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MP1484

3A, 18V, 340KHz Synchronous Rectified Step-Down Converter

Monolithic Power Systems 

MP1484 – 3A, 18V, 340KHz SYNCHRONOUS RECTIFIED 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

ON BACKSIDE

CONNECT

TO GND PIN

Part Number* Package

Temperature

MP1484EN

SOIC8N

(Exposed Pad)

–20°C to +85°C

* For Tape & Reel, add suffix –Z (e.g. MP1484EN -Z)

For Lead Free, add suffix –LF (e.g. MP1484EN - LF-Z)

ABSOLUTE MAXIMUM RATINGS (1)

Supply Voltage VIN....................... –0.3V to +24V

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

Boost 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............................ 4.75V to 18V

Output Voltage VOUT .................... 0.925V to 20V

Ambient Operating Temp .............. –20°C to +85°C

Thermal Resistance (3) θJA θJC

SOIC8N(Exposed Pad) .......... 50 ...... 10... °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

Shutdown Supply Current

Supply Current

Feedback Voltage

Feedback Overvoltage Threshold

Error Amplifier Voltage Gain (4)

Error Amplifier Transconductance

High-Side/Low-Side Switch On-

Resistance (4)

VEN = 0V

VEN = 2.0V, VFB = 1.0V

VFB 4.75V ≤ VIN ≤ 18V

AEA

GEA ΔIC = ±10μA

High-Side Switch Leakage Current

Upper Switch Current Limit

VEN = 0V, VSW = 0V

Minimum Duty Cycle

Lower Switch Current Limit

From Drain to Source

COMP to Current Sense

Transconductance

GCS

Oscillation Frequency

Short Circuit Oscillation Frequency

Maximum Duty Cycle

Minimum On Time (4)

EN Shutdown Threshold Voltage

EN Shutdown Threshold Voltage

Hysterisis

Fosc1

Fosc2

DMAX

TON

VFB = 0V

VFB = 1.0V

VEN Rising

Min

0.900

3.8

300

1.1

Typ

0.3

1.3

0.925

1.1

400

820

85

0

5.3

0.9

5.2

340

110

90

220

1.5

220

Max

3.0

1.5

0.950

10

380

2.0

Units

μA

mA

V

V

V/V

μA/V

mΩ

μA

A

A

A/V

KHz

KHz

%

ns

V

mV

MP1484 Rev. 0.9

www.MonolithicPower.com

2

10/23/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2008 MPS. All Rights Reserved.

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