LTC1772ES6 Linear Technology Corporation, LTC1772ES6 Datasheet

LTC1772ES6

Manufacturer Part Number

LTC1772ES6

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1772BES6-TRPBF.pdf (12 pages)

2.LTC1772ES6.pdf (12 pages)

Specifications of LTC1772ES6

Date_code

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Part Number

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Quantity

Price

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FEATURES

APPLICATIO S

■

TYPICAL APPLICATIO

C1: TAIYO YUDEN LMK325BJ106K-T

C2A: SANYO 6TPA47M

C2B: AVX 0805ZC105KAT1A

D1: MOTOROLA MBRM120T3

L1: MURATA LQN6C-4R7

M1: FAIRCHILD FDC638P

R1: IRC LRC-LR1206-01-R030F

High Efficiency: Up to 94%

High Output Currents Easily Achieved

Wide V

Constant Frequency 550kHz Operation

Burst Mode

Low Dropout: 100% Duty Cycle

Tiny 6-Lead SOT-23 Package

0.8V Reference Allows Low Output Voltages

Current Mode Operation for Excellent Line and Load

Transient Response

Low Quiescent Current: 270µA

Shutdown Mode Draws Only 8µA Supply Current

±2.5% Reference Accuracy

One or Two Lithium-Ion-Powered Applications

Cellular Telephones

Wireless Modems

Portable Computers

Distributed 3.3V, 2.5V or 1.8V Power Systems

Scanners

10k

220pF

Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator

Range: 2.5V to 9.8V

GND

Operation at Light Load

/RUN

LTC1772

SENSE

PGATE

–

0.03Ω

4.7µH

10µF

10V

C2A

47µF

C2B

1µF

10V

DC/DC Controller in SOT-23

DESCRIPTIO

The LTC

down DC/DC controller providing excellent AC and DC load

and line regulation. The device incorporates an accurate

undervoltage lockout feature that shuts down the LTC1772

when the input voltage falls below 2.0V.

The LTC1772 provides a ±2.5% output voltage accuracy

and consumes only 270µA of quiescent current. For

applications where efficiency is a prime consideration, the

LTC1772 is configured for Burst Mode operation, which

enhances efficiency at low output current.

To further maximize the life of a battery source, the

external P-channel MOSFET is turned on continuously in

dropout (100%dutycycle).In shutdown, the device draws

a mere 8µA. High constant operating frequency of 550kHz

allows the use of a small external inductor.

The LTC1772 is available in a small footprint 6-lead

SOT-23.

Burst Mode is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Current Mode Step-Down

174k

80.6k

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

2.5V

TO 9.8V

2.5V

1772 F01a

OUT

1772 is a constant frequency current mode step-

Constant Frequency

100

= 3.3V

Efficiency vs Load Current

LOAD CURRENT (mA)

= 9.8V

= 4.2V

100

LTC1772

= 8.4V

= 6V

1000

OUT

= 2.5V

1772 F01b

10000

1772fb

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