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MAX16826
Programmable, Four-String HB LED Driver with
Output-Voltage Optimization and Fault Detection
Simplified Block Diagram
IN 29
26V
SHUNT
V CC
OVT
OVT
REF
OVT
V CC 31
5V
GND
V CC
7-BIT ADC
AND
SHORTED
STRING
28 DR4
25 DR3
22 DR2
OVP 9
FAULT
DECTECTION
19 DR1
DL 32
PGND 1
CS 30
OVT
26 CS4
FB 8
RSC 10
CSS 6
CURRENT-
MODE
PWM
BLOCK
I 2 C
DOUBLE-
23 CS3
20 CS2
17 CS1
COMP 7
RTCT 4
SYNC/EN 5
STATE
MACHINE
BUFFERED
REGISTER
AND DACS
LINEAR
CURRENT-
SINK
DRIVERS
27 DL4
24 DL3
21 DL2
18 DL1
GND 2
GND 3
SDA 11
MAX16826
16 DIM4
15 DIM3
14 DIM2
SCL 12
Detailed Description
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 2 C interface. The IC is
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
13 DIM1
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.
Maxim Integrated
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相关代理商/技术参数
MAX16826ATJ+T 功能描述:LED照明驱动器 Prog 4-String HB RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16826ATJ+TC24 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Tape and Reel
MAX16826BATJ/V+ 功能描述:LED照明驱动器 Prog 4-String HB RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16826BATJ/V+T 功能描述:LED照明驱动器 Prog 4-String HB RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16826BATJ+ 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Rail/Tube
MAX16826BATJ+T 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Tape and Reel
MAX16826EVKIT+ 制造商:Maxim Integrated Products 功能描述:EVAL KIT FOR THE MAX16826 - Boxed Product (Development Kits)
MAX16826-SMP 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Tape and Reel