Microchip MIC22705 Handleiding

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 2020 Microchip Technology Inc. DS20006307A-page 1

MIC22705

Features

• Input Voltage Range: 2.9V to 5.5V

• Output Voltage Adjustable Down to 0.7V

• Output Load Current Up to 7A

• Safe Start-Up into a Pre-Biased Output Load

• Full Sequencing and Tracking Ability

• Power Good Output

• Efficiency >95% Across a Broad Load Range

• Ultra-Fast Transient Response

• Easy RC Compensation

• 100% Maximum Duty Cycle

• Fully Integrated MOSFET Switches

• Thermal Shutdown and Current-Limit Protection

• 24-Pin 4 mm x 4 mm QFN

• –40°C to +125°C Junction Temperature Range

Applications

• High Power Density Point-of-Load Conversion

• Servers, Routers, and Base Stations

• Blu-Ray/DVD Players and Recorders

• Computing Peripherals

• FPGAs, DSP, and Low Voltage ASIC Power

General Description

The MIC22705 is a highly efficient, 7A, integrated

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

MIC22705 is optimized for highest efficiency, achieving

more than 95% efficiency while still switching at 1 MHz

over a broad 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 is

pre-bias safe and can be adjusted down to 0.7V to

address all low-voltage power needs.

The MIC22705 offers a full range of sequencing and

tracking options. The Enable/Delay (EN/DLY) pin,

combined with the Power Good (PG) pin, allows

multiple outputs to be sequenced in any way during

turn-on and turn-off. The Ramp Control (RC) pin allows

the device to be connected to another product in the

MIC22xxx and/or MIC68xxx family, to keep the output

voltages within a certain V on start-up.∆

The MIC22705 is available in a 24-pin 4mm x 4mm

QFN with a junction operating range from –40°C to

+125°C.

Package Type

MIC22705

24-Lead 4 mm x 4 mm QFN (ML)

(Top View)

PVIN

EN/DLY

PVIN

SVIN

SGND

COMP

PVIN

PGND

7 8 9 10 11 12

19202122

2324

1 MHz, 7A Integrated Switch, High Efficiency Synchronous Buck Regulator

MIC22705

DS20006307A-page 2  2020 Microchip Technology Inc.

Typical Application Circuit

PVIN SW

FBPG

22μF

VOUT

1.8V/7A

1.0μH

PGND

47μF

MIC22705

COMP

VIN

2.9V to 5.5V

EN/DLYEN

47.5Nȍ

SGND

20Nȍ

39pF

SVIN

470pF1.0nF

EP R1

1.10Nȍ

69ȍ

Functional Block Diagram

1.0μH

47μF

MIC22705

EN SW

EN/DLY

PGND

SVIN

PVIN VIN

2.9V to 5.5V

22μF

gm EA

COMP

CONTROL

LOGIC

CLOCK

UVLO

THERMAL

SHUTDOWN

PVIN

SGND

47.5Nȍ

VIN

HSD

LSD

40mV

CURRENT

LIMIT

1μA

1.0nF

39pF

20k

1.0nF

240Nȍ 50pF 120Nȍ

120Nȍ

COMP

OPEN

90%

VREF

VOUT

1.8V/7A

1.10Nȍ

69ȍ

1μA

SVIN

VREF

0.7V

1μA

VDD

DELAY

 2020 Microchip Technology Inc. DS20006307A-page 3

MIC22705

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †

PVIN to PGND .............................................................................................................................................. –0.3V to +6V

SVIN to PGND .............................................................................................................................................–0.3V to PV

VSW to PGND..............................................................................................................................................–0.3V to PV

VEN/DLY to PGND ........................................................................................................................................–0.3V to PV

VPG to PGND ..............................................................................................................................................–0.3V to PV

PGND to SGND ........................................................................................................................................ –0.3V to +0.3V

ESD Rating ............................................................................................................................................................ Note 1

Operating Ratings ††

Supply Voltage .......................................................................................................................................... +2.9V to +5.5V

Power Good Voltage (VPG) .............................................................................................................................. 0V to PV

Enable Input (VEN/DLY).....................................................................................................................................0V to PV