TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125

REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP

DC/DC CONVERTERS

SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000

1

POST OFFICE BOX 655303

features

Range Because of Special Switching

Topology

Input Voltage Range of 1.8-V to 3.6-V

Detectors

(TPS60120EVM-142)

applications

·

description

The TPS6012x step-up, regulated charge pumps

generate a 3.3-V or 3-V

±4% output voltage from

a 1.8-V to 3.6-V input voltage (two alkaline, NiCd,

or NiMH batteries). They can deliver an output

current of at least 200 mA (100 mA for the

TPS60122 and TPS60123), all from a 2-V input.

Four external capacitors are needed to build a

complete high efficiency dc/dc charge pump

converter. To achieve the high efficiency over a

wide input voltage range, the charge pump

automatically selects between a 1.5x or doubler

conversion mode. From a 2-V input, all ICs can

start with full load current.

The devices feature the power-saving pulse-skip

mode to extend battery life at light loads.

TPS60120, TPS60122, and TPS60124 include a

low battery comparator. TPS60121, TPS60123,

and TPS60125 feature a power-good output. The

logic shutdown function reduces the supply

current to a maximum of 1

µA and disconnects the

load from the input. Special current-control

circuitry prevents excessive current from being

drawn from the battery during start-up. This dc/dc

converter requires no inductors, therefore EMI is

of low concern. It is available in the small,

thermally enhanced 20-pin PowerPAD

t package

(PWP).

IO = 66 mA

0

10

20

30

40

50

60

70

80

90

100

1.8

2

2.2

2.4 2.6

2.8

3

3.2

3.4 3.6

VI – Input Voltage – V

IO = 164 mA

IO = 216 mA

IO = 116 mA

VO = 3.3 V

TC = 25°C

IN

IN

LBI

C1+

C1–

ENABLE

PGND GND

OUT

OUT

FB

LBO

C2+

C2–

CO

22

µF

Ci

10

µF

Output

3.3 V

C2

2.2

µF

C1

2.2

µF

R1

R2

Input

1.8 V to 3.6 V

OFF/ON

efficiency (TPS60120, TPS60121)

typical operating circuit

R3

TPS60120

Copyright

© 2000, 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.

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.

PowerPAD is a trademark of Texas Instruments Incorporated.