MAX16826ATJ+C24 Maxim Integrated Products, MAX16826ATJ+C24 Datasheet - Page 10

• Manufacturer Part Number: MAX16826ATJ+C24
• Description: LED Drivers Programmable Four-St ring HB LED Driver w
• Manufacturer: Maxim Integrated Products

Specifications of MAX16826ATJ+C24

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Programmable, Four-String HB LED Driver with
Output-Voltage Optimization and Fault Detection
The MAX16826 HB LED driver integrates a switching
regulator controller, a 4-channel linear current sink dri-
ver, a 7-bit ADC, and an I
designed to operate from a 4.75V to 24V input voltage
range and can withstand automotive load dump tran-
sients up to 40V.
The current-mode switching regulator controller is con-
figurable as a boost or SEPIC converter to regulate the
voltage to drive the four strings of HB LEDs. Its program-
mable switching frequency (100kHz to 1MHz) allows the
10
SYNC/EN
COMP
______________________________________________________________________________________
PGND
RTCT
GND
GND
OVP
RSC
CSS
SDA
SCL
V
CS
DL
CC
FB
IN
29
31
32
30
10
11
12
9
1
8
6
7
4
5
2
3
5V
GND
26V
SHUNT
CURRENT-
Detailed Description
BLOCK
MODE
PWM
V
2
CC
C interface. The IC is
OVT
OVT
V
CC
MACHINE
STATE
I
2
C
REF
OVT
OVT
MAX16826
use of a small inductor and filter capacitors. The four
current sink regulators use independent external current-
sense resistors to provide constant currents for each
string of LEDs. Four DIM inputs allow a very wide range
of independent pulsed dimming to each LED string. An
internal 7-bit ADC measures the drain voltage of the
external driver transistors to enable output voltage opti-
mization and fault monitoring of the LEDs. The
MAX16826 is capable of driving four strings of LEDs.
The number of LEDs in each string is only limited by the
topology of choice, the rating of the external compo-
nents, and the resolution of the ADC and internal DAC.
BUFFERED
AND DACS
REGISTER
DOUBLE-
Simplified Block Diagram
DECTECTION
7-BIT ADC
CURRENT-
SHORTED
DRIVERS
STRING
LINEAR
FAULT
SINK
AND
28
25
22
19
26
23
20
17
27
24
21
18
16
15
14
13
DR4
DR3
DR2
DR1
CS4
CS3
CS2
CS1
DL4
DL3
DL2
DL1
DIM4
DIM3
DIM2
DIM1