MAX768EEE+-MAX768EEE+T 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 ..
MAX768EEE+T ,Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO SuppliesELECTRICAL CHARACTERISTICS(V = +3V, SYNC = IN, SETN = SETP = GND, NSHDN = PSHDN = IN, T = -40°C to ..
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MAX768EEE+-MAX768EEE+T
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
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
________________________________________________________________Maxim Integrated Products1
MAX768
POUT
POSITIVE
OUTPUT
+5V
NEGATIVE
OUTPUT
-5V
OUTPUT-
READY
SIGNALC1
NOUT
RDY
SYNC
VIN
(3.0V TO 5.5V)
GND SETPSETN
PSHDN
NSHDN
C1+
C1-
C2+
C2-
__________Typical Operating Circuit
19-1174; Rev 0; 12/96
PART
MAX768C/D
MAX768EEE-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
Dice*
16 QSOP
______________Ordering Information
*Dice are specified at TA= +25°C, DC parameters only.
Pin Configuration appears at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products.
& the latest literature: http://,
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
0mA < ILOAD< 5mA, VIN= 3.0V to 5.5V
ILOAD= 0
NSHDN= PSHDN= SYNC = GND
VSHDN= 3V
VIN= 3V to 5.5V
NSHDN= GND
(Note 2)
(Note 3)
VIN= 3V, VPOUT‡4.81V, VNOUT≤-4.82V
VIN= 3.0V
IPOUT= 0mA to 5mA,
INOUT= 0mA to -5mA
CONDITIONS0.110Shutdown Supply Current0.12SHDNInput Bias Current2.0Shutdown/SYNC Logic-High Input Threshold0.4Shutdown/SYNC Logic-Low Input Threshold
%/mA0.060.12Load Regulation-5.10-5.00-4.82Negative Output Voltage2.53.05.5Input Voltage Range
Minimum Input Start-Up Voltage
%/V-0.120.00.12Line Regulation0.3No-Load Supply Current at 100kHz
(negative regulator off)1.2511Positive Output Voltage Adjustable Range-11-1.25Negative Output Voltage Adjustable Range5Maximum POUT, NOUT Output Currents0.81.4No-Load Supply Current at 100kHz
(both regulators active)
UNITSMINTYPMAXPARAMETER
VSYNC= GNDmA0.450.80No-Load Supply Current at 25kHz
(both regulators active)420900Dropout Voltage (2 x VIN- |VOUT|)20
VIN= 5.5V1.5
IPOUT= INOUT= 5mA2 x VIN- | VOUT |
0mA < ILOAD< 5mA, VIN= 3.0V to 5.5VV4.815.005.14Positive Output Voltage
CPOUT =CNOUT =10μF,
10kHz < f < 1MHz1.7
POUT
NOUTmVp-p1.2Output Voltage Noise
SHUTDOWN
IPOUT= INOUT= 0.1mA
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)
SYNC = GND (divide by 4)
CONDITIONS0.12SYNC Input Leakage Current
21.52528.54060SYNC Duty Cycle (external)
kHz20240SYNC Frequency Range (external)
UNITSMINTYPMAXPARAMETER
INOUT= 0.1mA
IPOUT= 0.1mA-1.275-1.25-1.225Negative Set-Reference Voltage-1.270-1.25-1.2301.2151.251.285Positive Set-Reference Voltage1.2171.251.283
VRDY= 10V
Percent of VNOUT, INOUT= 5mA
VSETP= VSETN= 1.3V10Maximum Sink Current0.012Output Off Current859498RDYOutput Threshold0.010.1SETP, SETN Input Leakage Current
VSYNC= 3VkHz85100115Oscillator Frequency (internal)= +25°C= -40°C to + 85°C= +25°C= -40°C to + 85°C
ISINK= 2mAV0.25Output Low Voltage
SYNC
SET INPUT
RDYOUTPUT
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.)
IN = 3.0V
NOUT = -5V
POUT = +5V51525
mVRMS OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX768-TOC01
OUTPUT CURRENT (mA)
(m20
POUT OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX768-TOC02
OUTPUT CURRENT (mA)
(V2025
IN = 4.0V
IN = 3.0V
ONLY POUT LOADED
NOUT OUTPUT VOLTAGE vs.
OUTPUT CURRENT
MAX768-TOC03
OUTPUT CURRENT (mA)
(V2025
IN = 4.0V
IN = 3.0V
ONLY NOUT LOADED
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies_______________________________________________________________________________________
SHDN SUPPLY CURRENT
vs. TEMPERATURE
MAX768-TOC07
TEMPERATURE (°C)
(m10
VIN = 3.3V
VIN = 5.0V
EFFICIENCY vs. LOAD CURRENT
(NOUT ONLY LOADED)
MAX768 TOC10
LOAD CURRENT (mA)
FIC
(%
VIN = 3.0V
VIN = 4.0V
SHDN SUPPLY CURRENT
vs. TEMPERATURE
MAX768-TOC08
TEMPERATURE (°C)
(m10
VIN = 5.0V
VIN = 4.0V
VIN = 3.3V
CHARGE-PUMP FREQUENCY
vs. SUPPLY VOLTAGE
MAX768-TOC05
SUPPLY VOLTAGE (V)
E-P
(kH
SYNC = GND
SYNC = IN
CHARGE-PUMP FREQUENCY
vs. TEMPERATURE
MAX768-TOC06TEMPERATURE (°C)
E-P
(kH-15458565105
SYNC = GND
SYNC = INVIN = 3.3V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (NO LOAD)
MAX768-TOC09
SUPPLY VOLTAGE (V)
T (m
f = 25kHz
f = 100kHz
EFFICIENCY vs. OUTPUT CURRENT
(POUT ONLY LOADED)
MAX768 TOC11
OUTPUT CURRENT (mA)
(%
VIN = 3.0V
VIN = 4.0V
EFFICIENCY vs. OUTPUT CURRENT
LOAD BETWEEN POUT AND NOUT
MAX768 TOC12
OUTPUT CURRENT (mA)
(%
VIN = 3.0V
VIN = 4.0V
____________________________Typical Operating Characteristics (continued)
(SYNC = IN, TA = +25°C, unless otherwise noted.)40120320
SUPPLY CURRENT
vs. SYNC FREQUENCY
MAX768-TOC04
SYNC FREQUENCY (kHz)
Y C
(m
VIN = 3.3V
VIN = 5.0V
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
_______________________________________________________________________________________5
_____________________________Typical Operating Characteristics (continued)
(SYNC = IN, TA = +25°C, unless otherwise noted.)
POUT MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
AX768-TOC13
SUPPLY VOLTAGE (V)
XIM
T (m
ONLY POUT LOADED
NOUT MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
AX768-TOC14
SUPPLY VOLTAGE (V)
XIM
T (m
4.53.5ONLY NOUT LOADED
+3V, PSHDN = NSHDN
+5V, VPOUT
-5V, VNOUT
0V, RDY
TIME TO EXIT SHUTDOWN
MAX768-TOC15
1ms/div
VPOUT, 500mV/div
AC COUPLED
POUT OUTPUT NOISE AND RIPPLE
MAX768-TOC16
500ms/div
POUT = +5V AT 5mA
IN = 3.0V
VNOUT, 500mV/div
AC COUPLED
NOUT OUTPUT NOISE AND RIPPLE
MAX768-TOC17
500ms/div
NOUT = -5V AT 5mA
IN = 3.0V
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies_______________________________________________________________________________________SYNC
Clock Synchronizing Input. Connect an external 20kHz ≤fCLK≤240kHz to SYNC to synchronize the
MAX768 to that frequency. Connect SYNC to GND to select the internal 25kHz clock, or to IN for the inter-
nal 100kHz clock.V+Doubler Charge-Pump Output. See Table 2 for capacitor selection.INSupply (3V to 5.5V). Bypass IN with 4.7μF to GND.
NAMEFUNCTIONC1-Negative Terminal of the Doubler Charge-Pump Capacitor. See Table 2 for capacitor selection.C2+Positive Terminal of the Inverter Charge-Pump Capacitor. See Table 2 for capacitor selection.
PINC1+Positive Terminal of the Doubler Charge-Pump Capacitor. See Table 2 for capacitor selection.SETPSet Positive Output Voltage Input. Connect SETP to GND for factory-preset +5V output. Connect a resistor
divider between POUT, SETP, and GND for custom output voltage setting.POUTPositive Regulator Output. See Table 2 for capacitor selection.RDYOutput-Ready Indicator. This open-drain output pulls to GND when the negative output voltage (NOUT) is
within 10% of the regulation voltage.NOUTNegative Regulator Output. See Table 2 for capacitor selection.NSHDNNegative-Supply Shutdown Input. Pull NSHDNlow to turn off the inverting charge pump, the negative reg-
ulator, and the bias-ready indicator. If PSHDNis also low, the part completely shuts down.PSHDNPositive-Supply Shutdown Input. Pull PSHDNlow to turn off the positive regulator. If NSHDNis also low,
the part completely shuts down.SETNSet Negative Output Voltage Input. Connect SETN to GND for factory-preset -5V. Connect a resistor
divider between NOUT, SETN, and GND for custom output voltage setting.C2-Negative Terminal of the Inverter Charge-Pump CapacitorV-Inverter Charge-Pump Output. See Table 2 for capacitor selection.GNDGround
______________________________________________________________Pin Description

Partno	Mfg	Dc	Qty	Available	Descript
MAX768EEE+ \|MAX768EEE	MAXIM	N/a	1000	avai	Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies
MAX768EEE+T	MAXIM	N/a	456	avai	Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies