TPS92642-Q1
SLUSE50 – NOVEMBER 2023
TPS92642-Q1 Automotive Synchronous Buck Infrared LED Driver
LED current is achieved by directly modulating the
UDIM input pin with desired duty cycle. The device
incorporates an internal pulse monitoring circuit that
limits the maximum pulse duty cycle.
1 Features
•
AEC-Q100 qualified for automotive applications
– Grade 1: –40°C to 125°C ambient operating
temperature
The TPS92642-Q1 incorporates advanced diagnostic
and fault protection featuring: cycle-by-cycle switch
current limit, bootstrap undervoltage, LED open, LED
short and thermal shutdown.
– Device HBM classification level H1C
– Device CDM classification level C5
Functional Safety-Capable
– Documentation available to aid functional safety
system design
Input voltage range: 5.5 V to 36 V
– Operation down to 5.15 V after start-up
Up to 5-A pulsed output current with 4% accuracy
Adaptive on-time current control
– Low offset high-side current sense amplifier
– Stable with any combination of ceramic, and
aluminum capacitors
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The TPS92642-Q1 is available in a 6.6-mm × 5.1-mm
thermally-enhanced 16-pin HTSSOP package with
0.65-mm lead pitch.
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Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
TPS92642-Q1
HTSSOP (16)
6.60 mm × 5.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Programmable switching frequency from 100 kHz
to 2.2 MHz
Advanced dimming operation
RCS
L
LED+
– 1000:1 precision PWM dimming
– 15:1 precision analog dimming
Internal maximum duty cycle limit
Cycle-by-cycle switch overcurrent protection
Open-drain fault indicator output
– LED short circuit, open circuit and cable
harness fault indication
COUT
1
2
16
SW
SW
PGND
GND
VIN
•
•
•
CIN1
15
14
RBST
CBST
VIN
VIN
3
BST
CVCC
4
5
VCC
IADJ
RON
RUV2
RUV1
13
12
11
10
9
RON
UDIM
CSP
CSN
FLT
CCOMP
•
Thermal shutdown protection
6
7
COMP
AGND
PWM
2 Applications
CPLMT
8
PLMT
•
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Driver Monitoring Systems (DMS)
IR LED and laser driver
3 Description
Typical Buck LED Driver Application Schematic
The TPS92642-Q1 is a monolithic, synchronous Buck
LED driver with a wide 5.5-V to 36-V operating
input voltage range and 40-V tolerance that supports
load dump for duration of 400 ms. The TPS92642-
Q1 implements an adaptive on-time average current
mode control based on inductor valley current
detection. The adaptive on-time control provides
near constant switching frequency that can be set
between 100 kHz and 2.2 MHz. Inductor current
sensing and closed-loop feedback enables better than
±4% accuracy over wide input, output and ambient
temperature.
LED Pulse Limit
The high-performance infrared LED driver can
independently modulate LED current using both
analog or PWM dimming techniques. Linear analog
dimming range with over 15:1 range is obtained
by setting the IADJ voltage. PWM dimming of
Ch1: UDIM input
Ch2: PLMT voltage Ch4: LED current
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.