MAX16804ATP+ Maxim Integrated Products, MAX16804ATP+ Datasheet - Page 8

• Manufacturer Part Number: MAX16804ATP+
• Description: LED Drivers IC LED DRIVER HIGH BRIGHT
• Manufacturer: Maxim Integrated Products

Specifications of MAX16804ATP+

• Low Level Output Current: 35 mA
• High Level Output Current: 350 mA
• Operating Supply Voltage: 5.5 V to 40 V
• Maximum Power Dissipation: 2758.6 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-20
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
With a minimum number of external components, the
MAX16804 provides LED current thermal foldback
using a negative temperature coefficient (NTC) thermis-
tor. Figure 3 shows a thermistor connected to V5 and
the CS+ of the MAX16804. As the temperature increas-
es, the voltage drop across R2 increases causing the
LED current to decrease.
Figure 3. LED Current Thermal Foldback Operation with an NTC Thermistor
Figure 4. Increased Output Current (Ampere Range) with a Single BJT
8
_______________________________________________________________________________________
I
LED
= [V
SENSE
LED Current Thermal Foldback
V
IN
V
- [R2/(R2 + RT)] x V5]/R1
IN
C1
PWM DIMMING
C1
PWM DIMMING
IN
EN
DIM
GND
IN
EN
DIM
GND
MAX16804
(4)
MAX16804
Figure 4 shows an application circuit with the
MAX16804 using a single BJT to provide high output
current. For proper operation:
where V
of the external BJT.
V
OUT
CS+
CS-
IN(MIN)
V5
OUT
CS+
CS-
V5
CESAT(MAX)
> V
C2
CESAT(MAX)
C2
RT
is the maximum saturation voltage
R2
+ V
LEDs
Q1
R
FT(MAX)
SENSE
Other Applications
LEDs
R1
+ V
RSENSE
(5)