LED Driver. A6217 Datasheet


A6217 Driver. Datasheet pdf. Equivalent


A6217


PWM Dimmable Buck Regulator LED Driver
A6217 and A6217-1
Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver

FEATURES AND BENEFITS
•	AEC-Q100 qualified •	6 to 48 V supply voltage •	True average output current control •	3 A maximum output over operating temperature range
(1.5 A for A6217-1) •	Cycle-by-cycle current limit •	Integrated MOSFET switch •	Enable / PWM 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 •	 Enhancements over A6213: ▫	Dithering of switching frequency to reduce EMI ▫	Able to drive single white LED from 18 V supply at 2.2 MHz ▫	Smaller package option

PACKAGES:

10-pin DFN with wettable flank (suffix EJ)

Not to scale

8-pin SOICN (suffix LJ)

DESCRIPTION
The A6217 is a single IC switching regulator t...



A6217
A6217 and A6217-1
Automotive-Grade, Constant-Current
PWM Dimmable Buck Regulator LED Driver
FEATURES AND BENEFITS
• AEC-Q100 qualified
• 6 to 48 V supply voltage
• True average output current control
• 3 A maximum output over operating temperature range
(1.5 A for A6217-1)
• Cycle-by-cycle current limit
• Integrated MOSFET switch
• Enable / PWM 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
• Enhancements over A6213:
▫ Dithering of switching frequency to reduce EMI
▫ Able to drive single white LED from 18 V supply at 2.2 MHz
▫ Smaller package option
PACKAGES:
10-pin DFN with
wettable flank
(suffix EJ)
Not to scale
8-pin SOICN
(suffix LJ)
DESCRIPTION
The A6217 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 pulse-
width-modulation (PWM) signal at the enable pin.
The device is provided in a 3 mm × 3 mm wettable flank 10-pin
DFN (suffix EJ) or an 8-pin narrow SOIC (suffix LJ), both with
exposed pad for enhanced thermal dissipation. Both packages
are 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
VIN (6 to 48 V)
TYPICAL APPLICATION CIRCUIT
GND C1
EN
1, 2
R1 3
VIN
TON
A6217
(EJ)
SW
BOOT
9,10
8 C4
4 EN
5 CS
PAD GND 7
VCC 6
Enable/PWM Dimming
(100 Hz to 2 kHz)
C5
L1
D1
LED+
LED
RSENSE
A6217-DS

A6217
A6217 and
A6217-1
Automotive-Grade, Constant-Current
PWM Dimmable Buck Regulator LED Driver
SELECTION GUIDE
Part Number
Maximum Output
Current (A)
A6217KEJTR-J
3
A6217KEJTR-1-J
1.5
A6217KLJTR-T
3
A6217KLJTR-1-T
1.5
Package
Wettable flank 10-pin DFN with exposed thermal pad
Wettable flank 10-pin DFN with exposed thermal pad
8-pin SOICN with exposed thermal pad
8-pin SOICN with exposed thermal pad
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
Packing
Contact Factory
Contact Factory
3000 pieces per 13-in. reel
3000 pieces per 13-in. reel
Rating
–0.3 to 50
–0.3 to VIN + 8
–1.5 to VIN + 0.3
–0.3 to 7
–0.3 to VIN + 0.3
–0.3 to 7
150
–55 to 150
Unit
V
V
V
V
V
V
ºC
ºC
THERMAL CHARACTERISTICS*: May require derating at maximum conditions; see application section for optimization
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
(Junction to Ambient)
RθJA
DFN-10 (EJ) package on 4-layer PCB based on JEDEC standard
SOICN-8 (LJ) package on 4-layer PCB based on JEDEC standard
Package Thermal Resistance
(Junction to Pad)
RθJP
*Additional thermal information available on the Allegrowebsite.
Value
45
35
2
Unit
ºC/W
ºC/W
ºC/W
Pinout Diagrams
VIN
VIN
TON
EN
CS
1
2
3
4
5
PAD
10 SW
9 SW
8 BOOT
7 GND
6 VCC
Package EJ Pinouts
VIN 1
8 SW
TON 2
EN 3
PAD
7 BOOT
6 GND
CS 4
5 VCC
Package LJ Pinouts
Terminal List Table
Number
EJ LJ
1, 2 1
32
4
5
6
7
8
9, 10
3
4
5
6
7
8
Name
VIN
TON
EN
CS
VCC
GND
BOOT
SW
PAD
Function
Supply voltage input terminals
Regulator on-time setting resistor terminal;
determines the switching frequency of the converter
Input for Enable and PWM dimming; rated up to
VIN and logic-level compatible
Drive output current sense feedback
Internal linear regulator output; add filter capacitor
of 0.1 µF from this pin to GND
Ground terminal
DMOS gate driver bootstrap terminal
Switched output terminals
Exposed pad for enhanced thermal dissipation;
connect to GND
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2




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