LTC3445EUF Linear Technology Corporation, LTC3445EUF Datasheet

LTC3445EUF

Manufacturer Part Number

LTC3445EUF

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC3445EUF-PBF.pdf (24 pages)

2.LTC3445EUF.pdf (24 pages)

3.LTC3445EUF.pdf (24 pages)

Specifications of LTC3445EUF

Case

QFN24

Date_code

05+

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC3445EUF

Manufacturer:

Quantity:

10 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LTC3445EUF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC3445EUF#30575#PBF

Manufacturer:

Quantity:

6 859

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC3445EUF#PBF

Manufacturer:

Quantity:

592

Company:

Meier Automation Equipment Co., Limited

Part Number:

LTC3445EUF#PBF

Manufacturer:

LT/凌特

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LTC3445EUF#TRPBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC3445EUF-1#PBF

Manufacturer:

Quantity:

256

Company:

Meier Automation Equipment Co., Limited

Part Number:

LTC3445EUF-1#PBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Current page: 1 of 24
Download datasheet (471Kb)

FEATURES

TYPICAL APPLICATIO

Burst Mode is a registered trademark of Linear Technology Corporation.

PowerPath is a trademark of Linear Technology Corporation.

Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,

6611131, Spread Spectrum patent pending.

APPLICATIO S

Buck Regulator

■

LDOs

■

PowerPath Controller

■

C is a trademark of Philips Electronics N.V.

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

High Efficiency: Up to 93%

600mA Output Current (V

Programmable Output Voltage: 0.85V to 1.55V

2.5V to 5.5V Input Voltage Range

1.5MHz Constant Frequency or Spread Spectrum

Option

Soft-Start

Two LDO Regulators: 0.3V Dropout at 50mA

Dynamically Regulates V

Standard (100kHz) or Fast Mode (400kHz)

24-Lead (4mm × 4mm) QFN Package

Intel’s Microprocessor Supply (PXA27X)

Portable Instruments

_FAULT

20k

COIN

CELL

4.7µF

CC1

CER

BACKUP

PWR_EN

OR GND

C BUS

RUN

SDA

SCL

ADD7

ADD6

PGOOD

TRACK

BACKUP

CC1

BATT

LTC3445

= 3V, V

GND

CC2

BATTFAULT

LDO1FB

LDO2FB

CC1

LDO1

LDO2

BATT

OUT

= 1.3V)

2.2µH

705k

503k

BACKUP

20k

604k

Buck Regulator with Two LDOs

4.7µF

CER

3445 TA01

4.7µF

CER

10µF

CER

10µF

CER

DESCRIPTIO

The LTC

chronous current mode buck regulator, two LDO regula-

tors, a PowerPath

The buck regulator has a 6-bit programmable output range

of 0.85V to 1.55V. Also, the buck regulator uses either a

constant (1.5MHz) or a spread spectrum switching fre-

quency. Using the spread spectrum option allows for a

lower noise regulated output as well as low noise at the

input. In addition, the regulated output voltage slew rate is

programmable via the I

The LTC3445 contains two LDO voltage regulators. The

regulator output voltages are externally resistor program-

mable. Each LDO is capable of delivering up to 50mA.

The LTC3445 contains control circuitry (PowerPath) for

automatic back-up battery selection. V

a coin cell.

Typical supply current during operation is only 360µA and

drops to 27µA in shutdown. The 2.5V to 5.5V input

voltage range makes the LTC3445 ideal for single Li-Ion

battery-powered applications. Automatic Burst Mode

operation increases efficiency at light loads, further ex-

tending battery life.

0.85V

TO 1.55V

1.3V

1.1V

nBATT_FAULT

TYP

3445 contains a high efficiency monolithic syn-

in a 4mm × 4mm QFN

100

controller and an I

0.1

vs Load Current, V

Efficiency and Power Loss

C interface.

C Controllable

DAC MAX

EFFICIENCY

LOAD CURRENT (mA)

DAC MAX

POWER LOSS

DAC MIN

BACKUP

CC1

DAC MIN

100

LTC3445

= 3.6V

interface.

3445 TA01b

is typically

1000

100

1.0

0.1

3445fa

Related parts for LTC3445EUF

Related keywords

LTC3445EUF datasheet
LTC3445EUF data sheet
LTC3445EUF pdf datasheet
LTC3445EUF component
LTC3445EUF part
LTC3445EUF distributor
LTC3445EUF RoHS
LTC3445EUF datasheet download