LM27951SD Part Information

Details for LM27951SD by Texas Instruments

Electronic & Electrical Components > Semiconductors - ICs > Driver & Interface ICs

Part Description

The LM27951 is a switched capacitor white-LED driver capable of driving up to four LEDs with 30 mA through each LED. Its four 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 2.8 V to 5.5 V 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 750-kHz switching frequency optimized for portable applications. The LM27951 consumes less than 1 µA of supply current when shut down. The LM27951 is available in a 14-pin no-pullback WSON package.

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Part Features

  • 3/2u00d7, 1u00d7 Gain Transition Based on LED Vu0192
  • < 1-u00b5A Shutdown Current
  • Drives up to Four LEDs With up to 30 mA each
  • Fixed 750-kHz Switching Frequency
  • Input Voltage Range: 2.8 V to 5.5 V
  • PWM Brightness Control
  • Peak Efficiency Over 85%
  • Regulated Current Sources with 0.2% (Typical) Matching
  • Very Small Solution Size - No Inductor

Part Specifications

Device Topology Charge Pump
No. of Outputs 4Outputs
Output Current 30mA
Output Voltage 3.9V
Driver Case Style LLP
No. of Pins 14Pins
Input Voltage Min 2.8V
Input Voltage Max 5.5V
Switching Frequency 750kHz
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 1 - Unlimited
SVHC No SVHC (27-Jun-2018)
Base Number 27951
Device Type LED
Dimming Control Type PWM
Efficiency 85%
Input Voltage 2.8V to 5.5V
LED Driver Application Display Backlighting Lighting
Operating Temperature Range -40°C to +85°C
Termination Type Surface Mount Device
RoHS Compliant

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