MAX16800ATE+T Maxim Integrated Products, MAX16800ATE+T Datasheet - Page 6

• Manufacturer Part Number: MAX16800ATE+T
• Description: IC LED DRIVR HIGH BRIGHT 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: HBLED Driverr

Specifications of MAX16800ATE+T

• Topology: Linear (LDO), PWM
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Type - Secondary: High Brightness LED (HBLED)
• Voltage - Supply: 6.5 V ~ 40 V
• Voltage - Output: 5.27V
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 350mA
• Internal Switch(s): Yes
• Operating Supply Voltage: 6.5 V to 40 V
• Maximum Power Dissipation: 2666.7 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Efficiency: -
• Lead Free Status / Rohs Status: Details

High-Voltage, 350mA, Adjustable Linear
High-Brightness LED (HB LED) Driver
power series pass device (see the Functional
Diagram ). The regulation point is factory set at (V
V
defined by the value of R
The MAX16800 is a current controller internally opti-
mized for driving the impedance range expected from
one or more HB LEDs.
The MAX16800 includes a fixed +5V output regulator
that delivers up to 4mA of load current for low-power
applications throughout the +6.5V to +40V input volt-
age range. Connect a 0.1µF compensation capacitor
from V5 to ground. Shorting V5 to ground disables the
thermal shutdown.
The MAX16800 enters a thermal-shutdown mode in the
event of overheating. This typically occurs in overload or
output short-circuit conditions. When the junction tem-
perature exceeds T
mal-protection circuitry turns off the series pass device.
The MAX16800 recovers from thermal-shutdown mode
once the junction temperature drops by 23°C (typ). The
part will therefore protect itself by thermally cycling in the
event of a short-circuit or overload condition.
The MAX16800 uses a sense resistor across CS+ and
CS- to set the LED current. The differential sense ampli-
Figure 1. Pulse Application with V
6
CS-
V
V
IN
EN
_______________________________________________________________________________________
) = 204mV ±3.5%. The regulated current is user
C1
1
2
3
4
OUT
IN
IN
N.C.
Applications Information
Programming the LED Current
OUT
N.C.
16
5
J
MAX16800
N.C.
= +155°C (typ), the internal ther-
15
EN
6
SENSE
N.C.
N.C.
14
7
IN
Thermal Protection
.
N.C.
N.C.
13
at a Constant Voltage
8
GND
CS+
CS-
V5
+5V Regulator
12
11
10
9
C2
D1
R
SENSE
CS+
I
LED
-
fier connected across R
immunity and low-frequency noise rejection. The LED
current is given by the equation below:
For proper operation, the minimum input voltage must
always be +1.2V (+1.5V for V
worst-case sum of all the forward drops of all series-
connected LEDs to the output of the MAX16800. The
minimum operating voltage of the device is +6.5V. The
device will operate below +6.5V; however, output cur-
rent may not meet the full regulation specification (see
the Typical Operating Characteristics ).
The MAX16800 provides pulsed or chopped current
dimming. Generally, high-brightness LEDs are binned
to match at their full-rated current; however, LEDs from
the same bin exhibit poor matching at currents other
than full-rated current. To achieve uniformity, HB LED
manufacturers recommend PWM pulsing of the LED
current at their full-rated value. There are two methods
for producing a PWM output. One method is by pulsing
the enable input (EN) while having a constant voltage
at IN. The other method is to connect EN to IN and
pulse both EN and IN. Both methods generate a regu-
lated-amplitude PWM current (variable duty cycle) that
can provide control over the LED brightness (see
Figures 1 and 2).
Figure 2. Pulse Application with EN Connected to V
C1
V
IN
Low-Frequency PWM at the Output
1
2
3
4
OUT
IN
IN
N.C.
I
LED
Input Voltage Considerations
OUT
N.C.
16
5
= V
MAX16800
N.C.
15
EN
6
SENSE
SENSE
N.C.
N.C.
14
7
IN
/ R
<+12V) higher than the
N.C.
N.C.
13
provides ground-loop
8
SENSE
GND
CS+
CS-
V5
12
11
10
9
IN
C2
D1
R
SENSE
I
LED