IS32LT3180 Datasheet, PDF (1/16 Pages) Integrated Silicon Solution, Inc – DUAL INTENSITY, LINEAR CURRENT DRIVER FOR RCL

IS32LT3180
DUAL INTENSITY, LINEAR CURRENT DRIVER FOR RCL
Preliminary Information
December 2014
GENERAL DESCRIPTION
The IS32LT3180 is an eight channel linear current
regulator for automotive rear tail light applications such
as RCL (Rear Combination Lamps) and CHMSL
(Center High Mounted Stop Lamps). It is fully
programmable with two LED brightness levels for the
different intensity requirements of “stop” bright (DC
mode) and “tail” dim (PWM mode).
A logic level at the PWM pin is used to select between
the tail and stop output conditions. The stop condition
provides the highest intensity output, while the tail
condition utilizes an internally generated PWM signal
to reduce the intensity of the LEDs’ light output.
The sink current at the OUTx pins is easily set with a
single resistor at the STOP pin. A second resistor at
the TAIL pin sets the duty cycle of the internal PWM
oscillator for dimming (less bright) the LED output
when operating in the tail condition.
An external FET (optional) can be implemented for
operation with wide varying supply voltages.
The IS32LT3180 is offered in an eTSSOP-16 package.
FEATURES
 Output current programmable from 10mA to
75mA
 Tail duty cycle programmable from 1% to 95%
 Linear voltage regulator to optimize consumption
on device
 Low dropout voltage of 0.8V@35mA
 Slew rate control on each output for better EMI
performance
 PWM logic level input selects between full
brightness and PWM dimming levels
 FAULT reporting
 LED open/short circuit detection
 Input overvoltage protection
 STOP pin overcurrent protection
 Thermal rollback of output current
 Withstand 50V load dump
 AEC-Q100 qualification (pending)
APPLICATIONS
 Rear Combinational Lamp (RCL)
 Center High Mount Stop Light (CHMSL)
 Daytime running lamp
 Fog lamps
 Turn signal
TYPICAL APPLICATION CIRCUIT
TAIL
STOP
10k
10nF
1k
Q1
R_GS ⁵⁰
1k
220nF
C_VCC
1F
R R STOP
TAIL
3.09k 7.72k
0.1 F
3
ERC
2
VCC
6
FAULT
1
OUT1
5
IS32LT3180
PWM
9
7
OUT8
STOP
8
4
TAIL
FB
13
GND
V_STRING
RFB1
8.87k
RFB2
1k
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. 0A, 12/09/2014