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PDF MAX16814 Data sheet ( Hoja de datos )
| Número de pieza | MAX16814 | |
| Descripción | High-Brightness LED Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX16814 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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MAX16814
EVALUATION KIT AVAILABLE
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 provides
the necessary voltage to multiple strings of HB LEDs.
The MAX16814 accepts a wide 4.75V to 40V input volt-
age range and withstands direct automotive load-dump
events. The wide input range allows powering HB LEDs
for small to medium-sized LCD displays in automotive
and general lighting applications.
An internal current-mode switching DC-DC control-
ler supports the boost, coupled-inductor boost-buck,
or SEPIC topologies and operates in an adjustable
frequency range between 200kHz and 2MHz. It can
also be used for single-inductor boost-buck topology in
conjunction with the MAX15054 and an additional
MOSFET. The current-mode control with programma-
ble slope compensation provides fast response and
simplifies loop compensation. The MAX16814 also fea-
tures 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 output overvoltage, open-
LED detection and protection, programmable shorted-
LED detection and protection, and overtemperature
protection. The device operates over the -40NC to
+125NC automotive temperature range. The MAX16814 is
available in 6.5mm x 4.4mm, 20-pin TSSOP, 4mm x 4mm,
20-pin TQFN and QFND 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
Benefits and Features
●● Cost-Effective 4-Channel Linear LED Current Sinks
for Wide Range of LED Lighting Applications
• Drives One to Four LED Strings
• 4.75V to 40V Input Voltage Range
• Full-Scale LED Current Adjustable from 20mA
to 150mA
• 5000:1 PWM Dimming at 200Hz
• Less than 40µA Shutdown Current
●● Minimal Component Count Saves Cost and Space
• Internal MOSFET for Each Channel
• Internal Current-Mode Switching DC-DC Controller
Supporting Boost, Coupled-Inductor Boost-Buck, or
SEPIC Topologies
• 200kHz to 2MHz Programmable Switching
Frequency for Optimizing Size vs. Efficiency
• External Switching-Frequency Synchronization
●● Protection Features and Wide Operating
Temperature Range improves Reliability
• Open-Drain Fault-Indicator Output
• Open-LED and LED-Short Detection and Protection
• Overtemperature Protection
• Available in Thermally Enhanced 20-Pin TQFN,
QFND, and TSSOP Packages
• Operation Over -40°C to +125°C Temperature Range
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*
MAX16814AGP/VY+ -40°C to +125°C 20 QFND-EP* (SW)
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; (SW) = side wettable.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
19-4722; Rev 10; 2/15
1 page  
MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
Typical Operating Characteristics
(VIN = VEN = 12V, fSW = 300kHz, RSETI = 15kI, CVCC = 1FF, VCC = VDRV, NDRV = COMP = OUT_ = unconnected, VOVP = VCS =
VLEDGND = VDIM = VPGND = VSGND = 0V, load = 4 strings of 7 white LEDs, TA = +25NC, unless otherwise noted.)
SWITCHING WAVEFORM AT 5kHz
(50% DUTY CYCLE) DIMMING
MAX16814 toc01
40Fs/div
VLX
10V/div
0V
IOUT1
100mA/div
0A
VOUT
10V/div
FIGURE 2 0V
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3.8
CNDRV = 13pF
3.6
TA = +125NC
3.4
3.2 TA = +25NC
3.0
TA = -40NC
2.8
2.6
2.4
5
10 15 20 25 30 35 40 45
VIN (V)
SUPPLY CURRENT
vs. SWITCHING FREQUENCY
4.4
CNDRV = 13pF
4.2
4.0
SWITCHING FREQUENCY
vs. TEMPERATURE
310
308
306
304
VSETI vs. TEMPERATURE
1.240
1.236
3.8 302 1.232
300
3.6 298 1.228
3.4 296
294 1.224
3.2 292
3.0
200 400 600 800 1000 1200 1400 1600 1800 2000
fSW (kHz)
290
-50 -25
0 25 50 75 100 125
TEMPERATURE (NC)
1.220
-50 -25
0 25 50 75 100
TEMPERATURE (NC)
125
VSETI vs. PROGRAMMED CURRENT
1.234
1.233
1.232
1.231
1.230
1.229
EN THRESHOLD VOLTAGE
vs. TEMPERATURE
1.30
1.25 VEN RISING
1.20
VEN FALLING
1.15
EN LEAKAGE CURRENT
vs. TEMPERATURE
150
VEN = 2.5V
120
90
60
30
1.228
20
46 72 98 124
LED STRING CURRENT (mA)
150
1.10
-50 -25
0 25 50 75 100 125
TEMPERATURE (NC)
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (NC)
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
VIN
C6
L2
C5
C1
L1 D1
M1
C2
R1
C7
R2
D2
R7
RSCOMP
RCS
C8
7 HBLEDS
PER STRING
C3
R5
C4
RCOMP
CCOMP
IN
EN
NDRV
VCC
CS
MAX16814
VDRV
DIM
COMP
OVP
OUT1
OUT2
OUT3
OUT4
SETI
FLT
RSDT
RT
RSETI
R6
R3
R4
RT
VCC
SGND
PGND
LEDGND
Figure 2. Circuit Used for Typical Operating Characteristics
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX16814.PDF ] | |
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