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MAX850ESA-T

更新时间： 2024-02-08 18:17:35
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美信 - MAXIM 泵
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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  
-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  
12345678

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