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TelCom Semiconductor - REGULATED GaAs FET BIAS SUPPLY

Numéro de référence TCM850COA
Description REGULATED GaAs FET BIAS SUPPLY
Fabricant TelCom Semiconductor 
Logo TelCom Semiconductor 





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TCM850COA fiche technique
EVALUATION
KIT
AVAILABLE
1TCM850
TCM851
TCM852
TCM853
REGULATED GaAs FET BIAS SUPPLY
FEATURES
s Fixed – 4.1V or Adjustable – 0.5V to – 9V Output
at 5mA
s 4.5V to 10V Input Voltage Range
s Low Output Voltage Ripple
TCM850-852 .............................................. 2mVp-p
TCM853 ...................................................... 1mVp-p
s 100kHz Charge Pump Switching Frequency
s Optional External Synchronizing Clock
Input (TCM852)
s Logic Level Shutdown Mode ................ 0.5µA Typ.
Temperature (TCM850/852/853)
s Low Cost, 8-Pin SOIC Package
GENERAL DESCRIPTION
The TCM850/1/2/3 combines an inverting charge pump
and a low noise linear regulator in a single small outline
package. They are ideal for biasing GaAS FETs in cellular
telephone transmitter power amplifiers
All four devices accept a range of input voltages from
4.5V to 10.0V and have – 5mA output current capability. The
TCM850/1/2 have both preset (– 4.1V) and variable (– 0.5V
to –9.0V) output voltages that program with an external
resistor divider. The TCM853 output voltage programs with
an external positive control voltage. The TCM850/1/3 can
be shutdown reducing quiescent current to less than
0.5µA (typ) over temperature, 2µA (typ) for the TCM851.
2
3
APPLICATIONS
s Cellular Phones
s Negative Regulated Power Supplies
s LCD Bias Contrast Control
s Adjustable GaAs FET Bias
s Wireless Data Loggers
FUNCTIONAL BLOCK DIAGRAM
ORDERING INFORMATION
Part No.
TCM850COA
TCM850EOA
TCM851COA
TCM851EOA
TCM852COA
TCM852EOA
TCM853COA
TCM853EOA
TCM850EV
Package
Temp. Range
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
0°C to +70°C
– 40°C to +85°C
0°C to +70°C
– 40°C to +85°C
8-Pin SOIC
0°C to +70°C
8-Pin SOIC
– 40°C to +85°C
8-Pin SOIC
0°C to +70°C
8-Pin SOIC
– 40°C to +85°C
Evaluation Kit for
TCM850/1/2/3
4
5
C1+
C1
C1–
NEGOUT
C2
CHARGE
PUMP
N
TCM850
TCM851
TCM852
SHDN (TCM850)
SHDN (TCM851)
OSC (TCM852)
– 1.28V
REF
IN
C3
OUT
C4
C1+
C1
C1–
CHARGE
PUMP
TCM853
NEGOUT
C2
N
FB
(GND to SET
VOUT = – 4.1V)
SHDN
6
IN
C3
OUT
C4
7
CONT
(CONTROL VOLTAGE)
GND
TELCOM SEMICONDUCTOR, INC.
Figure 1.
GND
TC850/1/2/3-3 10/1/96
8
4-27

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