Features • PowerWise ® step-down controller • 6V to 42V Wide input voltage range • Fixed output voltage of 3.3V • Fixed switching frequencies of 250 kHz/500 kHz/750 kHz • No loop compensation required • Fully WEBENCH ® enabled • Low external component count • Constant On-Time control • Ultra-Fast transient response • Stable with low ESR capacitors • Output voltage pre-bias startup • Valley current limit • Programmable soft-start 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.

LM3153   8.00 <= V in Lower  V   <= V in Upper  V   <= 18.00 V out 3.30 <=  V <= 3.30 I out    A <= 12.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM3150▲ 12A SIMPLE SWITCHER Controller With Adjustable Output And Frequency LM3151▲ 12A SIMPLE SWITCHER Controller With Fixed 3.3V, 250kHz Output LM3152▲ 12A SIMPLE SWITCHER Controller With Fixed 3.3V, 500kHz Output MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM3151/LM3152/LM3153 SIMPLE SWITCHER ® CONTROLLER, High Input Voltage Synchronous Step-Down	479 Kbytes	26-Aug-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-May-04	日本語 中文
	AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	574 Kbytes	27-Sep-06	日本語 中文

More Application Notes

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

Design Tools

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

Reference Design

RD-164 - LM3152-3.3 Design with 3.3V @ 10A, Low Output Ripple, Fast Transient Response Over a 6V to 24V Input

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3153MH-3.3	ABCD5	0	5364	0	0	1626984	3	461661152
LM3153MHE-3.3	ABCD5	0	5364	0	0	1626984	3	461661152
LM3153MHX-3.3	ABCD5	0	5364	0	0	1626984	3	461661152

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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