Datasheet > LTC1751-5

LTC1751-5

更新时间： 2024-02-23 11:13:05

品牌	Logo	应用领域
凌特 - Linear		转换器泵
页数	文件大小	规格书
12页	212K
描述
Micropower, Regulated Charge Pump DC/DC Converters

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LTC1751-5 数据手册

LTC1751/LTC1751-3.3/LTC1751-5

Micropower, Regulated

Charge Pump

DC/DC Converters

FEATURES

DESCRIPTIO

The LTC^®1751 family are micropower charge pump DC/

DC converters that produce a regulated output voltage at

up to 100mA. The input voltage range is 2V to 5.5V.

Extremely low operating current (20µA typical with no

load) and low external parts count (one flying capacitor

and two small bypass capacitors at V_INand V_OUT) make

them ideally suited for small, battery-powered applica-

tions.

The LTC1751 family operate as Burst Mode^TMswitched

capacitor voltage doublers to achieve ultralow quiescent

current. They have thermal shutdown capability and can

survive a continuous short circuit from V_OUTto GND. The

PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates

when the output voltage has reached its final value and if

the output has an undervoltage fault condition. The FB pin

of the adjustable LTC1751 can be used to program the

desired output voltage or current. An optional soft-start

capacitor may be used at the SS pin to prevent excessive

inrush current during start-up.

■

5V Output Current: 100mA (V_IN≥ 3V)

■

3.3V Output Current: 80mA (V_IN≥ 2.5V)

■

Ultralow Power: 20µA Quiescent Current

■

Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ

■

No Inductors

■

Short-Circuit/Thermal Protection

■

V_INRange: 2V to 5.5V

■

800kHz Switching Frequency

■

Very Low Shutdown Current: <2µA

■

Shutdown Disconnects Load from V_IN

■

PowerGood/Undervoltage Output

■

Adjustable Soft-Start Time

■

Available in an 8-Pin MSOP Package

APPLICATIO S

■

Li-Ion Battery Backup Supplies

■

Local 3V and 5V Conversion

■

Smart Card Readers

■

PCMCIA Local 5V Supplies

The LTC1751 family is available in an 8-pin MSOP

package.

■

White LED Backlighting

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

Burst Mode is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

Output Voltage vs Input Voltage

5.2

= 50mA

= 1µF

OUT

FLY

Regulated 5V Output from a 2.7V to 5.5V Input

= 10µF

5.1

5.0

4.9

OUT

2.7V

OUT

= 85°C

5V ±4%

10µF

TO 5.5V

= 25°C

≤ 100mA, V ≥ 3V

≤ 50mA, V ≥ 2.7V

OUT

100k

OFF ON

PGOOD

SHDN PGOOD

LTC1751-5

= –40°C

FLY

1µF

–

GND

1751 TA01

= MURATA GRM39X5R105K6.3AJ

FLY

4.8

C1, C2 = MURATA GRM40X5R106K6.3AJ

2.5

3.0

3.5

4.0

4.5

5.0

5.5

INPUT VOLTAGE (V)

1751 TA02

12 3 4 5 6 7...12

中文翻译

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与LTC1751-5相关器件

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LTC1751EMS8-5#TRPBF	Linear	获取价格	LTC1751 - Micropower, Regulated Charge Pump DC/DC Converters; Package: MSOP; Pins: 8; Temp
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