LT1931ES5 Linear Technology Corporation, LT1931ES5 Datasheet

LT1931ES5

Manufacturer Part Number

LT1931ES5

Description

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1931ES5.pdf (12 pages)

Specifications of LT1931ES5

Case

SOT-153

Date_code

2008+

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FEATURES

■

TYPICAL APPLICATIO

■

APPLICATIO S

Fixed Frequency 1.2MHz/2.2MHz Operation

Very Low Noise: 1mV

– 5V at 350mA from 5V Input

–12V at 150mA from 5V Input

Uses Small Surface Mount Components

Wide Input Range: 2.6V to 16V

Low Shutdown Current: <1µA

Low V

Pin-for-Pin Compatible with the LT1611

Low Profile (1mm) ThinSOT

Disk Drive MR Head Bias

Digital Camera CCD Bias

LCD Bias

GaAs FET Bias

Local Low Noise/Low Impedance Negative Supply

CESAT

C1: TAIYO YUDEN X5R JMK212BJ475MG

C2: TAIYO YUDEN X5R LMK212BJ105MG

C3: TAIYO YUDEN X5R JMK325BJ226MM

D1: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CLS62-100

Figure 1. 5V to –5V, 350mA Inverting DC/DC Converter

4.7µF

Switch: 400mV at 1A

SHDN

LT1931

10µH

GND

L1A

P-P

NFB

Output Ripple

Package

29.4k

10k

1µF

220pF

10µH

L1B

DC/DC Converters in ThinSOT

1931 F01

22µF

–5V

350mA

OUT

DESCRIPTIO

The LT

inverting SOT-23 current mode DC/DC converters. Both

parts include a 1A integrated switch allowing high current

outputs to be generated in a small footprint. The LT1931

switches at 1.2MHz while the LT1931A switches at 2.2MHz.

These high speeds enable the use of tiny, low cost

capacitors and inductors 2mm or less in height. The

LT1931 is capable of generating – 5V at 350mA or –12V

at 150mA from a 5V supply, while the LT1931A can

generate –5V at 300mA using significantly smaller induc-

tors. Both parts are easy pin-for-pin upgrades for higher

power LT1611 applications.

The LT1931/LT1931A operate in a dual inductor inverting

topology that filters both the input side and output side

current. Very low output voltage ripple approaching 1mV

can be achieved when ceramic output capacitors are used.

Fixed frequency switching ensures a clean output free

from low frequency noise typically present with charge

pump solutions. The low impedance output remains within

1% of nominal during large load steps. The 36V switch

allows V

The LT1931/LT1931A are available in the 5-lead ThinSOT

package.

trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a

1.2MHz/2.2MHz Inverting

1931/LT1931A are the industry’s highest power

to V

OUT

100

differential of up to 34V.

100

LOAD CURRENT (mA)

LT1931/LT1931A

Efficiency

150

200

250

300

1931 TA01

350

1931fa

P-P

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