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VERY LOW DROPOUT, LOW

QUIESCENT 500mA REGULATOR

PRELIMINARY - September 11, 2000

SC1563

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

DESCRIPTION

The SC1563 is a high performance positive voltage

regulator designed for use in applications requiring

very low dropout voltage at up to 500 milliamps. Since

it has superior dropout characteristics compared to

regular LDOs, it can be used to supply 2.5V on

motherboards or 2.8V on peripheral cards from the

3.3V supply with no heatsink. Additionally, the SC1563

has a shutdown pin, to further reduce power

dissipation while shut down. The SC1563 provides

excellent regulation over variations in line, load and

temperature.

The SC1563 is available as a five terminal fixed or

adjustable output voltage device with enable. The

device is available in a 5-pin SOT-23 package and an

8-pin MSOP package for higher power dissipation/

lower junction temperature.

FEATURES

鈥?

450mV dropout @ 500mA

鈥?

Designed to operate with ceramic capacitors

鈥?

Adjustable output from 1.200V to 3.3V

鈥?

Multiple output voltage options (all parts also

鈥?

鈥?

鈥?

鈥?

鈥?

adjustable externally using resistors)

Over current and over temperature protection

Enable pin

1碌A(chǔ) quiescent current in shutdown

Low reverse leakage (output to input)

Full industrial temperature range

APPLICATIONS

鈥?

Battery powered systems

鈥?

Motherboards

鈥?

Peripheral cards

鈥?

PCMCIA cards

ORDERING INFORMATION

DEVICE

(1)(2)(3)

PACKAGE

SOT-23-5L

MSOP-8

SC1563ISK-X.XTR

SC1563IMS-X.XTR

TYPICAL APPLICATION

Internally Preset Output Voltage

U1

5

VIN

1

SHDN

C1

VIN

SHDN GND

2

3

SC1563ISK-X.X

VO

4

VO (X.XV)

Notes:

(1) Where -X.X denotes voltage options. Available

voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.1V and 3.3V.

(2) Output voltage can be adjusted using external re-

sistors, see Pin Description.

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

contains 2500 devices (MSOP-8) or 3000 devices

(SOT-23-5L).

Externally Set Output Voltage

U1

5

VIN

1

SHDN

C2

C1

VIN

SHDN GND

2

SC1563ISK-X.X

VO

4

R1

VO

ADJ

ADJ

3

C2

R2

VO

=

1.200 (R1

+

R2)

R2

Volts

1

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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