RoHS Compliance Information	Size in Kbytes	Date
LM3151/LM3152/LM3153 SIMPLE SWITCHER ® CONTROLLER, High Input Voltage Synchronous Step-Down	479 Kbytes	26-Aug-09	Download

Part Number

Package

Factory Lead Time

Models

Samples & Electronic Orders

Budgetary Pricing

Std Pack Size

Package Marking Format

Type

Pins

Spec.

MSL Rating

Peak Reflow

RoHS Report

CAD Symbols

Weeks

Qty

Qty

$US each

LM3152-3.3DEMO

LM3152 - RD-164 - Demonstration Board

Full production

N/A

1+

$19.00

1

-

N/A

N/A

LM3151MH-3.3

TSSOP EXP PAD

14

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$2.30

rail of 94

NSUZXYTT LM3151 -3.3

8 weeks

N/A

LM3151MHE-3.3

TSSOP EXP PAD

14

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$2.30

reel of 250

NSUZXYTT LM3151 -3.3

6 weeks

N/A

LM3151MHX-3.3

TSSOP EXP PAD

14

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$2.30

reel of 2500

NSUZXYTT LM3151 -3.3

12 weeks

N/A

General Description

The LM3151/2/3 SIMPLE SWITCHER ® Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current in a typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 features a fixed output voltage of 3.3V, and features switching frequencies of 250 kHz, 500 kHz, and 750 kHz. The synchronous architecture provides for highly efficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated Ripple Mode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltage ripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop compensation, which reduces external component count and reduces design complexity.

Fault protection features such as thermal shutdown, under-voltage lockout, over-voltage protection, short-circuit protection, current limit, and output voltage pre-bias startup allow for a reliable and robust solution.

The LM3151/2/3 SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH ® online design tool. WEBENCH ® provides design support for every step of the design process and includes features such as external component calculation with a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping.

Reliability Metrics

Design Tools

Title	Size in Kbytes	Date
Downloadable LM315x Quick Start Simple Switcher Controller Component Calculator	1861 Kbytes	20-Oct-2008	View
Article - Emulated Ripple Technique Advances Hysteretic Switchmode Supplies			View

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Application Notes

Title	Size in Kbytes	Date
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-May-04	Download
AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	304 Kbytes
AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	668 Kbytes
AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	574 Kbytes	27-Sep-06	Download
AN-1481 (Japanese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	220 Kbytes
AN-1481 (Chinese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	421 Kbytes

More Application Notes

Title	Size in Kbytes	Date
AN-1900: Application Note 1900 LM3150 Evaluation Boards	626 Kbytes	14-Oct-08	Download