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Micrel Semiconductor

MIC2150 Datasheet Preview

MIC2150 Datasheet

2-Phase Dual Output PWM Synchronous Buck Control IC

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MIC2150/MIC2151
2-Phase Dual Output PWM Synchronous
Buck Control IC
General Description
Features
The MIC2150/1 are simple 2-phase dual-output
synchronous buck control ICs featuring small size and high
efficiency. The ICs implement PWM control at 500kHz
(MIC2150) or 300kHz (MIC2151), with the outputs
switching 180° out of phase. The result of the out-of-phase
operation is 1MHz input ripple frequency 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.
A dual threshold enable pin, matched soft-start pins, and a
power good output are provided, allowing a high level of
control.
Dual Synchronous Buck Control IC with outputs
switching 180 degree out-of-phase
4.5V to 14.5V input voltage range
Adjustable output voltages down to 0.7V
1% output voltage accuracy
MIC2150: 500kHz PWM operation
MIC2151: 300kHz PWM operation
Adaptive gate drive allows efficiencies over 95%
Adjustable current limit with no sense resistor
- Senses low-side MOSFET current
Internal drivers allow 20A per phase
Power Good output allow simple sequencing
The MIC2150/1 are available in the small size 4mm×4mm
24-pin MLF® package. The MIC2150/1 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.
Applications
Dual threshold enable pin
Independent programmable soft-start pins
Output over-voltage protection
Input UVLO
Works with ceramic output capacitors
Tiny 4mm×4mm 24-Pin MLF® package
Multi-output power supplies with sequencing
Junction temperature range of -40°C to +125°C
DSP, FPGA, CPU and ASIC power supplies
Telecom and Networking equipment
Servers
_________________________________________________________________________________________________________________________
Typical Application
MicroLead Frame and MLF are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2009
M9999-082809-A
(408) 944-0800




Micrel Semiconductor

MIC2150 Datasheet Preview

MIC2150 Datasheet

2-Phase Dual Output PWM Synchronous Buck Control IC

No Preview Available !

Micrel, Inc.
Ordering Information
Part Number
Frequency
MIC2150YML
MIC2151YML
500kHz
300kHz
Voltage
Adj.
Adj.
Junction Temp.
Range
–40°C to +125°C
–40°C to +125°C
Lead Finish
Pb-Free
Pb-Free
MIC2150
Package
4mm×4mm 24-pin MLF®
4mm×4mm 24-pin MLF®
Pin Configuration
24-Pin MLF® (ML)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
BS1
HSD1
SW1
CS1
SS1
COMP1
AGND
FB1
AVDD
FB2
PGOOD
COMP2
Pin Function
Boost 1(Input): Provides voltage for high-side MOSFET driver 1. The gate drive
voltage is higher than the source voltage by VDD minus a diode drop.
High-Side Drive 1 (Output): High current output-driver for ext. high-side
MOSFET.
Switch Node 1(Output): High current output driver return for HSD1.
Current Sense 1 (Input): Current-limit comparator non-inverting input. The
current limit is sensed across the low-side FET during the ON-time. Current limit
is set by the resistor in series with the CS1 pin.
Soft-start, Output 1(Input): Controls the turn-on time of the output voltage. Active
at power-up, Enable and Current Limit recovery.
Compensation 1 (Input): Pin for external compensation, Channel 1.
Analog Ground (Signal): Signal path return for FB, EN, PGOOD, AVDD, SS and
COMP.
Feedback 1 (Input): Input to Channel 1 error amplifier. Regulates to 0.7V.
Analog Supply Voltage (Input): Connect ext. bypass capacitor.
Feedback 2 (Input): Input to Channel 2 error amplifier. Regulates to 0.7V.
Power Good (Output): Indicates Channel 1 output AND Channel 2 output > 90%
Nominal.
Compensation 2 (Input): Pin for external compensation, Channel 2.
August 2009
2 M9999-082809-A
(408) 944-0800


Part Number MIC2150
Description 2-Phase Dual Output PWM Synchronous Buck Control IC
Maker Micrel Semiconductor
Total Page 27 Pages
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