MIC2155 Series

14.5V, Dual Output Synchronous Buck Controller IC, 500 KHZ

Catalog

14.5V, Dual Output Synchronous Buck Controller IC, 500 KHZ

Part	Supplier Device Package	Topology	Mounting Type	Output Configuration	Clock Sync	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Function	Output Type	Synchronous Rectifier	Control Features	Output Phases	Frequency - Switching	Package / Case	Number of Outputs	Duty Cycle (Max)
Microchip Technology MIC2155YML-TR	32-QFN (5x5)	Buck	Surface Mount	Positive		-40 °C	125 ¯C	4.5 V	14.5 V	Step-Down	Transistor Driver		Current Limit Enable Power Good Soft Start	2	500 kHz	32-VFQFN Exposed Pad	2	80 %

Catalog

14.5V, Dual Output Synchronous Buck Controller IC, 500 KHZ

Key Features

• + Synchronous Buck Control ICs with outputs switching 180° 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

Description

The MIC2155 and MIC2156 are a family of 2-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 180° 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 -40°C to +125°C.