Datasheet > LTC3250

LTC3250

更新时间： 2024-11-09 05:43:51

品牌	Logo	应用领域
凌特 - Linear		转换器电感器
页数	文件大小	规格书
12页	322K
描述
High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

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LTC3250 数据手册

LTC3250-1.5/LTC3250-1.2

High Efficiency, Low Noise,

Inductorless Step-Down

DC/DC Converter

FEATURES

DESCRIPTIO

The LTC^®3250-1.5/LTC3250-1.2 are charge pump step-

down DC/DC converters that produce a 1.5V or 1.2V

regulated output from a 2.7V to 5.5V input. The parts use

switched capacitor fractional conversion to achieve typi-

cal efficiency two times higher than that of a linear regu-

lator. No inductors are required.

■

2.7V to 5.5V Input Voltage Range

■

No Inductors

■

Li-Ion (3.6V) to 1.5V with 81% Efficiency

■

Low Noise Constant Frequency Operation

■

Output Voltages: 1.5V ±4%, 1.2V ±4%

■

Output Current: 250mA

■

Shutdown Disconnects Load from V_IN

A unique constant frequency architecture provides a low

noise regulated output as well as lower input noise

than conventional charge pump regulators.* High

frequency operation (f_OSC= 1.5MHz) simplifies filtering

to further reduce conducted noise. The part also uses

BurstMode^®operationtoimproveefficiencyatlightloads.

■

Low Operating Current: I_Q= 35µA

■

Low Shutdown Current: I_SD< 1µA

■

Oscillator Frequency = 1.5MHz

■

Soft-Start Limits Inrush Current at Turn-On

■

Short-Circuit and Overtemperature Protected

■

Low Profile (1mm) SOT-23 Package

Low operating current (35µA with no load, <1µA in

shutdown) and low external parts count (three small

ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2

ideallysuitedforspaceconstrainedbatterypoweredappli-

cations. The parts are short-circuit and overtemperature

protected, and are available in a low profile (1mm) 6-pin

ThinSOT^TMpackage.

APPLICATIO S

■

Handheld Computers

■

Cellular Phones

Digital Cameras

■

Handheld Medical Instruments

Low Power DSP Supplies

, LTC and LT are registered trademarks of Linear Technology Corporation

Burst Mode is a registered trademark of Linear Technology Corporation

ThinSOT is a trademark of Linear Technology Corporation.

*U.S. Patent #6, 411, 531

■

TYPICAL APPLICATIO

Efficiency vs Input Voltage

(I_OUT= 100mA)

100

Li-Ion to 1.5V Output with Shutdown

1µF

LTC3250-1.5

–

= 1.5V ± 4%

OUT

3.2V TO 4.2V

OUT

100mA

Li-Ion

1µF

LDO

LTC3250-1.5

SHDN

4.7µF

OFF

GND

3250 TA1a

3.0

3.5

4.0

4.5

(V)

5.0

5.5

3250 TA01b

3250fa

12 3 4 5 6 7...12

中文翻译

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与LTC3250相关器件

型号	品牌	获取价格	描述	数据表
LTC3250-1	Linear	获取价格	Switched-Capacitor Voltage Converter with Regulator
LTC3250-1.2	Linear Systems	获取价格	High Voltage, Low Quiescent Current Inverting Charge Pump
LTC3250-1.2	ADI	获取价格	High Voltage Boost Charge Pump
LTC3250-1.2_15	Linear	获取价格	High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter
LTC3250-1.5	Linear Systems	获取价格	High Voltage, Low Quiescent Current Inverting Charge Pump
LTC3250-1.5	ADI	获取价格	High Voltage Boost Charge Pump
LTC3250-1.5_15	Linear	获取价格	High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter
LTC3250ES6-1.2	Linear	获取价格	High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter
LTC3250ES6-1.2#TR	Linear	获取价格	LTC3250 - High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter; Package: SOT
LTC3250ES6-1.2#TRM	Linear	获取价格	LTC3250 - High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter; Package: SOT

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