LM2727 - N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages

Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Reference Designs Knowledge Base

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

General Description

The LM2727 and LM2737 are high-speed, synchronous, switching regulator controllers. More...


Applications

•Cable Modems
•Set-Top Boxes/ Home Gateways
•DDR Core Power
•High-Efficiency Distributed Power
•Local Regulation of Core Power
  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Output Current 20000 mA
Input Min Voltage 2.2 Volt
Input Max Voltage 16 Volt
Feedback Voltage 0.6 Volt
Feedback Tolerance 1.5 %
Frequency Min 50 kHz
Frequency Max 2000 kHz
Output Current 20000 mA
Input Min Voltage 2.2 Volt
Input Max Voltage 16 Volt
Feedback Voltage 0.6 Volt
Feedback Tolerance 1.5 %
Frequency Min 50 kHz
Frequency Max 2000 kHz
Output Range 0.6V to 5V
Adj Switch Frequency Yes
Adjustable Output Yes
On/Off Pin Yes
Error Flag Yes
SoftStart Yes
Sync Pin No
Inverting No
Flyback No
Lossless Current Sense Yes
RegType Switching Controller
Temperature Min 0 deg C
Temperature Max 125 deg C
Channels 1 Channels
Special Features UVLO; UVP; Suspend to disk shutdown
Topology Synchronous Buck
PWM Mode Voltage
Step-Down Yes
Step-Up No
Output Max 5 Volt
Output Min 0.6 Volt
View Using Catalog


Typical Performance

click for larger image


  Also Recommended
LM2647Dual Sub 1.2V Output Synchronous Controller
LM2737Eliminates The Output Undervoltage Latch-off And Output Overvoltahe Latch-off
LM2743Flexible Vbias Operating From 3.0V To 6.0V
LM2745Has Clock Syncronization (Sync Pin)
LM511575V Vin Sync Buck Controller

Additional Resources

Online Seminars Design Tools (see below)


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages 602 Kbytes 16-Jun-03 View Online
Download
LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages (Japanese)
 331 Kbytes   Download

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


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM2727EVALN-Channel FET Synchronous Buck Regulator Controller for Low Output VoltagesFull productionN/A
 
Buy Now 		1+$105.001-
8 weeksN/A
LM2727MTCTSSOP14NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.25rail
of
94		NSZXYTT
2727
MTC
6 weeks1000
LM2727MTCXTSSOP14STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.25reel
of
2500		NSZXYTT
2727
MTC
6 weeks3000

General 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.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM * LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2727MTCABCD1500282800029740002843880620
LM2727MTCXABCD1500282800029740002843880620

Note: The Early Failure Rates were calculated as point estimates. 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.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
Power Reference Design Library 0 Kbytes 28-Mar-2006 View    

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


Reference Designs
•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

Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1247: Application Note 1247 LM2727 Evaluation Board 689 Kbytes 31-Oct-02 Download
AN-1325: Application Note 1325 LM2742 Evaluation Board 607 Kbytes 1-Apr-04 Download

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

[Information as of 21-Nov-2008]