19-0706; Rev 1; 3/07
KIT
ATION
EVALU
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B
AVAILA
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
The MAX16819/MAX16820, step-down constant-current
high-brightness LED (HB LED) drivers provide a costeffective 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 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.
Applications
Architectural, Industrial, and Ambient Lighting
Features
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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
Ordering Information
PART
PIN-PACKAGE
PKG CODE
TOP
MARK
MAX16819ATT+T
6 TDFN–EP*
T633-2
+ATB
MAX16820ATT+T
6 TDFN-EP*
T633-2
+ATC
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
Automotive RCL, DRL, and Fog Lights
MR16 and Other LED Bulbs
Typical Operating Circuit
Indicators and Emergency Lighting
VIN
RSENSE
Pin Configuration
VCC
DRV
GND
TOP VIEW
6
5
L
CIN
4
CVCC
MAX16819
MAX16820
CSN
+
MAX16819
MAX16820
DRV
3
DIM
2
CSN
IN
1
VCC
IN
DIM
GND
TDFN
________________________________________________________________ Maxim Integrated Products
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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MAX16819/MAX16820
General Description
