LTC4057ES5-4.2#TRMPBF Datasheet LTC4057ES5-4.2#TRMPBF, LTC4057ES5-4.2#TRPBF | P10-P12

LTC4057-4.2

4057f

Bypass Capacitor

Many types of capacitors can be used for input bypassing;

however, caution must be exercised when using multi-

layer ceramic capacitors. Because of the self resonant and

high Q characteristics of some types of ceramic capaci-

tors, high voltage transients can be generated under some

start-up conditions, such as connecting the charger input

to a live power source. Adding a 1.5Ω resistor in series

with an X5R ceramic capacitor will minimize start-up

voltage transients. For more information, refer to Applica-

tion Note 88.

Charge Current Soft-Start

The LTC4057 includes a soft-start circuit to minimize the

inrush current at the start of a charge cycle. When charg-

ing begins, the charge current ramps from zero to the full-

scale current over a period of approximately 100µs. This

has the effect of minimizing the transient current load on

the power supply during startup.

APPLICATIO S I FOR ATIO

WUUU

LTC4057-4.2

4057f

S5 Package

5-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1635)

PACKAGE DESCRIPTIO

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.

1.50 – 1.75

(NOTE 4)

2.80 BSC

0.30 – 0.45 TYP

5 PLCS (NOTE 3)

DATUM ‘A’

0.09 – 0.20

(NOTE 3)

S5 TSOT-23 0302

PIN ONE

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.10

0.20 BSC

0.30 – 0.50 REF

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

3.85 MAX

0.62

MAX

0.95

REF

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

1.4 MIN

2.62 REF

1.22 REF

LTC4057-4.2

4057f

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900

●

FAX: (408) 434-0507

●

www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2003

LT/TP 0503 1K • PRINTED IN USA

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TYPICAL APPLICATIO S

800mA Li-Ion Charger with

External Power Dissipation

Basic Li-Ion Battery Charger with

Reverse Polarity Input Protection

0.25Ω

1µF

LTC4057-4.2

BAT

800mA

4057 TA02

PROGSHDN

1.25k

= 5V

GND

ON OFF

1µF

LTC4057-4.2

BAT

4057 TA03

PROG

5V WALL

ADAPTER

GND

500mA

SHDN

ON OFF

P1-P3 P4-P6 P7-P9 P10-P12

LTC4057ES5-4.2#TRMPBF

Mfr. #:

Buy LTC4057ES5-4.2#TRMPBF

Manufacturer:

Analog Devices / Linear Technology

Description:

Battery Management Monolithic Li-Ion Battery Charger w/o term.

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

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LTC4057ES5-4.2#TRMPBF

LTC4057ES5-4.2#TRMPBF

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