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LM2735 -
520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator
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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 |
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Typical Application
*click for larger image
| Parameters | Values |
|---|
| 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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WEBENCH Live Simulation!
Additional Resources
Application Notes
Block Diagram
*click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| 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 |
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Package Availability, Models, Samples & Pricing
| Part Number | Package | Factory Lead Time | Models | Samples &
Electronic
Orders | Budgetary Pricing | Std
Pack
Size | Package
Marking
Format |
| Type | Pins | Spec. | MSL
Rating | Peak
Reflow | RoHS
Report | CAD
Symbols | Weeks | Qty | Qty | $US each |
| LM2735SD3.3EVAL | 520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X SEPIC 6-Pin LLP Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735XMFEVAL | 520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 5-Pin SOT23 Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735XMYEVAL | 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 8-Pin eMSOP Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735XSDEVAL | 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 6-Pin LLP Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735YMFEVAL | 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 5-Pin SOT23 Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735YMYEVAL | 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735X Boost 8-Pin eMSOP Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735YSDEVAL | 520kHz/1.6MHz Space-Efficient Boost and SEPIC DC-DC Regulator LM2735Y Boost 6-Pin LLP Demo Board | Full production | N/A
|
| 1+ | $37.50 | 1 | - |
| 8 weeks | N/A |
| LM2735XMF | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
| 
| 1K+ | $1.25 | reel
of
1000 | SLEB
XTT |
| 6 weeks | N/A |
| LM2735XQMF | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.55 | reel
of
1000 | SVDB
XTT |
| 6 weeks | N/A |
| LM2735YMF | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
1000 | SLFB
XTT |
| 6 weeks | N/A |
| LM2735YQMF | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.55 | reel
of
1000 | SXUB
XTT |
| 12 weeks | N/A |
| LM2735XMFX | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
3000 | SLEB
XTT |
| 6 weeks | N/A |
| LM2735XQMFX | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.55 | reel
of
3000 | SVDB
XTT |
| 6 weeks | N/A |
| LM2735YMFX | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
3000 | SLFB
XTT |
| 6 weeks | N/A |
| LM2735YQMFX | SOT-23 | 5 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.55 | reel
of
3000 | SXUB
XTT |
| 6 weeks | N/A |
| LM2735XMY | MINI SOIC EXP PAD | 8 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
1000 | ZXTT
SRJB |
| 6 weeks | N/A |
| LM2735YMY | MINI SOIC EXP PAD | 8 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
1000 | ZXTT
SRKB |
| 6 weeks | N/A |
| LM2735XMYX | MINI SOIC EXP PAD | 8 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
3500 | ZXTT
SRJB |
| 6 weeks | N/A |
| LM2735YMYX | MINI SOIC EXP PAD | 8 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
3500 | ZXTT
SRKB |
| 6 weeks | N/A |
| LM2735XSD | LLP | 6 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
1000 | ZXYTT
2735X |
| 6 weeks | N/A |
| LM2735YSD | LLP | 6 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
1000 | ZXYTT
2735Y |
| 6 weeks | N/A |
| LM2735XSDX | LLP | 6 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
4500 | ZXYTT
2735X |
| 6 weeks | N/A |
| LM2735YSDX | LLP | 6 | NOPB | 1 | 260 | RoHS |
Download |
Full production | N/A
|
| 1K+ | $1.25 | reel
of
4500 | ZXYTT
2735Y |
| 6 weeks | N/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) |
|
LM2735XMF | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735XMFX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
|
LM2735XMY | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735XMYX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735XQMF | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735XQMFX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735XSD | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735XSDX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2735YMF | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735YMFX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735YMY | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2735YMYX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2735YQMF | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2735YQMFX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2735YSD | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2735YSDX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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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
| Title | Size in Kbytes |
Date |
|
| 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 |
|
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AN-1658 (Chinese): Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator
|
405 Kbytes |
|
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More Application Notes
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Date |
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| AN-1280: Application Note 1280 LM2731/LM2733 Evaluation Board |
55
Kbytes |
18-Apr-03 |
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348
Kbytes |
25-Jun-09 |
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| AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865 |
1072
Kbytes |
10-Jan-06 |
Download |
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
Kbytes |
10-Apr-08 |
Download |
| AN-1350: Application Note 1350 LM2734 Evaluation Board |
639
Kbytes |
4-Feb-05 |
Download |
| AN-1418: Application Note 1418 LM2736 Evaluation Board |
858
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
Kbytes |
14-Jan-09 |
Download |
[Information as of 8-Nov-2009]
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