LTC1772CS6 Linear Technology Corporation, LTC1772CS6 Datasheet

LTC1772CS6

Manufacturer Part Number

LTC1772CS6

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC1772BES6-TRPBF.pdf (12 pages)

2.LTC1772CS6.pdf (16 pages)

Specifications of LTC1772CS6

Date_code

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Part Number

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Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC1772CS6

Manufacturer:

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Quantity:

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Quantity:

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

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Part Number:

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LT/凌特

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Company:

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Part Number:

LTC1772CS6#TRPBF

Manufacturer:

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Part Number:

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC1772CS6-TRPBF

Manufacturer:

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Quantity:

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APPLICATIONS

FEATURES

TYPICAL

One or Two Lithium-Ion-Powered Applications

Cellular Telephones

Wireless Modems

Portable Computers

Distributed 3.3V, 2.5V or 1.8V Power Systems

Scanners

High Efficiency: Up to 94%

High Output Currents Easily Achieved

Wide V

Constant Frequency 550kHz Operation

Burst Mode

Low Dropout: 100% Duty Cycle

0.8V Reference Allows Low Output Voltages

Current Mode Operation for Excellent Line and Load

Transient Response

Low Quiescent Current: 270 A

Shutdown Mode Draws Only 8 A Supply Current

Tiny 6-Lead SOT-23 Package

2.5% Reference Accuracy

C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT

C2: SANYO POSCAP 6TPA47M

D1: IR10BQ015

10k

220pF

Range: 2.5V to 9.8V

APPLICATION

Figure 1. High Efficiency Step-Down Converter

Operation at Light Load

GND

/RUN

LTC1772

SENSE

PGATE

–

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

L1: MURATA LQN6C-4R7

M1: Si3443DV

R1: DALE 0.25W

0.03

4.7 H

10 F

16V

47 F

169k

78.7k

DC/DC Controller in SOT-23

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 boasts a 2.5% output voltage accuracy and

consumes only 270 A of quiescent current. For applica-

tions 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% duty cycle). In shutdown, the device draws

a mere 8 A. 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.

DESCRIPTION

Burst Mode is a trademark of Linear Technology Corporation.

1772 F01a

2.5V

TO 9.8V

2.5V

Current Mode Step-Down

OUT

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

1772 is a constant frequency current mode step-

Constant Frequency

100

Final Electrical Specifications

Efficiency vs Load Current

= 3.3V

LOAD CURRENT (mA)

= 9.8V

= 4.2V

September 1999

100

= 8.4V

OUT

SENSE

= 6V

1000

LTC1772

= 2.5V

= 0.03

1772 F01b

10000

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