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MAX16838_11

更新时间： 2024-09-26 11:18:23
品牌 Logo 应用领域
美信 - MAXIM 驱动器高压控制器
页数 文件大小 规格书
21页 1546K
描述
Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller

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19-4972; Rev 2; 4/11  
Integrated, 2-Channel, High-Brightness LED Driver  
with High-Voltage Boost and SEPIC Controller  
General Description  
Features  
S Integrated, 2-Channel, 20mA to 150mA Linear LED  
The MAX16838 is a dual-channel LED driver that inte-  
grates both the DC-DC switching boost regulator and  
two 150mA current sinks. A current-mode switching  
DC-DC controller provides the necessary voltage to  
both strings of HB LEDs. The MAX16838 accepts a wide  
4.75V to 40V input voltage range and directly withstands  
automotive load-dump events. For a 5V Q10% input volt-  
Current Sinks  
S Boost or SEPIC Power Topologies for Maximum  
Flexibility  
S Adaptive Voltage Optimization to Minimize Power  
Dissipation in Linear Current Sinks  
S 4.75V to 40V or 5V 10% Input Operating Voltage  
Range  
age, connect V to V . The wide input range allows  
IN  
CC  
S 5000:1 PWM Dimming at 200Hz  
powering HB LEDs for small-to-medium-sized LCD dis-  
plays in automotive and display backlight applications.  
S Open-Drain Fault Indicator Output  
S LED Open/Short Detection and Protection  
An internal current-mode switching DC-DC controller  
supports the boost or SEPIC topologies and operates  
in an adjustable frequency range between 200kHz and  
2MHz. The current-mode control provides fast response  
and simplifies loop compensation. The MAX16838 also  
features an adaptive output-voltage adjustment scheme  
that minimizes the power dissipation in the LED current  
sink paths. The MAX16838 can be combined with the  
MAX15054 to achieve a buck-boost LED driver with two  
integrated current sinks.  
S Output Overvoltage and Overtemperature  
Protection  
S Programmable LED Current Foldback at Lower  
Input Voltages  
S 200kHz to 2MHz Resistor Programmable  
Switching Frequency with External  
Synchronization  
S Current-Mode Control Switching Stage with  
Internal Slope Compensation  
S Enable Input  
S Thermally Enhanced, 20-Pin TQFN (4mm x 4mm)  
The channel current is adjustable from 20mA to 150mA  
using an external resistor. The external resistor sets both  
channel currents to the same value. The device allows  
connecting both strings in parallel to achieve a maximum  
current of 300mA in a single channel. The MAX16838  
also features pulsed dimming control with minimum  
pulse widths as low as 1Fs, on both channels through a  
logic input (DIM).  
and 20-Pin TSSOP Packages  
Ordering Information  
PART  
TEMP RANGE  
-40NC to +125NC  
-40NC to +125NC  
-40NC to +125NC  
PIN-PACKAGE  
20 TQFN-EP*  
20 TQFN-EP*  
20 TSSOP-EP*  
20 TSSOP-EP*  
MAX16838ATP+  
MAX16838ATP/V+  
MAX16838AUP+  
MAX16838AUP/V+ -40NC to +125NC  
The MAX16838 includes an output overvoltage protec-  
tion, open LED, shorted LED detection and overtempera-  
ture protection. The device operates over the -40NC to  
+125NC automotive temperature range. The MAX16838  
is available in the 20-pin TSSOP and 4mm x 4mm, 20-pin  
TQFN packages.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
/V denotes an automotive qualified part.  
Simplified Schematic  
4.75V TO 40V  
L
D
Applications  
Automotive Display Backlights  
C
C
OUT  
IN  
R2  
OV  
OV  
LED  
STRINGS  
LCD Display Backlights  
IN  
DRAIN OV  
NDRV  
R1  
EN  
Automotive Lighting Applications  
CFB  
GATE  
V
CC  
OUT1  
MAX16838  
OUT2  
ISET  
DRV  
R
ISET  
FLT  
CS  
RT  
DIM  
COMP  
C
COMP  
R
COMP  
SGND  
PGND LEDGND  
R
RT  
R
CS  
Typical Operating Circuit and Pin Configurations appear at  
end of data sheet.  
_______________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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