Datasheet > LTC3252

LTC3252

更新时间： 2024-11-06 14:58:23

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
12页	292K
描述
双通道、低噪声、无电感、降压型 DC/DC 转换器

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中文翻译

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数据手册

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LTC3252 数据手册

LTC3252

Dual, Low Noise,

Inductorless Step-Down

DC/DC Converter

FEATURES

DESCRIPTIO

The LTC^®3252 is a switched capacitor step-down DC/DC

converter that produces two adjustable regulated outputs

from a single 2.7V to 5.5V input. The part uses switched

capacitor fractional conversion to achieve a typical effi-

ciency increase of 50% over that of a linear regulator. No

inductors are required.

■

2.7V to 5.5V Input Voltage Range

■

No Inductors

■

Typical Efficiency 50% Higher than LDOs

■

Spread Spectrum Operation

Low Input and Output Noise

■

Shutdown Disconnects Load from V_IN

■

Dual Adjustable Independent Outputs

A unique constant frequency, spread spectrum architec-

ture provides a very low noise regulated output as well as

low noise at the input. The part also has Burst Mode^®

operationtoprovidehighefficiencyatlowoutputcurrents,

as well as ultralow current shutdown.

(Range: 0.9V to 1.6V)

■

Output Current: 250mA Each Output

■

Low Operating Current: I_IN= 60µA Typ

(35µA with One Output Enabled)

■

Low Shutdown Current: I_IN= 0.01µA Typ

■

Low operating currents (60µA with both outputs enabled,

35µA with one output enabled) and low external parts

count make the LTC3252 ideally suited for space-con-

strained battery-powered applications. The part is short-

circuit and overtemperature protected and is available in a

tiny 4mm × 3mm 12-pin DFN package.

Soft-Start Limits Inrush Current at Turn On

Short Circuit and Over Temperature Protected

Available in 4mm × 3mm 12-Pin DFN Package

APPLICATIO S

■

Handheld Electronic Devices

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

Burst Mode is a registered trademark of Linear Technology Corporation.

■

Cellular Phones

■

Low Voltage Logic Supplies

■

DSP Power Supplies

■

3.3V to 1.5V Conversion

TYPICAL APPLICATIO

1.5V and 1.2V Output Voltages with Shutdown

1.5V/1.2V Efficiency vs Input Voltage

100

(1.5V) = 100mA

(1.2V) = 100mA

OUT

= 1.5V

OUT

EN1

EN2

OUT1

FB1

OFF ON

≤ 250mA

470k

510k

LTC3252-1.5V

1-CELL

Li-ION

OR 3-CELL

NiMH

4.7µF

–

LTC3252-1.2V

LTC3252

1µF

LDO-1.5V

LDO-1.2V

= 1.2V

≤ 250mA

OUT

OUT2

FB2

OUT

261k

510k

4.7µF

GND

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

(V)

3252 TA01

3252 TA01a

3252f

12 3 4 5 6 7...12

中文翻译

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与LTC3252相关器件

型号	品牌	获取价格	描述	数据表
LTC3252EDE	Linear	获取价格	Dual, Low Noise, Inductorless Step-Down DC/DC Converter
LTC3252EDE#PBF	Linear Systems	获取价格	LTC3252 - Dual, Low Noise, Inductorless Step-Down DC/DC Converter; Package: DFN; Pins: 12;
LTC3252EDE#TRPBF	Linear Systems	获取价格	LTC3252 - Dual, Low Noise, Inductorless Step-Down DC/DC Converter; Package: DFN; Pins: 12;
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LTC3255_15	Linear	获取价格	Wide VIN Range Fault Protected 50mA Step-Down Charge Pump
LTC3255EDD#PBF	Linear	获取价格	LTC3255 - Wide VIN Range Fault Protected 50mA Step-Down Charge Pump; Package: DFN; Pins: 1
LTC3255EMSE#PBF	Linear	获取价格	LTC3255 - Wide VIN Range Fault Protected 50mA Step-Down Charge Pump; Package: MSOP; Pins:
LTC3255HDD#PBF	Linear	获取价格	LTC3255 - Wide VIN Range Fault Protected 50mA Step-Down Charge Pump; Package: DFN; Pins: 1
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