Datasheet

Detailed Description
The MAX16819/MAX16820 are step-down, constant-
current, high-brightness LED (HB LED) drivers. These
devices operate from a 4.5V to 28V input voltage range
and provide up to 0.5A of source and 1A of sink drive
capability to the gate of an external MOSFET. A high-
side current-sense resistor sets the output current and a
dedicated PWM dimming input (DIM) allows for a wide
range of independent pulsed dimming.
The high-side current-sensing scheme and on-board
current-setting circuitry minimize the number of external
components while delivering LED current with a ±5%
accuracy, using a 1% sense resistor. See the Functional
Diagram.
PIN NAME FUNCTION
1 IN Positive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.
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 V
CC
Voltage Regulator Output. Connect a 1µF capacitor from V
CC
to GND.
EP —
Exposed Paddle. Connect to a large-area ground plane for improved power dissipation. Do not use
as the only ground connection for the device.
MAX16819
MAX16820
REGULATOR
CS
COMPARATOR
UVLO
COMPARATOR
1.23V
BANDGAP
REF
GATE
DRIVER
DIM
BUFFER
V
CC
DRV
GND
+
-
-
+
CSN
IN
DIM
MAX16819/MAX16820 2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
www.maximintegrated.com
Maxim Integrated │ 6
Pin Description
Functional Diagram