LT1765EFEPBF Linear Technology Corporation, LT1765EFEPBF Datasheet

LT1765EFEPBF

Manufacturer Part Number

LT1765EFEPBF

Description

TSSOP16

Manufacturer

Linear Technology Corporation

Datasheets

1.LT1765EFEPBF.pdf (20 pages)

2.LT1765EFEPBF.pdf (20 pages)

Specifications of LT1765EFEPBF

Date_code

10+

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

3A Switch in a Thermally Enhanced 16-Lead

TSSOP or 8-Lead SO Package

Constant 1.25MHz Switching Frequency

Wide Operating Voltage Range: 3V to 25V

High Efﬁ ciency 0.09Ω Switch

1.2V Feedback Reference Voltage

Uses Low Proﬁ le Surface Mount Components

Low Shutdown Current: 15μA

Synchronizable to 2MHz

Current Mode Loop Control

Constant Maximum Switch Current Rating at

All Duty Cycles*

Available in 8-Lead SO and 16-Lead Thermally

Enhanced TSSOP Packages

DSL Modems

Portable Computers

Regulated Wall Adapters

Battery-Powered Systems

Distributed Power

INPUT

CERAMIC

2.2μF

OFF

5V to 3.3V Step-Down Converter

SHDN

SYNC

LT1765-3.3

BOOST

GND

0.18μF

2.2nF

UPS120

Step-Down Switching Regulator

CMDSH-3

1.5μH

DESCRIPTION

The LT

regulator. A high efﬁ ciency 3A, 0.09Ω switch is included

on the die together with all the control circuitry required

to construct a high frequency, current mode switching

regulator. Current mode control provides fast transient

response and excellent loop stability.

New design techniques achieve high efﬁ ciency at high

switching frequencies over a wide operating voltage

range. A low dropout internal regulator maintains con-

sistent performance over a wide range of inputs from

24V systems to Li-Ion batteries. An operating supply

current of 1mA improves efﬁ ciency, especially at lower

output currents. Shutdown reduces quiescent current to

15μA. Maximum switch current remains constant at all

duty cycles. Synchronization allows an external logic level

signal to increase the internal oscillator into the range of

1.6MHz to 2MHz.

Full cycle-by-cycle current control and thermal shutdown

are provided. High frequency operation allows the reduc-

tion of input and output ﬁ ltering components and permits

the use of chip inductors.

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

*Patent Pending

1765 TA01

4.7μF

CERAMIC

LT1765/LT1765-1.8/LT1765-2.5/

OUTPUT

3.3V

2.5A

Monolithic 3A, 1.25MHz

1765 is a 1.25MHz monolithic buck switching

LT1765-3.3/LT1765-5

Efﬁ ciency vs Load Current

0.5

SWITCH CURRENT (A)

1.0

1.5

OUT

= 10V

1765 • TAO1a

= 5V

2.0

1765fd

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