A6266 Datasheet, PDF (1/17 Pages) Allegro MicroSystems – The A6266 is a boost converter controller, providing a programmable constant current output for driving high power LEDs in series.

A6266
Automotive, Boost, High Current LED Controller
Features and Benefits
▪ AEC Q100 Grade 0 Automotive Qualified
▪ Constant current LED drive
▪ 5 to 50 V supply
▪ Boost mode
▪ 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
Applications:
▪ Automotive high power LED lighting systems
▪ Fog lights, reversing lights, daytime running lights
▪ Headlights
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Description
The A6266 is a boost 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,
optimum performance is achieved when driving up to 15 LEDs
at currents up to 1 A.
The A6266 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.
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.
The device is provided in a 16-pin TSSOP package with exposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Not to scale
Typical Application Diagram
V_BAT 12 V or 24 V(50 V max)
Power net
Boost Mode
V_BAT(min)
(V)
Maximum
Quantity of
LEDs
6
10
7
12
8
13
9
15
V_f of each LED = 3.5 V,
D = 85%
Fault
Flags
Enable
VIN
VREG
LN
LP
FF1
FF2
A6266 ^LF
EN
SG
IREF
SP
CKOUT
OSC
SN
GND ^LA
A6266-DS, Rev. 2