RoHS Compliance Information	Size in Kbytes	Date
LM20154 4A, 1MHz Synchronous Buck Regulator with SYNCOUT	730 Kbytes	16-Dec-08	Download
LM20154 4A, 1MHz Synchronous Buck Regulator with SYNCOUT (Japanese)	920 Kbytes

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

LM20154EVAL

4A, 1Mhz PowerWise® - Synchronous Buck Regulator with SYNCOUT

Full production

N/A

1+

$40.00

1

-

8 weeks

N/A

LM20154MH

TSSOP EXP PAD

16

NOPB

1

260

RoHS

Download

Full production

N/A

1K+

$2.75

rail of 92

NSUZXYTT 20154 MH

6 weeks

N/A

LM20154MHE

TSSOP EXP PAD

16

NOPB

1

260

RoHS

Download

Full production

N/A

1K+

$2.75

reel of 250

NSUZXYTT 20154 MH

8 weeks

N/A

LM20154MHX

TSSOP EXP PAD

16

NOPB

1

260

RoHS

Download

Full production

N/A

1K+

$2.75

reel of 2500

NSUZXYTT 20154 MH

6 weeks

N/A

General Description

The LM20154 is a full featured 1 MHz synchronous buck regulator capable of delivering up to 4A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

The LM20154 features an open drain SYNCOUT pin which provides an external clock that matches the switching frequency of the device but is shifted by 180 degrees.

The LM20154 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20154 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20154 is offered in an exposed pad 16-pin eTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

Reliability Metrics

Design Tools

Title	Size in Kbytes	Date
Current Mode Modeling - Reference Guide	1372 Kbytes	1-Aug-2007	View Online	Download
Understanding and Applying Current-Mode Control Theory	427 Kbytes	8-Jan-2008	View Online	Download
Download LM20154 Design Spreadsheet			View
Article - Reducing Buck Converter Input Capacitance through Multi-Phasing and Clock Synchronization			View
Article - Benefits of Multi-Phasing- Part Two			View
Article - Benefits of Multi-Phasing- Part One			View

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

Application Notes

Title	Size in Kbytes	Date
AN-1690: Application Note 1690 LM20154 Evaluation Board	431 Kbytes	30-Oct-07	Download
AN-1690 (Japanese): Application Note 1690 LM20154 Evaluation Board	606 Kbytes
AN-1745: Application Note 1745 Powering FPGAs Using LM201xx PowerWise® Synchronous Buck Regulators	117 Kbytes	29-Oct-07	Download
AN-1745 (Japanese): Application Note 1745 Powering FPGAs Using LM201xx PowerWise® Synchronous Buck Regulators	138 Kbytes
AN-1745 (Chinese): Application Note 1745 Powering FPGAs Using LM201xx PowerWise® Synchronous Buck Regulators	231 Kbytes