MIC2178

更新时间： 2024-11-10 22:46:15

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
16页	172K
描述
2.5A Synchronous Buck Regulator

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MIC2178 数据手册

MIC2178

Micrel

MIC2178

2.5A Synchronous Buck Regulator

General Description

Features

The Micrel MIC2178 is a 200kHz synchronous buck (step-

down) switching regulator designed for high-efficiency, bat-

tery-powered applications.

• 4.5V to 16.5V input voltage range

• Dual-mode operation for high efficiency (up to 96%)

PWM mode for > 200mA load current

Skip mode for < 200mA load current

• 100mΩ internal power MOSFETs at 12V input

• 200kHz preset switching frequency

• Low quiescent current

The MIC2178 operates from a 4.5V to 16.5V input and

features internal power MOSFETs that can supply up to 2.5A

output current. It can operate with a maximum duty cycle of

100% for use in low-dropout conditions. It also features a

shutdown mode that reduces quiescent current to less than

5µA.

1.0mA in PWM mode

600µA in skip mode

< 5µA in shutdown mode

The MIC2178 achieves high efficiency over a wide output

current range by operating in either PWM or skip mode. The

operating mode is externally selected, typically by an intelli-

gentsystem, whichchoosestheappropriatemodeaccording

to operating conditions, efficiency, and noise requirements.

The switching frequency is preset to 200kHz and can be

synchronized to an external clock signal of up to 300kHz.

• Current-mode control

Simplified loop compensation

Superior line regulation

• 100% duty cycle for low dropout operation

• Current limit

• Thermal shutdown

• Undervoltage lockout

TheMIC2178usescurrent-modecontrolwithinternalcurrent

sensing. Current-mode control provides superior line regula-

tion and makes the regulator control loop easy to compen-

sate. The output is protected with pulse-by-pulse current

limiting and thermal shutdown. Undervoltage lockout turns

the output off when the input voltage is less than 4.5V.

Applications

• High-efficiency, battery-powered supplies

• Buck (step-down) dc-to-dc converters

• Palmtop computers

• Laptop computers

• Cellular telephones

• Hand-held instruments

• Battery Chargers

TheMIC2178and ispackagedina20-leadwidepowerSOIC

package with an operating temperature range of –40°C to

+85°C.

See the MIC2177 for automatic selection of PWM or skip-

mode operation.

Typical Application

V_IN

6V to 16.5V

22µF

35V

22µF

35V

5V Output

Efficiency

100

20k

1,2,9

VIN

33µH

3,8

V_OUT

5V/2.5A

V_IN= 6V

PGND

MBRS140

OUTPUT GOOD

PWRGD

OUTPUT LOW

4–7

220µF

10V

MIC

220µF

10V

2178-5.0

SKIP MODE

PWM MODE

PWM

SYNC

COMP

SGND

BIAS

SKIP

PWM

14–17

15k

100

1000 2500

0.01µF

OUTPUT CURRENT (mA)

10nF

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

June 1998

MIC2178

12 3 4 5 6 7...16

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与MIC2178相关器件

型号	品牌	获取价格	描述	数据表
MIC2178_05	MICREL	获取价格	2.5A Synchronous Buck Regulator
MIC2178-3.3BWM	MICREL	获取价格	2.5A Synchronous Buck Regulator
MIC2178-3.3BWM	ROCHESTER	获取价格	6A SWITCHING REGULATOR, 240kHz SWITCHING FREQ-MAX, PDSO20, SOIC-20
MIC2178-3.3BWM	MICROCHIP	获取价格	Switching Regulator, Current-mode, 6A, 240kHz Switching Freq-Max, PDSO20, SOIC-20
MIC2178-3.3CWM	MICROCHIP	获取价格	5.5A SWITCHING REGULATOR, 200kHz SWITCHING FREQ-MAX, PDSO20
MIC2178-3.3CWMT&R	MICROCHIP	获取价格	5.5A SWITCHING REGULATOR, 200kHz SWITCHING FREQ-MAX, PDSO20
MIC2178-3.3YWM	MICROCHIP	获取价格	2.5A Synchronous Buck Regulator
MIC2178-5.0BWM	ROCHESTER	获取价格	6A SWITCHING REGULATOR, 240kHz SWITCHING FREQ-MAX, PDSO20, SOIC-20
MIC2178-5.0BWM	MICROCHIP	获取价格	Switching Regulator, Current-mode, 6A, 240kHz Switching Freq-Max, PDSO20, SOIC-20
MIC2178-5.0BWM	MICREL	获取价格	2.5A Synchronous Buck Regulator

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