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19-0478; Rev 0; 3/96
Dual-Output Charge Pump with Shutdown
_______________General Description
The MAX864 CMOS, charge-pump, DC-DC voltage converter produces a positive and a negative output from a single positive input, and requires only four capacitors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.75V to +6.0V. The internal oscillator can be pin-programmed from 7kHz to 185kHz, allowing the quiescent current, capacitor size, and switching frequency to be optimized. The 55 output impedance permits useful output currents up to 20mA. The MAX864 also has a 1A logic-controlled shutdown. The MAX864 comes in a 16-pin QSOP package that uses the same board area as a standard 8-pin SOIC. For more space-sensitive applications, the MAX865 is available in an 8-pin MAX package, which uses half the board area of the MAX864.
____________________________Features
o Requires Only Four Capacitors o Dual Outputs (Positive and Negative) o Low Input Voltages: +1.75V to +6.0V o 1A Logic-Controlled Shutdown o Selectable Frequencies Allow Optimization of Capacitor Size and Supply Current
MAX864
______________Ordering Information
PART MAX864C/D MAX864EEE TEMP. RANGE 0C to +70C -40C to +85C PIN-PACKAGE Dice* 16 QSOP
________________________Applications
Low-Voltage GaAsFET Bias in Wireless Handsets VCO and GaAsFET Supply Split Supply from 2 to 4 Ni Cells or 1 Li+ Cell Low-Cost Split Supply for Low-Voltage Data-Acquisition Systems Split Supply for Analog Circuitry LCD Panels
* Contact factory for dice specifications.
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
C1- 1 C2+ 2 GND 3 C2- 4 V- 5 SHDN 6 FC1 7 FC0 8 16 C1+ 15 V+ 14 N.C.
VIN (+1.75V TO +6.0V)
IN C1+
V+
+2VIN
C1C2+
MAX864
MAX864
13 N.C. 12 IN 11 GND 10 N.C. 9 N.C.
VC2FC0 FC1 SHDN GND VIN
-2VIN
VIN
VIN
QSOP
________________________________________________________________ Maxim Integrated Products
1
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Dual-Output Charge Pump with Shutdown MAX864
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +12V SHDN, FC0, FC1 to GND .............................-0.3V to (V+ + 0.3V) IN to GND ..............................................................-0.3V to +6.2V V- to GND ...............................................................+0.3V to -12V V- Output Current .............................................................100mA V- Short Circuit to GND .................................................Indefinite Operating Temperature Range MAX864EEE......................................................-40C to +85C Continuous Power Dissipation (TA = +70C) QSOP (derate 8.70mW/C above +70C) .....................696mW Storage Temperature Range ............................ -65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS (Note 1)
(VIN = 5V, SHDN = VIN, circuit of Figure 1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SUPPLY Minimum Start-Up Voltage Maximum Supply Voltage RLOAD = 10k RLOAD = 10k FC1 = FC0 = GND, f = 7kHz Supply Current FC1 = GND, FC0 = IN, f = 33kHz FC1 = IN, FC0 = GND, f = 100kHz FC1 = FC0 = IN, f = 185kHz Shutdown Current FC1 = FC0 = IN or GND, SHDN = GND FC1 = FC0 = GND Oscillator Frequency FC1 = GND, FC0 = IN FC1 = IN, FC0 = GND FC1 = FC0 = IN INPUTS AND OUTPUTS Logic Input Low Voltage Logic Input High Voltage Logic Input Bias Current V+ to IN Shutdown Resistance V- to GND Shutdown Resistance Output Resistance (Note 1) SHDN, FC0, FC1 SHDN, FC0, FC1 SHDN, FC0 = FC1 = GND or IN IV+ = 10mA IV- = 10mA IV+ = 10mA, IV- = 0mA V+ = 10V, IV- = 10mA (forced) Voltage Conversion Efficiency V+, RL = V-, RL = TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 95 95 99 99 34 3.5 -1 22 6 55 2.2 2.8 1 100 50 75 100 50 60 % 1.0 V V A 5 24 70 130 0.6 2.4 7 12 0.1 7 33 100 185 TA = +25C TA = TMIN to TMAX 1.75 2.00 6.0 1.0 3.65 11 18 1 10 48 140 260 kHz A mA 1.25 V V SYMBOL MIN TYP MAX UNITS
Note 1: Measured using the capacitor values in Table 1. Capacitor ESR contributes approximately 10% of the output impedance [ESR + 1 / (pump frequency x capacitance)].
2
_______________________________________________________________________________________
Dual-Output Charge Pump with Shutdown
__________________________________________Typical Operating Characteristics
(VIN = 5.0V, capacitor values in Table 1, TA = +25C, unless otherwise noted.)
MAX864
EFFICIENCY vs. OUTPUT CURRENT @ 7kHz PUMP FREQUENCY
MAX864-01
EFFICIENCY vs. OUTPUT CURRENT @ 33kHz PUMP FREQUENCY
MAX864-02
EFFICIENCY vs. OUTPUT CURRENT @ 100kHz PUMP FREQUENCY
VIN = 3.3V V+ VIN = 5.0V V50 40 30 20 10 0 C1-C4 = 2.2F FC1 = 0, FC0 = 0 VV+ 70 EFFICIENCY V+, V- (%) 60
MAX864-03
100 90 EFFICIENCY V+, V- (%) 80 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 C1-C4 = 33F FC1 = 0, FC0 = 0 VIN = 3.3V VV+ VVIN = 5.0V V+
90 VIN = 3.3V 80 EFFICIENCY V+, V- (%) 70 60 50 40 30 20 10 0 C1-C4 = 6.8F FC1 = 0, FC0 = 1 VIN = 5.0V V+ VV+ V-
80
35
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT @ 185kHz PUMP FREQUENCY
MAX864-04
OUTPUT RESISTANCE vs. SUPPLY VOLTAGE
FC1 = 1, FC0 = 1 (185kHz @ 5V)
MAX864-05
OUTPUT RESISTANCE vs. TEMPERATURE
V-, VIN = 3.0V V-, VIN = 4.5V V+, VIN = 3.0V
MAX864-06
80 70 EFFICIENCY V+, V- (%) 60
VIN = 3.3V
160 140 120 ROUT100 80 60 40 ROUT+
140 125 OUTPUT RESISTANCE () 110 95 80 65 50 35 V+, VIN = 4.5V
V+
V+
VIN = 5.0V 50 40 30 20 10 0 0 5 10 15 20 C1-C4 = 1F FC1 = 1, FC0 = 1
V-
V-
OUTPUT RESISTANCE ()
25
30
35
1.0
2.0
3.0
4.0
5.0
6.0
-55 -35 -15
5
25
45
65
85 105 125
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX864-07
OUTPUT CURRENT vs. PUMP CAPACITANCE (VIN = 1.9V, V+ + V- = 6V)
MAX864-08
OUTPUT CURRENT vs. PUMP CAPACITANCE (VIN = 3.15V, V+ + V- = 10V)
OUTPUT CURRENT FROM V+ TO V- (mA) 8 7 6 5 4 3 2 1 0 0 5 C1 = C2 = C3 = C4 10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (F) f = 7kHz f = 100kHz f = 33kHz f = 185kHz
MAX864-09
10 8 6 OUTPUT VOLTAGE (V) 4 2 0 -2 -4 -6 -8 -10 0 5 10 15 20 25 30 35 V- LOADED V+ LOADED BOTH V+ AND V- LOADED EQUALLY C1-C4 = 1F VIN = 4.75V FC1 = 1 FC0 = 1 (185kHz) V+ LOADED V- LOADED
OUTPUT CURRENT FROM V+ TO V- (mA)
4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 5
f = 33kHz
9
f = 185kHz f = 7kHz
f = 100kHz
C1 = C2 = C3 = C4 10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (F)
40
OUTPUT CURRENT (mA)
_______________________________________________________________________________________
3
Dual-Output Charge Pump with Shutdown MAX864
____________________________Typical Operating Characteristics (continued)
(VIN = 5.0V, capacitor values in Table 1, TA = +25C, unless otherwise noted.)
OUTPUT CURRENT vs. PUMP CAPACITANCE (VIN = 4.75V, V+ + V- = 16V)
MAX864-10
OUTPUT VOLTAGE RIPPLE vs. PUMP CAPACITANCE (VIN = 1.9V, V+ + V- = 6V)
MAX864-11
OUTPUT VOLTAGE RIPPLE vs. PUMP CAPACITANCE (VIN = 3.15V, V+ + V- = 10V)
OUTPUT VOLTAGE RIPPLE (mVp-p) C1 = C2 = C3 = C4 OUTPUT RIPPLE IS MEASURED FOR THE LOAD CURRENT INDICATED IN THE "OUTPUT CURRENT vs. PUMP CAPACITANCE" 7kHz GRAPH AT VIN = 3.15V. 100kHz 33kHz 100 0 185kHz
MAX864-12 MAX864-18 MAX864-15
OUTPUT CURRENT FROM V+ TO V- (mA)
14 33kHz 12 10 100kHz 8 6 4 2 C1 = C2 = C3 = C4 0 0 5 7kHz 185kHz
400 OUTPUT VOLTAGE RIPPLE (mVp-p) C1 = C2 = C3 = C4 350 300 250 200 150 100 50 0 0 5 OUTPUT RIPPLE IS MEASURED FOR THE LOAD CURRENT INDICATED IN THE "OUTPUT CURRENT vs. PUMP CAPACITANCE" GRAPH AT VIN = 1.9V. 33kHz 100kHz 185kHz
600 500 400 300 200
7kHz
10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (F)
10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (F)
0
5
10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (F)
OUTPUT VOLTAGE RIPPLE vs. PUMP CAPACITANCE (VIN = 4.75V, V+ + V- = 16V)
MAX864-13
SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX864-14
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
3.0 SHUTDOWN SUPPLY CURRENT (A) 2.5 2.0 1.5 1.0 VIN = 5.0V 0.5 VIN = 3.3V 0
800 OUTPUT VOLTAGE RIPPLE (mVp-p) 700 600 500 400 300 200 100 0 0 5 33kHz C1 = C2 = C3 = C4 OUTPUT RIPPLE IS MEASURED FOR THE LOAD CURRENT INDICATED IN THE "OUTPUT CURRENT vs. PUMP CAPACITANCE" GRAPH AT VIN = 4.75V. 7kHz 100kHz 185kHz
600 SHUTDOWN SUPPLY CURRENT (nA) 500 400 300 200 100 0
10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (F)
1.0
2.0
3.0
4.0
5.0
6.0
-55 -35 -15
5
25
45
65
85 105 125
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
SUPPLY CURRENT vs. TEMPERATURE (VIN = 3.3V)
MAX864-16
SUPPLY CURRENT vs. TEMPERATURE (VIN = 5V)
MAX864-17
PUMP FREQUENCY vs. TEMPERATURE
200 180 PUMP FREQUENCY (kHz) 160 140 120 100 80 60 40 20 0 FC1 = 0, FC0 = 1 FC1 = 0, FC0 = 0 -55 -35 -15 5 25 45 65 85 105 125 FC1 = 1, FC0 = 0 FC1 = 1, FC0 = 1
7 6 SUPPLY CURRENT (mA) 5 4 FC1 = 1, FC0 = 0 3 2 FC1 = 0, FC0 = 1 1 FC1 = 0, FC0 = 0 0 -55 -35 -15 5 25 45 65 FC1 = 1, FC0 = 1
14 12 SUPPLY CURRENT (mA) 10 8 6 4 FC1 = 0, FC0 = 1 2 0 FC1 = 0, FC0 = 0 -55 -35 -15 5 25 45 65 FC1 = 1, FC0 = 0 FC1 = 1, FC0 = 1
85 105 125
85 105 125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
4
_______________________________________________________________________________________
Dual-Output Charge Pump with Shutdown
____________________________Typical Operating Characteristics (continued)
(VIN = 5.0V, capacitor values in Table 1, TA = +25C, unless otherwise noted.)
MAX864
TIME TO EXIT SHUTDOWN
MAX864-19
+5V 0V +10V FC0 = FC1 = GND (7kHz), C1-C4 = 33F 0V FC0 = FC1 = IN (185kHz), C1-C4 = 1F
-10V 1ms/div
_____________________Pin Description
PIN NAME C1C2+ GND C2VFUNCTION Negative Terminal of the Flying Boost Capacitor Positive Terminal of the Flying Inverting Capacitor Ground (connect pins 3 and 11 together) Negative Terminal of the Flying Inverting Capacitor Output of the Inverting Charge Pump Active-Low Shutdown Input. With SHDN low, the part is in shutdown mode and its supply current is less than 1A. In shutdown mode, V+ connects to IN through a 22 switch, and V- connects to GND through a 6 switch. Frequency Select, MSB (see Table 1) Frequency Select, LSB (see Table 1) No Connect--no internal connection. Connect these to ground to improve thermal dissipation. Positive Power-Supply Input Output of the Boost Charge Pump Positive Terminal of the Flying Boost Capacitor
C2 C1 1 C12 C2+ 3 GND 4 C25 V6 SHDN 7 FC1 8 FC0
1
2 3, 11 4 5
VCC IN
MAX864
C1+ 16 15 V+ N.C. 14 N.C. 13
V+ OUT C3 IL+ RL+
6
SHDN
+5V
7 8 9, 10, 13, 14 12 15 16
FC1 FC0 N.C. IN V+ C1+
IN 12 11 GND 10 N.C. 9 N.C. C4
RLILV- OUT
SEE TABLE 1 FOR CAPACITOR VALUES.
Figure 1. Test Circuit
_______________________________________________________________________________________
5
Dual-Output Charge Pump with Shutdown MAX864
_______________Detailed Description
The MAX864 requires only four external capacitors to implement a voltage doubler/inverter. These may be ceramic or polarized capacitors (electrolytic or tantalum) with values ranging from 0.47F to 100F. Figure 2a illustrates the ideal operation of the positive voltage doubler. The on-chip oscillator generates a 50% duty-cycle clock signal. During the first half cycle, switches S2 and S4 open, switches S1 and S3 close, and capacitor C1 charges to the input voltage (V IN). During the second half cycle, switches S1 and S3 open, switches S2 and S4 close, and capacitor C1 is level shifted upward by V IN volts. Assuming ideal switches and no load on C3, charge transfers into C3 from C1 such that the voltage on C3 will be 2VIN , generating the positive supply output (V+). Figure 2b illustrates the ideal operation of the negative converter. The switches of the negative converter are out of phase from the positive converter. During the second half cycle, switches S6 and S8 open, and switches S5 and S7 close, charging C2 from V+ (pumped up to 2VIN by the positive charge pump) to GND. In the first half of the clock cycle, switches S5 and S7 open, switches S6 and S8 close, and the charge on capacitor C2 transfers to C4, generating the negative supply. The eight switches are CMOS power MOSFETs. Switches S1, S2, S4, and S5 are P-channel devices, while switches S3, S6, S7, and S8 are N-channel devices.
Charge-Pump Frequency and Capacitor Selection
The MAX864 offers four different charge-pump frequencies. To select a desired frequency, define pins FC0 and FC1 as shown in Table 1. Lower charge-pump frequencies produce lower average supply currents, while higher charge-pump frequencies require smaller capacitors. Table 1 also lists the recommended charge-pump capacitor values for each pump frequency. Using values larger than those recommended will have little effect on the output current. Using values smaller than those recommended will reduce the available output current and increase the output ripple. To cut the output ripple in half, double the values of C3 and C4. To maintain the lowest output resistance, use capacitors with low effective series resistance (ESR). At each switching frequency, the charge-pump output resistance is a function of C1, C2, C3, and C4's ESR. Minimizing the charge-pump capacitors' ESR minimizes output resistance. Use ceramic capacitors for best results.
Table 1. Frequency Selection
FC1 0 0 1 1 FC0 0 1 0 1 FREQUENCY (kHz) 7 33 100 185 CAPACITORS C1-C4 (F) 33 6.8 2.2 1
a)
V+ S1 IN C1 C3 C1+ S2
b)
V+ S5 C2+ S6 GND IL+ RL+ C2 ILC4 S3 GND C1S4 IN GND C2S7 S8 VRL-
Figure 2. Idealized Voltage Quadrupler: a) Positive Charge Pump; b) Negative Charge Pump
6 _______________________________________________________________________________________
Dual-Output Charge Pump with Shutdown
Charge-Pump Output
The MAX864 is not a voltage regulator: the output source resistance of either charge pump is approximately 55 at room temperature (with VIN = 5V); and V+ and V- approach +10V and -10V, respectively, when lightly loaded. Both V+ and V- will droop toward GND as the current draw from either V+ or V- increases, since Vis derived from V+. Treating each converter separately, the droop of the negative supply (VDROOP-) is the product of the current draw from V- (IV-) and the source resistance of the negative converter (RS-): VDROOP- = I V - x RS The droop of the positive supply (V DROOP+ ) is the product of the current draw from the positive supply (ILOAD+) and the source resistance of the positive converter (RS+), where ILOAD+ is the combination of IVand the external load on V+ (IV+): VDROOP+ = ILOAD+ x RS+ = I V+ + I V - x RS+ Determine V+ and V- as follows: V+ = 2VIN - VDROOP+ V - = (V+ - VDROOP ) = -(2VIN - VDROOP+ - VDROOP- ) The output resistances for the positive and negative charge pumps are tested and specified separately. The positive charge pump is tested with V- unloaded. The negative charge pump is tested with V+ supplied from an external source, isolating the negative charge pump. Current draw from either V+ or V- is supplied by the reservoir capacitor alone during one half cycle of the clock. Calculate the resulting ripple voltage on either output as follows: VRIPPLE =
1 2
Shutdown
The MAX864 features a shutdown mode that reduces the maximum supply current to 1A over temperature. The SHDN pin is an active-low TTL logic-level input. If the shutdown feature is unused, connect SHDN to IN. In shutdown mode, V+ connects to IN through a 22 switch and V- connects to GND through a 6 switch.
MAX864
_________Efficiency Considerations
Theoretically, a charge-pump voltage multiplier can approach 100% efficiency under the following conditions: * The charge-pump switches have virtually no offset, and extremely low on-resistance. * The drive circuitry consumes minimal power. * The impedances of the reservoir and pump capacitors are negligible. For the MAX864, the energy loss per clock cycle is the sum of the energy loss in the positive and negative converters, as follows: LOSSCYCLE = LOSSPOS + LOSSNEG 1 2 = C1 V + - 2 V + VIN 2 1 2 2 + C2 V + - V - 2 where V+ and V- are the actual measured output voltages. The average power loss is simply:
(
)
()
( )( ) ()
()
Resulting in an efficiency of: PLOSS = LOSSCYCLE x fPUMP
= Total Output Power / Total Output Power - PLOSS
ILOAD (1 / fPUMP ) (1 / CRESERVOIR )
(
)
where ILOAD is the load on either V+ or V-. For example, with an fPUMP of 33kHz and 6.8F reservoir capacitors, the ripple is 26mV when I LOAD is 12mA. Remember that, in most applications, the total load on V+ is the V+ load current (IV+) and the current taken by the negative charge pump (IV-).
There will be a substantial voltage difference between (V+ - VIN) and VIN for the positive pump, and between V+ and V- if the impedances of the pump capacitors (C1 and C2) are large with respect to their respective output loads. Larger reservoir capacitor (C3 and C4) values will reduce output ripple. Larger values of both pump and reservoir capacitors will improve efficiency.
_______________________________________________________________________________________
7
Dual-Output Charge Pump with Shutdown MAX864
__________Applications Information
Positive and Negative Converter
The most common application of the MAX864 is as a dual charge-pump voltage converter that provides positive and negative outputs of two times a positive input voltage for biasing analog circuitry (Figure 3). Select a charge-pump frequency high enough so it does not interfere with other circuitry, but low enough to maintain low supply current. See Table 1 for the correct device configuration.
Paralleling Devices
Paralleling multiple MAX864s reduces the output resistance of both the positive and negative converters (Figure 4). The effective output resistance is the output resistance of one device divided by the total number of devices. Separate C1 and C2 charge-pump capacitors are required for each MAX864, but the reservoir capacitors C3 and C4 can be shared.
VIN (+1.75V TO +6.0V)
C1
C2
1 C12 C2+ 3 GND 4 C25 V6 SHDN 7 FC1 8 FC0
MAX864
C1+ 16 15 V+ 14 N.C. 13 N.C. IN 12 11 GND 10 N.C. 9 N.C.
+2 x VIN C3
IN SEE TABLE 1
C4
-2 x VIN
Figure 3. Positive and Negative Converter
8
_______________________________________________________________________________________
Dual-Output Charge Pump with Shutdown MAX864
VIN
3.3F 1 2 3.3F 3 4 C1C2+ MAX864 C2VV+ C1+ IN GND 8 7 6 5
3.3F 1 2 3.3F 3 4 C1C2+ MAX864 C2VV+ C1+ IN GND 8 7 6 5 3.3F VIN GND V+ OUT
3.3F
V- OUT
Figure 4. Paralleling Two MAX864s
Heavy Output Current Loads
When under heavy loads, where V+ is sourcing current into V- (i.e., load current flows from V+ to V-, rather than from supply to ground), do not allow the V- supply to pull above ground. In applications where large currents flow from V+ to V-, use a Schottky diode (1N5817) between GND and V-, with the anode connected to GND (Figure 5).
GND
11
Layout and Grounding
Good layout is important, primarily for good noise performance. To ensure good layout, mount all components as close together as possible, keep traces short to minimize parasitic inductance and capacitance, and use a ground plane. Connecting all N.C. pins to a ground plane improves thermal dissipation.
MAX864
5
V-
Figure 5. High V- Load Circuit
_______________________________________________________________________________________ 9
Dual-Output Charge Pump with Shutdown MAX864
___________________Chip Topography
C2+
C1-
C1+
V+
GND
0.120" (3.05mm)
C2VIN SHDN GND
FC1
FC0 0.080" (2.03mm)
TRANSISTOR COUNT: 143 SUBSTRATE CONNECTED TO V+
10
______________________________________________________________________________________
Dual-Output Charge Pump with Shutdown
________________________________________________________Package Information
DIM INCHES MILLIMETERS MAX MIN MIN MAX 0.068 0.061 1.55 1.73 0.004 0.0098 0.127 0.25 0.061 0.055 1.40 1.55 0.012 0.008 0.20 0.31 0.0075 0.0098 0.19 0.25 SEE VARIATIONS 0.157 0.150 3.81 3.99 0.25 BSC 0.635 BSC 0.244 0.230 5.84 6.20 0.016 0.010 0.25 0.41 0.035 0.016 0.41 0.89 SEE VARIATIONS SEE VARIATIONS 8 0 0 8 DIM PINS D S D S D S D S 16 16 20 20 24 24 28 28 INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.196 4.80 4.98 0.0020 0.0070 0.05 0.18 0.337 0.344 8.56 8.74 0.0500 0.0550 1.27 1.40 0.337 0.344 8.56 8.74 0.0250 0.0300 0.64 0.76 0.386 0.393 9.80 9.98 0.0250 0.0300 0.64 0.76
21-0055A
MAX864
D A e B
A1
S
A A1 A2 B C D E e H h L N S
E
H h x 45 A2
N E C L
QSOP QUARTER SMALL-OUTLINE PACKAGE
______________________________________________________________________________________
11
Dual-Output Charge Pump with Shutdown MAX864
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.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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