Document
A6213 and A6213-1
Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver
FEATURES AND BENEFITS
• AEC-Q100 qualified • Supply voltage 6 to 48 V • True average output current control • 3 A maximum output over operating temperature range
(1.5 A for A6213-1) • Cycle-by-cycle current limit • Integrated MOSFET switch • Dimming via direct logic input or power supply voltage • Internal control loop compensation • Undervoltage lockout (UVLO) and thermal shutdown
protection • Low power shutdown (1 µA typical) • Robust protection against:
▫ Adjacent pin-to-pin short ▫ Pin-to-GND short ▫ Component open/short faults
PACKAGE: 8-pin SOICN with exposed thermal pad (suffix LJ):
Not to scale
DESCRIPTION
The A6213 is a single IC switching regulator that provides constant-current output to drive high-power LEDs. It integrates a high-side N-channel DMOS switch for DC-to-DC step- down (buck) conversion. A true average current is output using a cycle-by-cycle, controlled on-time method.
Output current is user-selectable by an external current sense resistor. Output voltage is automatically adjusted to drive various numbers of LEDs in a single string. This ensures the optimal system efficiency.
LED dimming is accomplished by a direct logic input pulsewidth modulation (PWM) signal at the enable pin.
The device is provided in a compact 8-pin narrow SOIC package (suffix LJ) with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte-tin leadframe plating.
APPLICATIONS:
Automotive lighting • Daytime running lights • Front and rear fog lights • Turn/stop lights • Map light • Dimmable interior lights
TYPICAL APPLICATION CIRCUIT
VIN (6 to 48 V)
GND C1 R1
EN
Enable/PWM Dimming (100 Hz to 2 kHz)
1 VIN
2 TON 3 EN 4 CS
A6213 SW 8 BOOT 7
C4
PAD GND 6 VCC 5
C5
L1 D1
...
LED+
LED– RSENSE
A62131-DS, Rev. 9 MCO-0000885
January 21, 2013
June 11, 2021
A6213 and A6213-1
Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver
SELECTION GUIDE
Part Number A6213KLJTR-T A6213KLJTR-1-T
Operating Ambient Temperature, TA
–40°C to 125°C
–40°C to 125°C
Package
8-pin SOICN with exposed thermal pad 8-pin SOICN with exposed thermal pad
Packing
3000 pieces per 13-in reel 3000 pieces per 13-in reel
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Supply Voltage Bootstrap Drive Voltage Switching Voltage Linear Regulator Terminal Enable and TON Voltage Current Sense Voltage Maximum Junction Temperature Storage Temperature
VIN VBOOT VSW
VCC VEN , VTON
VCS TJ(max)
Tstg
VCC to GND
Notes
Rating
Unit
–0.3 to 50
V
–0.3 to VIN + 8
V
–1.5 to VIN + 0.3
V
–0.3 to 7
V
–0.3 to VIN + 0.3
V
–0.3 to 7
V
150
°C
–55 to 150
°C
THERMAL CHARACTERISTICS*: may require derating at maximum conditions; see application section for optimization
Characteristic
Symbol
Test Conditions*
Value
Package Thermal Resistance (Junction to Ambient)
On 4-layer PCB based on JEDEC standard
35
RθJA
On 2-layer generic test PCB with 0.8 in.2 of copper area each side
62
Package Thermal Resistance (Junction to Pad)
RθJP
2
*Additional thermal information available on the Allegro website.
Unit °C/W °C/W
°C/W
Pinout Diagram
VIN 1
8 SW
TON 2
7 BOOT
PAD
EN 3
6 GND
CS 4
5 VCC
Terminal List Table
Number
Name
1
VIN
2
TON
3
EN
4
CS
5
VCC
6
GND
7
BOOT
8
SW
–
PAD
Function Supply voltage input terminals Regulator on-time setting resistor terminal Logic input for Enable and PWM dimming Drive output current sense feedback Internal linear regulator output Ground terminal DMOS gate driver bootstrap terminal
Switched output terminals
Exposed pad for enhanced thermal dissipation; connect to GND
2
Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com
A6213 and A6213-1
Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver
FUNCTIONAL BLOCK DIAGRAM
CVCC VCC
CBOOT
BOOT
SW
L1 D1
LED String
VIN
VIN
VREG 5.3 V
VCC UVLO
TON RON
~VOUT
On-Time Current Generator
Dithering (±5%)
EN
+
VIL = 0.4 V –
VIH = 1.8 V
CCOMP
+
+
0.2 V –
–
On-Time Timer
Off-Time Timer
Average
Gate Drive UVLO Shutdown
IC and Driver Control Logic
Level Shift
Current Limit
Off-Time
Timer
ILIM
VCC UVLO
Thermal Shutdown
– +
Buck Switch Current Sense
CS
PAD
GND
RSENSE
3
Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com
A6213 and A6213-1
Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver
ELECTRICAL CHARACTERISTICS: Valid at VIN = 24 V, TA = –40°C to 125°C, typical values at TA = 25°C, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Input Supply Voltage VIN Undervoltage Lockout Threshold VIN Undervoltage Lockout Hysteresis VIN Pin Supply Current VIN Pin Shutdown Current
Buck Switch Current Limit Threshold
VIN VUV.