MAX16819 Maxim Integrated Products, MAX16819 Datasheet - Page 6

• Manufacturer Part Number: MAX16819
• Description: (MAX16819 / MAX16820) step-down constant-current high-brightness LED drivers
• Manufacturer: Maxim Integrated Products

2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
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
6
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PIN
EP
1
2
3
4
5
6
CSN
DIM
IN
NAME
GND
CSN
DRV
DIM
V
IN
—
CC
Detailed Description
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
Exposed Paddle. Connect to a large-area ground plane for improved power dissipation. Do not use
as the only ground connection for the device.
BANDGAP
BUFFER
DIM
REF
1.23V
COMPARATOR
COMPARATOR
REGULATOR
-
+
+
-
UVLO
CS
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 exter-
nal components while delivering LED current with a
±5% accuracy, using a 1% sense resistor. See the
Functional Diagram .
FUNCTION
CC
MAX16819
MAX16820
to GND.
DRIVER
GATE
Functional Diagram
Pin Description
V
DRV
GND
CC