TCM850 Просмотр технического описания (PDF) - TelCom Semiconductor Inc => Microchip

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производитель

TCM850

REGULATED GaAs FET BIAS SUPPLY

TelCom Semiconductor Inc => Microchip 

EVALUATION

KIT

AVAILABLE

1 TCM850

TCM851

TCM852

TCM853

REGULATED GaAs FET BIAS SUPPLY

2

FEATURES

GENERAL DESCRIPTION

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

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

3 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.

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.

Package

4

Temp. Range

TCM850COA

TCM850EOA

TCM851COA

TCM851EOA

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

TCM852COA

TCM852EOA

TCM853COA

TCM853EOA

TCM850EV

8-Pin SOIC

8-Pin SOIC

5 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

Evaluation Kit for

TCM850/1/2/3

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

N

C2

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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