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LM27951

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

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Pinout




Specifications

Regulated LEDs4
Total LED Current120 mA
Current Matching0.2%
Boost TypeSwitched Capacitor Multi-Gain
Switching Frequency750 kHz
Efficiency (peak)85 %
Input Min Voltage3 Volt
Input Max Voltage5.5 Volt
Boost VoltageRegulated
LED ConfigurationParallel
Supply Current1.5 mA
Switching TypeFixed Freq
Special FeaturesCommon cathode current source topology
PWM BrightCtrlYes
Analog-V BrightCtrlNo
Ambient Light CompensationNo
RGB-LEDNo
Temperature Min-40 deg C
Temperature Max85 deg C
RegTypeWhiteLED Driver
PowerWiseYes
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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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