LM27951SD

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Series Information for LM27951SD - Texas Instruments

Features

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

Description

LED DRIVER SW CAP POWERWISE LLP-14
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.

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