|
|
PDF MAX16807 Data sheet ( Hoja de datos )
| Número de pieza | MAX16807 | |
| Descripción | (MAX16807 / MAX16808) Integrated 8-Channel LED Drivers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX16807 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
19-0655; Rev 0; 10/06
Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
General Description
The MAX16807/MAX16808 are integrated, high-efficien-
cy white or RGB LED drivers. They are designed for
LCD backlighting and other LED lighting applications
with multiple strings of LEDs. The MAX16807/
MAX16808’s current-mode PWM controller regulates
the necessary voltage to the LED array. Depending on
the input voltage and LED voltage range, it can be
used with boost or buck-boost (SEPIC) topologies. The
MAX16807/MAX16808 feature an 8V to 26.5V input volt-
age range. A wide range of adjustable frequency
(20kHz to 1MHz) allows design optimization for efficien-
cy and minimum board space.
The MAX16807/MAX16808 LED drivers include eight
open-drain, constant-current-sinking LED driver outputs
rated for 36V continuous operation. The LED current-
control circuitry achieves ±3% current matching among
strings and enables paralleling of outputs for LED string
currents higher than 55mA. The output-enable pin is
used for simultaneous PWM dimming of all output chan-
nels. Dimming frequency range is 50Hz to 30kHz and
dimming ratio is up to 5000:1. The constant-current out-
puts are single resistor programmable and the LED cur-
rent can be adjusted up to 55mA per output channel.
The MAX16807/MAX16808 operate either in stand-alone
mode or with a microcontroller (µC) using an industry-
standard, 4-wire serial interface. The MAX16808 includes
circuitry that automatically detects open-circuit LEDs.
The MAX16807/MAX16808 include overtemperature
protection, operate over the full -40°C to +125°C tem-
perature range, and are available in a thermally
enhanced, 28-pin TSSOP exposed paddle package.
Pin Configurations appear at end of data sheet.
Features
♦ Eight Constant-Current Output Channels (Up to
55mA Each)
♦ ±3% Current Matching Among Outputs
♦ Paralleling Channels Allows Higher Current per
LED String
♦ Outputs Rated for 36V Continuous Voltage
♦ Output-Enable Pin for PWM Dimming (Up to 30kHz)
♦ One Resistor Sets LED Current for All Channels
♦ Wide Dimming Ratio Up to 5000:1
♦ Low Current-Sense Reference (300mV) for High
Efficiency
♦ 8V to 26.5V Input Voltage or Higher with External
Biasing Devices
♦ Open LED Detection (MAX16808)
♦ 4-Wire Serial Interface to Control Individual
Output Channels
Applications
LCD White or RGB LED Backlighting:
LCD TVs, Desktop, and Notebook Panels
Automotive Navigation, Heads-Up,
and Infotainment Displays
Industrial and Medical Displays
Ambient, Mood, and Accent Lighting
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
MAX16807AUI+ -40°C to +125°C 28 TSSOP-EP** U28ME-1
MAX16808AUI+* -40°C to +125°C 28 TSSOP-EP** U28ME-1
+Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed paddle.
Typical Operating Circuits
VIN
3V TO 5.5V
CIN
CBYP
RSET
LD
Q COUT
CC2
RCS
CC1 RC1
OUT CS AGND
VCC
COMP
FB
V+
PGND
LE
DIN
CLK
DOUT
OE
SET
REF
MAX16807
MAX16808
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
RTCT
RT
CREF CT
VOUT
R1
R2
LEDs
STAND-ALONE OPERATION
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
5V TIMING CHARACTERISTICS
(V+ = +4.5V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40°C
to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 5)
PARAMETER
SYMBOL
INTERFACE TIMING CHARACTERISTICS
CLK Clock Period
tCP
CLK Pulse-Width High
tCH
CLK Pulse-Width Low
DIN Setup Time
DIN Hold Time
tCL
tDS
tDH
DOUT Propagation Delay
DOUT Rise Time
tDO
tDR
DOUT Fall Time
tDF
LE Pulse-Width High
tLW
LE Setup Time
LE Rising to OUT_ Rising Delay
tLS
tLRR
LE Rising to OUT_ Falling Delay
CLK Rising to OUT_ Rising Delay
tLRF
tCRR
CLK Rising to OUT_ Falling
Delay
tCRF
OE Rising to OUT_ Rising Delay
OE Falling to OUT_ Falling Delay
OUT_ Turn-On Fall Time
tOER
tOEF
tF
OUT_ Turn-Off Rise Time
tR
CONDITION
CDOUT = 10pF, 20% to 80%
CDOUT = 10pF, 80% to 20%
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
80% to 20% (Note 6)
20% to 80% (Note 6)
MIN TYP MAX UNITS
40 ns
19 ns
19 ns
4 ns
8 ns
12 50 ns
10 ns
10 ns
20 ns
15 ns
110 ns
325 ns
110 ns
325 ns
110 ns
325 ns
210 ns
130 ns
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
PIN
1, 13, 28
2
3
4
5
6–9
10
11
12
14
15, 16
17
18
19
20–23
24
25
26
27
—
Pin Description
NAME
N.C.
AGND
OUT
FUNCTION
No Connection. Not internally connected. Leave unconnected.
Analog Ground
MOSFET Driver Output OUT. Connects to the gate of the external n-channel MOSFET.
VCC
Power-Supply Input. Bypass VCC to AGND with a 0.1µF ceramic capacitor or a parallel combination
of a 0.1µF and a higher value ceramic capacitor.
REF 5V Reference Output. Bypass REF to AGND with a 0.1µF ceramic capacitor.
OUT4–OUT7 LED Driver Outputs. OUT4–OUT7 are open-drain, constant-current-sinking outputs rated for 36V.
OE Active-Low Output Enable Input. Drive OE low to PGND to enable the OUT0–OUT7. Drive OE high to
disable OUT0–OUT7.
DOUT
Serial-Data Output. Data is clocked out of the 8-bit internal shift register to DOUT on CLK’s rising
edge.
SET LED Current Setting. Connect RSET from SET to PGND to set the LED current.
V+ LED Driver Positive Supply Voltage. Bypass V+ to PGND with a 0.1µF ceramic capacitor.
PGND Power Ground
DIN Serial-Data Input
CLK Serial-Clock Input
Latch-Enable Input. Data is loaded transparently from the internal shift register(s) to the output
LE latch(es) while LE is high. Data is latched into the output latch(es) on LE’s falling edge, and retained
while LE is low.
OUT0–OUT3
COMP
FB
CS
LED Driver Outputs. OUT0–OUT3 are open-drain, constant-current-sinking outputs rated for 36V.
Error-Amplifier Output
Error-Amplifier Inverting Input
PWM Controller Current-Sense Input
RTCT
PWM Controller Timing Resistor/Capacitor Connection. A resistor RT from RTCT to REF and a
capacitor CT from RTCT to AGND set the oscillator frequency.
EP
Exposed Paddle. Connect to the ground plane for improved power dissipation. Do not use as the
only ground connection for the part.
Detailed Description
The MAX16807/MAX16808 LED drivers include an
internal switch-mode controller that can be used as
boost or buck-boost (SEPIC) converters to generate the
voltage necessary to drive the multiple strings of LEDs.
These devices incorporate an integrated low-side dri-
ver, a programmable oscillator (20kHz to 1MHz), an
error amplifier, a low-voltage (300mV) current sense for
higher efficiency, and a 5V reference to power up
external circuitry (see Figures 1a, 1b, and 1c).
The MAX16807/MAX16808 LED drivers include a 4-wire
serial interface and a current-mode PWM controller to
generate the necessary voltage for driving eight open-
drain, constant-current-sinking output ports. The drivers
use current-sensing feedback circuitry (not simple cur-
rent mirrors) to ensure very small current variations over
the full allowed range of output voltage (see the Typical
Operating Characteristics). The 4-wire serial interface
comprises an 8-bit shift register and an 8-bit transpar-
ent latch. The shift register is written through a clock
input, CLK, and a data input, DIN, and the data propa-
gates to a data output, DOUT. The data output allows
multiple drivers to be cascaded and operated together.
The contents of the 8-bit shift register are loaded into
the transparent latch through a latch-enable input, LE.
The latch is transparent to the shift register outputs
when high and latches the current state on the falling
edge of LE. Each driver output is an open-drain, con-
stant-current sink that should be connected to the cath-
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MAX16807.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1680 | 125mA / Frequency-Selectable / Switched-Capacitor Voltage Converters |  Maxim Integrated |
| MAX1680 | Switched-Capacitor Voltage Converters | Maxim Integrated |
| MAX16800 | Adjustable Linear High-Brightness LED (HB LED) Driver | Maxim Integrated Products |
| MAX16801A | Offline and DC-DC PWM Controllers | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |