MAX16819_15 Datasheet, PDF (6/9 Pages) Maxim Integrated Products – 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming

MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Pin Description
PIN
NAME
1
IN
2
CSN
3
DIM
4
GND
5
DRV
6
V_CC
EP
—
FUNCTION
Positive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.
Current-Sense Input
Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to enable
the current regulator.
Ground
Gate Drive Output. Connect to the gate of an external n-channel MOSFET.
Voltage Regulator Output. Connect a 1µF capacitor from V_CC to GND.
Exposed Paddle. Connect to a large-area ground plane for improved power dissipation. Do not use
as the only ground connection for the device.
Functional Diagram
IN
REGULATOR
V_CC
-
+
CSN
CS
COMPARATOR
GATE
DRV
DRIVER
BANDGAP
REF
1.23V ₊
-
UVLO
COMPARATOR
GND
DIM
DIM
BUFFER
MAX16819
MAX16820
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.
www.maximintegrated.com
Maxim Integrated │  6