Specification	MIC38HC44-1YM-TR

Control Features	Frequency Control
Duty Cycle	50 %
Frequency - Switching	500 kHz
Internal Switch(s)	True
Mounting Type	Surface Mount
Operating Temperature [Max]	150 °C
Operating Temperature [Min]	-40 °C
Output Isolation	Isolated
Package / Case	14-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Topology	Flyback, Boost, Forward, Buck
Voltage - Start Up	14.5 V
Voltage - Supply (Vcc/Vdd) [Max]	20 V
Voltage - Supply (Vcc/Vdd) [Min]	9 V

MIC38HC44 Series

20V, Current Mode SMPS Controller Family with Various UVLO and Max Duty Cycle

Part	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Frequency - Switching	Voltage - Start Up	Topology	Supplier Device Package	Output Isolation	Duty Cycle	Package / Case	Package / Case [y]	Package / Case [x]	Control Features	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]
Microchip Technology MIC38HC44YM-TR	150 °C	-40 °C	Surface Mount	500 kHz	14.5 V	Boost Buck Flyback Forward	8-SOIC	Isolated	50 %	8-SOIC	3.9 mm	0.154 in	Frequency Control	20 V	9 V
Microchip Technology MIC38HC44BM TR	150 °C	-40 °C	Surface Mount	500 kHz	14.5 V	Boost Buck Flyback Forward	8-SOIC	Isolated	50 %	8-SOIC	3.9 mm	0.154 in	Frequency Control	20 V	9 V
Microchip Technology MIC38HC44BM-TR	150 °C	-40 °C	Surface Mount	500 kHz	14.5 V	Boost Buck Flyback Forward	8-SOIC	Isolated	50 %	8-SOIC	3.9 mm	0.154 in	Frequency Control	20 V	9 V
Microchip Technology MIC38HC44-1BN	150 °C	-40 °C	Through Hole	500 kHz	14.5 V	Boost Buck Flyback Forward	14-DIP	Isolated	50 %	14-DIP	7.62 mm	0.3 "	Frequency Control	20 V	9 V
Microchip Technology MIC38HC44-1YM-TR	150 °C	-40 °C	Surface Mount	500 kHz	14.5 V	Boost Buck Flyback Forward		Isolated	50 %	14-SOIC	3.9 mm	0.154 in	Frequency Control	20 V	9 V
Microchip Technology MIC38HC44-1BM-TR	150 °C	-40 °C	Surface Mount	500 kHz	14.5 V	Boost Buck Flyback Forward		Isolated	50 %	14-SOIC	3.9 mm	0.154 in	Frequency Control	20 V	9 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	2500	$ 2.71
Microchip Direct	T/R	1	$ 3.59
		25	$ 3.01
		100	$ 2.71
		1000	$ 2.26
		5000	$ 2.08
		10000	$ 1.94
Newark	Each (Supplied on Full Reel)	100	$ 0.82

Description

General part information

MIC38HC44 Series

The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. BiCMOS devices are pin-compatible with 384x bipolar devices. Their high output drive, with fast rise and fall times, combined with low startup current make it an ideal PWM controller where high efficiency is required.

Undervoltage lockout circuitry allows the '42 and '44 versions to start up at 14.5V and operate down to 9V, and the '43 and '45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V.

When compared to bipolar UC384x devices operating from a 15V supply, start-up current has been reduced to 50µA typical and operating current has been reduced to 4.0 mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lower supply voltages. The MIC38HC4x also features a trimmed oscillator discharge current and bandgap reference.