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General Description

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 illumina-

tion 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 applica-

tions requiring a wide input voltage range. The high-side

current-sensing and an integrated current-setting circuitry

minimize the number of external components while deliv-

ering an LED current with ±5% accuracy. A hysteretic

control algorithm ensures excellent input-supply rejection

and fast response during load transients and PWM dim-

ming. 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.

Applications

● Architectural, Industrial, and Ambient Lighting

● MR16 and Other LED Bulbs

● Indicators and Emergency Lighting

Features

● High-Side Current Sense

● Dedicated Dimming Control Input

● 20kHz Maximum Dimming Frequency

● Hysteretic Control: No Compensation

● Up to 2MHz Switching Frequency

● ±5% LED Current Accuracy

● Adjustable Constant LED Current

● 4.5V to 28V Input Voltage Range

● Over 25W Output Power

● 5V, 10mA On-Board Regulator

● -40°C to +125°C Operating Temperature Range

19-0706; Rev 2; 8/14

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

+Denotes lead-free package.

*EP = Exposed pad.

PART PIN-PACKAGE PKG CODE

TOP

MARK

MAX16819ATT+T 6 TDFN–EP* T633-2 +ATB

MAX16820ATT+T 6 TDFN-EP* T633-2 +ATC

MAX16819

MAX16820

CSN

DIM

DRV

GND

VCC

SENSE

2 3

6 5 4

DIM

CSN

GND

DRV

MAX16819

MAX16820

TDFN

TOP VIEW

MAX16819/MAX16820 2MHz High-Brightness LED Drivers with

High-Side Current Sense and 5000:1 Dimming

Typical Operating Circuit

Pin Conguration

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (9 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming General Description The MAX16819/MAX16820, step-down constantcurrent 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.
PAGE 2
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Absolute Maximum Ratings IN, CSN, DIM to GND............................................-0.3V to +30V VCC, DRV to GND ...................................................-0.3V to +6V CSN to IN..............................................................-0.3V to +0.3V Maximum Current into Any Pin (except IN, VCC, and DRV)...........................................
PAGE 3
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Electrical Characteristics (continued) (VIN = 12V, VDIM = VIN, CVCC = 1µF, RSENSE = 0.5Ω, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GATE DRIVER Gate Driver Source Current VCSN = VIN, VDRV = 0.5 x VCC Gate Driver Sink Current VCSN = VIN - 250mV, VDRV = 0.
PAGE 4
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Typical Operating Characteristics L = 47µH 85 80 75 70 65 5 10 15 20 25 30 LED 3 LED 2 LED 1 L = 47µH 4 VIN (V) VCC vs. VIN 5.4 16 20 24 28 LED 1 5.38 5.37 5.1 5.36 5.0 4.9 5.34 5.33 4.7 5.32 ILED = 0 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 VIN = 12V 5.35 4.8 4.6 VIN = 24V 5.39 5.2 0 -0.5 -1.0 -1.5 -2.0 LED 4 LED 3 5 10 15 5.30 25 30 SUPPLY CURRENT vs.
PAGE 5
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Typical Operating Characteristics (continued) (VIN = VDIM = 12V, CVCC = 1µF, RSENSE = 0.5Ω connected between IN and CSN. Typical values at TA = +25°C, unless otherwise noted.
PAGE 6
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Pin Description PIN NAME 1 IN FUNCTION 2 CSN Current-Sense Input 3 DIM Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to enable the current regulator. 4 GND Ground 5 DRV Gate Drive Output. Connect to the gate of an external n-channel MOSFET. 6 VCC Voltage Regulator Output. Connect a 1µF capacitor from VCC to GND.
PAGE 7
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Undervoltage Lockout (UVLO) The MAX16819/MAX16820 include a 4.5V undervoltage lockout (UVLO) with 500mV hysteresis. When VIN falls below 4.5V, DRV goes low, turning off the external n-channel MOSFET. DRV goes high once VIN is 5V or higher. 5V Regulator VCC is the output of a 5V regulator capable of sourcing 10mA. Bypass VCC to GND with a 1µF capacitor.
PAGE 8
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming MOSFET Selection The MAX16819/MAX16820’s gate driver is capable of sourcing 0.5A and sinking 1A of current. MOSFET selection is based on the maximum input operating voltage VIN, output current ILED, and operating switching frequency. Choose a MOSFET that has a higher breakdown voltage than the maximum operation voltage, low RDS(ON), and low total charge for better efficiency.
PAGE 9
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 12/06 Initial release 1 3/07 Revision 2 8/14 No /V OPNs; removed automotive reference from Applications and third line in General Description sections DESCRIPTION — 1, 4, 10 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.