PWM Synchronous Buck Controller - Micrel Semiconductor
Description
MIC2155/2156
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Two-Phase, Single-Output, PWM Synchronous Buck Control IC
General Description
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 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.
Data sheets and support documentation can be found on Micrel’s web site at www.
micrel.
com.
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 • 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 × 5mm MLF® • Junction temperature range of -40°C to +125°C
Applications
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