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 Sub 1.2V Output Synchronous Controller LM2737▲ Eliminates The Output Undervoltage Latch-off And Output Overvoltahe Latch-off LM2743▲ Flexible Vbias Operating From 3.0V To 6.0V 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

Datasheets

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-2021: Application Note 2021 LM3753/54 Evaluation Board	1109 Kbytes	15-Dec-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM2727MTC/NOPB LM2727MTC RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 186 AVNET-EM Worldwide 276 DIGIKEY Worldwide 1530 FARNELL Europe and Asia 115 FUTURE Worldwide 682 KEIKONG Asia Pacific 134 NEWARK Americas 120 RS COMPONENTS Worldwide 11	$1.15 each at 1K+ pcs	rail of 94
LM2727MTCX/NOPB LM2727MTCX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.15 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2727MTC/NOPB LM2727MTC		TSSOP	14	1 1	260 260	Detail	Download	N/A	NSZXYTT 2727 MTC
LM2727MTCX/NOPB LM2727MTCX		TSSOP	14	1 1	260 260	Detail	Download	N/A	NSZXYTT 2727 MTC

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools

Title	Size	Date
Power Reference Design Library

Reference Design

LM2727 Reference Design - Synchronous Buck Controller, High Current Output: 10-13.2V Input; 2.5V @ 5A Output

LM2727 Reference Design - Synchronous Buck Controller, High Efficiency Output: 10-13.2V Input; 2.5V @ 5A Output

CAD Symbols and Models Download LM2727 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2727MTC	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2727MTCX	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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.