MAX16826ATJ+ Maxim Integrated Products, MAX16826ATJ+ Datasheet

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MAX16826ATJ+

Manufacturer Part Number
MAX16826ATJ+
Description
LED Drivers Programmable Four-St ring HB LED Driver w
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX16826BATJVT.pdf (26 pages)

Specifications of MAX16826ATJ+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX16826 high-brightness LED (HB LED) driver is
designed for backlighting automotive LCD displays and
other display applications such as industrial or desktop
monitors and LCD televisions. The MAX16826 integrates
a switching regulator controller, a 4-channel linear cur-
rent sink driver, an analog-to-digital converter (ADC),
and an I
automotive load dump transients up to 40V and can
operate under cold crank conditions.
The MAX16826 contains a current-mode PWM switching
regulator controller that regulates the output voltage to
the LED array. The switching regulator section is config-
urable as a boost or SEPIC converter and its switching
frequency is programmable from 100kHz to 1MHz.
The MAX16826 includes 4 channels of programmable,
fault-protected, constant-current sink driver controllers
that are able to drive all white, RGB, or RGB plus amber
LED configurations. LED dimming control for each chan-
nel is implemented by direct PWM signals for each of the
four linear current sinks. An internal ADC measures the
drain voltage of the external driver transistors and the
output of the switching regulator. These measurements
are then made available through the I
external microcontroller (µC) to enable output voltage
optimization and fault monitoring of the LEDs.
The amplitude of the LED current in each linear current-
sink channel and the switch-mode regulator output volt-
age is programmed using the I
features include: cycle-by-cycle current limit, shorted
LED string protection, and overtemperature protection.
The MAX16826 is available in a thermally enhanced,
5mm x 5mm, 32-pin thin QFN package and is specified
over the automotive -40°C to +125°C temperature range.
19-4047; Rev 3; 6 /10
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.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
Output-Voltage Optimization and Fault Detection
LCD Backlighting:
Automotive Lighting:
Programmable, Four-String HB LED Driver with
Automotive Infotainment Displays
Automotive Cluster Displays
Industrial and Desktop Monitors
LCD TVs
Adaptive Front Lighting
Low- and High-Beam Assemblies
2
C interface. The IC is designed to withstand
________________________________________________________________ Maxim Integrated Products
General Description
2
C interface. Additional
Applications
2
C interface to an
o External MOSFETs Allow Wide-Range LED
o Individual PWM Dimming Inputs per String
o Very Wide Dimming Range
o LED String Short and Open Protection
o Adjustable LED Current Rise/Fall Times Improve
o Microcontroller Interface Using I
o Integrated Boost/SEPIC Controller
o External Switching Frequency Synchronization
o 4.75V to 24V Operating Voltage Range and
o Overvoltage and Overtemperature Protection
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
/V denotes an automotive qualified part.
Ordering Information continued at end of data sheet.
MAX16826ATJ+
MAX16826ATJ/V+
V
IN
Current with Multiple LEDs per String
EMI Control
Withstands 40V Load Dump
BOOST LED DRIVER
LED Voltage Monitoring and Optimization
Using a 7-Bit Internal ADC
LED Short and Open Detection
Dynamic Adjustment of LED String Currents
and Output Voltage
Standby Mode
DIM1
DIM2
DIM3
DIM4
SDA
SCL
PART
IN
I
INTERFACE
2
C
DIMMING
INPUTS
DL
MAX16826
CS
Ordering Information
- 40°C to + 125°C
- 40°C to + 125°C
TEMP RANGE
GND
Simplified Diagram
FB
DR4
DR1
CS1
CS4
DL1
DL4
2
C Allows
PIN-PACKAGE
32 TQFN-EP*
32 TQFN-EP*
Features
1

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MAX16826ATJ+ Summary of contents

Page 1

... Integrated Boost/SEPIC Controller o External Switching Frequency Synchronization o 4.75V to 24V Operating Voltage Range and Withstands 40V Load Dump o Overvoltage and Overtemperature Protection PART 2 C interface to an MAX16826ATJ+ MAX16826ATJ/V+ + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. /V denotes an automotive qualified part. Ordering Information continued at end of data sheet ...

Page 2

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection ABSOLUTE MAXIMUM RATINGS IN to GND (Continuous) .........................................-0.3V to +30V IN Peak Current (≤ 400ms) ...............................................300mA IN Continuous Current ........................................................50mA PGND to GND .......................................................-0.3V to +0.3V All Other Pins ...

Page 3

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection ELECTRICAL CHARACTERISTICS (continued 12V, R19 = 2kΩ, C33 = 2200pF, R17 = 1.27kΩ are +25°C.) (Note 1) A PARAMETER Maximum Receive SCL/SDA ...

Page 4

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection ELECTRICAL CHARACTERISTICS (continued 12V, R19 = 2kΩ, C33 = 2200pF, R17 = 1.27kΩ are +25°C.) (Note 1) A PARAMETER ERROR AMPLIFIER (FB, ...

Page 5

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection ELECTRICAL CHARACTERISTICS (continued 12V, R19 = 2kΩ, C33 = 2200pF, R17 = 1.27kΩ are +25°C.) (Note 1) A PARAMETER ADC (DR1–DR4, OVP) ...

Page 6

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection (V = 12V, R19 = 2kΩ, C33 = 2200pF, R17 = 1.27kΩ SUPPLY CURRENT vs. SUPPLY VOLTAGE ...

Page 7

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection (V = 12V, R19 = 2kΩ, C33 = 2200pF, R17 = 1.27kΩ ENABLE AND DISABLE RESPONSE MAX16826 toc09 V SYNC/EN I LED 40ms/div V VOLTAGE CC vs. ...

Page 8

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection PIN NAME 1 PGND Power Ground 2, 3 GND Analog Ground Timing Resistor and Capacitor Connection. A resistor, R19 (in the Typical Application Circuit), from V 4 RTCT RTCT ...

Page 9

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection PIN NAME near ent S our ce O utp ut ves the g ...

Page 10

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection IN 29 26V SHUNT V CC GND OVP PGND CURRENT- MODE RSC 10 PWM BLOCK CSS 6 ...

Page 11

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection The MAX16826 provides additional flexibility with an 2 internal I C serial interface to communicate with a microcontroller (µC). The interface can be used to dynamically adjust the amplitude ...

Page 12

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection The MAX16826 has an internal 26V (typ) shunt regula- tor to provide the primary protection against an auto- motive load dump. When the input voltage is below 26V, the ...

Page 13

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection 6µA CSS BUS SWR DAC 1.25V SET - OVP R Q OVP COMPARATOR CLR SHDN STBY SYNC OSCILLATOR RTCT CS ...

Page 14

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection The MAX16826 oscillator frequency is programmable using an external capacitor (C33 in the Typical Application Circuit ) and a resistor (R19) at RTCT. R19 is connected from RTCT to ...

Page 15

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection rising edge of the clock. When using external synchro- nization, the clock frequency set by RTCT must be 10% lower than the synchronization signal frequency. Overvoltage Protection (OVP) OVP ...

Page 16

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection is 2µs, so the ADC requires at least 5 of these minimum pulses within the 190ms measurement window to com- plete a conversion. During PWM dimming, LED current pulse ...

Page 17

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection Overview of the Digital Section Figure 3 shows the block diagram of the digital section in 2 the MAX16826. The I C serial interface provides flexible control of the ...

Page 18

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection open-drain bus. Both SDA and SCL are bidi- rectional lines, connected to a positive supply voltage using a pullup resistor. They both have Schmitt ...

Page 19

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection Accessing the MAX16826 The communication between the µC and the MAX16826 is based on the usage of a set of protocols defined on 2 top of the standard I ...

Page 20

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection The register file unit is used to store all the control infor- mation from the SDA line and configure the MAX16826 for different operating conditions. The register file assignments ...

Page 21

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection register. First, activate standby mode and then deacti- 2 vate this mode using the I C interface. Next, perform a read operation on the fault status register. The old ...

Page 22

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection The SEPIC power topology is very useful when the input voltage is expected to be higher or lower than the output voltage of the switching regulator stage as required ...

Page 23

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection PCB Layout and Routing Careful PCB layout is important for proper operation. Use the following guidelines for good PCB layout: • Minimize the area of the high current-switching loop ...

Page 24

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection 24 ______________________________________________________________________________________ Typical Application Circuit INTERFACE SYSTEM ...

Page 25

Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection Pin Configuration TOP VIEW DR3 25 CS4 26 DL4 27 28 DR4 MAX16826 ...

Page 26

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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