MAX864EEE Fast Delivery |IC PHOENIX CO.,LIMITED

MAX864EEE ,Dual-Output Charge Pump with ShutdownApplicationsMAX864C/D 0°C to +70°C Dice*Low-Voltage GaAsFET Bias in Wireless HandsetsMAX864EEE -40° ..
MAX864EEE ,Dual-Output Charge Pump with ShutdownFeaturesThe MAX864 CMOS, charge-pump, DC-DC voltage' Requires Only Four Capacitorsconverter produce ..
MAX864EEE+ ,Dual-Output Charge Pump with ShutdownApplicationsMAX864C/D 0°C to +70°C Dice*Low-Voltage GaAsFET Bias in Wireless HandsetsMAX864EEE -40° ..
MAX864EEE+ ,Dual-Output Charge Pump with ShutdownFeaturesThe MAX864 CMOS, charge-pump, DC-DC voltage♦ Requires Only Four Capacitorsconverter produce ..
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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
____________________________FeaturesRequires 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
MAX864
Dual-Output Charge Pump with Shutdown
__________________Pin Configuration
__________Typical Operating Circuit
19-0478; Rev 0; 3/96
MAX864
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°C
__________________________________________Typical Operating Characteristics
(VIN= 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX864-07
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)3035
EFFICIENCY vs. OUTPUT CURRENT
@ 7kHz PUMP FREQUENCY
MAX864-01
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (2530
EFFICIENCY vs. OUTPUT CURRENT
@ 33kHz PUMP FREQUENCY
MAX864-02
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (2530
EFFICIENCY vs. OUTPUT CURRENT
@ 100kHz PUMP FREQUENCY
MAX864-03
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (2530
EFFICIENCY vs. OUTPUT CURRENT
@ 185kHz PUMP FREQUENCY
MAX864-04
OUTPUT CURRENT (mA)
EFFICIENCY V+, V- (2530
OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
MAX864-05
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (
OUTPUT RESISTANCE
vs. TEMPERATURE
MAX864-06
TEMPERATURE (°C)
OUTPUT RESISTANCE (2585105
OUTPUT CURRENT vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
MAX864-08
PUMP CAPACITANCE (μF)
OUTPUT CURRENT FROM V+ TO V- (mA)4045
MAX864
Dual-Output Charge Pump with Shutdown
MAX864
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)
MAX864-10
PUMP CAPACITANCE (μF)
OUTPUT CURRENT FROM V+ TO V- (mA)4045
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 1.9V, V+ + V- = 6V)
MAX864-11
PUMP CAPACITANCE (μF)
OUTPUT VOLTAGE RIPPLE (mVp-p)4045
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 3.15V, V+ + V- = 10V)
MAX864-12
PUMP CAPACITANCE (μF)
OUTPUT VOLTAGE RIPPLE (mVp-p)4045
OUTPUT VOLTAGE RIPPLE
vs. PUMP CAPACITANCE
(VIN = 4.75V, V+ + V- = 16V)
MAX864-13
PUMP CAPACITANCE (μF)
OUTPUT VOLTAGE RIPPLE (mVp-p)4045
1.02.04.06.0
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX864-14
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (nA)
-55-15-35654585125
SUPPLY CURRENT vs. TEMPERATURE
(VIN = 3.3V)
MAX864-16
TEMPERATURE (°C)
SUPPLY CURRENT (mA)5105
-55-15-35654585125
SUPPLY CURRENT vs. TEMPERATURE
(VIN = 5V)
MAX864-17
TEMPERATURE (°C)
SUPPLY CURRENT (mA)5105
MAX864
Dual-Output Charge Pump with Shutdown
____________________________Typical Operating Characteristics (continued)
(VIN= 5.0V, capacitor values in Table 1, TA= +25°C, unless otherwise noted.)
_____________________Pin Description
MAX864
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
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.

Partno	Mfg	Dc	Qty	Available	Descript
MAX864EEE	MAXIM	N/a	106	avai	Dual-Output Charge Pump with Shutdown
MAX864EEE	MAX	N/a	724	avai	Dual-Output Charge Pump with Shutdown