The MAX20050–MAX20053 are high-brightness LED (HB
LED) drivers for automotive exterior lighting applications.
Consisting of a fully synchronous step-down converter
with integrated MOSFETs, the devices are capable of
driving a series string of LEDs at up to 2A, with a minimum
number of external components. The MAX20050/
MAX20052 utilize internal loop compensation to minimize
component count, while the MAX20051/MAX20053/MAX20053D use
external compensation for full flexibility.
The wide 4.5V to 65V input supply range supports extreme
automotive cold crank and load-dump conditions. A low- and
high-switching frequency option (400kHz or 2.1MHz)
provides the designer with the flexibility to optimize for
solution size or efficiency, while avoiding interference
within the AM band. Spread spectrum provides further
options for the designer to reduce EMI at the system level.
The MAX20050/MAX20051 have an internal switching
frequency of 400kHz, while the MAX20052/MAX20053
have an internal switching frequency of 2.1MHz. In addition,
the MAX20051B has spread spectrum disabled.
High-side current regulation means only a single
connection to the LED string is required; grounding of the
string can be done locally. In addition to PWM dimming,
the ICs provide analog dimming using the REFI pin. Fullscale
current regulation accuracy is ±2.5%, while the
accuracy is ±8% at 10% of full-scale over the full temperature
range of -40°C to +125°C. A 5V, 10mA LDO output is
available for biasing other circuits.
Fault-protection mechanisms include output overload,
short-circuit, and device overtemperature protection. The
devices are specified for operation over the full -40°C to
+125°C temperature range and are available in thermally
enhanced 12-pin (3mm x 3mm) TDFN, 14-pin (5mm x
4.4mm) TSSOP, and 24-pin TQFN (4mm x 4mm) packages
with an exposed pad.
Design Solution: Driver Monitoring Systems Need a New Breed of IR-LED
Drivers ›
Applications
- Clearance Lamps (CLLs)
- Commercial, Industrial, and Architectural Lighting
- Corner Lamps (CLs)
- Daytime Running Lamps (DRLs)
- Driver Monitoring Systems (DMS)
- Fog Lamps
- Head Lamps
- Rear Lamps
