LM27951SD

NRND

Texas Instruments

IC LED DRV RGLTR PWM 30MA 14WSON

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LM27951SD

NRND

Texas Instruments

IC LED DRV RGLTR PWM 30MA 14WSON

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Description Specifications Series Pricing CAD Documents

Description

General part information

LM27951 Series

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.

Technical Specifications

Parameters and characteristics for this part

Specification	LM27951SD

Applications	Backlight
Current - Output / Channel	30 mA
Dimming	PWM
Frequency	750 kHz
Internal Switch(s)	Yes
Mounting Type	Surface Mount
Number of Outputs	4
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Package / Case	14-WFDFN Exposed Pad
Package Length	4 mm
Package Name	14-WSON
Package Width	3 mm
Topology	Switched Capacitor (Charge Pump)
Type	DC DC Regulator
Voltage - Output (Max)	3.9 V
Voltage - Output (Min)	2.5 V
Voltage - Supply (Max)	5.5 V
Voltage - Supply (Min)	2.8 V

LM27951 Series

White LED adaptive 1.5X/1X switched capacitor current driver with 2.8V-5.5V input voltage range

Part	Voltage - Output (Min)	Voltage - Output (Max)	Applications	Voltage - Supply (Min)	Frequency	Current - Output / Channel	Topology	Type	Voltage - Supply (Max)	Number of Outputs	Package Name	Package Width	Package Length	Mounting Type	Internal Switch(s)	Operating Temperature (Max)	Operating Temperature (Min)	Package / Case	Dimming
Texas Instruments LM27951SDX/NOPB	2.5 V	3.9 V	Backlight	2.8 V	750 kHz	30 mA	Switched Capacitor (Charge Pump)	DC DC Regulator	5.5 V	4	14-WSON	3 mm	4 mm	Surface Mount	Yes	85 °C	-40 °C	14-WFDFN Exposed Pad	PWM
Texas Instruments LM27951SD	2.5 V	3.9 V	Backlight	2.8 V	750 kHz	30 mA	Switched Capacitor (Charge Pump)	DC DC Regulator	5.5 V	4	14-WSON	3 mm	4 mm	Surface Mount	Yes	85 °C	-40 °C	14-WFDFN Exposed Pad	PWM
Texas Instruments LM27951SDX	2.5 V	3.9 V	Backlight	2.8 V	750 kHz	30 mA	Switched Capacitor (Charge Pump)	DC DC Regulator	5.5 V	4	14-WSON	3 mm	4 mm	Surface Mount	Yes	85 °C	-40 °C	14-WFDFN Exposed Pad	PWM
Texas Instruments LM27951SD/NOPB	2.5 V	3.9 V	Backlight	2.8 V	750 kHz	30 mA	Switched Capacitor (Charge Pump)	DC DC Regulator	5.5 V	4	14-WSON	3 mm	4 mm	Surface Mount	Yes	85 °C	-40 °C	14-WFDFN Exposed Pad	PWM

Pricing

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