MP1423 データシートの表示（PDF） - Monolithic Power Systems

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MP1423

3A, 23V, 385KHz Step-Down Converter

Monolithic Power Systems 

TM

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

PACKAGE REFERENCE

TOP VIEW

BS 1

IN 2

SW 3

GND 4

8 SS

7 EN

6 COMP

5 FB

EXPOSED PAD

(SOIC8N ONLY)

CONNECT TO PIN 4

MP1423_PD01

Part Number*

Package

Temp

MP1423DN

MP1423DP

SOIC8N

PDIP8

–40°C to +85°C

–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

Shutdown Supply Current

Supply Current

Feedback Voltage

Error Amplifier Voltage Gain

Error Amplifier Transconductance

High-Side Switch-On Resistance

Low-Side Switch-On Resistance

High-Side Switch Leakage Current

Current Limit

VFB

AVEA

GEA

RDS(ON)1

RDS(ON)2

VEN = 0V

VEN = 2.8V, VFB =1.4V

6V ≤ VIN ≤ 23V

∆ICOMP = ±10µA

VEN = 0V, VSW = 0V

Current Sense to COMP

Transconductance

GCS

Oscillation Frequency

Short Circuit Oscillation Frequency

Maximum Duty Cycle

Minimum Duty Cycle

EN Threshold Voltage

fS

DMAX

VFB = 0V

VFB = 1.0V

VFB = 1.5V

Enable Pull-Up Current

Under Voltage Lockout Threshold

Under Voltage Lockout Threshold

Hysteresis

VEN = 0V

VIN Rising

Soft-Start Period

Thermal Shutdown

CSS = 0.1µF

Min

1.194

500

3.3

335

25

0.9

1.1

2.37

Typ

20

1.0

1.222

400

800

0.11

10

0

4.5

3.8

385

40

90

1.2

1.8

2.54

210

10

160

Max

30

1.2

1.250

1120

10

435

55

0

1.5

2.5

2.71

Units

µA

mA

V

V/V

µA/V

Ω

Ω

µA

A

A/V

KHz

KHz

%

%

V

µA

V

mV

ms

°C

MP1423 Rev. 1.1

www.MonolithicPower.com

2

1/6/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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