88% for maximum battery life.
Table 2. Jumper JU2 Function
SHUNT LOCATION 1 and 2 2 and 3 None LIM PIN Connected to VCC Connected to GND Floating INDUCTOR CURRENT LIMIT 500mA 125mA 250mA
Evaluating Other Output Voltages
Output The MAX1605 EV kit's boost converter output (VOUT) is set to +18V by two feedback resistors (R1, R2). To generate output voltages other than +18V (+0.8V to +30V), select different voltage-divider resistors (R1, R2). Capacitor C3 must be rated for higher than V OUT . Refer to the Setting the Output Voltages section in the MAX1605 data sheet for instructions on selecting the resistors. The output voltage (VOUT) is determined by the following equation: VOUT = VFB((R1/R2) + 1) where VFB = 1.25V.
Jumper Selection
Shutdown Mode The MAX1605 EV kit features a shutdown mode that reduces the MAX1605 shutdown current to less than 0.1A, thus preserving battery life. The 3-pin jumper, JU1, selects the shutdown mode for the MAX1605. Table 1 lists the selectable jumper options.
Single-Supply Operation
VIN and VCC The MAX1605 EV kit can be operated from a single power supply. To evaluate the EV kit with a single supply, connect a jumper wire from the VIN pad to the VCC pad. Connect a +2.4V (min) to +5.5V (max) power supply to the VIN or VCC pad.
Table 1. Jumper JU1 Functions
SHUNT LOCATION 1 and 2 SHDN PIN MAX1605 OUTPUT MAX1605 enabled, VOUT = +18V (as configured) Shutdown mode, VOUT = VIN - VDIODE
Connected to VIN
2 and 3
Connected to GND
2
_______________________________________________________________________________________
MAX1605 Evaluation Kit Evaluates: MAX1605
L1 10H VIN C2 1.0F GND JU1 SHDN 2 3 1 1 SHDN LX 4 VCC JU2 R1 2.2M 1% C4 10pF C3 1.0F
D1
VOUT
GND
U1 MAX1605
VCC
2
VCC
LIM
5
1 2 3 R2 165k 1%
C1 0.1F 3 GND FB 6
Figure 1. MAX1605 EV Kit Schematic
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3
MAX1605 Evaluation Kit Evaluates: MAX1605
ACTUAL BOARD DIMENSIONS: 2.4in x 1.9in Figure 2. MAX1605 EV Kit Component Placement Guide-- Component Side
ACTUAL BOARD DIMENSIONS: 2.4in x 1.9in Figure 3. MAX1605 EV Kit PC Board Layout--Component Side
ACTUAL BOARD DIMENSIONS: 2.4in x 1.9in Figure 4. MAX1605 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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