Datasheet

MAX16804
High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN
= 12V, C
V5
= 0.1µF, I
V5
= 0, CS- = GND, R
SENSE
= 0.56Ω (see the Typical Operating Circuit ), V
DIM
= 4V, T
A
= T
J
= -40°C
to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND ...............................................................-0.3V to +45V
DIM, OUT, EN to GND .................................-0.3V to (V
IN
+ 0.3V)
IN Slew Rate (20V < V
IN
< 45V) ...................................250mV/µs
CS+, V5 to GND .......................................................-0.3V to +6V
CS- to GND............................................................-0.3V to +0.3V
OUT Short Circuited to GND Duration
(at V
IN
< +16V).................................................................1hour
Maximum Current Into Any Pin (except IN and OUT).........±20mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TQFN (derate 34.5mW/
°
C above +70
°
C) ......2758.6mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
IN
(Note 2) 5.5 40.0 V
Ground Current I
G
I
LOAD
= 350mA 2.5 4.5 mA
Shutdown Supply Current I
SHDN
V
EN
≤ 0.3V 12 40 µA
Guaranteed Output Current I
OUT
R
SENSE
= 0.55Ω 350 mA
Output Current Accuracy
35mA < I
OUT
< 350mA, not including
R
SENSE
tolerance
3%
I
OUT
= 350mA, 12V < V
IN
< 40V 0.4 1.2
Dropout Voltage (Note 3) ΔV
DO
I
OUT
= 350mA, 6.5V < V
IN
< 12V 0.5 1.5
V
Current rising, DIM rising to 4V 17
Output Current Slew Rate
(External PWM Signal at DIM)
Current falling, DIM falling to 0.6V 17
mA/µs
Short-Circuit Current V
OUT
= 0V 600 mA
ENABLE INPUT
EN Input Current I
EN
100 nA
EN Input-Voltage High V
IH
2.8 V
EN Input-Voltage Low V
IL
0.6 V
Enable Turn–On Time t
ON
EN rising edge to 90% of OUT 250 µs
CURRENT SENSE (Note 4)
Regulated R
SENSE
Voltage V
RSENSE
V
SENSE
= V
CS+
- V
CS-
192 198 204 mV
Input Current (CS+) V
CS+
= 220mV +14 µA
Input Current (CS-) V
CS+
= 220mV -75 µA
INTERNAL RAMP GENERATOR
Internal Ramp Frequency f
RAMP
180 200 220 Hz
External Sync Frequency Range f
DIM
80 2000 Hz
External Sync Voltage Low 0.4 V
External Sync Voltage High 2.8 V
EXTERNAL PWM DIMMING INPUT
DIM Input Current 1µA
Turn-On Time t
ON
After DIM rising to 4V (Note 5) 28 52 µs
Turn-Off Time t
OFF
After DIM falling to 0.6V (Note 5) 19 38 µs