A6211GLJTR-T

. . . A6211 Constant-Current 3-Ampere PWM Dimmable Buck Regulator LED Driver FEATURES AND BENEFITS DESCRIPTION Supply voltage 6 to 48 V The A6211 is a single IC switching regulator that provides True average output current control constant-current output to drive high-power LEDs. It integrates 3 A maximum output over operating temperature range a high-side N-channel DMOS switch for DC-to-DC step- down Cycle-by-cycle current limit (buck) conversion. A true average current is output using a Integrated MOSFET switch cycle-by-cycle, controlled on-time method. Dimming via direct logic input or power supply voltage Output current is user-selectable by an external current sense Internal control loop compensation resistor. Output voltage is automatically adjusted to drive Undervoltage lockout (UVLO) and thermal shutdown various numbers of LEDs in a single string. This ensures the protection optimal system efficiency. Low power shutdown (1 A typical) Robust protection against: LED dimming is accomplished by a direct logic input pulse- Adjacent pin-to-pin short width modulation (PWM) signal at the enable pin. Pin-to-GND short The device is provided in a compact 8-pin narrow SOIC package Component open/short faults (suffix LJ) with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte-tin leadframe plating. Package: 8-pin SOICN with exposed ther- mal pad (suffix LJ): APPLICATIONS: General illumination Scanners and multifunction printers (light bars) Architectural lighting Industrial lighting Display case lighting / MR16 Not to scale V (6 to 48 V) IN L1 LED+ C1 GND 1 8 VIN SW D1 A6211 R1 C4 2 7 TON BOOT 3 6 EN GND EN PAD 5 4 VCC CS C5 Enable/PWM Dimming LED (100 Hz to 2 kHz) RSENSE Typical Application Circuit A6211-DS, Rev. 5Constant-Current 3-Ampere PWM Dimmable A6211 Buck Regulator LED Driver SPECIFICATIONS Selection Guide Operating Ambient Part Number Package Packing Temperature, T A A6211GLJTR-T 40C to 105C 8-pin SOICN with exposed thermal pad 3000 pieces per 13-in reel Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Supply Voltage V 0.3 to 50 V IN Bootstrap Drive Voltage V 0.3 to V + 8 V BOOT IN Switching Voltage V 1.5 to V + 0.3 V SW IN Linear Regulator Terminal V VCC to GND 0.3 to 7 V CC Enable and TON Voltage V , V 0.3 to V + 0.3 V EN TON IN Current Sense Voltage V 0.3 to 7 V CS Operating Ambient Temperature T G temperature range 40 to 105 C A Maximum Junction Temperature T (max) 150 C J Storage Temperature T 55 to 150 C stg Thermal Characteristics*: may require derating at maximum conditions see application section for optimization Characteristic Symbol Test Conditions* Value Unit On 4-layer PCB based on JEDEC standard 35 C/W Package Thermal Resistance R JA (Junction to Ambient) 2 On 2-layer generic test PCB with 0.8 in. of copper area each side 62 C/W Package Thermal Resistance R 2 C/W JP (Junction to Pad) *Additional thermal information available on the Allegro website. Terminal List Table 8 SW VIN 1 Number Name Function 1 VIN Supply voltage input terminals 7 TON 2 BOOT 2 TON Regulator on-time setting resistor terminal PAD 3 EN Logic input for Enable and PWM dimming 4 CS Drive output current sense feedback 6 3 GND EN 5 VCC Internal linear regulator output 6 GND Ground terminal 5 VCC CS 4 7 BOOT DMOS gate driver bootstrap terminal 8 SW Switched output terminals Pinout Diagram PAD Exposed pad for enhanced thermal dissipation connect to GND Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com