MIC38HC42/3/4/5
Micrel
MIC38HC42/3/4/5
BiCMOS 1A Current-Mode PWM Controllers Final Information
General Description
T...
MIC38HC42/3/4/5
Micrel
MIC38HC42/3/4/5
Bi
CMOS 1A Current-Mode PWM Controllers Final Information
General Description
The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel’s Bi
CMOS 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. Under
voltage 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 µA 15V supply, start-up current has been reduced to 50 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. MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC packages. 8-pin devices feature small size, while 14-pin devices separate the analog and power connections for improved performance and power dissipation.
Features
Fast 20ns output rise and 15ns output fall times –40°C to +85°C temperature range exceeds UC284x specifications High-performance, low-power Bi
CMOS Process Ultralow start-up current (50µA t...