Datasheet > LTC3407-2

LTC3407-2

更新时间： 2024-02-19 02:21:54

品牌	Logo	应用领域
凌特 - Linear		稳压器
页数	文件大小	规格书
16页	220K
描述
Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

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中文翻译

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LTC3407-2 数据手册

LTC3407-2

Dual Synchronous, 800mA,

2.25MHz Step-Down

DC/DC Regulator

DESCRIPTIO

FEATURES

The LTC^®3407-2 is a dual, constant frequency, synchro-

nous step down DC/DC converter. Intended for low power

applications, it operates from 2.5V to 5.5V input voltage

range and has a constant 2.25MHz switching frequency,

allowing the use of tiny, low cost capacitors and inductors

with a profile ≤1.2mm. Each output voltage is adjustable

from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A power

switches provide high efficiency without the need for

external Schottky diodes.

■

High Efficiency: Up to 95%

■

Very Low Quiescent Current: Only 40µA

■

2.25MHz Constant Frequency Operation

■

High Switch Current: 1.2A on Each Channel

■

No Schottky Diodes Required

■

Low R_DS(ON)Internal Switches: 0.35Ω

■

Current Mode Operation for Excellent Line

and Load Transient Response

Short-Circuit Protected

■

Low Dropout Operation: 100% Duty Cycle

A user selectable mode input is provided to allow the user

to trade-off noise ripple for low power efficiency. Burst

Mode^®operation provides high efficiency at light loads,

while Pulse Skip Mode provides low noise ripple at light

loads.

■

Ultralow Shutdown Current: I_Q< 1µA

■

Output Voltages from 5V down to 0.6V

■

Power-On Reset Output

■

Externally Synchronizable Oscillator

■

Small Thermally Enhanced MSOP and 3mm × 3mm

To further maximize battery life, the P-channel MOSFETs

are turned on continuously in dropout (100% duty cycle),

and both channels draw a total quiescent current of only

40µA. In shutdown, the device draws <1µA.

DFN Packages

APPLICATIO S

■

PDAs/Palmtop PCs

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

Burst Mode is a registered trademark of Linear Technology Corporation.

■

Digital Cameras

■

Cellular Phones

■

Portable Media Players

■

PC Cards

■

Wireless and DSL Modems

TYPICAL APPLICATIO

= 2.5V*

TO 5.5V

LTC3407-2 Efficiency Curve

100

100k

10µF

RUN2

RUN1

POR

2.5V

MODE/SYNC

RESET

1.8V

LTC3407-2

2.2µH

= 2.5V

OUT2

AT 800mA

= 1.8V

OUT1

SW2

SW1

AT 800mA

C5, 22pF

C4, 22pF

FB1

FB2

887k

604k

GND

10µF

= 3.3V

280k

301k

Burst Mode OPERATION

NO LOAD ON OTHER CHANNEL

100

1000

3407 TA01

C1, C2, C3: TAIYO YUDEN JMK316BJ106ML

L1, L2: MURATA LQH32CN2R2M33

LOAD CURRENT (mA)

*V CONNECTED TO V FOR V ≤ 2.8V

OUT

IN IN

3407 TA02

Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators

sn34072 34072fs

12 3 4 5 6 7...16

中文翻译

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与LTC3407-2相关器件

型号	品牌	获取价格	描述	数据表
LTC3407-3	Linear	获取价格	Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator
LTC3407-3	ADI	获取价格	双路、同步、1.8V/0.8A 和 3.3V/0.8A、2.25MHz 降压型 DC/DC
LTC3407-4	Linear	获取价格	Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator
LTC3407-4	ADI	获取价格	双路、同步、800mA、2.25MHz 降压型 DC/DC 稳压器
LTC3407A	Linear	获取价格	Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator
LTC3407A	ADI	获取价格	双输出同步 600mA、1.5MHz 降压型 DC/DC 稳压器
LTC3407A-2	Linear	获取价格	Dual Synchronous 800mA,2.25MHz Step-Down DC/DC Regulator
LTC3407A-2	ADI	获取价格	双通道同步、800mA、2.25MHz降压型DC/DC稳压器
LTC3407AB	Linear	获取价格	1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
LTC3407AEDD	Linear	获取价格	暂无描述

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