MAX16820：2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming

High-Brightness Step-Down LED Driver Controllers with High-Side Current-Sensing and Rapid Current-Pulsing Capability

The MAX16819/MAX16820, step-down constant-current high-brightness LED (HB LED) drivers provide a cost-effective solution for architectural and ambient lighting, LED bulbs such as MR16 and other LED illumination applications. The MAX16819/MAX16820 operate from a 4.5V to 28V input voltage range and feature a 5V/10mA on-board regulator. A high-side current-sense resistor adjusts the output current and a dedicated PWM input (DIM) enables a wide range of pulsed dimming. The MAX16819/MAX16820 are well suited for applications requiring a wide input voltage range. The high-side current-sensing and an integrated current-setting circuitry minimize the number of external components while delivering an LED current with ±5% accuracy. A hysteretic control algorithm ensures excellent input-supply rejection and fast response during load transients and PWM dimming. The MAX16819 features a 30% inductor current ripple and the MAX16820 features a 10% current ripple. These devices operate up to 2MHz switching frequency, thus allowing for small component size. The MAX16819/MAX16820 operate over the -40°C to +125°C automotive temperature range and are available in 3mm x 3mm x 0.8mm, 6-pin TDFN packages.

Key Features

Simple High-Power LED Lighting Design with Accurate LED Current Control
- Over 25W Output Power
- High-Side Current Sense
- Adjustable Constant LED Current
- ±5% LED Current Accuracy
- 4.5V to 28V Input Voltage Range
Wide Dimming Range (5000:1)
- Dedicated Dimming-Control Input
- 20kHz Maximum Dimming Frequency
Minimizes Number of Components to Save Space and Cost
- Hysteretic Control: No Compensation
- Up to 2MHz Switching Frequency
- 5V, 10mA On-Board Regulator

MAX16819, MAX16820: Typical Operating Circuit

Applications/Uses

Architectural, Industrial, and Ambient Lighting
Heads-Up Display
Indicators and Emergency Lighting

DataSheet

title	Download file
MAX16819-MAX16820 Data Sheet	MAX16819-MAX16820.pdf

Parametrics

Part Number	Regulation Topology	Max. No. of LEDs	LED Channels	LED Configuration	I_LED per Channel (A)	PWM Dimming Freq. (kHz)	Dimming Ratio	Dimming Control	V_DROPOUT (mV)	V_{CURR_SENSE} (mV)	P_OUT (W)	V_IN (V)	V_IN (V)	I_CC (mA)	LED String Volt. (V)	Oper. Freq. (kHz)	Package/Pins	Budgetary Price
Part Number	Regulation Topology	Max. No. of LEDs	LED Channels	LED Configuration	max	max	max	Dimming Control	typ	V_{CURR_SENSE} (mV)	P_OUT (W)	min	max	max	max	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX16819	Inductor Based	6	1	Series	3	20	5000	PWM	500	170	25	4.5	28	1.5	26	2000	TDFN-EP/6	$0.90 @1k
MAX16820	Inductor Based	6	1	Series	3	20	5000	PWM	500	190	25	4.5	28	1.5	26	2000	TDFN-EP/6	$0.90 @1k