TPS64200,TPS64201

TPS64202,TPS64203

SLVS485 − AUGUST 2003

SOT23 STEPDOWN CONTROLLER

FEATURES

up to 95% Efficiency

Range

Dropout

APPLICATIONS

DESCRIPTION

The

TPS6420x

are

nonsynchronous

step-down

controllers that are ideally suited for systems powered

from a 5-V or 3.3-V bus or for applications powered from

a 1-cell Li-Ion battery or from a 2- to 4-cell NiCd, NiMH, or

alkaline battery. These step-down controllers drive an

external P-channel MOSFET allowing design flexibility. To

achieve highest efficiency over a wide load current range,

this controller uses a minimum on time, minimum off time

control scheme and consumes only 20-

µA quiescent

current. The minimum on time of typically 600 ns

(TPS64203) allows the use of small inductors and

capacitors. When disabled, the current consumption is

reduced to less than 1

µA. The TPS6420x is available in

the 6-pin SOT23 (DBV) package and operates over a free

air temperature range of −40

°C to 85°C.

TYPICAL APPLICATION CIRCUIT

5

TPS64200

Si5447DC

ZHCS2000

EN

GND

FB

SW

VIN

ISENSE

Rs = 33 mΩ

10

µH

3.3 V / 2 A

47

µF

PosCap

6TPA47M

R1

620 k

Ω

R2

360 k

Ω

10

µF

5 V

0

10

20

30

40

50

60

70

80

90

100

0.0001

0.001

0.01

0.1

1

10

TA = 25°C,

VO = 3.3 V

TPS64200

EFFICIENCY

vs

LOAD CURRENT

IO − Load Current − A

VI = 4.2 V

1

2

3

6

4

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.

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.

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Copyright

 2003, Texas Instruments Incorporated