Datasheet > TC105

TC105

更新时间： 2024-09-18 22:42:27

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	434K
描述
PFM/PWM Step-Down DC/DC Controller

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中文翻译

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TC105 数据手册

TC105

PFM/PWM Step-Down DC/DC Controller

Features

Package Type

5-Pin SOT-23A

• 57µA (Typ) Supply Current

• 1A Output Current

SHDN

OUT

• 0.5µA 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 (22µH) inductors. Supply current draw is only

102µA (max), and is reduced to less than 0.5µA 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

22µH (Sumida CD54)

3.3V

OUT

470K

OFF

47µF

(From System

Control Logic)

MA737

10V

0.033µF

Tantalum

SHDN

OUT

TC105333ECT

EXT

GND

Si 9430

–

BATT

10µF/16V

NiMH

3.3V Regulated Supply Using 6V

NiMH Battery Pack Input

2002 Microchip Technology Inc.

DS21349B-page 1

12 3 4 5 6 7...14

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