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PDF MAX16800 Data sheet ( Hoja de datos )
| Número de pieza | MAX16800 | |
| Descripción | Adjustable Linear High-Brightness LED (HB LED) Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX16800 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-3803; Rev 1; 4/09
www.DataSheet4U.com
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED (HB LED) Driver
General Description
The MAX16800 current regulator operates from a 6.5V
to 40V input voltage range and delivers up to a total of
350mA to one or more strings of high-brightness LEDs.
The output current of the MAX16800 is adjusted by
using an external current-sense resistor in series with
the LEDs. An enable input allows wide-range “pulsed”
dimming. Wave-shaping circuitry reduces EMI. The dif-
ferential current-sense input increases noise immunity.
The MAX16800 is well suited for applications requiring
high-voltage input and is able to withstand automotive
load-dump events up to 40V. An on-board pass ele-
ment minimizes external components while providing
±3.5% output current accuracy. Additional features
include a 5V regulated output and short-circuit and
thermal protection.
The MAX16800 is available in a thermally enhanced,
5mm x 5mm, 16-pin TQFN package and is specified
over the automotive -40°C to +125°C temperature range.
Applications
Automotive Interior: Map, Courtesy, and Cluster
Lighting
Automotive Exterior: Tail Lights and CHMSL
Warning Lights for Emergency Vehicles
Navigation and Marine Indicators
General Illumination
Signage, Gasoline Canopies, Beacons
TOP VIEW
Pin Configuration
12 11 10 9
N.C. 13
N.C. 14
EN 15
OUT 16
MAX16800
+
8 N.C.
7 N.C.
6 N.C.
5 N.C.
1234
Features
♦ +6.5V to +40V Operating Range
♦ Adjustable Level (35mA to 350mA)
♦ ±3.5% Output Current Accuracy
♦ Integrated Pass Element with Low-Dropout
Voltage (0.5V typ)
♦ Output Short-Circuit Protection
♦ +5V Regulated Output with 4mA Source
Capability
♦ Thermal Shutdown
♦ Differential LED Current Sense
♦ High-Voltage Enable Pin for Dimming Interface
♦ Low Shutdown Supply Current (12μA typ)
♦ Low 204mV Current-Sense Reference Reduces
Power Losses
♦ Wave-Shaped Soft Edges Reduce Radiated EMI
During PWM Dimming
♦ Available in Small, Thermally Enhanced,
5mm x 5mm, 16-Pin TQFN Package
♦ -40°C to +125°C Operating Temperature Range
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX16800ATE+ -40°C to +125°C
16 TQFN-EP*
MAX16800ATE/V+ -40°C to +125°C
16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed paddle.
/V denotes an automotive qualified part.
Simplified Diagram
+6.5V TO +40V
IN
0.1μF
OUT
MAX16800
+5V REG
V5
0.1μF
CS+
PWM DIMMING
EN
CS-
GND
LEDs
RSENSE
TQFN
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
PIN
1, 16
2, 3
4–8, 13, 14
9
10
11
12
15
—
www.DataSheet4U.com
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED (HB LED) Driver
NAME
OUT
IN
N.C.
CS+
CS-
V5
GND
EN
EP
Pin Description
FUNCTION
Current-Regulated Output. Connect pin 1 to pin 16.
Positive Input Supply. Bypass IN with a 0.1µF (min) capacitor to GND. Connect pin 2 to pin 3.
Not Internally Connected
Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS+
and CS- to program the output current level.
Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor between
CS- and CS+ to program the output current level.
+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.
Ground
Enable Input. Drive EN high to enable the output.
Exposed Pad. Connect to the ground plane for effective power dissipation. Do not use as the only
ground connection.
IN V5
Functional Diagram
EN ENABLE
REGULATOR
REFERENCE
GENERATOR
MAX16800
THERMAL
SHUTDOWN
I_REQ
IN
DIFFERENTIAL
SENSE
AMPLIFIER
OUT
CS+
CS-
Detailed Description
The MAX16800 is a high-current regulator capable of
providing up to a total of 350mA of current to one or
more strings of high-brightness LEDs. A wide operating
input voltage range of +6.5V to +40V makes the
MAX16800 ideal for automotive applications. A +5V
regulated output provides up to 4mA of current to
power external circuitry. In addition, the MAX16800 fea-
tures thermal and output short-circuit protection. The
wide operating voltage range helps protect the
MAX16800 against large transients such as those
found in load-dump situations up to 40V.
The MAX16800 uses a feedback loop to control the out-
put current. The differential voltage across the sense
resistor is compared to a fixed reference voltage, and
the error is amplified to serve as the drive to the internal
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX16800.PDF ] | |
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