sp7600 Exar Corporation, sp7600 Datasheet - Page 3

• Manufacturer Part Number: sp7600
• Description: 2amp, 29v Buck Converter For Led Driver Applications
• Manufacturer: Exar Corporation

__________________________________________________PIN DESCRIPTION
PIN #
12/17/07 rev: A
EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000
4,5
7,9
1
2
3
6
8
9
NAME
Power
PVIN
SVIN
GND
ISET
VDR
Pad
PIN
FB
LX
Regulator feedback input. A current setting resistor is connected to LED’s
cathode and FB on one side and to ground on the other side. This pin can be
also used for dimming control. By connecting a diode between this pin and a
>2V signal the LED can be pulsed at up to 1kHz
Ground pin.
Power supply for the internal driver. This voltage is internally regulated to
about 5V below VIN. Place a 0.1uF decoupling capacitor between VDR and
Vin as close as possible to the IC.
Connection to the FET Source
Input power supply for the regulator. Place input decoupling capacitor as close
as possible to this pin. This is the Vin connection for the regulator and is not
tied to the high-side FET.
Connect to the output inductor. This is the P-Channel FET Drain
This pin is used as a current limit input for the internal current limit comparator.
Connect to LX through an optional resistor. Internal threshold is pre-set to
350mV nominal and can be decreased by changing the external resistor based
on the following formula: V
Can be connected to inductor LX node for a thermal PAD – see Layout
suggestions section.
SP7600
TRSHLD
3
DESCRIPTION
= 350mV – 33uA * R
©Copyright 2007 Exar Corporation
SP7600