Features • Input power from 2.2V to 16V • Output voltage adjustable down to 0.6V • Power Good flag, adjustable soft-start and output enable for easy power sequencing • Output over-voltage and under-voltage latch-off (LM2727) • Output over-voltage and under-voltage flag (LM2737) • Reference Accuracy: 1.5% (0°C - 125°C) • Current limit without sense resistor • Soft start • Switching frequency from 50 kHz to 2 MHz • TSSOP-14 package Description The LM2727 and LM2737 are high-speed, synchronous, switching regulator controllers. They are intended to control currents of 0.7A to 20A with up to 95% conversion efficiencies. The LM2727 employs output over-voltage and under-voltage latch-off. For applications where latch-off is not desired, the LM2737 can be used. Power up and down sequencing is achieved with the power-good flag, adjustable soft-start and output enable features. The LM2737 and LM2737 operate from a low-current 5V bias and can convert from a 2.2V to 16V power rail. Both parts utilize a fixed-frequency, voltage-mode, PWM control architecture and the switching frequency is adjustable from 50kHz to 2MHz by adjusting the value of an external resistor. Current limit is achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which enhances low duty-cycle operation. The wide range of operating frequencies gives the power supply designer the flexibility to fine-tune component size, cost, noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap structure helps to further maximize efficiency. The high-side power FET drain voltage can be from 2.2V to 16V and the output voltage is adjustable down to 0.6V. Applications • Cable Modems • Set-Top Boxes/ Home Gateways • DDR Core Power • High-Efficiency Distributed Power • Local Regulation of Core Power

Also Recommended LM2647 Dual Channels, 28V Vin Max LM2727▲ Has Output Undervoltage And Output Overvoltage Latch-off LM2743▲ 3.0 To 6.0 Vcc LM2745▲ Has Clock Syncronization (Sync Pin) LM5115 75V Vin Sync 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
	LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages	602 Kbytes	16-Jun-03	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1247: Application Note 1247 LM2727 Evaluation Board	689 Kbytes	31-Oct-02
	AN-1325: Application Note 1325 LM2742 Evaluation Board	607 Kbytes	1-Apr-04

More Application Notes

Title		Size	Date	Other Language
	AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators	348 Kbytes	25-Jun-09
	AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865	1072 Kbytes	10-Jan-06	中文
	AN-1837: Application Note 1837 LM2738 Evaluation Board	799 Kbytes	10-Apr-08
	AN-1418: Application Note 1418 LM2736 Evaluation Board	858 Kbytes	26-Oct-05	中文
	AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5	691 Kbytes	14-Jan-09

Design Tools

Reference Design

LM2737 Reference Design - 1 High Brightness LED, 2000 mA (Solar Cell)

LM2737 Reference Design - Synchronous Buck Controller, High Current Output: 5V Input; 3.3V @ 30A Output

LM2737 Reference Design - Synchronous Buck Controller, High Current Output: 10-13.2V Input; 2.5V @ 5A Output

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2737MTC	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2737MTCX	ABCD150	0	34175	0	0	4234000	1	1201409060

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.

For more information on Reliability Metrics, please click here.