Datasheet Microchip MIC2155 — Datenblatt

MIC2155/2156
Two-Phase, Single-Output, PWM
Synchronous Buck Control IC General Description Features The MIC2155 and MIC2156 are a family of two-phase,
single-output synchronous buck control ICs featuring small
size, high efficiency, and a high level of flexibility. The ICs
implement a 500kHz (MIC2155) and 300kHz (MIC2156)
voltage mode PWM control, with the outputs switching
180В° out of phase. The result of the out-of-phase operation
is 1MHz (or 600kHz) input ripple with ripple current
cancellation, minimizing the required input filter
capacitance. A 1% output voltage tolerance allows the
maximum level of system performance. Internal drivers
with adaptive gate drive allow the highest efficiency with
the minimum external components.
Two independent enable pins and a power good output
are provided, allowing a high level of control and
sequencing capability.
The MIC215x family has a junction operating range from
-40В°C to +125В°C. Synchronous buck control ICs with outputs switching
180В° out-of-phase Remote sensing with internal differential amplifier 4.5V to 14.5V input voltage range Adjustable output voltages down to 0.7V 1% output voltage accuracy Starts up into a pre-biased output 500kHz PWM operation (MIC2155) 300kHz PWM operation (MIC2156) Adaptive gate drive allows efficiencies over 95% Adjustable current limit with no sense resistor Senses low-side MOSFET current Internal drivers allow 25A per phase Power Good output allow simple sequencing Dual enables with micro-power shutdown and UVLO Programmable soft-start pin Output over-voltage protection Works with ceramic output capacitors Multi-input supply capability Single-output high-current capability with master/slave
current sharing External synchronization Small footprint 32-pin 5mm Г— 5mm MLFВ® Junction temperature range of -40В°C to +125В°C Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com. Applications Multi-output power supplies with sequencing
DSP, FPGA, CPU and ASIC power supplies …