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LM2751 -
Regulated 2X, 1.5X Switched Capacitor White LED Driver
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Features
| | Regulated Output Options: 4.5V, 5.0V |
| | Output Voltage Regulated within 3% |
| | Peak Efficiency Over 90% |
| | 150mA (4.5V) or 80mA (5.0V) Output Current Capability |
| | Input Voltage Range: 2.8V to 5.5V |
| | Low Input and Output Voltage Ripple |
| | <1µA Typical Shutdown Current |
| | Small Solution Size - NO INDUCTOR |
| | Programmable 725kHz, 300kHz, 37kHz, or 9.5kHz Switching Frequencies |
| | 10-pin LLP No-Pullback Package: 3mm × 3mm × 0.8mm |
General Description
The LM2751 is a constant frequency switched capacitor charge pump with regulated output voltage options of 4.5V, and 5.0V. More...
Applications
| | White LED Display Backlights |
| | White LED Keypad Backlights |
| | General Purpose 2×, 1.5× Regulated Charge Pump |
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Typical Application
click for larger image
| Parameters | Values |
| Switch Current |
0.08, 0.15 Amp |
| Output Min |
4.5, 5 Volt |
| Output Max |
4.5, 5 Volt |
| Input Min Voltage |
2.8 Volt |
| Input Max Voltage |
5.5 Volt |
| Efficiency (peak) |
92 % |
| Frequency Min |
9.5 kHz |
| Frequency Max |
725 kHz |
| Special Features |
LED Driver, Inductorless regulated boost converter, 1.5x and 2x gains |
| Adj Switch Frequency |
Yes |
| Adjustable Output |
No |
| On/Off Pin |
Yes |
| PWM Mode |
Multi-gain Switched Capacitor Doubler |
| Topology |
Boost |
| Step-Up |
Yes |
| Inverting |
No |
| RegType |
Switched Cap Regulator |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| PowerWise |
No |
Typical Performance
click for larger image
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WEBENCH Live Simulation!
Additional Resources
Application Notes

Block Diagram
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Datasheet
Package Availability, Models, Samples & Pricing
General Description
The LM2751 is a constant frequency switched capacitor charge pump with regulated output voltage options of 4.5V, and 5.0V. Over the input voltage range of 2.8V to 5.5V the LM2751 provides up to 150mA of output current and requires only four low-cost ceramic capacitors.
The LM2751 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or 2. The proper gain for maintaining regulation is chosen so that efficiency is maximized over the input voltage range.
LM2751 uses constant frequency pre-regulation to minimize conducted noise on the input and provide a predictable switching frequency. The switching frequency is programmable to 725kHz, 300kHz, 37kHz, or 9.5kHz.
LM2751 is available in a 10-pin Leadless Leadframe No-Pullback Package: LLP-10.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM2751SD-A | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM2751SD-B | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM2751SDX-A | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM2751SDX-B | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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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.
More Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1269: Application Note 1269 LM2750-5.0 Evaluation Board |
233 Kbytes |
2-Oct-03 |
Download |
| AN-1302: Application Note 1302 LM2750-ADJ Evaluation Board |
194 Kbytes |
26-Mar-04 |
Download |
| AN-1777: Application Note 1777 Designing Energy-Efficient Handheld Illumination Solutions |
156 Kbytes |
27-Feb-08 |
Download |
AN-1777 (Chinese): Application Note 1777 Designing Energy-Efficient Handheld Illumination Solutions
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306 Kbytes |
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| AN-1998: Application Note 1998 How to Meet the HDMI 5V Source Requirement |
117 Kbytes |
28-Aug-09 |
Download |
| AN-1546: Application Note 1546 LM2754 Evaluation Board |
927 Kbytes |
3-Nov-06 |
Download |
AN-1546 (Chinese): Application Note 1546 LM2754 Evaluation Board
|
393 Kbytes |
|
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| AN-1778: Application Note 1778 LM2755 Charge Pump LED Controller with I2C Compatible Interface in µSMD |
4110 Kbytes |
30-Apr-08 |
Download |
| AN-1779: Application Note 1779 LM2756 Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in µSMD |
2288 Kbytes |
31-Mar-08 |
Download |
| AN-1695: Application Note 1695 LM2758 Flash LED Driver Evaluation Board |
347 Kbytes |
9-Apr-08 |
Download |
| AN-1731: Application Note 1731 LM2757 Evaluation Board |
573 Kbytes |
19-Feb-08 |
Download |
[Information as of 4-Nov-2009]
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