LM27951 Selling Leads, Price trend, LM27951 DataSheet download, circuit diagram from SeekIC.com

PinoutSpecificationsRegulated LEDs4Total LED Current120 mACurrent Matching0.2%Boost TypeSwitched Capacitor Multi-GainSwitching Frequency750 kHzEfficiency (peak)85 %Input Min Voltage3 VoltInput Max Voltage5.5 VoltBoost VoltageRegulatedLED ConfigurationParallelSupply Current1.5 mASwitching TypeFixed...

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SeekIC No. : 004395065 Detail

LM27951: PinoutSpecificationsRegulated LEDs4Total LED Current120 mACurrent Matching0.2%Boost TypeSwitched Capacitor Multi-GainSwitching Frequency750 kHzEfficiency (peak)85 %Input Min Voltage3 VoltInput Max V...

LM27951 Data Sheet

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Part Number:: LM27951
Supply Ability:: 5000

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1~5000

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Negotiable

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15 Days

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Product Details

Description

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Specifications

Regulated LEDs	4
Total LED Current	120 mA
Current Matching	0.2%
Boost Type	Switched Capacitor Multi-Gain
Switching Frequency	750 kHz
Efficiency (peak)	85 %
Input Min Voltage	3 Volt
Input Max Voltage	5.5 Volt
Boost Voltage	Regulated
LED Configuration	Parallel
Supply Current	1.5 mA
Switching Type	Fixed Freq
Special Features	Common cathode current source topology
PWM BrightCtrl	Yes
Analog-V BrightCtrl	No
Ambient Light Compensation	No
RGB-LED	No
Temperature Min	-40 deg C
Temperature Max	85 deg C
RegType	WhiteLED Driver
PowerWise	Yes
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Description

The LM27951 is a switched capacitor white-LED driver capable of driving up to 4 LEDs with 30mA through each LED. Its 4 tightly regulated current sources ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27951 operates over an input voltage range from 2.8V to 5.5V and requires only four low-cost ceramic capacitors.

The LM27951 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements.

The LM27951 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750kHz switching frequency optimized for portable applications. The LM27951 consumes less than 1µA of supply current when shut down.

The LM27951 is available in a 14-pin No-Pullback Leadless Leadframe Package: LLP-14.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM27951SD	CMOS7	0	16561	0	0	954000	4	270700104
LM27951SDX	CMOS7	0	16561	0	0	954000	4	270700104

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-1218: Application Note 1218 LM2791/2/4/5 Evaluation Board	424 Kbytes	13-May-04	Download
AN-1251: Application Note 1251 Switched Capacitor Circuits Provide Efficient and Functional White LED Drive	55 Kbytes	26-Sep-02	Download

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LM27951

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