MAX864EEE+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX864EEE+
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, 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
____________________________FeatureRequires Only Four CapacitorsDual Outputs (Positive and Negative)Low Input Voltages: +1.75V to +6.0V1μA Logic-Controlled ShutdownSelectable Frequencies Allow Optimization
of Capacitor Size and Supply Current
Dual-Output Charge Pump with Shutdow
MAX864
C1+V+
SHDNFC1GNDFC0
C1-
C2+
VINVINVIN
C2-
+2VINVIN
(+1.75V TO +6.0V)
-2VIN
__________________Pin Configuration
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. RANGEPIN-PACKAGE
Dice*
16 QSOP
______________Ordering InformationContact factory for dice specifications.
Dual-Output Charge Pump with Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS (Note 1)
(VIN= 5V, SHDN= VIN, circuit of Figure 1, TA= TMINto 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°CV+ = 10V, IV-= 10mA (forced)
Output Resistance
(Note 1)3450
100IV+= 10mA, IV-= 0mA5575650IV-= 10mAV- to GND Shutdown Resistance22100IV+= 10mAV+ to IN Shutdown Resistance-11SHDN, FC0 = FC1 = GND or INLogic Input Bias Current3.52.8SHDN, FC0, FC1Logic Input High Voltage2.21.0SHDN, FC0, FC1Logic Input Low Voltage
kHz
130185260FC1 = FC0 = IN
Oscillator Frequency6.0RLOAD= 10kΩMaximum Supply Voltage2.00Minimum Start-Up Voltage100140FC1 = IN, FC0 = GND3348FC1 = GND, FC0 = IN710FC1 = FC0 = GND 0.11FC1 = FC0 = IN or GND, SHDN= GNDShutdown Current
0.61.0FC1 = FC0 = GND, f = 7kHz
2.43.65FC1 = GND, FC0 = IN, f = 33kHz11FC1 = IN, FC0 = GND, f = 100kHzmA18FC1 = FC0 = IN, f = 185kHz
Supply Current
UNITSMINTYPMAXSYMBOLPARAMETER
RLOAD= 10kΩ9599V-, RL= ¥Voltage Conversion Efficiency9599V+, RL= ¥= TMINto TMAX= +25°C= +25°C= TMINto TMAX
SUPPLY
INPUTS AND OUTPUTS= +25°C= TMINto TMAX
1.751.25
__________________________________________Typical Operating Characteristic
(VIN= 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
AX864-07
OUTPUT CURRENT (mA)
(V3035
V- LOADED
C1–C4 = 1mF
VIN = 4.75V
FC1 = 1
FC0 = 1 (185kHz)
V- LOADED
V+ LOADED
V+ LOADED
BOTH V+ AND
V- LOADED EQUALLY
1001052035EFFICIENCY vs. OUTPUT CURRENT
@ 7kHz PUMP FREQUENCYV+
AX864-01
OUTPUT CURRENT (mA)
, V
- (%2530
VIN = 5.0V
VIN = 3.3V
C1–C4 = 33mF
FC1 = 0, FC0 = 01052035
EFFICIENCY vs. OUTPUT CURRENT
@ 33kHz PUMP FREQUENCY
AX864-02
OUTPUT CURRENT (mA)
, V
- (%2530
VIN = 5.0V
VIN = 3.3V
C1–C4 = 6.8mF
FC1 = 0, FC0 = 11052035
EFFICIENCY vs. OUTPUT CURRENT
@ 100kHz PUMP FREQUENCYV+V-
AX864-03
OUTPUT CURRENT (mA)
, V
- (%2530
VIN = 5.0V
VIN = 3.3V
C1–C4 = 2.2mF
FC1 = 0, FC0 = 01052035
EFFICIENCY vs. OUTPUT CURRENT
@ 185kHz PUMP FREQUENCYV-
AX864-04
OUTPUT CURRENT (mA)
, V
- (%2530
VIN = 5.0VVIN = 3.3V
C1–C4 = 1mF
FC1 = 1, FC0 = 1
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
AX864-05
SUPPLY VOLTAGE (V)
(W
ROUT-
FC1 = 1, FC0 = 1
(185kHz @ 5V)
ROUT+
OUTPUT RESISTANCE
vs. TEMPERATURE
AX864-06
TEMPERATURE (°C)
(W2585105
V-, VIN = 3.0V
V-, VIN = 4.5V
V+, VIN = 3.0V
V+, VIN = 4.5V
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
MAX864-08
PUMP CAPACITANCE (μF)
- (m4045
f = 7kHz
C1 = C2 = C3 = C4
f = 33kHz
f = 185kHzf = 100kHz5101530253550
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 3.15V, V+ + V- = 10V)
MAX864-09
PUMP CAPACITANCE (μF)
- (m4045
C1 = C2 = C3 = C4
f = 185kHz
f = 7kHz
f = 33kHz
f = 100kHz
Dual-Output Charge Pump with Shutdow
Dual-Output Charge Pump with Shutdown
____________________________Typical Operating Characteristics (continued)
(VIN= 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)5101530253550
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 4.75V, V+ + V- = 16V)
AX864-10
PUMP CAPACITANCE (μF)
- (m4045
185kHz100kHz
7kHz
33kHz
C1 = C2 = C3 = C4
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
AX864-11
PUMP CAPACITANCE (μF)
(m4045
1007kHz
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.
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 3.15V, V+ + V- = 10V)
MAX864-12
PUMP CAPACITANCE (μF)
(m4045
7kHz
33kHz
100kHz185kHz
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.
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 4.75V, V+ + V- = 16V)
AX864-13
PUMP CAPACITANCE (μF)
(m4045
7kHz
100kHz
33kHz185kHz
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.
1.02.04.06.0
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX864-14
SUPPLY VOLTAGE (V)
(n
-55-15-35654585125
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
AX864-15
TEMPERATURE (°C)
(μ5105
VIN = 5.0V
VIN = 3.3V
-55-15-35654585125
SUPPLY CURRENT vs. TEMPERATURE
(VIN = 3.3V)
AX864-16
TEMPERATURE (°C)5105
FC1 = 1, FC0 = 1
FC1 = 1, FC0 = 0
FC1 = 0, FC0 = 1
FC1 = 0, FC0 = 0
-55-15-35654585125
SUPPLY CURRENT vs. TEMPERATURE
(VIN = 5V)
AX864-17
TEMPERATURE (°C)5105
FC1 = 1, FC0 = 1
FC1 = 1, FC0 = 0
FC1 = 0, FC0 = 1
FC1 = 0, FC0 = 0
-55-15-35654585125
PUMP FREQUENCY
vs. TEMPERATURE
MAX864-18
TEMPERATURE (°C)5105
FC1 = 1, FC0 = 1
FC1 = 1, FC0 = 0
FC1 = 0, FC0 = 1
FC1 = 0, FC0 = 0
Dual-Output Charge Pump with Shutdow
____________________________Typical Operating Characteristics (continued)
(VIN= 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
TIME TO EXIT SHUTDOWN
+5V
+10V
-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
CapacitorC1+16
Output of the Inverting Charge PumpV-5
Active-Low Shutdown Input. With
SHDNlow, 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 aswitch.
SHDN6
Frequency Select, MSB (see Table 1)FC17
Frequency Select, LSB (see Table 1)FC08
Negative Terminal of the Flying
Inverting CapacitorC2-4
Ground (connect pins 3 and 11 together)GND3, 11
PIN
Positive Terminal of the Flying
Inverting CapacitorC2+2
Negative Terminal of the Flying Boost
CapacitorC1-1
FUNCTIONNAME
MAX864
C1+1
C1-16
+5V
VCC IN
C2+
C2-
GND
SHDN
FC0
FC1
V+ OUT
V- OUT
SEE TABLE 1 FOR CAPACITOR VALUES.
RL-
RL+
IL+
N.C.
N.C.
GND
N.C.
N.C.
IL-
Figure 1. Test Circuit
Dual-Output Charge Pump with Shutdown
_______________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 VINvolts. 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 2VINby 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
CAPACITORS
C1–C4
(μF)
FREQUENCY
(kHz)1
FC100
FC0b)
C1+C3
C1-S6S8
C2-
GND
RL-
RL+
C2+
GNDIN
IL-
GND
IL+
Figure 2. Idealized Voltage Quadrupler: a) Positive Charge Pump; b) Negative Charge Pump

Partno	Mfg	Dc	Qty	Available	Descript
MAX864EEE+ \|MAX864EEE	MAX	N/a	32	avai	Dual-Output Charge Pump with Shutdown
MAX864EEE+	MAXIM INTEGRATED PRODUCTS	N/a	27	avai	Dual-Output Charge Pump with Shutdown