MP1423 – 3A, 23V, 385KHz STEP-DOWN CONVERTER

MP1423 Rev. 1.1

www.MonolithicPower.com

2

1/6/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

TM

PACKAGE REFERENCE

Part Number*

Package

Temp

MP1423DN

SOIC8N

–40

°C to +85°C

MP1423DP

PDIP8

–40

°C to +85°C

* For Tape & Reel, add suffix –Z (eg. MP1423DN–Z)

For Lead Free, add suffix –LF (eg. MP1423DN–LF–Z)

ABSOLUTE MAXIMUM RATINGS

(1)

Supply Voltage VIN....................... –0.3V to +28V

Switch Voltage VSW................. –1V to VIN + 0.3V

Bootstrap Voltage VBS....VSW – 0.3V to VSW + 6V

All Other Pins................................. –0.3V to +6V

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

°C

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

°C

Storage Temperature .............–65

°C to +150°C

Recommended Operating Conditions

(2)

Input Voltage VIN................................. 6V to 23V

Ambient Operating Temp ..........–40

°C to +85°C

Thermal Resistance

(3)

θJA

θJC

SOIC8N .................................. 50 ...... 10...

°C/W

PDIP8 ..................................... 95 ...... 55...

°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.

Parameters

Symbol

Condition

Min

Typ

Max

Units

Shutdown Supply Current

VEN = 0V

20

30

µA

Supply Current

VEN = 2.8V, VFB =1.4V

1.0

1.2

mA

Feedback Voltage

VFB

6V

≤ VIN ≤ 23V

1.194

1.222

1.250

V

Error Amplifier Voltage Gain

AVEA

400

V/V

Error Amplifier Transconductance

GEA

∆ICOMP = ±10µA

500

800

1120

µA/V

High-Side Switch-On Resistance

RDS(ON)1

0.11

Ω

Low-Side Switch-On Resistance

RDS(ON)2

10

Ω

High-Side Switch Leakage Current

VEN = 0V, VSW = 0V

0

10

µA

Current Limit

3.3

4.5

A

Current Sense to COMP

Transconductance

GCS

3.8

A/V

Oscillation Frequency

fS

335

385

435

KHz

Short Circuit Oscillation Frequency

DMAX

VFB = 0V

25

40

55

KHz

Maximum Duty Cycle

VFB = 1.0V

90

%

Minimum Duty Cycle

VFB = 1.5V

0

%

EN Threshold Voltage

0.9

1.2

1.5

V

Enable Pull-Up Current

VEN = 0V

1.1

1.8

2.5

µA

Under Voltage Lockout Threshold

VIN Rising

2.37

2.54

2.71

V

Under Voltage Lockout Threshold

Hysteresis

210

mV

Soft-Start Period

CSS = 0.1µF

10

ms

Thermal Shutdown

160

°C

BS

IN

SW

GND

SS

EN

COMP

FB

1

2

3

4

8

7

6

5

TOP VIEW

MP1423_PD01

EXPOSED PAD

(SOIC8N ONLY)

CONNECT TO PIN 4