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57碌A(chǔ) (Typ) Supply Current

1A Output Current

0.5碌A(chǔ) Shutdown Mode

300kHz Switching Frequency for Small Inductor

Size

鈥?Programmable Soft-Start

鈥?92% Typical Efficiency

鈥?Small Package: 5-Pin SOT-23A

Package Type

5-Pin SOT-23A

V

OUT

5

SHDN

4

TC105

1

EXT

2

V

DD

3

GND

Applications

鈥?/div>

Palmtops

Battery-Operated Systems

Portable Instruments

Positive LCD Bias Generators

Portable Communicators

Hand-Held Scanners

5V to 3V Down Converters

NOTE:

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

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碌H) inductors. Supply current draw is only

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

the SHDN input is brought low. Regulator operation is

suspended during shutdown. The TC105 accepts a

maximum input voltage of 10V.

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.

Device Selection Table

Part

Number

TC105503ECT

TC105333ECT

TC105303ECT

Output

Voltage

(V)*

5.0

3.3

3.0

Package

5-Pin SOT-23A

Osc.

Freq.

(kHz)

300

Operating

Temp.

Range

-40擄C to +85擄C

*Other output voltages are available. Please contact

Microchip Technology Inc. for details.

Functional Block Diagram

L

1

22碌H (Sumida CD54)

R

SS

470K

D

1

MA737

C

SS

0.033碌F

3.3V

V

OUT

OFF ON

(From System

Control Logic)

5

V

OUT

4

SHDN

C2

47碌F

10V

Tantalum

TC105333ECT

EXT

V

DD

GND

1

2

3

Si 9430

P

+

V

BATT

6V 鈥?/div>

NiMH

C

1

10碌F/16V

3.3V Regulated Supply Using 6V

NiMH Battery Pack Input

2002 Microchip Technology Inc.

DS21349B-page 1

漏

型號(hào)

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