Datasheet > MIC2179_09

MIC2179_09

更新时间： 2024-01-23 09:40:07

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
13页	354K
描述
1.5A Synchronous Buck Regulator

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MIC2179_09 数据手册

Micrel, Inc.

MIC2179

1.5A Synchronous Buck Regulator

General Description

Features

The Micrel MIC2179 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 > 150mA load current

Skip mode for <150mA load current

• 150mΩ internal power MOSFETs at 12V input

• 200kHz preset switching frequency

• Low quiescent current

TheMIC2179operatesfroma4.5Vto16.5Vinputandfeatures

internal power MOSFETs that can supply up to 1.5A 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 MIC2179 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 intel-

ligentsystem,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

TheMIC2179usescurrent-modecontrolwithinternalcurrent

sensing. Current-mode control provides superior line regula-

tionandmakestheregulatorcontrolloopeasytocompensate.

The output is protected with pulse-by-pulse current limiting

andthermalshutdown. Undervoltagelockoutturnstheoutput

off when the input voltage is less than 4.5V.

• Undervoltage lockout

Applications

• High-efﬁciency, battery-powered supplies

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

• Cellular telephones

• Laptop computers

• Hand-held instruments

• Battery Charger

The MIC2179 and is packaged in a 20-lead SSOP package

with an operating temperature range of –40°C to +85°C.

Typical Application

V_IN

5.4V to 16.5V

10µF

16,17

20V

VIN

20k

22µH

3,4

V_OUT

PGND

3.3V/600mA

Output Good

Output Low

MBRM120

PWRGD

1,2,

MIC

2179-3.3

19,20

100µF

6.3V

Skip Mode

PWM Mode

PWM

SYNC

COMP

SGND

9–12

BIAS

0.01µF

4.02k

Pins 4 and 18 are not connected.

6.8nF

Pins 3 and 4 can be connected

together for a low-impedance

connection.

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

June 2009

M9999-063009

12 3 4 5 6 7...13

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与MIC2179_09相关器件

型号	品牌	获取价格	描述	数据表
MIC2179-3.3BSM	MICREL	获取价格	1.5A Synchronous Buck Regulator
MIC2179-3.3BSMT&R	MICROCHIP	获取价格	Switching Regulator, Current-mode, 5.5A, 240kHz Switching Freq-Max, PDSO20, MO-150, SSOP-2
MIC2179-3.3YSM	MICREL	获取价格	1.5A Synchronous Buck Regulator
MIC2179-3.3YSM	ROCHESTER	获取价格	5.5A SWITCHING REGULATOR, 240kHz SWITCHING FREQ-MAX, PDSO20, LEAD FREE, MO-150, SSOP-20
MIC2179-3.3YSM	MICROCHIP	获取价格	5.5A SWITCHING REGULATOR, 240kHz SWITCHING FREQ-MAX, PDSO20
MIC2179-3.3YSM-TR	MICROCHIP	获取价格	5.5A SWITCHING REGULATOR, 240kHz SWITCHING FREQ-MAX, PDSO20
MIC2179-5.0BSM	MICROCHIP	获取价格	Switching Regulator, Current-mode, 5.5A, 240kHz Switching Freq-Max, PDSO20, MO-150, SSOP-2
MIC2179-5.0BSM	MICREL	获取价格	1.5A Synchronous Buck Regulator
MIC2179-5.0BSMT&R	MICROCHIP	获取价格	Switching Regulator, Current-mode, 5.5A, 240kHz Switching Freq-Max, PDSO20, MO-150, SSOP-2
MIC2179-5.0YSM	MICREL	获取价格	1.5A Synchronous Buck Regulator

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