MAX16819 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming

19-0706; Rev 0; 12/06
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.
Applications
Architectural, Industrial, and Ambient Lighting
Automotive RCL, DRL, and Fog Lights
MR16 and Other LED Bulbs
Indicators and Emergency Lighting
TOP VIEW
Pin Configuration
6
5
4
Features
♦ High-Side Current Sense
♦ Dedicated Dimming Control Input
♦ 20kHz Maximum Dimming Efficiency
♦ 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*
MAX16820ATT+T 6 TDFN-EP*
T633-2
T633-2
+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.
Typical Operating Circuit
V_IN
R_SENSE
L
C_IN
MAX16819
MAX16820
+
1
2
3
C_VCC
IN
V_CC
CSN ^MAX16819 DRV
MAX16820
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.