Datasheet > TC115331EMTRT

TC115331EMTRT

更新时间： 2024-11-08 04:58:59

品牌	Logo	应用领域
美国微芯 - MICROCHIP		开关光电二极管
页数	文件大小	规格书
12页	148K
描述
0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5, SOT-89, 5 PIN

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TC115331EMTRT 数据手册

TC115

PFM/PWM Step-up DC/DC Converter

GENERAL DESCRIPTION

FEATURES

The TC115 is a high-efficiency step-up DC/DC con-

verter for small, low input voltage or battery powered sys-

tems. This device has a guaranteed start-up voltage of 0.9V

and a typical supply current of 80 µA. Phase compensation

and soft-start circuitry are included on-chip. Unlike conven-

tional PWM step-up converters, the TC115 automatically

shifts to pulse frequency modulation (PFM) at low loads,

resulting in reduced supply current and improved efficiency.

The TC115 requires only an external diode, an inductor,

and a capacitor, and supports typical output currents of 140

mA.Supplycurrentisreducedtolessthan0.5µA,maxwhen

SHDN input is brought low.

■ High Efficiency at Low Output Load Currents

via PFM Mode

■ Space-Saving SOT-89 Package

■ Guaranteed Start-Up at 0.9V

■ 80 µA (typ.) Supply Current

■ 85% (typ.) Efficiency at 100 mA

■ 140 mA Typical Output Current @ V_IN= 2.0V

■ Low Power Shutdown Mode

■ No External Switching Transistor Needed

TYPICAL APPLICATIONS

■ Pagers

■ Cellular Phones

■ Palmtops

■ 1-Cell to 3-Cell Battery Powered Systems

■ Cameras, Video Recorders

■ Local +3V to +5V Supplies

Small size, low installed cost, and low supply current

make the TC115 step-up converter ideal for use in a wide

range of battery powered systems.

ORDERING INFORMATION

Output

Voltage*

(V)

Osc. Operating

TYPICAL OPERATING CIRCUITS

Part

Number

Freq.

Temp.

Range

Package (KHz)

100 µH

Sumida

CD-54

TC115501EMT 5.0 SOT-89-5 100 – 40 to +85°C

TC115331EMT 3.3 SOT89-5 100 – 40 to +85°C

TC115301EMT 3.0 SOT-89-5 100 – 40 to +85°C

+3V

OUT

IN5817

10 µF

1.5V

47 µF

NOTE: *Other output voltages available. Please contact Microchip

Tantalum

Technology Inc. for details.

GND

TC115

SHDN

1.5V to +3V, 50 mA Supply

TC115-1 4/26/99

12 3 4 5 6 7...12

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