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HIGH OUTPUT CURRENT

CHARGE PUMP DOUBLER

October 20, 2000

SC1462

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The SC1462 is a versatile charge pump designed for

use in battery operated power supply applications over

the wide input range of 1.65 to 5.5 volts. A simple, low

quiescent current charge pump doubler can be imple-

mented without costly inductors or capacitors. Internal

MOSFETs and control circuitry eliminate the need for

costly board space and design time. The small 6 lead

SOT-23 package helps minimize board space.

The SC1462 charge pump can be used for applica-

tions that require up to 80mA of output current with V

IN

= 2.5V to 5.5V. Typical dropout voltage (2*Vin-Vout) is

shown below for several values of Vin.

T ypical Dropou t Voltage vs Iou t

@T a = 25 D eg. C .

0.9

0.8

Vin = 1.5V

Vin = 2.5V

Vin = 3.6V

Vin = 4.5V

Vin = 5.5V

FEATURES

鈥?

Input supply voltage range of 1.65V to 5.5V

鈥?

Small size - 6 pin SOT-23 package

鈥?

Typical efficiency of :

鈥?

鈥?

鈥?

鈥?

鈥?

鈥?

91% @ Vin = 2.5V, Iout = 45mA

94% @ Vin = 3.6V, Iout = 55mA

Short circuit and over-temperature protection

140碌A(chǔ) typical input current @ no load

Shutdown current <1碌A(chǔ)

Designed to work with ceramic or Tantalum

capacitors

Fixed frequency of 160kHz

All specifications rated over full temperature

range (-40擄C to 85擄C)

APPLICATIONS

鈥?

Cellular phones

鈥?

Handheld devices

Ou tpu t D ropou t Voltage (V)

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

000E+0

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

SOT-23-6

Temp. Range (T

A

)

-40擄C to 85擄C

SC1462ISKTR

20E-3

40E-3

60E-3

80E-3

100E-3

Note:

(1) Only available in tape and reel packaging. A reel

contains 3000 devices.

Iou t (A)

TYPICAL APPLICATION SCHEMATIC

1

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

next

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