_______________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, capac-
itor size, and switching frequency to be optimized. The
55Ωoutput impedance permits useful output currents
up to 20mA. The MAX864 also has a 1µA logic-con-
trolled 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 µMAX package, which uses half
the board area of the MAX864.
________________________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
____________________________Features
♦Requires Only Four Capacitors
♦Dual Outputs (Positive and Negative)
♦Low Input Voltages: +1.75V to +6.0V
♦1µA Logic-Controlled Shutdown
♦Selectable Frequencies Allow Optimization
of Capacitor Size and Supply Current
MAX864
Dual-Output Charge Pump with Shutdown
________________________________________________________________
Maxim Integrated Products
1
MAX864
C1+
IN V+
V-
SHDNFC1 GNDFC0
C1-
C2+
VIN VIN VIN
C2-
+2VIN
VIN
(+1.75V TO +6.0V)
-2VIN
__________________Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
C1+
V+
N.C.
N.C.
IN
GND
N.C.
N.C.
C1-
C2+
GND
C2-
V-
SHDN
FC1
FC0
TOP VIEW
MAX864
QSOP
__________Typical Operating Circuit
19-0478; Rev 0; 3/96
PART
MAX864C/D
MAX864EEE -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
Dice*
16 QSOP
______________Ordering Information
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
*
Contact factory for dice specifications.
MAX864
Dual-Output Charge Pump with Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS (Note 1)
(VIN = 5V, SHDN = VIN, circuit of Figure 1, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
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.
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)].
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......................................................-40°C to +85°C
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.70mW/°C above +70°C).....................696mW
Storage Temperature Range............................ -65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Ω
60
V+ = 10V, IV- = 10mA (forced)
Output Resistance
(Note 1) 34 50
100
IV+ = 10mA, IV- = 0mA 55 75 Ω650I
V- = 10mAV- to GND Shutdown Resistance Ω22 100IV+ = 10mAV+ to IN Shutdown Resistance µA-1 1
SHDN, FC0 = FC1 = GND or IN
Logic Input Bias Current V3.5 2.8
SHDN, FC0, FC1
Logic Input High Voltage V2.2 1.0
SHDN, FC0, FC1
Logic Input Low Voltage
kHz
130 185 260FC1 = FC0 = IN
Oscillator Frequency
V6.0RLOAD = 10kΩMaximum Supply Voltage
V
2.00
Minimum Start-Up Voltage
70 100 140FC1 = IN, FC0 = GND 24 33 48FC1 = GND, FC0 = IN 5710FC1 = FC0 = GND µA0.1 1
FC1 = FC0 = IN or GND, SHDN = GND
Shutdown Current
0.6 1.0FC1 = FC0 = GND, f = 7kHz 2.4 3.65FC1 = GND, FC0 = IN, f = 33kHz 711FC1 = IN, FC0 = GND, f = 100kHz mA
12 18FC1 = FC0 = IN, f = 185kHz
Supply Current
UNITSMIN TYP MAXSYMBOLPARAMETER
RLOAD = 10kΩ
%
95 99
V-, RL= ∞
Voltage Conversion Efficiency 95 99
V+, RL= ∞
TA= TMIN to TMAX
TA= +25°C
TA= +25°C
TA= TMIN to TMAX
SUPPLY
INPUTS AND OUTPUTS
TA= +25°C
TA= TMIN to TMAX
1.75 1.25
__________________________________________Typical Operating Characteristics
(VIN = 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
10
-10 0510 20 25 40
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
-8
6
8
MAX864-07
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
15 30 35
-2
4
2
0
-4
-6
V- LOADED
C1–C4 = 1µF
VIN = 4.75V
FC1 = 1
FC0 = 1 (185kHz)
V- LOADED
V+ LOADED
V+ LOADED
BOTH V+ AND
V- LOADED EQUALLY
100
001052035
EFFICIENCY vs. OUTPUT CURRENT
@ 7kHz PUMP FREQUENCY
20
80 V+
V- V-
90
MAX864-01
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
VIN = 5.0V
VIN = 3.3V
C1–C4 = 33µF
FC1 = 0, FC0 = 0
V+
001052035
EFFICIENCY vs. OUTPUT CURRENT
@ 33kHz PUMP FREQUENCY
20
80 V+
V- V-
90
MAX864-02
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
VIN = 5.0V
VIN = 3.3V
V+
C1–C4 = 6.8µF
FC1 = 0, FC0 = 1
001052035
EFFICIENCY vs. OUTPUT CURRENT
@ 100kHz PUMP FREQUENCY
20
80 V+
V- V-
MAX864-03
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
VIN = 5.0V
V+
VIN = 3.3V
C1–C4 = 2.2µF
FC1 = 0, FC0 = 0
001052035
EFFICIENCY vs. OUTPUT CURRENT
@ 185kHz PUMP FREQUENCY
20
80 V+
V-
V-
MAX864-04
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (%)
15 25 30
70
40
60
50
30
10
VIN = 5.0V
V+
VIN = 3.3V
C1–C4 = 1µF
FC1 = 1, FC0 = 1
160
40 1.0 2.0 4.0 6.0
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
60
140
MAX864-05
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (Ω)
3.0 5.0
100
120
80
ROUT-
FC1 = 1, FC0 = 1
(185kHz @ 5V)
ROUT+
140
35 -55 -35 -15 45 65 125
OUTPUT RESISTANCE
vs. TEMPERATURE
50
125
MAX864-06
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
5 25 85 105
80
110
95
65
V-, VIN = 3.0V
V-, VIN = 4.5V
V+, VIN = 3.0V
V+, VIN = 4.5V
4.5
00 5 10 15 3025 35 50
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
0.5
3.5
4.0
MAX864-08
PUMP CAPACITANCE (µF)
OUTPUT CURRENT FROM V+ TO V- (mA)
20 40 45
2.0
3.0
2.5
1.5
1.0
f = 7kHz
C1 = C2 = C3 = C4
f = 33kHz
f = 185kHz f = 100kHz
9
00 5 10 15 3025 35 50
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 3.15V, V+ + V- = 10V)
1
7
8
MAX864-09
PUMP CAPACITANCE (µF)
OUTPUT CURRENT FROM V+ TO V- (mA)
20 40 45
4
6
5
3
2
C1 = C2 = C3 = C4
f = 185kHz
f = 7kHz
f = 33kHz
f = 100kHz
MAX864
Dual-Output Charge Pump with Shutdown
_______________________________________________________________________________________
3
MAX864
Dual-Output Charge Pump with Shutdown
4 _______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(VIN = 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
14
00 5 10 15 3025 35 50
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 4.75V, V+ + V- = 16V)
2
12
MAX864-10
PUMP CAPACITANCE (µF)
OUTPUT CURRENT FROM V+ TO V- (mA)
20 40 45
6
10
8
4
185kHz
100kHz
7kHz
33kHz
C1 = C2 = C3 = C4
400
00 5 10 15 3025 35 50
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
50
350
MAX864-11
PUMP CAPACITANCE (µF)
OUTPUT VOLTAGE RIPPLE (mVp-p)
20 40 45
200
150
300
250
100 7kHz
33kHz
100kHz
185kHz
C1 = C2 = C3 = C4
OUTPUT RIPPLE IS
MEASURED FOR THE
LOAD CURRENT INDICATED
IN THE "OUTPUT CURRENT
vs. PUMP CAPACITANCE"
GRAPH AT VIN = 1.9V.
600
00 5 10 15 3025 35 50
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 3.15V, V+ + V- = 10V)
500
MAX864-12
PUMP CAPACITANCE (µF)
OUTPUT VOLTAGE RIPPLE (mVp-p)
20 40 45
300
200
400
100
7kHz
33kHz
100kHz 185kHz
C1 = C2 = C3 = C4
OUTPUT RIPPLE IS
MEASURED FOR THE
LOAD CURRENT INDICATED
IN THE "OUTPUT CURRENT
vs. PUMP CAPACITANCE"
GRAPH AT VIN = 3.15V.
800
00 5 10 15 3025 35 50
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 4.75V, V+ + V- = 16V)
700
MAX864-13
PUMP CAPACITANCE (µF)
OUTPUT VOLTAGE RIPPLE (mVp-p)
20 40 45
400
300
200
600
500
100
7kHz
100kHz
33kHz 185kHz
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.
600
01.0 2.0 4.0 6.0
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
500
MAX864-14
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (nA)
3.0 5.0
300
200
400
100
3.0
0-55 -15-35 6545 85 125
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
2.5
MAX864-15
TEMPERATURE
(
°C
)
SHUTDOWN SUPPLY CURRENT (µA)
255 105
1.5
1.0
2.0
0.5 VIN = 5.0V
VIN = 3.3V
7
0-55 -15-35 6545 85 125
SUPPLY CURRENT vs. TEMPERATURE
(VIN = 3.3V)
6
MAX864-16
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
255 105
3
2
5
4
1
FC1 = 1, FC0 = 1
FC1 = 1, FC0 = 0
FC1 = 0, FC0 = 1
FC1 = 0, FC0 = 0
14
0-55 -15-35 6545 85 125
SUPPLY CURRENT vs. TEMPERATURE
(VIN = 5V)
12
MAX864-17
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
255 105
6
4
10
8
2
FC1 = 1, FC0 = 1
FC1 = 1, FC0 = 0
FC1 = 0, FC0 = 1
FC1 = 0, FC0 = 0
200
0-55 -15-35 6545 85 125
PUMP FREQUENCY
vs. TEMPERATURE
180
MAX864-18
TEMPERATURE
(
°C
)
PUMP FREQUENCY (kHz)
255 105
100
80
60
160
140
120
20
40
FC1 = 1, FC0 = 1
FC1 = 1, FC0 = 0
FC1 = 0, FC0 = 1
FC1 = 0, FC0 = 0
MAX864
Dual-Output Charge Pump with Shutdown
_______________________________________________________________________________________ 5
____________________________Typical Operating Characteristics (continued)
(VIN = 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
TIME TO EXIT SHUTDOWN
+5V
0V
+10V
0V
-10V
MAX864-19
1ms/div
FC0 = FC1 = IN (185kHz), C1–C4 = 1µF
FC0 = FC1 = GND (7kHz), C1–C4 = 33µF
_____________________Pin Description
No Connect—no internal connection.
Connect these to ground to improve
thermal dissipation.
N.C.
9, 10,
13, 14
Positive Power-Supply Input IN12
Output of the Boost Charge PumpV+15
Positive Terminal of the Flying Boost
Capacitor
C1+16
Output of the Inverting Charge PumpV-5
Active-Low Shutdown Input. With
SHDN low, the part is in shutdown
mode and its supply current is less
than 1µA. In shutdown mode, V+
connects to IN through a 22Ωswitch,
and V- connects to GND through a
6Ωswitch.
SHDN
6
Frequency Select, MSB (see Table 1)FC17
Frequency Select, LSB (see Table 1)FC08
Negative Terminal of the Flying
Inverting Capacitor
C2-4
Ground (connect pins 3 and 11 together)GND3, 11
PIN
Positive Terminal of the Flying
Inverting Capacitor
C2+2
Negative Terminal of the Flying Boost
Capacitor
C1-
1
FUNCTIONNAME
MAX864
C1+
1
2
3
4
5
6
7
8
C1- 16
15
14
13
12
11
10
9
C2
+5V
C1
C3
C4
VCC IN
C2+
C2-
GND
V-
SHDN
FC0
FC1
V+ OUT
V- OUT
SEE TABLE 1 FOR CAPACITOR VALUES.
RL-
RL+
IL+
V+
N.C.
N.C.
IN
GND
N.C.
N.C.
IL-
Figure 1. Test Circuit
MAX864
Dual-Output Charge Pump with Shutdown
6 _______________________________________________________________________________________
_______________Detailed Description
The MAX864 requires only four external capacitors to
implement a voltage doubler/inverter. These may be
ceramic or polarized capacitors (electrolytic or tanta-
lum) with values ranging from 0.47µF to 100µF.
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 (VIN).
During the second half cycle, switches S1 and S3
open, switches S2 and S4 close, and capacitor C1 is
level shifted upward by VIN volts. Assuming ideal
switches and no load on C3, charge transfers into C3
from C1 such that the voltage on C3 will be 2VIN , gen-
erating 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-chan-
nel devices.
Charge-Pump Frequency
and Capacitor Selection
The MAX864 offers four different charge-pump frequen-
cies. To select a desired frequency, define pins FC0 and
FC1 as shown in Table 1. Lower charge-pump frequen-
cies produce lower average supply currents, while high-
er charge-pump frequencies require smaller capacitors.
Table 1 also lists the recommended charge-pump
capacitor values for each pump frequency. Using val-
ues 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 out-
put 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 switch-
ing 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 resis-
tance. Use ceramic capacitors for best results.
Table 1. Frequency Selection
1
2.2
6.8
33
CAPACITORS
C1–C4
(µF)
185
100
33
7
11
FREQUENCY
(kHz)
01
FC1
10 00
FC0
IN
a) b)
S1
S3
C1+
C1 C3
C1-
S2
S4
S5 S6
S7 S8
C2-
GND
V-
RL-
RL+
C2+
C4
C2
GND
IN
IL-
V+
GND
IL+
V+
Figure 2. Idealized Voltage Quadrupler: a) Positive Charge Pump; b) Negative Charge Pump
MAX864
Dual-Output Charge Pump with Shutdown
_______________________________________________________________________________________ 7
Charge-Pump Output
The MAX864 is not a voltage regulator: the output
source resistance of either charge pump is approxi-
mately 55Ωat 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 V-
is derived from V+. Treating each converter separately,
the droop of the negative supply (VDROOP-) is the prod-
uct of the current draw from V- (IV-) and the source
resistance of the negative converter (RS-):
The droop of the positive supply (VDROOP+) is the
product of the current draw from the positive supply
(ILOAD+) and the source resistance of the positive con-
verter (RS+), where ILOAD+ is the combination of IV-
and the external load on V+ (IV+):
Determine V+ and V- as follows:
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:
where ILOAD is the load on either V+ or V-. For exam-
ple, with an fPUMP of 33kHz and 6.8µF reservoir capaci-
tors, the ripple is 26mV when ILOAD 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-).
Shutdown
The MAX864 features a shutdown mode that reduces
the maximum supply current to 1µA 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 22Ω
switch and V- connects to GND through a 6Ωswitch.
_________Efficiency Considerations
Theoretically, a charge-pump voltage multiplier can
approach 100% efficiency under the following condi-
tions:
•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 capaci-
tors 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:
where V+ and V- are the actual measured output volt-
ages.
The average power loss is simply:
Resulting in an efficiency of:
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.
V = I x RS-
DROOP- V-
V = I x RS+= I + I x RS+
DROOP+ LOAD+ V+ V-
()
V+ = 2V - V
V- = (V+ - V )
=-(2V - V - V )
IN DROOP+
DROOP
IN DROOP+ DROOP-
V = I (1 / f ) (1 / C )
RIPPLE 1
2LOAD PUMP RESERVOIR
LOSS = LOSS + LOSS
= C1
CYCLE POS NEG
1
21
2
VVV
CV V
IN
+
()
−+
()()
++
()
−−
()
2
22
2
2
P = LOSS x f
LOSS CYCLE PUMP
η= −
()
Total Output Power Total Output Power PLOSS
/
MAX864
Dual-Output Charge Pump with Shutdown
8 _______________________________________________________________________________________
__________Applications Information
Positive and Negative Converter
The most common application of the MAX864 is as a
dual charge-pump voltage converter that provides pos-
itive 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 resis-
tance 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 capac-
itors C3 and C4 can be shared.
MAX864
C1+
1
2
3
4
5
6
7
8
C1- 16
15
14
13
12
11
10
9
C2
IN
SEE TABLE 1
C1
C3
C4
VIN
(+1.75V TO +6.0V)
C2+
C2-
GND
V-
SHDN
FC0
FC1
+2 x VIN
-2 x VIN
V+
N.C.
N.C.
IN
GND
N.C.
N.C.
Figure 3. Positive and Negative Converter
MAX864
Dual-Output Charge Pump with Shutdown
_______________________________________________________________________________________ 9
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).
Layout and Grounding
Good layout is important, primarily for good noise per-
formance. To ensure good layout, mount all compo-
nents 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
V+
1
2
3
4
C1-
GND
3.3µF
3.3µF
3.3µF
3.3µF
3.3µF 3.3µF
V+ OUT
VIN
V- OUT
8
7
6
5
C2+
C2-
V-
C1+
IN
GND
MAX864
V+
1
2
3
4
C1- 8
7
6
5
C2+
C2-
VIN
V-
C1+
IN
GND
Figure 4. Paralleling Two MAX864s
MAX864
GND 11
5
V-
Figure 5. High V- Load Circuit
MAX864
Dual-Output Charge Pump with Shutdown
10 ______________________________________________________________________________________
___________________Chip Topography
TRANSISTOR COUNT: 143
SUBSTRATE CONNECTED TO V+
C2+
FC1
0.120"
(3.05mm)
0.080"
(2.03mm)
IN
GND
GND
C1- C1+ V+
C2-
V-
SHDN
FC0
MAX864
Dual-Output Charge Pump with Shutdown
______________________________________________________________________________________ 11
________________________________________________________Package Information
DIM
A
A1
A2
B
C
D
E
e
H
h
L
N
S
α
MIN
0.061
0.004
0.055
0.008
0.0075
0.150
0.230
0.010
0.016
0°
MAX
0.068
0.0098
0.061
0.012
0.0098
0.157
0.244
0.016
0.035
8°
MIN
1.55
0.127
1.40
0.20
0.19
3.81
5.84
0.25
0.41
0°
MAX
1.73
0.25
1.55
0.31
0.25
3.99
6.20
0.41
0.89
8°
INCHES MILLIMETERS
21-0055A
QSOP
QUARTER
SMALL-OUTLINE
PACKAGE
DIM
D
S
D
S
D
S
D
S
MIN
0.189
0.0020
0.337
0.0500
0.337
0.0250
0.386
0.0250
MAX
0.196
0.0070
0.344
0.0550
0.344
0.0300
0.393
0.0300
MIN
4.80
0.05
8.56
1.27
8.56
0.64
9.80
0.64
MAX
4.98
0.18
8.74
1.40
8.74
0.76
9.98
0.76
INCHES MILLIMETERS
PINS
16
16
20
20
24
24
28
28
L
α
H
A2
E
E
D
e
A
A1
C
B
S
N
h x 45°
SEE VARIATIONS
SEE VARIATIONS
SEE VARIATIONS
0.635 BSC0.25 BSC
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
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
MAX864
Dual-Output Charge Pump with Shutdown
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
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
