MP4459 – 1.5A, 4MHz, 36V STEP-DOWN CONVERTER

MP4459 Rev. 1.03

www.MonolithicPower.com

2

4/9/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number*

Package

Top Marking

MP4459DQT

3x3mm TQFN10

N4

* For Tape & Reel, add suffix –Z (e.g. MP4459DQT–Z);

For RoHS, compliant packaging, add suffix –LF (e.g. MP4459DQT–LF–Z).

PACKAGE REFERENCE

ABSOLUTE MAXIMUM RATINGS (1)

Supply Voltage (VIN).....................–0.3V to +40V

Switch Voltage (VSW)............ –0.3V to VIN + 0.3V

BST to SW .....................................–0.3V to +6V

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

Continuous Power Dissipation (TA = +25°C)

(2)

3x3mm TQFN10 ........................................ 2.5W

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

°C

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

°C

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

°C

Recommended Operating Conditions

(3)

Supply Voltage VIN ...........................3.8V to 36V

Output Voltage VOUT.........................0.8V to 30V

Operating Junct. Temp. .......... –40

°C to +125°C

Thermal Resistance

(4)

θJA

θJC

3x3mm TQFN10 ..................... 50 ...... 12...

°C/W

Notes:

1) Exceeding these ratings may damage the device.

2) The maximum allowable power dissipation is a function of the

maximum junction temperature TJ (MAX), the junction-to-

ambient thermal resistance θJA, and the ambient temperature

TA. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by PD (MAX) = (TJ

(MAX)-TA)/θJA. Exceeding the maximum allowable power

dissipation will cause excessive die temperature, and the

regulator will go into thermal shutdown. Internal thermal

shutdown circuitry protects the device from permanent

damage.

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

operating conditions.

4) Measured on JESD51-7, 4-layer PCB.

TOP VIEW

SW

SW

EN

COMP

FB

1

2

3

4

5

BST

VIN

VIN

FREQ

GND

10

9

8

7

6

EXPOSED PAD

ON BACKSIDE