Datasheet > MIC2172

MIC2172

更新时间： 2024-09-18 14:54:23

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
32页	1892K
描述
The MIC2172 and MIC3172 are complete 100kHz SMPS current-mode controllers with internal 65V 1.

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MIC2172 数据手册

MIC2172/3172

100 kHz, 1.25A Switching Regulators

Features

General Description

• 1.25A, 65V Internal Switch Rating

• 3V to 40V Input Voltage Range

• Current Mode Operation

The MIC2172 and MIC3172 are complete 100 kHz

SMPS current mode controllers with internal 65V 1.25A

power switches. The MIC2172 features external

frequency synchronization or frequency adjustment,

while the MIC3172 features an enable/shutdown

control input.

• Internal Cycle-by-Cycle Current Limit

• Low External Parts Count

• Operates in Most Switching Topologies

• 7 mA Quiescent Current (Operating)

Although primarily intended for voltage step-up

applications, the floating switch architecture of the

MIC2172/3172 makes it practical for step-down,

inverting, and Cuk configurations as well as isolated

topologies.

• <1 μA Quiescent Current, Shutdown Mode

(MIC3172)

• TTL Shutdown Compatibility (MIC3172)

• External Frequency Synchronization (MIC2172)

• External Frequency Trim (MIC2172)

Operating from 3V to 40V, the MIC2172/3172 draws

only 7 mA of quiescent current, making it attractive for

battery-operated supplies.

• Fits Most LT1172 Sockets (see Section 5.0,

Applications Information)

The MIC3172 is for applications that require on/off

control of the regulator. The MIC3172 is externally shut

down by applying a TTL-low signal to EN (enable).

When disabled, the MIC3172 draws only leakage

current (typically less than 1 μA). EN must be high for

normal operation. For applications not requiring

control, EN must be tied to V_INor TTL high.

Applications

• Laptop/Palmtop Computers

• Toys

• Handheld Instruments

• Off-Line Converter up to 50W (Requires External

Power Switch)

The MIC2172 is for applications that require two or

more SMPS regulators that operate from the same

input supply. The MIC2172 features a SYNC input that

allows locking of its internal oscillator to an external

reference. This makes it possible to avoid the audible

beat frequencies that result from the unequal oscillator

frequencies of independent SMPS regulators.

• Predriver for Higher Power Capability

• Master/Slave Configurations (MIC2172)

A reference signal can be supplied by one MIC2172

designated as a master. To ensure locking of the

slave’s oscillators, the reference oscillator frequency

must be higher than the slave. The master MIC2172’s

oscillator frequency is increased up to 135 kHz by

connecting a resistor from SYNC to ground (see

Section 5.0, Applications Information).

The MIC2172/3172 is available in an 8-pin plastic DIP

or SOIC for –40°C to +85°C ambient temperature

operation.

 2019 Microchip Technology Inc.

DS20006208A-page 1

12 3 4 5 6 7...32

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与MIC2172相关器件

型号	品牌	获取价格	描述	数据表
MIC2172_05	MICREL	获取价格	100kHz 1.25A Switching Regulators
MIC2172_06	MICREL	获取价格	100kHz 1.25A Switching Regulators
MIC2172BM	MICREL	获取价格	100kHz 1.25A Switching Regulators Preliminary Information
MIC2172BM	MICROCHIP	获取价格	Switching Regulator, Current-mode, 3.5A, 115kHz Switching Freq-Max, BIPolar, PDSO8, SOIC-8
MIC2172BMT&R	MICREL	获取价格	Switching Regulator, Current-mode, 3.5A, 115kHz Switching Freq-Max, PDSO8, SOIC-8
MIC2172BN	MICREL	获取价格	100kHz 1.25A Switching Regulators Preliminary Information
MIC2172YM	MICREL	获取价格	100kHz 1.25A Switching Regulators
MIC2172YM	MICROCHIP	获取价格	3.5A SWITCHING REGULATOR, 115kHz SWITCHING FREQ-MAX, PDSO8
MIC2172YMTR	MICREL	获取价格	暂无描述
MIC2172YM-TR	MICROCHIP	获取价格	3.5A SWITCHING REGULATOR, 115kHz SWITCHING FREQ-MAX, PDSO8

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