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LOW VOLTAGE, BOOST DC-DC

CONTROLLER

August 22, 2000

SC1408

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

DESCRIPTION

The SC1408 is a low voltage boost controller that oper-

ates from a 1.8V to 16.5V input range. A shutdown pin

allows the user to turn the controller off reducing sup-

ply current to less than 2碌A typical. Output voltage can

be preset to 5V or is adjustable from 3V to 16.5V with

a resistor divider. The controller changes frequency in

low load conditions to improve efficiency.

The SC1408 was designed for two cell Alkaline or sin-

gle cell Lithium Ion battery applications. With the

proper external components it can be used as a boost

converter or a buck/boost converter.

A current sense is implemented with an external resis-

tor that is not in the load current path.

The SC1408 operates in 鈥渂ootstrapped鈥?mode. When

the input voltage to the device is less than 2.5V during

startup, a low voltage 50% fixed duty cycle oscillator is

switched in to initiate boost action.

FEATURES

鈥?

1.8V to 16.5V input range

鈥?

Up to 10W output power

鈥?

Preset 5V or adjustable output

鈥?

Up to 300kHz switching frequency

鈥?

10碌A max shutdown current

鈥?

Industrial temperature range

鈥?

SO-8 or MSOP-8 package

APPLICATIONS

鈥?

PDA Power supplies

鈥?

Battery powered applications

鈥?

Positive LCD Bias generator

鈥?

Portable communications (cellular phones)

鈥?

Peripheral card supplies

鈥?

Industrial power supplies

ORDERING INFORMATION

Part Number

(1)

Package

SO-8

MSOP-8

Temp. Range (T

A

)

-40擄 to +85擄C

SC1408IS.TR

SC1408IMS.TR

Note:

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

contains 2500 devices.

TYPICAL APPLICATION - BOOST CONFIGURATION

Vin (1.8V to 16.5V)

L1

D1

Vout (3V to 16.5V)

U1

2

4

+

5

C2

7

BST

GATE

Q1

1

8

R3

SHDN ISENSE

REF

GND

FB

AGND

+

3

6

R2

R4

C3

SC1408IS

C5

1

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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