MAX840ESA+-MAX843ISA+-MAX843ISA+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX840ESA+ ,Low-Noise, Regulated, -2V GaAsFET BiasApplicationsMAX840C/D 0°C to +70°C Dice*Cellular PhonesMAX840ISA -25°C to +85°C 8 SOGaAsFET Power A ..
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MAX840ESA+-MAX843ISA+-MAX843ISA+T
Low-Noise, Regulated, -2V GaAsFET Bias
_______________General Description
The MAX840/MAX843/MAX844 low-noise, inverting
charge-pump power supplies are ideal for biasing
GaAsFETs in cellular telephone transmitter amplifiers.
They operate with inputs down to 2.5V.
The MAX840 offers both a -2V preset output and a -0.5V
to -9.4Vadjustable output. The MAX843/MAX844 use
an external positive control voltage to set the negative
output voltage. Input voltage range for all the devices is
2.5V to 10V, and output current is 4mA with VIN> 2.7V.
These circuits can operate with small capacitors, as low
as 0.22μF.
An internal linear regulator reduces the MAX840’s out-
put voltage ripple to 1mVp-p. With a well-filtered control
voltage (VCTRL), the MAX843/MAX844 also achieve less
than 1mVp-p typical output ripple. Supply current is
750μA, and reduces to less than 1μA in shutdown
(MAX840/MAX843). The MAX844’s unregulated output
is active in shutdown, with the charge pump switching at
20kHz. It provides a low-power LCD supply.
________________________Applications
Cellular Phones
GaAsFET Power Amplifier Modules
Personal Communicators, PDAs
Wireless Data Loggers
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
Regulated Negative Power Supplies
____________________________FeatureFixed -2V or Adjustable -0.5V to -9.4V Output
at 4mA (MAX840)2.5V to 10V Input Voltage RangeOperate with Small Capacitors (as low as 0.22μF)1mVp-p Output Voltage RippleCharge-Pump Switching Frequency:
100kHz in Normal Operation
20kHz in Shutdown Mode (MAX844)1μA Max Logic-Level Shutdown Over Temp.
(MAX840/MAX843)Small 8-Pin SO Package
Low-Noise, Regulated, -2V GaAsFET Bia
( ) ARE FOR MAX843/MAX844
GND
OUT
FB (CONT)SHDN
NEGOUT
C1-
C1+
MAX840
MAX843
MAX844
TOP VIEW
__________________Pin Configuration
MAX840
OUT
SHDN
NEGOUT
C1-
C1+
GND
VIN = 2.5V to 10.0V
(3 CELLS)
0.22μF
VOUT = -2.0V
(VGG of GaAsFET)
4.7μF
0.22μF
0.22μF
ON/OFF
__________Typical Operating Circuit
19-0388; Rev 1; 3/96
PART
MAX840C/D
MAX840ISA
MAX840ESA-40°C to +85°C
-25°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
Dice*
8 SO
8 SO
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
______________Ordering Information
* Dice are specified at TA= +25°C only.
MAX843C/D0°C to +70°CDice*
MAX843ISA-25°C to +85°C8 SO
MAX843ESA-40°C to +85°C8 SO
MAX844C/D0°C to +70°CDice*
MAX844ISA-25°C to +85°C8 SO
MAX844ESA-40°C to +85°C8 SO
Low-Noise, Regulated, -2V GaAsFET Bias
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Figures 2a and 2c, 2.5V ≤VIN≤10V, VOUT= -2V, GND = 0V, RL= ∞, SHDN= VIN, TA= TMINto TMAX, unless otherwise noted.
Typical values are measured at VIN= 3.6V and 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:The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short-circuit
current from 4V to GND is 40mA.
Supply Voltage, VINto GND..................................-0.3V to 10.5V
VNEGOUTto GND...................................................-10.5V to 0.3V
VINto VNEGOUT.........................................................-0.3V to 21V
VOUTto GND (Note 1).......................................VNEGOUTto 0.3V
V SHDNto GND............................................-0.3V to (VIN+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
SO (derate 5.88mW/°C above +70°C).........................471mW
Operating Temperature Ranges
MAX84_I_ _A...................................................-25°C to +85°C
MAX84_E_ _A..................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
C4 = 10μF
VIN= 3.6V,= ∞or 500Ω
MAX844, VIN≤3.6V, SHDN= 0V
MAX844, VIN= 10V, SHDN= 0V
MAX840/MAX843, VIN= 10V, SHDN= 0V
MAX843/MAX844, VCONT= 0V
MAX843/MAX844,
VCTRL= 2V
MAX840, VFB= 0V
MAX840, VFB= -0.5V
MAX840, no load
CONDITIONS
mVp-p1VOUTRipple
mV/mA28VOUTLoad Regulation8
ISHUTShutdown Supply Current940±1±100ICONTCONT Leakage Current±1±100IFBFB Leakage Current-0.516 -0.5-0.484VFBFB Voltage
-2.1-2.0-1.92.510VINSupply Voltage Range
-0.5 to
(VIN- 0.6)VOUTOutput Voltage Adjust Range
VOUTOutput Voltage
UNITSMINTYPMAXSYMBOLPARAMETER100120Oscillator FrequencyFOSCVIN= 3.6V,= +25°C2026
kHz
Input High VoltageVIHSHDN2.2V
VIN≥2.7V,
IOUT= 0mA to 4mA
VIN≥2.5V,
IOUT= 0mA to 3mA
VIN≥2.5V,
IOUT= 0mA to 3mA
VIN≥2.7V,
IOUT= 0mA to 4mA
MAX840, VFB= 0V
MAX843/MAX844,
VCTRL= 2V
Input Low VoltageVILSHDN0.35V
Input CurrentIINSHDN-11μA
Input CapacitanceCINSHDN10pF
MAX840/MAX843/
MAX844
MAX844, SHDN= 0V
No load, VIN≤3.6VIQSupply CurrentμA7501300
Low-Noise, Regulated, -2V GaAsFET Bia
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX840-01
OUTPUT CURRENT (mA)
(V
OUTPUT VOLTAGE vs. INPUT VOLTAGE
OVER TEMPERATURE
MAX840-02
INPUT VOLTAGE (V)
(V
TA = +85°C
TA = +25°C
TA = -40°C
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
AX840-03
INPUT VOLTAGE (V)
(m
VOUT < -1.95V
(CIRCUIT OF FIG 2a)
VOUT < -1.95V
(CIRCUIT OF FIG 2d)
VOUT < 2mVp-p RIPPLE
(CIRCUIT OF FIG 2d)
VOUT < 2mVp-p RIPPLE
(CIRCUIT OF FIG 2a)
High-current operation not
recommended for extended
periods of time.
N0-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
AX840-05
INPUT VOLTAGE (V)
(m483579
NEGOUT CURRENT vs. INPUT VOLTAGE
MAX840-04
INPUT VOLTAGE (V)
(m483579
VNEGOUT = 0.9 x VNEGOUT(NO LOAD)
SHUTDOWN
(MAX844)
SUPPLY CURRENT vs. TEMPERATURE
MAX840-06
TEMPERATURE (°C)
(m
VIN = 10V
VIN = 3.6V
START-UP TIME vs. INPUT VOLTAGE
MAX840-07
INPUT VOLTAGE (V)
(m
__________________________________________Typical Operating Characteristic
(Circuit of Figure 2a, VIN= 3.6V, TA= +25°C, unless otherwise noted.)
Low-Noise, Regulated, -2V GaAsFET Bias
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, VIN= 3.6V, TA= +25°C, unless otherwise noted.)
MAX840 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 1μF, C4 = 10μF)
VIN = 3.6V, VOUT = -2V, IOUT = 4mA, AC COUPLED
10μs/div
VOUT
500μV/div
MAX840 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 0.22μF, C4 = 4.7μF)
VIN = 3.6V, VOUT = -2V, IOUT = 4mA, AC COUPLED
10μs/div
VOUT
1mV/div
MAX843/MAX844 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 1μF, C4 = 10μF)
VIN = 3.6V, VOUT = -2V, IOUT = 4mA, AC COUPLED
10μs/div
VOUT
500μV/div
MAX843/MAX844 OUTPUT NOISE AND RIPPLE
(C1 = C2 = C3 = 0.22μF, C4 = 4.7μF)
VIN = 3.6V, VOUT = -2V, IOUT = 4mA, AC COUPLED
10μs/div
VOUT
1mV/div
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX840-17
SUPPLY VOLTAGE (V)
(k
TA = +25°C, +85°C
TA = -40°C
SHDN = HIGH
MAX844
OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE
AX840-18
SUPPLY VOLTAGE (V)
(k483579
TA = +25°C, +85°C
TA = -40°C
SHDN = LOW
Low-Noise, Regulated, -2V GaAsFET Bia
MAX840 NOISE SPECTRUM
(C1 = C2 = C3 = 0.22μF, C4 = 4.7μF)
FREQUENCY (kHz)
(d
VIN = 3.6V,
IOUT = 4mA
MAX843/MAX844 NOISE SPECTRUM
(C1 = C2 = C3 = 1μF, C4 = 10μF)
FREQUENCY (kHz)
VIN = 3.6V,
IOUT = 4mA
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, VIN= 3.6V, TA= +25°C, unless otherwise noted.)
MAX840 NOISE SPECTRUM
(C1 = C2 = C3 = 1μF, C4 = 10μF)
FREQUENCY (kHz)
(d
VIN = 3.6V,
IOUT = 4mA
VOUTNOTE: dBμV = 20 LOG ______
1μV
Low-Noise, Regulated, -2V GaAsFET Bias
START-UP FROM SHUTDOWN
VIN = 3.6V, VOUT = -2V, IOUT = 4mA
500μs/div
VOUT
1V/div
VSHDN
2V/div
LINE-TRANSIENT RESPONSE
VOUT = -2V, IOUT = 4mA, AC COUPLED
5ms/div
VOUT
10mV/div
VIN2.7V
3.3V
LOAD-TRANSIENT RESPONSE
VIN = 3.6V, VOUT = -2V
5ms/div
VOUT
20mV/div
0.01mA
IOUT4mA
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, VIN= 3.6V, TA= +25°C, unless otherwise noted.)
MAX843/MAX844 NOISE SPECTRUM
(C1 = C2 = C3 = 0.22μF, C4 = 4.7μF)
FREQUENCY (kHz)
VIN = 3.6V,
IOUT = 4mA
VOUTNOTE: dBμV = 20 LOG ______
1μV

Partno	Mfg	Dc	Qty	Available	Descript
MAX840ESA+	MAXIM	N/a	1500	avai	Low-Noise, Regulated, -2V GaAsFET Bias
MAX843ISA+ \|MAX843ISA	MAXIM	N/a	280	avai	Low-Noise, Regulated, -2V GaAsFET Bias
MAX843ISA+T	MAXIM	N/a	289	avai	Low-Noise, Regulated, -2V GaAsFET Bias