MAX768EEE Fast Delivery |IC PHOENIX CO.,LIMITED

MAX768EEE ,Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO SuppliesFeaturesThe MAX768 low-noise, dual-output, regulated charge' Dual Positive/Negative Regulated Outpu ..
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MAX768EEE
Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies
_______________General Description
The MAX768 low-noise, dual-output, regulated charge
pump provides a negative output for biasing GaAsFET
power amplifiers, and a positive output for powering
voltage-controlled oscillators (VCOs) in wireless hand-
sets. The outputs can also be used to power LCDs.
Output ripple is less than 2mVp-p. The MAX768 is
intended for use in low-voltage systems where a simple
charge-pump inverter is inadequate, or where the VCO
needs more range to improve its signal-to-noise ratio.
The input range is 2.5V to 5.5V, enabling direct power
from 1Li+ and 3-cell NiMH/NiCd batteries.
The MAX768 includes a voltage-doubler charge pump,
followed by an inverting charge pump. This combina-
tion produces unregulated outputs that are ±2x the
input. Two internal low-dropout linear regulators provide
the low-noise, regulated positive and negative outputs.
Output current is guaranteed to be at least 5mA per
output. The linear regulators use CMOS devices, so the
quiescent current remains independent of output load-
ing (even in dropout), and the dropout voltage
approaches zero with no load current.
The MAX768 has two preset switching frequencies
(25kHz or 100kHz), or can be synchronized by an exter-
nal clock from 20kHz to 240kHz. This flexibility permits
users to optimize their designs based on noise, capaci-
tor size, and quiescent-supply-current criteria.
The device features Dual Mode™ operation: the output
voltage is preset to +5V and -5V, or can be adjusted by
adding external resistor dividers. Other features include
independent shutdowns and a logic output that signals
when the negative voltage has risen to within 10% of its
regulation setpoint (to protect the power amplifier
GaAsFET). The MAX768 is available in a space-saving,
16-pin QSOP, which is the same size as a standard
8-pin SO.
________________________Applications
GaAsFET Power Amp Bias
Voltage-Controlled Oscillator (VCO) Supply
Tuner Diode Power Supply
Positive and Negative LCD Supply
Cellular Phone
PCS and Cordless Phone
Wireless Handsets
Wireless Handheld Computers
Wireless PCMCIA Cards
Modems
____________________________FeaturesDual Positive/Negative Regulated Outputs:
±5VOUTfrom 3VINOutput-Ready Indicator to Protect GaAsFET PAs2.5V to 5.5V Input Voltage RangeLow-Noise Output Ripple: < 2mVp-pSynchronizable Switching FrequencyUses Only Small, Low-Cost Capacitors0.1µA Independent Shutdown ControlsAdjustable Output VoltagesSmall 16-Pin QSOP Package
MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
________________________________________________________________Maxim Integrated Products1
19-1174; Rev 0; 12/96
& the latest literature: http://,
MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +3V, SYNC = IN, SETN = SETP = GND, NSHDN= PSHDN= IN, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at TA= +25°C. See Figure 2.) (Note 1)
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.
VIN, C1-, SYNC, PSHDN, NSHDNto GND...............-0.3V to +6V
V+, C1+, C2+, RDYto GND...................................-0.3V to +12V
SETP to GND ..........................................................-0.3V to +3V
SETN to GND............................................................-3V to +0.3V
V-, C2- to GND......................................................-12V to +0.3V
OUTP, OUTN Short Circuited to GND .......................Continuous
NOUT to V- ...........................................................-0.3V to +12V
POUT to V+...........................................................-12V to +0.3V
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.70mW/°C above +70°C)......................696mW
Operating Temperature Range
MAX768EEE.......................................................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +3V, SYNC = IN, SETN = SETP = GND, NSHDN= PSHDN= IN, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at TA= +25°C. See Figure 2.) (Note 1)
Note 1:Parameters to -40°C are guaranteed by design, not production tested.
Note 2:Maximum output voltage range is from the positive reference voltage to 2 x VIN- dropout voltage.
Note 3:Maximum output voltage range is from the negative reference voltage to -2 x VIN+ dropout voltage.
__________________________________________Typical Operating Characteristics
(SYNC = IN, TA = +25°C, unless otherwise noted.)
mVRMS OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX768-TOC01
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (mV
RMS20
POUT OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX768-TOC02
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)2025
NOUT OUTPUT VOLTAGE vs.
OUTPUT CURRENT
MAX768-TOC03
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)2025
-4.6
MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies_______________________________________________________________________________________
SHDN SUPPLY CURRENT
vs. TEMPERATURE
MAX768-TOC07
TEMPERATURE (°C)
SHDN SUPPLY CURRENT (10
EFFICIENCY vs. LOAD CURRENT
(NOUT ONLY LOADED)
MAX768 TOC10
LOAD CURRENT (mA)
EFFICIENCY (%)
SHDN SUPPLY CURRENT
vs. TEMPERATURE
MAX768-TOC08
TEMPERATURE (°C)
SHDN SUPPLY CURRENT (10
CHARGE-PUMP FREQUENCY
vs. SUPPLY VOLTAGE
MAX768-TOC05
SUPPLY VOLTAGE (V)
CHARGE-PUMP FREQUENCY (kHz)
CHARGE-PUMP FREQUENCY
vs. TEMPERATURE
MAX768-TOC06
TEMPERATURE (°C)
CHARGE-PUMP FREQUENCY (kHz)-15458565105
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (NO LOAD)
MAX768-TOC09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(POUT ONLY LOADED)
MAX768 TOC11
OUTPUT CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY vs. OUTPUT CURRENT
LOAD BETWEEN POUT AND NOUT
MAX768 TOC12
OUTPUT CURRENT (mA)
EFFICIENCY (%)
____________________________Typical Operating Characteristics (continued)
(SYNC = IN, TA = +25°C, unless otherwise noted.)40120320
SUPPLY CURRENT
vs. SYNC FREQUENCY
MAX768-TOC04
SYNC FREQUENCY (kHz)
SUPPLY CURRENT (mA)
16080200240280
MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies5
_____________________________Typical Operating Characteristics (continued)
(SYNC = IN, TA = +25°C, unless otherwise noted.)
POUT MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
MAX768-TOC13
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
NOUT MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
MAX768-TOC14
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
4.53.5
MAX768
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies_______________________________________________________________________________________
______________________________________________________________Pin Description

Partno	Mfg	Dc	Qty	Available	Descript
MAX768EEE	MAXIM	N/a	3790	avai	Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies
MAX768EEE	MAX	N/a	2902	avai	Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies