MAX16832A_15 Datasheet, PDF (5/10 Pages) Maxim Integrated Products – 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense

MAX16832A/MAX16832C
2MHz, High-Brightness LED Drivers
with Integrated MOSFET and
High-Side Current Sense
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.)
LXRDSON
vs. TEMPERATURE
0.7
VIN = 65V
0.6
VIN = 48V
0.5
0.4
VIN = 6.5V
0.3
0.2
0.1
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
ITEMP_I
vs. TEMPERATURE
30.0
29.5
29.0
28.5
28.0
27.5
27.0
26.5
26.0
25.5
VIN = 48V
25.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Pin Description
PIN
NAME
1
CS
2
IN
3
GND
4
PGND
5, 6
LX
7
DIM
8
TEMP_I
—
EP
FUNCTION
Current-Sense Input. Connect a resistor between IN and CS to program the LED current.
Positive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.
Ground
Power Ground
Switching Node
Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to
enable the current regulator.
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.
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.
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