MP2351 datasheet(2/8 Pages) MPS

2 / 8 page

MP2351 – 1.5A, 23V, 1.4MHz STEP-DOWN CONVERTER

MP2351 Rev. 1.5

www.MonolithicPower.com

1/6/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PACKAGE REFERENCE

MP2351_PD01-QFN10

TOP VIEW

SYNC

COMP

GND

EXPOSED PAD

ON BACKSIDE

CONNECT TO

GROUND (PIN 6)

Part Number*

Package

Temperature

MP2351DQ

QFN10

(3mm x 3mm)

–40

°C to +85°C

* For Tape & Reel, add suffix –Z (eg. MP2351DQ–Z)

For Lead Free, add suffix –LF (eg. MP2351DQ –LF–Z)

SYNC

COMP

GND

TOP VIEW

MP2351_PD01-MSOP10

Part Number*

Package

Temperature

MP2351DK

MSOP10

–40

°C to +85°C

* For Tape & Reel, add suffix –Z (eg. MP2351DK–Z)

For Lead Free, add suffix –LF (eg. MP2351DK –LF–Z)

ABSOLUTE MAXIMUM RATINGS

(1)

Supply Voltage (VIN)..................................... 25V

Switch Voltage (VSW).................................... 26V

Bootstrap Voltage (VBS) ....................... VSW + 6V

Feedback Voltage (VFB) .................–0.3V to +6V

Enable/UVLO Voltage (VEN)...........–0.3V to +6V

Comp Voltage (VCOMP) ...................–0.3V to +6V

Sync Voltage (VSYNC)......................–0.3V to +6V

Junction Temperature.............................+150

°C

Lead Temperature ..................................+260

°C

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

°C

Recommended Operating Conditions

(2)

Supply Voltage (VIN) ...................... 4.75V to 23V

Operating Temperature.................–40

°C to +85°C

Thermal Resistance

(3)

θJA

θJC

QFN10 (3x3)........................... 50 ...... 12...

°C/W

MSOP10 ................................ 150 ..... 65...

°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

VIN = 12V, TA = +25°C, unless otherwise noted.

Parameter

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

VFB

4.75V

≤ VIN ≤ 23V

1.195

1.230

1.265

Upper Switch-On Resistance

RDS(ON)1

0.18

Ω

Lower Switch-On Resistance

RDS(ON)2

Ω

Upper Switch Leakage

VEN = 0V, VSW = 0V

µA

Current Limit

(4)

2.4

2.8

5.2

Current Sense Transconductance

Output Current to Comp Pin Voltage

GCS

1.95

A/V

Error Amplifier Voltage Gain

AVEA

400

V/V

Error Amplifier Transconductance

GEA

∆IC = ±10 µA

500

770

1100

µA/V

Oscillator Frequency

1.15

1.40

1.65

MHz

Short Circuit Frequency

VFB = 0V

180

KHz

Sync Frequency

Sync Drive 0V to 2.7V

1.6

2.1

MHz

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