MAX16814BEUP+ Maxim Integrated Products, MAX16814BEUP+ Datasheet

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MAX16814BEUP+

Manufacturer Part Number
MAX16814BEUP+
Description
LED Drivers Integrated 4-Channel High-Brightness LED
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX16814EVKIT.pdf (25 pages)

Specifications of MAX16814BEUP+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX16814 high-efficiency, high-brightness LED (HB
LED) driver provides up to four integrated LED current-
sink channels. An integrated current-mode switching
DC-DC controller drives a DC-DC converter that pro-
vides the necessary voltage to multiple strings of HB
LEDs. The MAX16814 accepts a wide 4.75V to 40V input
voltage range and withstands direct automotive load-
dump events. The wide input range allows powering HB
LEDs for small to medium-sized LCD displays in automo-
tive and general lighting applications.
An internal current-mode switching DC-DC controller
supports the boost, coupled-inductor boost-buck, or
SEPIC topologies and operates in an adjustable fre-
quency range between 200kHz and 2MHz. It can also be
used for single-inductor boost-buck topology in conjunc-
tion with the MAX15054 and an additional MOSFET. The
current-mode control with programmable slope com-
pensation provides fast response and simplifies loop
compensation. The MAX16814 also features an adaptive
output-voltage control scheme that minimizes the power
dissipation in the LED current-sink paths.
The MAX16814 consists of four identical linear current
source channels to drive four strings of HB LEDs. The
channel current is adjustable from 20mA to 150mA with
an accuracy of ±3% using an external resistor. The
external resistor sets all 4-channel currents to the same
value. The device allows connecting multiple channels
in parallel to achieve higher current per LED string. The
MAX16814 also features pulsed dimming control, on all
four channels through a logic input (DIM). In addition,the
MAX16814A_ _ and MAX16814U_ _ include a unique
feature that allows a very short minimum pulse width as
low as 1µs.
The MAX16814 includes an output overvoltage, open-
LED detection and protection, programmable shorted
LED detection and protection, and overtemperature pro-
tection. The device operates over the -40NC to +125NC
automotive temperature range. The MAX16814 is avail-
able in 6.5mm x 4.4mm, 20-pin TSSOP and 4mm x 4mm,
20-pin TQFN packages.
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.
19-4722; Rev 5; 3/11
Automotive Displays LED Backlights
Automotive RCL, DRL, Front Position, and Fog
Lights
LCD TV and Desktop Display LED Backlights
Architectural, Industrial, and Ambient Lighting
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
_______________________________________________________________ Maxim Integrated Products 1
General Description
Applications
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V Denotes an automotive qualified part.
S 4-Channel Linear LED Current Sinks with Internal
S Boost, SEPIC, or Coupled-Inductor Boost-Buck
S Adaptive Output-Voltage Optimization to Minimize
S 4.75V to 40V Operating Input Voltage Range
S Less than 40µA Shutdown Current
S 5000:1 PWM Dimming at 200Hz (MAX16814A _ _
S Open-Drain Fault Indicator Output
S Open-LED and LED Short Detection and
S Overtemperature Protection
S Thermally Enhanced, 20-Pin TQFN and TSSOP
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
MAX16814ATP+
MAX16814ATP/V+
MAX16814AUP+
MAX16814AUP/V+
MAX16814BETP+
MAX16814BEUP+
MAX16814BUTP+
MAX16814BUUP+
MAX16814UTP+
MAX16814UUP+
MOSFETs
Current-Mode DC-DC Controller
Power Dissipation
and MAX16814U_ _ Only)
Protection
Packages
Full-Scale LED Current Adjustable from 20mA
Drives One to Four LED Strings
200kHz to 2MHz Programmable Switching
External Switching Frequency Synchronization
PART
to 150mA
Frequency
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
Ordering Information
TEMP RANGE
PIN-PACKAGE
20 TSSOP-EP*
20 TSSOP-EP*
20 TSSOP-EP*
20 TSSOP-EP*
20 TSSOP-EP*
Features
20 TQFN-EP*
20 TQFN-EP*
20 TQFN-EP*
20 TQFN-EP*
20 TQFN-EP*

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MAX16814BEUP+ Summary of contents

Page 1

... MAX16814ATP+ -40°C to +125°C MAX16814ATP/V+ -40°C to +125°C MAX16814AUP+ -40°C to +125°C MAX16814AUP/V+ -40°C to +125°C MAX16814BETP+ -40°C to +85°C MAX16814BEUP+ -40°C to +85°C MAX16814BUTP+ 0°C to +85°C MAX16814BUUP+ 0°C to +85°C MAX16814UTP+ 0°C to +85°C MAX16814UUP+ 0°C to +85°C +Denotes a lead(Pb)-free/RoHS-compliant package. ...

Page 2

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller ABSOLUTE MAXIMUM RATINGS IN to SGND ............................................................-0.3V to +45V EN to SGND ...............................................-0. PGND to SGND ....................................................-0.3V to +0.3V LEDGND to SGND ...............................................-0.3V to +0.3V OUT_ to LEDGND .................................................-0.3V ...

Page 3

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller ELECTRICAL CHARACTERISTICS (continued 12V 12.25kI SETI = OVP CS LEDGND PGND ...

Page 4

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller ELECTRICAL CHARACTERISTICS (continued 12V 12.25kI SETI = OVP CS LEDGND PGND ...

Page 5

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ( 12V 300kHz SETI 0V, load = 4 strings of 7 white ...

Page 6

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ( 12V 300kHz SETI 0V, load =4 strings of 7 white LEDs, ...

Page 7

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller ( 12V 300kHz SETI 0V, load = 4 strings of 7 white LEDs, T ...

Page 8

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller PIN NAME TQFN TSSOP Bias Supply Input. Connect a 4.75V to 40V supply to IN. Bypass IN to SGND with a ceramic capacitor. Enable Input. Connect EN to ...

Page 9

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller PIN NAME TQFN TSSOP LED String Cathode Connection 2. OUT2 is the open-drain output of the linear current sink that 12 15 OUT2 controls the current through the LED string connected ...

Page 10

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller FLT MAX16814 SHDN DRV PWM NDRV LOGIC PGND CLK SLOPE RT COMPENSATION RAMP/RT OSC 50FA BLANKING COMP THERMAL TSHDN ...

Page 11

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller VDRV C4 DIM COMP R COMP C COMP Figure 2. Circuit Used for Typical Operating Characteristics ______________________________________________________________________________________ ...

Page 12

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller Detailed Description The MAX16814 high-efficiency HB LED driver inte- grates all the necessary features to implement a high- performance backlight driver to power LEDs in small to medium-sized displays for automotive ...

Page 13

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller The converter stops switching when the LED strings are turned off during PWM dimming. The error amplifier is disconnected from the COMP output to retain the com- pensation capacitor charge. This ...

Page 14

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller where Ω. T The pulse width for the synchronization pulse should satisfy the following relations < CLK   0.8 ...

Page 15

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller flag output (FLT) goes low when an open-LED string is detected, a shorted LED string is detected, and during thermal shutdown. FLT is cleared when the fault condi- tion is removed ...

Page 16

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller Power-Circuit Design First select a converter topology based on the above factors. Determine the required input supply voltage range, the maximum voltage needed to drive the LED strings including the minimum ...

Page 17

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller The factor 1.1 provides a 10% margin to account for the converter losses: IL2 I = AVG LED Assuming the peak-to-peak inductor ripple DIL is Q30% of the average inductor current: ...

Page 18

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller Use the following equation to calculate the value of slope compensation resistance, R SCOMP For boost configuration: ( − LED IN_MIN R = SCOMP × ...

Page 19

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller Feedback Compensation During normal operation, the feedback control loop reg- ulates the minimum OUT_ voltage to 1V when LED string currents are enabled during PWM dimming. When LED currents are off ...

Page 20

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller Analog Dimming Using External Connect a resistor R to the SETI input as shown in SETI2 Figure 7 for controlling the LED string current using an external control voltage. The MAX16814 ...

Page 21

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller PCB Layout Considerations LED driver circuits based on the MAX16814 device use a high-frequency switching converter to generate the voltage for LED strings. Take proper care while laying out the circuit ...

Page 22

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller V IN 4.75V TO 40V DIM COMP R COMP C COMP Figure 6. Coupled-Inductor Boost-Buck Configuration MAX16814 SETI 1.23V R SETI Figure 7. Analog Dimming ...

Page 23

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller TOP VIEW + NDRV 1 20 PGND DRV OUT4 CC MAX16814 IN 4 OUT3 LEDGND COMP 6 15 OUT2 RT 7 ...

Page 24

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller Chip Information PROCESS: BiCMOS DMOS 24 _____________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package ...

Page 25

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2011 Maxim Integrated Products © ...

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