Datasheet > LTC3240-3.3_15

LTC3240-3.3_15

更新时间： 2024-11-06 01:23:07

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
12页	213K
描述
3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter

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中文翻译

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数据手册

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LTC3240-3.3_15 数据手册

LTC3240-3.3/LTC3240-2.5

3.3V/2.5V Step-Up/

Step-Down Charge Pump

DC/DC Converter

DESCRIPTIO

FEATURES

■

Step-Up/Step-Down Charge Pumps Generate Fixed

The LTC 3240-3.3/LTC3240-2.5 are step-up/step-down

3.3V or 2.5V Outputs

Output Current up to 150mA

Automatic Mode Switching

Constant Frequency (1.2MHz) Operation in

Step-Up Mode

Low Dropout Regulator Operation in

Step-Down Mode

Low No-Load Quiescent Current: I = 65µA

Built-In Soft-Start Reduces Inrush Current

Shutdown Disconnects Load from Input

Shutdown Current < 1µA

charge pump DC/DC converters that produce a ﬁxed

regulated output voltage of 3.3V or 2.5V over a wide input

voltage range (1.8V to 5.5V).

■

V Range: 1.8V to 5.5V

■

With input voltages greater than the regulated output

voltage the LTC3240 operates as a low dropout regulator.

Oncetheinputvoltagedropswithin100mVoftheregulated

output voltage the part automatically switches to step-up

mode.Instep-upmodetheLTC3240operatesasaconstant

frequency (1.2MHz) doubling charge pump.

■

TheLTC3240-3.3/LTC3240-2.5featurelownoloadoperat-

ing current (65µA typical) and ultralow operating current

in shutdown (<1µA). Built-in soft-start circuitry prevents

excessive inrush current during start-up. Thermal shut-

down and current-limit circuitry allow the parts to survive

Short-Circuit/Thermal Protection

Available in a 6-Lead (2mm × 2mm) DFN Package

a continuous short-circuit from V

to GND.

OUT

APPLICATIO S

The LTC3240-3.3/LTC3240-2.5 require only three tiny

external ceramic capacitors for an ultrasmall application

footprint.TheLTC3240-3.3/LTC3240-2.5areavailableina

6-pin (2mm × 2mm) DFN package.

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

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6411531.

■

2 AA to 2.5V

■

2-3 AA/Li-Ion to 3.3V

■

Low Power Supplies for Cameras, I/O Supplies,

Audio, PC Cards, Misc. Logic, etc., in a Wide Variety

of Handheld Products

TYPICAL APPLICATIO

Output Voltage vs Input Voltage (Full Range)

Li-Ion to 3.3V at Up to 150mA

3.50

= 30mA

OUT

1µF

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

–

3.3V

2.7V TO 4.5V

OUT

= 150mA

OUT

Li-Ion OR

3-CELL NiMH

1µF

LTC3240-3.3

GND

4.7µF

OFF ON

SHDN

3240 TA01a

3.7 4.2

INPUT VOLTAGE (V)

1.7 2.2 2.7 3.2

4.7 5.2 5.7

3240 TA01b

3240fb

12 3 4 5 6 7...12

中文翻译

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与LTC3240-3.3_15相关器件

型号	品牌	获取价格	描述	数据表
LTC3240EDC-2.5	Linear	获取价格	3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter
LTC3240EDC-2.5#PBF	Linear	获取价格	LTC3240 - 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter; Package: DFN; Pins: 6;
LTC3240EDC-2.5#TR	Linear	获取价格	暂无描述
LTC3240EDC-2.5#TRM	Linear	获取价格	LTC3240 - 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter; Package: DFN; Pins: 6;
LTC3240EDC-2.5#TRMPBF	Linear	获取价格	LTC3240 - 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter; Package: DFN; Pins: 6;
LTC3240EDC-2.5#TRPBF	Linear	获取价格	暂无描述
LTC3240EDC-3.3	Linear	获取价格	3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter
LTC3240EDC-3.3#PBF	Linear	获取价格	暂无描述
LTC3240EDC-3.3#TR	Linear	获取价格	LTC3240 - 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter; Package: DFN; Pins: 6;
LTC3240EDC-3.3#TRM	Linear	获取价格	暂无描述

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