Catalog
Dual 1MHz 2.5A PWM Sync Buck Regulator
Key Features
• * 4.5V to 15V input voltage range
• * Adjustable output voltages down to 0.7V
• * 2.5A per channel
• * 180° out of phase operation
• * Pre-biased output startup capability
• * Low-side driver for synchronous operation
• * 2% output voltage accuracy (over temperature)
• * 500kHz (MIC24421) and 1MHz (MIC24420) switching frequency
• * Output voltage sequencing
• * Programmable max current limit
• * Power good output
• * Ramp Control™ provides soft-start
• * Low-side current sensing allows very low duty-cycle
• * Works with ceramic output capacitors
• * Junction temperature range of -40°C to +125°C
Description
AI
The MIC24420/MIC24421 are synchronous PWM dual output step down converters with internal 2.5A high-side switches. The MIC24420/MIC24421 has an integrated low-side gate driver for synchronous step-down conversion by connecting an external N-channel MOSFET to achieve high efficiencies in low duty-cycle applications.
The MIC24420 switching frequency is 1MHz and the MIC24421 switching frequency is 500kHz. A patented control scheme allows the use of a wide range of output capacitance from small ceramic capacitors to large electrolytic types with only one compensation component. A 2% output voltage tolerance over the temperature range allows the maximum level of system performance. The MIC24420/MIC24421 power good signal allows full control for sequencing the output voltages with minimum external components.
An adjustable current limit allows the use of smaller inductors in lower current applications. The MIC24420/MIC24421 has an operating junction temperature range of -40°C to +125°C.
