TPS60400, TPS60401, TPS60402, TPS60403

UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER

SLVS324 – JULY 2001

1

POST OFFICE BOX 655303

features

Needed

at Low Output Currents (TPS60400)

Start-Up Into Load

TPS60400EVM–178

applications

description

The TPS6040x is a family of devices that generate an unregulated negative output voltage from an input voltage

ranging from 1.6 V to 5.5 V. The devices are typically supplied by a preregulated supply rail of 5 V or 3.3 V. Due

to its wide input voltage range, two or three NiCd, NiMH, or alkaline battery cells, as well as one Li-Ion cell can

also power them.

Only three external 1-

µF capacitors are required to build a complete dc/dc charge pump inverter. Assembled

and component count reduction is achieved by replacing the Schottky diode that is typically needed for start-up

into load by integrated circuitry.

The TPS6040x can deliver a maximum output current of 60 mA with a typical conversion efficiency of greater

than 90% over a wide output current range. Three device options with 20-kHz, 50-kHz, and 250-kHz fixed

frequency operation are available. One device comes with a variable switching frequency to reduce operating

current in applications with a wide load range and enables the design with low-value capacitors.

typical application circuit

TPS60400

CFLY–

CFLY+

35

OUT

IN

GND

1

2

4

CI

1

µF

CO

1

µF

Output

–1.6 V to –5 V,

Max 60 mA

Input

1.6 V to 5.5 V

C(fly)

1

µF

–5

–4

–3

–2

–1

0

01

23

45

IO = 60 mA

IO = 30 mA

IO = 1 mA

TA = 25°C

VI – Input Voltage – V

TPS60400

OUTPUT VOLTAGE

vs

INPUT VOLTAGE

Copyright

 2001, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

3

2

4

5

DBV PACKAGE

(TOP VIEW)

1

OUT

IN

CFLY–

CFLY+

GND

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.