MP28128 datasheet(2/11 Pages) MPS

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MP28128 – 2.5A, 1.5MHz SYNCHRONOUS STEP-DOWN CONVERTER

MP28128 Rev. 0.92

www.MonolithicPower.com

2/13/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PACKAGE REFERENCE

TOP VIEW

GND

EN/SYNC

GND

POK

EXPOSED PAD

ON BACKSIDE

Connect to GND

Part Number*

Package

Temperature

MP28128DQ

QFN10

(3mm x 3mm)

–40

°C to +85°C

* For Tape & Reel, add suffix –Z (eg. MP28128DQ–Z)

For RoHS Compliant Packaging, add suffix –LF

(eg. MP28128DQ–LF–Z)

ABSOLUTE MAXIMUM RATINGS (1)

IN to GND ................................... –0.3V to +6.5V

SW to GND.......................... –0.3V to VIN + 0.3V

SW to GND............ -2.5V to VIN+2.5V for <50nS

FB, EN/SYNC, POK to GND.......... –0.3V to +6.5V

BS to SW .................................... –0.3V to +6.5V

Junction Temperature...............................150°C

Lead Temperature ....................................260°C

Storage Temperature ..............–65°C to +150°C

Recommended Operating Conditions

(2)

Supply Voltage VIN............................. 2.7V to 6V

Output Voltage VOUT ................. 0.8V to 0.9 x VIN

Operating Temperature .............–40°C to +85°C

Thermal Resistance

(3)

θJA

θJC

QFN10 (3mm x 3mm)............. 50 ...... 12...

°C/W

Notes:

1) Exceeding these ratings may damage the device.

2) The device is not guaranteed to function outside of its

operating conditions.

3) Measured on approximately 1” square of 1 oz copper.

ELECTRICAL CHARACTERISTICS (4)

VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.

Parameters

Condition

Min

Typ

Max

Units

Supply Current

VEN = VIN

VFB = 0.85V

750

µA

Shutdown Current

VEN = 0V, VIN = 6V

µA

IN Undervoltage Lockout

Threshold

Rising Edge

2.59

2.69

IN Undervoltage Lockout

Hysteresis

210

TA = +25°C

0.788

0.800

0.812

Regulated FB Voltage

–40°C ≤ TA ≤ +85°C

0.780

0.800

0.820

FB Input Current

VFB = 0.85V

±50

EN High Threshold

–40°C ≤ TA ≤ +85°C

1.6

EN Low Threshold

–40°C ≤ TA ≤ +85°C

0.4

Internal Soft-Start Time

120

µs

High-Side Switch On-Resistance ISW = 300mA

mΩ

Low-Side Switch On-Resistance

ISW = –300mA

mΩ

SW Leakage Current

VEN = 0V; VIN = 6V

VSW = 0V or 6V

–10

µA

BS Under Voltage Lockout

Threshold

1.8

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