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MAX16834ATPV+

更新时间： 2024-11-23 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
23页 199K
描述
High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver

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19-4235; Rev 3; 1/10  
High-Power LED Driver with Integrated High-Side LED  
Current Sense and PWM Dimming MOSFET Driver  
MAX16834  
General Description  
Features  
o Wide Input Operating Voltage Range (4.75V to  
The MAX16834 is a current-mode high-brightness LED  
(HB LED) driver for boost, boost-buck, SEPIC, and high-  
side buck topologies. In addition to driving an n-channel  
power MOSFET switch controlled by the switching con-  
troller, it also drives an n-channel PWM dimming switch to  
achieve LED PWM dimming. The MAX16834 integrates  
all the building blocks necessary to implement a fixed-fre-  
quency HB LED driver with wide-range dimming control.  
The MAX16834 features constant-frequency peak cur-  
rent-mode control with programmable slope compensa-  
tion to control the duty cycle of the PWM controller.  
28V)  
o Works for Input Voltage > 28V with External  
Voltage Clamp on V for Boost Converter  
IN  
o 3000:1 PWM Dimming/Analog Dimming  
o Integrated PWM Dimming MOSFET Driver  
o Integrated High-Side Current-Sense Amplifier for  
LED Current Sense in Boost-Buck Converter  
o 100kHz to 1MHz Programmable High-Frequency  
Operation  
o External Clock Synchronization Input  
o Programmable UVLO  
A dimming driver designed to drive an external n-chan-  
nel MOSFET in series with the LED string provides  
wide-range dimming control up to 20kHz. In addition to  
PWM dimming, the MAX16834 provides analog dim-  
ming using a DC input at REFI. The programmable  
switching frequency (100kHz to 1MHz) allows design  
optimization for efficiency and board space reduction.  
A single resistor from RT/SYNC to ground sets the  
switching frequency from 100kHz to 1MHz while an  
external clock signal at RT/SYNC disables the internal  
oscillator and allows the MAX16834 to synchronize to  
an external clock. The MAX16834’s integrated high-  
side current-sense amplifier eliminates the need for a  
separate high-side LED current-sense amplifier in  
boost-buck applications.  
o Internal 7V Low-Dropout Regulator  
o Fault Output (FLT) for Overvoltage, Overcurrent,  
and Thermal Warning Faults  
o Programmable True Differential Overvoltage  
Protection  
o 20-Pin TQFN-EP and TSSOP-EP Packages  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
PIN-PACKAGE  
20 TQFN-EP*  
20 TQFN-EP*  
20 TSSOP-EP*  
20 TSSOP-EP*  
MAX16834ATP+  
MAX16834ATP/V+  
MAX16834AUP+  
MAX16834AUP/V+  
The MAX16834 operates over a wide supply range of  
4.75V to 28V and includes a 3A sink/source gate driver  
for driving a power MOSFET in high-power LED driver  
applications. It can also operate at input voltages  
greater than 28V in boost configuration with an external  
voltage clamp. The MAX16834 is also suitable for DC-  
DC converter applications such as boost or boost-  
buck. Additional features include external enable/  
disable input, an on-chip oscillator, fault indicator out-  
put (FLT) for LED open/short or overtemperature condi-  
tions, and an overvoltage protection sense input  
(OVP+) for true overvoltage protection.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
/V denotes an automotive qualified part.  
Simplified Application Circuit  
V
IN  
BOOST LED DRIVER  
LED+  
IN  
NDRV  
The MAX16834 is available in a thermally enhanced  
4mm x 4mm, 20-pin TQFN-EP package and in a thermal-  
ly enhanced 20-pin TSSOP-EP package and is specified  
over the automotive -40°C to +125°C temperature range.  
LEDs  
LED-  
MAX16834  
ON  
OFF  
PWMDIM  
REFI  
CS  
ANALOG  
DIM  
DIMOUT  
Applications  
Single-String LED LCD Backlighting  
Automotive Rear and Front Lighting  
PGND  
SENSE+  
Projection System RGB LED Light Sources  
Architectural and Decorative Lighting (MR16, M111)  
Spot and Ambient Lights  
DC-DC Boost/Boost-Buck Converters  
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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