Rainbow Electronics MAX16820 - Manual

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
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
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+ Denotes lead-free package.
* EP = Exposed paddle.
MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
________________________________________________________________ Maxim Integrated Products 1
1
+
2 3
6 5 4
DIM CSN
IN
GND DRV V
CC
MAX16819
MAX16820
TDFN
TOP VIEW
PART PIN-PACKAGE PKG CODE
TOP
MARK
MAX16819ATT+T 6 TDFN–EP* T633-2 +ATB
MAX16820ATT+T 6 TDFN-EP* T633-2 +ATC
Pin Configuration
Ordering Information
MAX16819
MAX16820
IN
CSN
DIM
V
CC
C IN
DRV
GND
C VCC
V IN
L R
SENSE
Typical Operating Circuit
19-0706; Rev 1; 3/07
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.