IS32LT3117 CURRENT REGULATOR Datasheet

IS32LT3117 Datasheet, PDF, Equivalent


Part Number

IS32LT3117

Description

4-CHANNEL CONSTANT CURRENT REGULATOR

Manufacture

ISSI

Total Page 15 Pages
Datasheet
Download IS32LT3117 Datasheet


IS32LT3117
IS32LT3117
60V, 350MA, 4-CHANNEL CONSTANT CURRENT REGULATOR WITH OTP
FOR AUTOMOTIVE LIGHT
GENERAL DESCRIPTION
FEATURES
Preliminary Information
January 2014
The IS32LT3117 is designed for the automotive light.
This device is a 4-channel, linear regulated, constant
current LED driver which can provide 4 equal currents
outputs of up to 350mA per channel to drive high
brightness LEDs over an input voltage range of 6V to
60V, while maintaining an output leakage current of
less than 1µA. The output current is easily
programmed using a single, tiny external resistor. The
outputs of the IS32LT3117 can be connected in
parallel to allow greater than 350mA output current.
The IS32LT3117 also features a PWM input to enable
simple dimming control using a digital control signal.
The recommended frequency range of the PWM signal
is 4kHz ~ 100kHz.
The IS32LT3117 provides a unique over temperature
protection scheme. A hard shutdown which turns off all
LED currents occurs if the die junction temperature
exceeds the maximum value of 160°C. However, as
the die junction temperature rises up to over 130°C
(Typ.), the output current will begin to roll off at a rate
of -2.22%/°C (Typ.). If the die temperature continues to
rise above the hard shutdown temperature threshold,
the LED currents will drop to zero. When temperature
returns to 140°C (Typ.) or below, the hard shutdown
protection is released and the chip will function again.
6V to 60V input supply voltage range
Up to 1.4A total output current
Over temperature protections
Thermal current regulation above 130°C
±3% output current matching between channels
PWM dimming and shutdown control input
Optional 2.5V output to drive external standoff BJTs
Very few external components
AEC-Q100 qualified (pending)
APPLICATIONS
Automotive lighting
- Daytime running light
- Dome light
- Tail light
- Map light
- Dimmable interior lights
Industrial LED lighting
Low EMI lighting applications
Low-side constant current regulator
The IS32LT3117 also has an optional 2.5V reference
voltage output which is able to supply up to 10mA (typ.)
output current. This voltage may be used to drive the
base of the external BJTs for higher current
applications in such case, driving for a wide varying
input voltage is needed.
The IS32LT3117 is offered in eTSSOP-16 package
with operating temperature range of -40°C to +125°C.
TYPICAL APPLICATION CIRCUIT
Figure 1 IS32LT3117 Directly Driving 4 LED Strings
Integrated Silicon Solution, Inc. – www.issi.com
Rev.0A, 01/03/2014
1

IS32LT3117
IS32LT3117
Figure 2 IS32LT3117 With Optional 2.5V Output Driving 4 External Standoff BJTs
Note 1: The 33µF output capacitor should be placed as close to the LED array as possible in order to minimize the parasitic inductor
effect due to the output wiring.
Note 2: The resistor RSET should be place as close to ISET and GND pins as possible.
Note 3: If you want less than four channels, the unused channel should be connected to GND.
Integrated Silicon Solution, Inc. – www.issi.com
Rev.0A, 01/03/2014
2


Features IS32LT3117 60V, 350MA, 4-CHANNEL CONSTA NT CURRENT REGULATOR WITH OTP FOR AUTO MOTIVE LIGHT GENERAL DESCRIPTION FEAT URES Preliminary Information January 2 014 The IS32LT3117 is designed for the automotive light. This device is a 4-c hannel, linear regulated, constant curr ent LED driver which can provide 4 equa l currents outputs of up to 350mA per c hannel to drive high brightness LEDs ov er an input voltage range of 6V to 60V, while maintaining an output leakage cu rrent of less than 1µA. The output cur rent is easily programmed using a singl e, tiny external resistor. The outputs of the IS32LT3117 can be connected in p arallel to allow greater than 350mA out put current. The IS32LT3117 also featur es a PWM input to enable simple dimming control using a digital control signal . The recommended frequency range of th e PWM signal is 4kHz ~ 100kHz. The IS32 LT3117 provides a unique over temperatu re protection scheme. A hard shutdown w hich turns off all LED currents occurs if the die junction tempe.
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