A6210 Buck-Regulating LED Driver

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Overview

The A6210 is a buck regulator that uses valley current-mode control. This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output LED span voltages.

Low system cost is accomplished through high switching frequencies of up to 2.0 MHz, allowing smaller and lower value inductors and capacitors. In addition, few external components are required through high levels of integration. Optimal drive circuits minimize switching losses.

The switching frequency is maintained constant, as the on-time is modulated by the input voltage. This feed-forward control ensures excellent line correction. The on-time is set by an external resistor pulled-up to the input supply.

Internal housekeeping and bootstrap supplies are provided, which require the addition of only one small ceramic capacitor. A top-off charge pump ensures correct operation at light loads.

Internal diagnostics provide comprehensive protection against input undervoltages and overtemperatures.

The device package is a 16-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

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Features & Applications

Features

• User-configurable on-time, achieving switching frequencies up to 2.0 MHz
• Brightness control through PWM of DIS pin
• Minimal external components required
• No output capacitor required
• Wide input voltage range: 9 to 46 V
• Low 0.18 V sense voltage for higher efficiency
• Output Current: up to 3.0 A
• Low standby current < 100 µA
• Thermal shutdown
• Supplied in a thermally-enhanced 4 mm QFN package

Applications

• High brightness LEDs
• LED driver modules, power supplies and lamps, such as MR16 and MR11

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Diagram

Typical Application

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Specifications

Digi-Key Part Number	Manufacturer's Part Number
620-1281-1-ND	A6210GEUTR-T

Recommended Operating Conditions

Characteristic	Symbol	Min.	Max.	Units
Supply Voltage	VIN	9	46	V
Switching Node	VLX	– 0.7	46	V
Switching Frequency Range	fSW	0.1	2.0	MHz
Operating Ambient Temperature	TA	– 40	105	°C
Junction Temperature	TJ	– 40	125	°C

Thermal Characteristics

Characteristic	Symbol	Test Conditions	Value	Units
Package Thermal Resistance, Junction to Ambient	RθJA	On 4-layer PCB based on JEDEC standard	36	°C/W
Package Thermal Resistance, Junction to Pad	RθJA	On 4-layer PCB based on JEDEC standard	2	°C/W