MIC22950

10A Integrated Switch Synchronous

Buck Regulator with Frequency

Programmable to 2MHz

Ramp Control is a trademark of Micrel, Inc

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

February 2010

M9999-021910-B

General Description

The Micrel MIC22950 is a high-efficiency 10A integrated

switch, synchronous buck (step-down) regulator. The

MIC22950 switching frequency is programmable from

400kHz to 2MHz, allowing the customer to optimize

designing either for efficiency or for the smallest footprint.

The MIC22950 achieves over 95% efficiency while still

switching at 2MHz over a broad load range.

The ultra-high-speed control loop keeps the output voltage

within regulation, even under extreme transient load

swings commonly found in FPGAs and low voltage ASICs.

The output voltage can be adjusted down to 0.7V in order

to address all low-voltage power needs.

The MIC22950 features a full range of sequencing and

tracking options. The EN/DLY and the DELAY pins,

combined with the POR/PG pin, allow multiple outputs to

be sequenced in several ways during turn-on and turn-off

by using EN pin. The RC (Ramp Control™) pin allows the

device to be connected to any another device in the

MIC22x00 family of products, to keep the output voltages

within a certain delta V during start-up.

The MIC22950 is available in a 32-pin 5mm x 5mm MLF

®

with a junction operating range from

−40°C to +125°C.

Datasheet and supporting documentation can be found on

Features

• 2.6V to 5.5V supply voltage

• Fully-integrated MOSFET switches

• Adjustable output voltage option down to 0.7V

• Output load current up to 10A

• Full sequencing and tracking capability

• Power-On Reset

• Efficiency >95% across a broad load range

• Operating frequency programmable: 400kHz to 2MHz

• Ultra-fast transient response

• 100% maximum duty cycle

• Micropower shutdown

• Thermal-shutdown and current-limit protection

• −40°C to +125°C junction temperature range

Applications

• High-power density point-of-load conversion

• Base stations, Servers and Routers

• Blu-ray players, DVD Recorders

• Computer Peripherals

• FPGAs, DSP, and low-voltage ASIC power

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Typical Application

MIC22950 10A Synchronous DC-DC Converter

Efficiency vs. Load Current

60

65

70

75

80

85

90

95

100

02

46

8

10

LOAD CURRENT (A)

Sequencing and Tracking