MAX850 Maxim, MAX850 Datasheet
MAX850
Manufacturer Part Number
MAX850
Description
Low-Noise / Regulated / Negative Charge-Pump Power Supplies for GaAsFET Bias
Manufacturer
Maxim
Datasheet
1.MAX850.pdf
(8 pages)
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The MAX850–MAX853 low-noise, inverting, charge-
pump power supplies are ideal for biasing GaAsFETs in
cellular telephone transmitter amplifiers.
The MAX850–MAX852 offer both preset (-4.1V) and
adjustable (-0.5V to -9.0V) output voltages. The
MAX853 uses an external positive control voltage to set
the negative output voltage. Input voltage range for all
four devices is 4.5V to 10V. Output current is 5mA.
An internal linear regulator reduces the output voltage
ripple to 2mVp-p. With a well-filtered control voltage
(V
less than 1mVp-p. Supply current is 3mA max, and
shutdown current is less than 1µA max over temperature
(5µA max for MAX851).
________________________Applications
19-0238; Rev 2; 4/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________Typical Operating Circuit
_______________General Description
Charge-Pump Power Supplies for GaAsFET Bias
CTRL
* MAX850: SHDN
MAX851: SHDN
MAX852: OSC
), the MAX853 achieves typical output ripple of
Cellular Phones
Negative Regulated Power Supplies
Personal Communicators, PDAs
Wireless Data Loggers
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
C1
C2
________________________________________________________________ Maxim Integrated Products
C1+
C1-
NEGOUT
SHDN*
SHDN
OSC
V
IN
= 4.5V to 10.0V
MAX850
MAX851
MAX852
(4 CELLS)
GND
IN
OUT
FB
Low-Noise, Regulated, Negative
(V
C3
C4
V
GG
OUT
of GaAsFET)
= -4.1V
____________________________Features
* Dice are specified at T
______________Ordering Information
MAX850C/D
MAX850ISA
MAX850ESA
MAX851C/D
MAX851ISA
MAX851ESA
MAX852C/D
MAX852ISA
MAX852ESA
MAX853C/D
MAX853ISA
MAX853ESA
__________________Pin Configuration
Fixed -4.1V or Adjustable -0.5V to -9V Output at 5mA
4.5V to 10V Input Voltage Range
2mVp-p Output Voltage Ripple (MAX850–MAX852)
1mVp-p Output Voltage Ripple (MAX853)
100kHz Charge-Pump Switching Frequency
(MAX850/MAX851/MAX853)
External Synchronizing Clock Input (MAX852)
Logic-Level Shutdown Mode: 1µA Max Over
Temperature (MAX850/MAX852/MAX853)
Low Cost, 8-Pin SO Package
TOP VIEW
PART
* SHDN (MAX851)
OSC (MAX852)
(MAX850/853)
NEGOUT
SHDN*
C1+
C1-
-25°C to +85°C
-40°C to +850°C
-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
TEMP. RANGE
A
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
1
2
3
4
= +25 ° C only.
MAX850
MAX851
MAX852
MAX853
SO
** CONT (MAX853)
8
7
6
5
ise*
PIN-PACKAGE
IN
GND
OUT
FB**
(MAX850–852)
Dice*
Dice*
Dice*
Dice*
8 SO
8 SO
8 SO
8 SO
8 SO
8 SO
8 SO
8 SO
1
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