MAX840 Maxim, MAX840 Datasheet
MAX840
Manufacturer Part Number
MAX840
Description
Low-Noise / Regulated / -2V GaAsFET Bias
Manufacturer
Maxim
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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 -9.4V adjustable 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 V
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 (V
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
19-0388; Rev 1; 3/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________Typical Operating Circuit
_______________General Description
0.22 F
0.22 F
Cellular Phones
GaAsFET Power Amplifier Modules
Personal Communicators, PDAs
Wireless Data Loggers
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
Regulated Negative Power Supplies
ON/OFF
CTRL
), the MAX843/MAX844 also achieve less
Low-Noise, Regulated, -2V GaAsFET Bias
________________________________________________________________ Maxim Integrated Products
C1+
C1-
NEGOUT
SHDN
V
IN
= 2.5V to 10.0V
MAX840
(3 CELLS)
GND
IN
OUT
FB
(V
0.22 F
4.7 F
V
GG
OUT
of GaAsFET)
IN
= -2.0V
> 2.7V.
____________________________Features
* Dice are specified at T
__________________Pin Configuration
______________Ordering Information
MAX840C/D
MAX840ISA
MAX840ESA
MAX843C/D
MAX843ISA
MAX843ESA
MAX844C/D
MAX844ISA
MAX844ESA
Fixed -2V or Adjustable -0.5V to -9.4V Output
at 4mA (MAX840)
2.5V to 10V Input Voltage Range
Operate with Small Capacitors (as low as 0.22µF)
1mVp-p Output Voltage Ripple
Charge-Pump Switching Frequency:
1µA Max Logic-Level Shutdown Over Temp.
(MAX840/MAX843)
Small 8-Pin SO Package
TOP VIEW
( ) ARE FOR MAX843/MAX844
100kHz in Normal Operation
20kHz in Shutdown Mode (MAX844)
PART
NEGOUT
SHDN
C1+
C1-
-25°C to +85°C
-40°C to +85°C
-25°C to +85°C
-40°C to +85°C
-25°C to +85°C
-40°C to +85°C
1
2
3
4
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
A
= +25°C only.
MAX840
MAX843
MAX844
SO
8
7
6
5
PIN-PACKAGE
Dice*
8 SO
8 SO
Dice*
8 SO
8 SO
Dice*
8 SO
8 SO
IN
GND
OUT
FB (CONT)
1
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