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IS31LT3948

Part Number	IS31LT3948
Manufacturer	ISSI
Description	PFM MODE BOOST LED DRIVER
Published	Feb 23, 2013
Detailed Description	IS31LT3948 PFM MODE BOOST LED DRIVER WITH THE EXTERNAL NMOS OCTOBER 2011 GENERAL DESCRIPTION The IS31LT3948 is a PFM ste...
Datasheet	IS31LT3948 PDF File

Overview

IS31LT3948 PFM MODE BOOST LED DRIVER WITH THE EXTERNAL NMOS OCTOBER 2011 GENERAL DESCRIPTION The IS31LT3948 is a PFM step-up DC-DC converter designed for driving the white LED arrays for large size LCD panel backlighting applications.
It can deliver stable constant output current from a few milliamps up to 2A, programmed via an external resistor.
The IS31LT3948 utilizes a control scheme in which the output is automatically adjusted to the optimum output voltage for the system, maximizing the efficiency.
Furthermore, the control scheme is inherently stable removing the need to provide additional loop compensation.
The device features external PWM dimming, which allows the flexible control of the back-lighting luminance.
The IS31LT3948 has a wide input voltage range from 5V to 100V (Note).
An integrated OVP circuit protects the chip and the system even under no-load conditions.
Note: The IS31LT3948 has an internal 5V shunt regulator connected to the VCC pin.
A dropping resistor must be c...

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