MAX16814_11 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller

19-4722; Rev 5; 3/11
EVAALVUAAILTAIOBNLEKIT
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
General Description
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.
Applications
Automotive Displays LED Backlights
Automotive RCL, DRL, Front Position, and Fog
Lights
LCD TV and Desktop Display LED Backlights
Architectural, Industrial, and Ambient Lighting
Features
S 4-Channel Linear LED Current Sinks with Internal
MOSFETs
Full-Scale LED Current Adjustable from 20mA
to 150mA
Drives One to Four LED Strings
S Boost, SEPIC, or Coupled-Inductor Boost-Buck
Current-Mode DC-DC Controller
200kHz to 2MHz Programmable Switching
Frequency
External Switching Frequency Synchronization
S Adaptive Output-Voltage Optimization to Minimize
Power Dissipation
S 4.75V to 40V Operating Input Voltage Range
S Less than 40µA Shutdown Current
S 5000:1 PWM Dimming at 200Hz (MAX16814A _ _
and MAX16814U_ _ Only)
S Open-Drain Fault Indicator Output
S Open-LED and LED Short Detection and
Protection
S Overtemperature Protection
S Thermally Enhanced, 20-Pin TQFN and TSSOP
Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX16814ATP+ -40°C to +125°C
20 TQFN-EP*
MAX16814ATP/V+ -40°C to +125°C
20 TQFN-EP*
MAX16814AUP+ -40°C to +125°C
20 TSSOP-EP*
MAX16814AUP/V+ -40°C to +125°C
20 TSSOP-EP*
MAX16814BETP+ -40°C to +85°C
20 TQFN-EP*
MAX16814BEUP+ -40°C to +85°C
20 TSSOP-EP*
MAX16814BUTP+ 0°C to +85°C
20 TQFN-EP*
MAX16814BUUP+ 0°C to +85°C
20 TSSOP-EP*
MAX16814UTP+
0°C to +85°C
20 TQFN-EP*
MAX16814UUP+
0°C to +85°C
20 TSSOP-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V Denotes an automotive qualified part.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
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