Features • Emulated current mode control • Drives external high-side N-channel MOSFET • Ultra-wide input voltage range from 4.5V to 42V • Low IQ Shutdown and Standby modes • High duty cycle ratio feature for reduced dropout voltage • Spread spectrum EMI reduction (LM25088-1) • Hiccup timer for overload protection (LM25088-2) • Adjustable output voltage from 1.205V with 1.5% feedback reference accuracy • Wide bandwidth error amplifier • Single resistor oscillator frequency setting • Oscillator synchronization capability • Programmable soft-start • High voltage, low dropout bias regulator • Thermal shutdown protection Description The LM25088 high voltage non-synchronous buck controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. The LM25088 can be configured to operate over an ultra-wide input voltage range of 4.5V to 42V. This easy to use controller includes a level shifted gate driver capable of controlling an external N-channel buck switch. The control method is based upon peak current mode control utilizing an emulated current ramp. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage/low output voltage applications. The LM25088 switching frequency is programmable from 50 kHz to 1 MHz. The LM25088 is available in two versions: The LM25088-1 provides a +/-5% frequency dithering function to reduce the conducted and radiated EMI, while the LM25088-2 provides a versatile restart timer for overload protection. Additional features include a low dropout bias regulator, tri-level enable input to control shutdown and standby modes, soft-start and oscillator synchronization capability. The device is available in a thermally enhanced TSSOP-16EP pin package.

LM25088   4.50 <= V in Lower  V   <= V in Upper  V   <= 42.00 V out 1.23 <=  V <= 42.00 I out    A <= 10.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM5088▲ Higher Voltage Version Of LM25088 LM5116▲ Wide Range Synchronous Buck Controller 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
	LM25088 Wide Input Range Non-Synchronous Buck Controller	528 Kbytes	7-Jun-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1931: Application Note 1931 LM25088 Evaluation Board	242 Kbytes	8-Dec-08

More Application Notes

Title		Size	Date	Other Language
	AN-1931: Application Note 1931 LM25088 Evaluation Board	242 Kbytes	8-Dec-08

Design Tools

Title	Size	Date
LM(2)5088 Quick Start Calculator	268 Kbytes	5-Dec-2008

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25088MH-1	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25088MH-2	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25088MHX-1	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25088MHX-2	ABCD150XV1	0	3868	0	0	2595000	2	736338335

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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