LM2735 - 520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Application Notes Knowledge Base

Features







Input voltage range 2.7V to 5.5V
Output voltage range 3V to 24V
2.1A switch current over full temperature range
Current-Mode control
Logic high enable pin
Ultra low standby current of 80 nA in shutdown
170 mΩ NMOS switch
±2% feedback voltage accuracy
Ease-of-use, small total solution size
 Internal soft-start
 Internal compensation
 Two switching frequencies
 520 kHz (LM2735-Y)
  1.6 MHz (LM2735-X)
 Uses small surface mount inductors and chip capacitors
 Tiny SOT23-5, LLP-6, and eMSOP-8 packages
LM2735Q is AEC-Q100 Grade 1 qualified and is manufactured on an Automotive Grade Flow

General Description


The LM2735 is an easy-to-use, space-efficient 2.1A low-side switch regulator ideal for Boost and SEPIC DC-DC regulation. More...


Applications


LCD Display Backlighting For Portable Applications
OLED Panel Power Supply
USB Powered Devices
Digital Still and Video Cameras
White LED Current Source
Automotive
  Typical Application
*click for larger image


ParametersValues
Output Range Vin to 24
Switch Current 2.25 Amp
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Feedback Voltage 1.255 Volt
Frequency Max 1700, 550 kHz
Output Min 3 Volt
Output Max 24 Volt
Efficiency (peak) 90 %
Sync Pin No
Adj Switch Frequency No
Frequency Min 475, 1500 kHz
On/Off Pin Yes
Error Flag No
SoftStart Yes
Special Features 12V LLP6 EXP DAP, LLP6 EXP DAP, eMSOP8 EXP DAP, SOT23-5, 12V eMSOP8 EXP DAP, 12V SOT23-5
Topology Boost, Sepic, FlyBack
Step-Up Yes
Flyback Yes
RegType Switching Regulator
AEC Q-100 Automotive Grade 1
Automotive Yes


Typical Performance


*click for larger image


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LM2735X

 
2.70 <=
V in Lower
 V
 
<=
V in Upper
 V
 
<= 5.50
V out 3.00 <=  V <= 24.00
I out    A <= 2.10
Ambient Temperature  °C <= 100


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Additional Resources
Application Notes


Block Diagram


*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2735/LM2735Q 520kHz/1.6MHz – Space-Efficient Boost and SEPIC DC-DC Regulator 759
Kbytes
3-Feb-09 Download
LM2735/LM2735Q 520kHz/1.6MHz – Space-Efficient Boost and SEPIC DC-DC Regulator (Japanese)
1214 Kbytes   Download

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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
LM2735SD3.3EVAL520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X SEPIC 6-Pin LLP Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735XMFEVAL520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 5-Pin SOT23 Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735XMYEVAL520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 8-Pin eMSOP Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735XSDEVAL520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 6-Pin LLP Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735YMFEVAL520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 5-Pin SOT23 Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735YMYEVAL520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 8-Pin eMSOP Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735YSDEVAL520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 6-Pin LLP Demo BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM2735XMFSOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
SLEB
XTT
6 weeksN/A
LM2735XQMFSOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.55reel
of
1000
SVDB
XTT
6 weeksN/A
LM2735YMFSOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
SLFB
XTT
6 weeksN/A
LM2735YQMFSOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.55reel
of
1000
SXUB
XTT
12 weeksN/A
LM2735XMFXSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
3000
SLEB
XTT
6 weeksN/A
LM2735XQMFXSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.55reel
of
3000
SVDB
XTT
6 weeksN/A
LM2735YMFXSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
3000
SLFB
XTT
6 weeksN/A
LM2735YQMFXSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.55reel
of
3000
SXUB
XTT
6 weeksN/A
LM2735XMYMINI SOIC EXP PAD8NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
ZXTT
SRJB
6 weeksN/A
LM2735YMYMINI SOIC EXP PAD8NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
ZXTT
SRKB
6 weeksN/A
LM2735XMYXMINI SOIC EXP PAD8NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
3500
ZXTT
SRJB
6 weeksN/A
LM2735YMYXMINI SOIC EXP PAD8NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
3500
ZXTT
SRKB
6 weeksN/A
LM2735XSDLLP6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
ZXYTT
2735X
6 weeksN/A
LM2735YSDLLP6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
ZXYTT
2735Y
6 weeksN/A
LM2735XSDXLLP6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
4500
ZXYTT
2735X
6 weeksN/A
LM2735YSDXLLP6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
4500
ZXYTT
2735Y
6 weeksN/A

General Description


The LM2735 is an easy-to-use, space-efficient 2.1A low-side switch regulator ideal for Boost and SEPIC DC-DC regulation. It provides all the active functions to provide local DC/DC conversion with fast-transient response and accurate regulation in the smallest PCB area. Switching frequency is internally set to either 520kHz or 1.6MHz, allowing the use of extremely small surface mount inductor and chip capacitors while providing efficiencies up to 90%. Current-mode control and internal compensation provide ease-of-use, minimal component count, and high-performance regulation over a wide range of operating conditions. External shutdown features an ultra-low standby current of 80 nA ideal for portable applications. Tiny SOT23-5, LLP-6, and eMSOP-8 packages provide space-savings. Additional features include internal soft-start, circuitry to reduce inrush current, pulse-by-pulse current limit, and thermal shutdown.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2735XMFPVIP05009960008550005242608584
LM2735XMFXPVIP05009960008550005242608584
LM2735XMYPVIP05009960008550005242608584
LM2735XMYXPVIP05009960008550005242608584
LM2735XQMFPVIP05009960008550005242608584
LM2735XQMFXPVIP05009960008550005242608584
LM2735XSDPVIP05009960008550005242608584
LM2735XSDXPVIP05009960008550005242608584
LM2735YMFPVIP05009960008550005242608584
LM2735YMFXPVIP05009960008550005242608584
LM2735YMYPVIP05009960008550005242608584
LM2735YMYXPVIP05009960008550005242608584
LM2735YQMFPVIP05009960008550005242608584
LM2735YQMFXPVIP05009960008550005242608584
LM2735YSDPVIP05009960008550005242608584
LM2735YSDXPVIP05009960008550005242608584

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.


Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1658: Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator 408
Kbytes
26-Jun-07 Download
AN-1658 (Japanese): Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator
620 Kbytes   Download
AN-1658 (Chinese): Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator
405 Kbytes  

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AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865 1072
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AN-1408 (Chinese): Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865
697 Kbytes  
AN-1837: Application Note 1837 LM2738 Evaluation Board 799
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AN-1350: Application Note 1350 LM2734 Evaluation Board 639
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Kbytes
26-Oct-05 Download
AN-1418 (Chinese): Application Note 1418 LM2736 Evaluation Board
279 Kbytes  
AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5 691
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14-Jan-09 Download

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[Information as of 8-Nov-2009]