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MP1593

3A, 28V, 385KHz Step-Down Converter

Monolithic Power Systems 

MP1593 – 3A, 28V, 385KHz STEP-DOWN CONVERTER

PACKAGE REFERENCE

TOP VIEW

BS 1

IN 2

SW 3

GND 4

EXPOSED PAD

ON BACKSIDE

CONNECT TO PIN 4

8 SS

7 EN

6 COMP

5 FB

Part Number* Package

Temperature

MP1593DN

SOIC8E

(Exposed Pad)

–40°C to +85°C

* For Tape & Reel, add suffix –Z (eg. MP1593DN–Z)

For RoHS Compliant Packaging, add suffix –LF

(eg. MP1593DN–LF–Z)

ABSOLUTE MAXIMUM RATINGS (1)

Supply Voltage VIN....................... –0.3V to +30V

Switch Voltage VSW.............. –0.5V 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 28V

Ambient Operating Temp............. –40°C to +85°C

Thermal Resistance (3) θJA θJC

SOIC8E (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

VEN = 0V

VEN = 2.6V, VFB = 1.4V

Feedback Voltage

VFB

4.75V ≤ VIN ≤ 28V

VCOMP < 2V

Error Amplifier Voltage Gain AEA

Error Amplifier

Transconductance

GEA ∆ICOMP = ±10µA

High-Side Switch

On-Resistance

RDS(ON)1

Low-Side Switch

On-Resistance

RDS(ON)2

High-Side Switch Leakage

Current

VEN = 0V, VSW = 0V

Current Limit

Current Sense to COMP

Transconductance

GCS

Oscillation Frequency

Short Circuit Oscillation

Frequency

fOSC1

fOSC2

VFB = 0V

Maximum Duty Cycle

DMAX VFB = 1.0V

Minimum Duty Cycle

DMIN VFB = 1.5V

Min

1.194

500

Typ

20

1.0

1.222

400

800

Max

30

1.2

1.250

1120

Units

µA

mA

V

V/V

µA/V

100

140

mΩ

10

Ω

0

10

µA

4.8

6.2

7.6

A

5.4

A/V

335

385

435 KHz

25

45

60

KHz

90

%

0

%

MP1593 Rev. 1.9

www.MonolithicPower.com

2

9/14/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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