LM2751 - Regulated 2X, 1.5X Switched Capacitor White LED Driver
Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

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
  Typical Application
click for larger image


ParametersValues
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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LM2751
 
2.80 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 5.50
V out 4.50 <=  V <= 5.00
I out    A <= 0.15
Ambient Temperature  °C <= 100


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Additional Resources
Application Notes


Block Diagram

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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2751 Regulated 2X, 1.5X Switched Capacitor White LED Driver 953
Kbytes		 25-Apr-05 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
LM2751SD-ALLP10NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		ZXYTT
L145B
8 weeks10000
LM2751SD-BLLP10NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		ZXYTT
L146B
6 weeksN/A
LM2751SDX-ALLP10NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
4500		ZXYTT
L145B
8 weeks40000
LM2751SDX-BLLP10NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
4500		ZXYTT
L146B
6 weeksN/A

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)
LM2751SD-ACMOS70184060010890004309006723
LM2751SD-BCMOS70184060010890004309006723
LM2751SDX-ACMOS70184060010890004309006723
LM2751SDX-BCMOS70184060010890004309006723

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

TitleSize in Kbytes Date Click link below to Download
AN-1269: Application Note 1269 LM2750-5.0 Evaluation Board 233
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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
 306 Kbytes  
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  
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

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

[Information as of 4-Nov-2009]