MAX16832A/MAX16832C
2MHz, High-Brightness LED Drivers with
Integrated MOSFET and High-Side Current Sense
5
LX
RDSON
vs. TEMPERATURE
MAX16832A toc11
TEMPERATURE (°C)
LX
RDSON
(Ω)
1109580655035205-10-25
0.2
0.3
0.4
0.5
0.6
0.7
0.1
-40 125
V
IN
= 6.5V
V
IN
= 65V
V
IN
= 48V
I
TEMP_I
vs. TEMPERATURE
MAX16832A toc12
I
TEMP_I
(µA)
25.5
26.0
26.5
27.0
27.5
28.0
28.5
29.0
29.5
30.0
25.0
TEMPERATURE (°C)
1109580655035205-10-25-40 125
V
IN
= 48V
Typical Operating Characteristics (continued)
(V
IN
= V
DIM
= 48V, R
SENSE
= 0.3Ω, L = 220µH (connected between IN and CS). Typical values are at T
A
= +25°C, unless otherwise
noted.)
Pin Description
PIN NAME FUNCTION
1 CS Current-Sense Input. Connect a resistor between IN and CS to program the LED current.
2 IN Positive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.
3 GND Ground
4 PGND Power Ground
5, 6 LX Switching Node
7 DIM
Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to
enable the current regulator.
8 TEMP_I
Thermal Foldback Control and Linear Dimming Input. Bypass with a 0.01µF capacitor to GND if
thermal foldback or analog dimming is used. See the Thermal Foldback section.
—EP
Exposed Pad. Connect EP to a large-area ground plane for effective power dissipation. Do not use
as the IC ground connection.
Detailed Description
The MAX16832A/MAX16832C are step-down, constant-
current, HB LED drivers. These devices operate from a
+6.5V to +65V input voltage range. The maximum output
is 1A, if the part is used at temperatures up to T
A
=
+105°C, or 700mA, if it is used up to T
A
= +125°C. A
high-side current-sense resistor sets the output current
and a dedicated PWM dimming input enables pulsed
LED dimming over a wide range of brightness levels.
A high-side current-sensing scheme and an on-board
current-setting circuitry minimize the number of exter-
nal components while delivering LED current with ±3%
accuracy, using a 1% sense resistor. See Figure 1 for a
functional diagram.
