MAX16834ATP+ by Analog Devices

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver


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 controller, 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-frequency HB LED driver with wide-range dimming control. The MAX16834 features constant-frequency peak current-mode control with programmable slope compensation to control the duty cycle of the PWM controller. A dimming driver designed to drive an external n-channel MOSFET in series with the LED string provides wide-range dimming control up to 20kHz. In addition to PWM dimming, the MAX16834 provides analog dimming 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. 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 buck-boost. Additional features include external enable/disable input, an on-chip oscillator, fault indicator output (active-low FLT) for LED open/short or overtemperature conditions, and an overvoltage protection sense input (OVP+) for true overvoltage protection. The MAX16834 is available in a thermally enhanced 4mm x 4mm, 20-pin TQFN-EP package and in a thermally enhanced 20-pin TSSOP-EP package and is specified over the automotive -40°C to +125°C temperature range.

Where to Buy

Prices starting from US$1.88

Distributor Stock
Logo for Farnell
Farnell
from US$1.88
No stock
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Logo for element14
element14
from US$4.87
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Logo for Newark Electronics
Newark Electronics
-
-
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Features

Integration Minimizes BOM for High-Brightness LED Driver with a Wide Dimming Range Saving Space and Cost Constant-Frequency, Peak Current-Mode Control with Programmable Slope Compensation Integrated PWM Dimming MOSFET Driver 3000:1 PWM Dimming/Analog Dimming Integrated High-Side Current-Sense Amplifier for LED Current Sense in Boost-Buck Converter Internal 7V Low-Dropout Regulator
Constant-Frequency, Peak Current-Mode Control with Programmable Slope Compensation
Integrated PWM Dimming MOSFET Driver
3000:1 PWM Dimming/Analog Dimming
Integrated High-Side Current-Sense Amplifier for LED Current Sense in Boost-Buck Converter
Internal 7V Low-Dropout Regulator
Simple Optimization for Efficiency, Board Space and Input Operating Range Supports Boost, Buck-Boost, SEPIC, and High-Side Buck Topologies 100kHz to 1MHz Programmable High-Frequency Operation External Clock Synchronization Input Wide Input Operating Voltage Range (4.75V to 28V) Works for Input Voltage > 28V with External Voltage Clamp on VIN for Boost Converter 20-Pin TQFN-EP and TSSOP-EP Packages
Supports Boost, Buck-Boost, SEPIC, and High-Side Buck Topologies
100kHz to 1MHz Programmable High-Frequency Operation
External Clock Synchronization Input
Wide Input Operating Voltage Range (4.75V to 28V)
Works for Input Voltage > 28V with External Voltage Clamp on VIN for Boost Converter
20-Pin TQFN-EP and TSSOP-EP Packages
Protection Features Increase System Reliability Programmable UVLO Programmable True Differential Overvoltage Protection Fault Output (FLT) for Overvoltage, Overcurrent, and Thermal-Warning Faults
Programmable UVLO
Programmable True Differential Overvoltage Protection
Fault Output (FLT) for Overvoltage, Overcurrent, and Thermal-Warning Faults

Specifications

VIN (V) (min) 4.75
VIN (V) (max) 28
Max. No. of LEDs 40
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 10
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 3000
Dimming Control AnalogPWM
POUT (W) 100
ICC (mA) (max) 6
LED String Volt. (V) (max) 250
Switching Frequency (kHz) 1000
Package/Pins QFND/20TQFN/20TSSOP/20
BudgetaryPrice (See Notes) 2.34


MAX16834ATP+ Semiconductors - ICs by Analog Devices

LED DRIVER BOOST/BUCK 1MHZ TQFN-20

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Device Topology Boost Buck Buck-Boost SEPIC
Input Voltage Min 4.75V
Input Voltage Max 28V
Output Voltage Max 250V
Output Current Max 10A
Switching Frequency 1MHz
No. of Outputs 1Outputs
IC Mounting SMD
Driver Case Style TQFN
No. of Pins 20Pins
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Output Current 3A

Alternative Descriptions

IC, LED DRIVER, HIGH POWER, 20QFN | Farnell
Led Driver, Boost/Buck, 1Mhz, Tqfn-20 | Newark Electronics

Frequently Asked Questions

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Is the MAX16834ATP+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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