Datasheet > TC105_13

TC105_13

更新时间： 2024-09-19 12:01:55

品牌	Logo	应用领域
美国微芯 - MICROCHIP		控制器
页数	文件大小	规格书
14页	197K
描述
PFM/PWM Step-Down DC/DC Controller

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中文翻译

获取价格

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TC105_13 数据手册

TC105

PFM/PWM Step-Down DC/DC Controller

Features

Package Type

• 57A (Typ) Supply Current

• 1A Output Current

5-Pin SOT-23A

SHDN

OUT

• 0.5A Shutdown Mode

• 300kHz Switching Frequency for Small Inductor

Size

• Programmable Soft-Start

• 92% Typical Efficiency

TC105

• Small Package: 5-Pin SOT-23A

EXT

GND

Applications

NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A

• Palmtops

• Battery-Operated Systems

• Portable Instruments

• Positive LCD Bias Generators

• Portable Communicators

• Hand-Held Scanners

• 5V to 3V Down Converters

General Description

The TC105 is a step-down (Buck) switching controller

that furnishes output currents of up to 1A (max) while

delivering a typical efficiency of 92%. The TC105

normally operates in pulse width modulation mode

(PWM), but automatically switches to pulse frequency

modulation (PFM) at low output loads for greater

efficiency. Oscillator frequency is 300kHz, allowing use

of small (22H) inductors. Supply current draw is only

102A (max), and is reduced to less than 0.5A when

the SHDN input is brought low. Regulator operation is

suspended during shutdown. The TC105 accepts a

maximum input voltage of 10V.

Device Selection Table

Output

Voltage

(V)*

Osc.

Freq.

(kHz)

Operating

Temp.

Range

Part

Number

Package

TC105503ECT

TC105333ECT

TC105303ECT

5.0

3.3

3.0

5-Pin SOT-23A 300 -40C to +85C

The TC105 is available in a small 5-Pin SOT-23A

package, occupies minimum board space and is ideal

for a wide range of applications.

*Other output voltages are available. Please contact

Microchip Technology Inc. for details.

Functional Block Diagram

L₁22µH (Sumida CD54)

3.3V

V_OUT

R_SS470K

OFF

D₁

MA737

47µF

(From System

Control Logic)

C_SS

0.033µF

10V

Tantalum

V_OUT

SHDN

TC105333ECT

V_DD

EXT

GND

Si 9430

–

V_BATT

NiMH

C₁10µF/16V

3.3V Regulated Supply Using 6V

NiMH Battery Pack Input

 2001-2012 Microchip Technology Inc.

DS21349C-page 1

12 3 4 5 6 7...14

中文翻译

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