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MIC2155 Datasheet, PDF (1/33 Pages) Micrel Semiconductor – 2-Phase, Single Output, PWM Synchronous Buck Control IC | |||
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MIC2155/2156
2-Phase, Single Output, PWM
Synchronous Buck Control IC
General 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.
Data sheets and support documentation can be found on
Micrelâs 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 à 5mm MLF®
⢠Junction temperature range of -40°C to +125°C
Applications
⢠Multi-output power supplies with sequencing
⢠DSP, FPGA, CPU and ASIC power supplies
⢠DSL Modems
⢠Telecom and Networking equipment
⢠Servers
MLF and MicroLead Frame are registered trademarks of Amkor Technologies
Micrel Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
May 2009
M9999-052709-A
(408) 944-0800
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