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MAX16832A_10

更新时间： 2024-11-19 11:18:23
品牌 Logo 应用领域
美信 - MAXIM 驱动器
页数 文件大小 规格书
10页 229K
描述
2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense

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19-4140; Rev 3; 2/10  
2MHz, High-Brightness LED Drivers with  
Integrated MOSFET and High-Side Current Sense  
/MAX16832C  
General Description  
Features  
The MAX16832A/MAX16832C step-down constant-cur-  
rent high-brightness LED (HB LED) drivers provide a  
cost-effective design solution for automotive  
interior/exterior lighting, architectural and ambient light-  
ing, LED bulbs, and other LED illumination applications.  
o High-Efficiency Solution  
o 6.5V to 65V Input Voltage Range  
o Output Current Up to 1A  
o On-Board 65V, 0.45Ω Power MOSFET  
The MAX16832A/MAX16832C operate from a +6.5V to  
+65V input voltage range and can provide an output  
current up to 700mA, if operated up to a temperature of  
+125°C, or up to a 1A if operated up to a temperature  
of +105°C. A high-side current-sense resistor adjusts  
the output current, and a dedicated pulse-width modu-  
lation (PWM) input enables pulsed LED dimming over a  
wide range of brightness levels.  
o Hysteretic Control: Up to 2MHz Switching  
Frequency  
o ±±3 ꢀEꢁ Current Accuracy  
o 200mV Current-Sense Reference  
o Resistor-Programmable Constant ꢀEꢁ Current  
o Integrated High-Side Current Sense  
o Thermal-Foldback Protection/ꢀinear ꢁimming  
o Thermal-Shutdown Protection  
These devices are well suited for applications requiring  
a wide input voltage range. The high-side current sens-  
ing and an integrated current-setting circuitry minimize  
the number of external components while delivering an  
average output current with 3ꢀ accuracy. A hysteretic  
control method ensures excellent input supply rejection  
and fast response during load transients and PWM dim-  
ming. The MAX16832A allows 10ꢀ current ripple, and  
the MAX16832C allows 30ꢀ current ripple. Both  
devices operate up to a 2MHz switching frequency,  
thus allowing the use of small-sized components.  
o Available in a Thermally Enhanced 8-Pin SO  
Package  
o -40°C to +125°C Operating Temperature Range  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +125°C  
-40°C to +125°C  
PIN-PACKAGE  
8 SO-EP*  
MAX168±2AASA+  
MAX168±2CASA+  
The MAX16832A/MAX16832C offer an analog dimming  
feature that reduces the output current by applying an  
external DC voltage below the internal 2V threshold volt-  
age from TEMP_I to GND. TEMP_I also sources 25µA to  
a negative temperature coefficient (NTC) thermistor con-  
nected between TEMP_I and GND, thus providing an  
analog thermal-foldback feature that reduces the LED  
current when the temperature of the LED string exceeds  
a specified temperature point. Additional features  
include thermal-shutdown protection.  
8 SO-EP*  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
Typical Application Circuit  
D1  
HB LEDs  
The MAX16832A/MAX16832C operate over the -40°C to  
+125°C automotive temperature range and are available  
in a thermally enhanced 8-pin SO package.  
V
IN  
R
L1  
SENSE  
Applications  
C2  
Architectural, Industrial, and Ambient Lighting  
Automotive RCL, DRL, and Fog Lights  
Heads-Up Displays  
1
2
8
7
6
5
CS  
TEMP_I  
DIM  
ON  
*
NTC  
OFF  
IN  
Indicator and Emergency Lighting  
MR16 and MR111 LED Lights  
MAX16832A  
MAX16832C  
C1  
3
4
GND  
PGND  
LX  
LX  
Pin Configuration appears at end of data sheet.  
*
OPTIONAL  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim ꢁirect at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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