Datasheet > TC1142-40EUA

TC1142-40EUA

更新时间： 2024-11-22 22:07:23

品牌	Logo	应用领域
美国微芯 - MICROCHIP		稳压器
页数	文件大小	规格书
12页	421K
描述
Inductorless -2x Boost/Buck Regulator

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TC1142-40EUA 数据手册

TC1142

Inductorless -2x Boost/Buck Regulator

Features

Package Type

• Input Range 2.5V to 5.5V

8-Pin MSOP

• Regulated Output Options from -3.0 to -5.0V

• Output Current 20mA (max)

CCLK

OUT

C2–

C2+

–

• 200kHz Internal Oscillator Frequency

• External Synchronizing Clock Input

• Logic Level Shutdown

TC1142

C1+

GND

- 1µA (max) Supply Current

• Available in 8-Pin MSOP Package

General Description

Applications

The TC1142 generates a regulated negative voltage

from -3V to -5V at 20mA from an input of 2.5V to 5.5V,

using only three external capacitors. Other boost/buck

switching regulators must use an inductor, which is

larger and radiates EMI. An internal voltage

comparator inhibits the charge pump when V_OUTis

more negative than the regulated value (per the

ordering option). The values of flying capacitors C1 and

C2 are chosen to be less than C_OUTin order to reduce

the ripple generated from regulating V_OUTin this

manner. The TC1142 also can be used as a -1x buck

regulator by omitting C2, and connecting the C2 pin to

• Cellular Phones

• Battery Powered/Portable Equipment

Device Selection Table

Output

Voltage Package

(V)*

Operating

Temp.

Range

Part

Number

TC1142-3.0EUA 3.0 8-Pin MSOP -40°C to +85°C

TC1142-4.0EUA 4.0 8-Pin MSOP -40°C to +85°C

TC1142-5.0EUA 5.0 8-Pin MSOP -40°C to +85°C

V_OUT

*Other output voltages are available (-3.5V and -4.5V). Please

contact Microchip Technology Inc. for details.

The part goes into shutdown when the CCLK input is

driven low. When in shutdown mode, the part draws a

maximum of 1µA. When CCLK is pulled high, the part

runs from the internal 200kHz oscillator. The device

may be run with an external clock, provided the

frequency is greater than 3kHz and less than 500kHz.

The TC1142 comes in a space-saving MSOP package.

Functional Block Diagram

–2x Boost/Buck

–1x Buck

5.5V to 3V

5.5V to 2.5V

–

OFF

= -5.0V

= –3.0V

OUT

CCLK

OUT

4.7µF

OSC

OVERRIDE

OSC

OVERRIDE

OUT

0.47µF

TC1142-30

TC1142-50

C2–

GND

 2002 Microchip Technology Inc.

DS21360B-page 1

12 3 4 5 6 7...12

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