19-0238; Rev 2; 4/96
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
0–MAX853
_______________Ge n e ra l De s c rip t io n
The MAX850–MAX853 low-noise, inverting, charge-
pump power supplies are ideal for biasing GaAsFETs in
cellular telephone transmitter amplifiers.
____________________________Fe a t u re s
♦ 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)
The MAX850–MAX852 offer both preset (-4.1V) and
a d jus ta b le (-0.5V to -9.0V) outp ut volta g e s . 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.
♦ 100kHz Charge-Pump Switching Frequency
(MAX850/MAX851/MAX853)
♦ External Synchronizing Clock Input (MAX852)
An internal linear regulator reduces the output voltage
ripple to 2mVp-p. With a well-filtered control voltage
♦ Logic-Level Shutdown Mode: 1µA Max Over
Temperature (MAX850/MAX852/MAX853)
(V
), the MAX853 achieves typical output ripple of
CTRL
♦ Low Cost, 8-Pin SO Package
less than 1mVp-p. Supply current is 3mA max, and
shutdown current is less than 1µA max over temperature
(5µA max for MAX851).
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
Dice*
8 SO
MAX850C/D
MAX850ISA
MAX850ESA
MAX851C/D
MAX851ISA
MAX851ESA
MAX852C/D
MAX852ISA
MAX852ESA
MAX853C/D
MAX853ISA
MAX853ESA
________________________Ap p lic a t io n s
Cellular Phones
-25°C to +85°C
-40°C to +850°C
0°C to +70°C
8 SO
Negative Regulated Power Supplies
Personal Communicators, PDAs
Wireless Data Loggers
Dice*
8 SO
-25°C to +85°C
-40°C to +85°C
0°C to +70°C
8 SO
Dice*
8 SO
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
-25°C to +85°C
-40°C to +85°C
0°C to +70°C
8 SO
Dice*
8 SO
8 SO
ise*
-25°C to +85°C
-40°C to +85°C
__________Typ ic a l Op e ra t in g Circ u it
°
* Dice are specified at T = +25 C only.
A
V
IN
= 4.5V to 10.0V
(4 CELLS)
C3
__________________P in Co n fig u ra t io n
IN
C1+
C1-
V
= -4.1V
OUT
TOP VIEW
C1
C2
(V of GaAsFET)
GG
MAX850
MAX851
MAX852
OUT
C4
C1+
C1-
IN
1
2
3
4
8
7
6
5
NEGOUT
GND
OUT
MAX850
MAX851
MAX852
MAX853
NEGOUT
SHDN*
SHDN
OSC
FB
FB**
SHDN*
(MAX850–852)
(MAX850/853)
GND
SO
* MAX850: SHDN
MAX851: SHDN
MAX852: OSC
* SHDN (MAX851)
OSC (MAX852)
** CONT (MAX853)
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800