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MAX16820ATTT

Description
2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming
File Size214KB,10 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX16820ATTT Overview

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

19-0706; Rev 1; 3/07
KIT
ATION
EVALU
E
BL
AVAILA
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
General Description
The MAX16819/MAX16820, step-down constant-current
high-brightness LED (HB LED) drivers provide a cost-
effective solution for automotive interior/exterior lighting,
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 applica-
tions requiring a wide input voltage range. The high-side
current-sensing and an integrated current-setting circuit-
ry minimize the number of external components while
delivering an LED current with ±5% accuracy. A hys-
teretic 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 fre-
quency, thus allowing for small component size.
The MAX16819/MAX16820 operate over the -40°C to
+125°C automotive temperature range and are avail-
able in 3mm x 3mm x 0.8mm, 6-pin TDFN packages.
o
o
o
o
o
o
o
o
o
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o
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
MAX16819/MAX16820
Ordering Information
PART
MAX16819ATT+T
MAX16820ATT+T
PIN-PACKAGE
6 TDFN–EP*
6 TDFN-EP*
PKG CODE
T633-2
T633-2
TOP
MARK
+ATB
+ATC
Note:
All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes
lead-free package.
*EP
= Exposed paddle.
Applications
Architectural, Industrial, and Ambient Lighting
Automotive RCL, DRL, and Fog Lights
MR16 and Other LED Bulbs
Indicators and Emergency Lighting
Typical Operating Circuit
V
IN
R
SENSE
C
IN
L
Pin Configuration
GND
4
DRV
5
TOP VIEW
V
CC
6
C
VCC
MAX16819
MAX16820
+
1
IN
2
CSN
3
DIM
IN
V
CC
CSN
MAX16819
MAX16820
DRV
DIM
GND
TDFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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