A6267
Automotive High Current LED Controller
Features and Benefits
▪ AEC Q100 Grade 0 Automotive Qualified
▪ Constant current LED drive
▪ 6.5 to 50 V supply
▪ Boost or buck-boost modes
▪ Drives up to 15 LEDs in series
▪ Programmable switching frequency 100 to 700 kHz
▪ Open LED overvoltage indication and protection
▪ Single and multiple LED short indication
▪ LED short to ground and supply protection
▪ PWM dimming control
Description
The A6267 is a DC-to-DC converter controller, providing a
programmable constant current output for driving high power
LEDs in series. Driving the LEDs in series ensures identical
currents and uniform brightness. For automotive applications,
optimumperformanceisachievedwhendrivingupto15LEDs
at currents up to 1 A.
TheA6267 provides a cost-effective solution using an external
logic-level MOSFET and minimum additional external
components. The maximum LED current is set with a single
external sense resistor and can be modified using a current
reference input. Direct PWM control is possible via the Enable
input, which also provides a shutdown mode.
▪ 10 μA shutdown current including LED leakage
Applications:
ThisDC-DCconvertercanbeconfiguredasaground-referenced
boost converter or as a supply-referenced boost converter
providingbuck-boostcapability.Thebuck-boosttopologyused
ensures that there is no leakage path through the LEDs when
in shutdown and no inrush current at power-up.
▪ Automotive high power LED lighting systems
▪ Fog lights, reversing lights, daytime running lights
▪ Headlights
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Integrated diagnostics and two fault outputs give indication of
undervoltage, chip overtemperature, output open circuit, LED
short circuit and LED undercurrent, and can be configured to
provide short to supply and short to ground protection for the
LED connections. A unique feature is the ability to detect one
or more shorted LEDs.
Thedeviceisprovidedina16-pinTSSOPpackagewithexposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Not to scale
Typical Application Diagrams
VBAT 12 V or 24 V(50 V max)
Power net
V
BAT 12 V or 24 V (50 V max)
Power net
VIN
VIN
VREG
VREG
LN
LP
LN
LP
Buck Boost Mode
VBAT(min) Maximum
Boost Mode
VBAT(min)
Maximum
Quantity of
LEDs
FF1
FF2
FF1
FF2
Fault
Flags
Fault
Flags
(V)
Quantity of
LEDs
(V)
LF
LF
7
8
9
10
11
13
7
8
9
12
13
15
A6267
A6267
EN
EN
Enable
Enable
SG
SP
SG
SP
Vf of each LED = 3.5 V,
D(max) = 85%
Vf of each LED = 3.5 V,
D(max) = 85%
IREF
CKOUT
IREF
CKOUT
SN
LA
OSC
OSC
SN
LA
GND
GND
Buck-Boost Mode
(Supply-referenced boost)
Boost Mode
A6267-DS, Rev. 3