MAX16804ATP+-MAX16804ATP+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX16804ATP+-MAX16804ATP+T
High-Voltage, 350mA, High-Brightness LED Driver with Analog and PWM Dimming Control
General Description
The MAX16804 current regulator operates from a 5.5V
to 40V input voltage range and delivers 35mA to 350mA
to one or more strings of high-brightness LEDs (HB
LEDs). The output current of the MAX16804 is set by
using an external current-sense resistor in series with the
LEDs. A dual-mode DIM pin and on-board 200Hz ramp
generator allow PWM dimming with an analog or PWM
input signal. The analog control signal at dimming input
DIM allows for a theater-dimming effect to be implemented.
Fast turn-on and turn-off times ensure a wide-range PWM
operation, while wave-shaping circuitry minimizes EMI. The
differential current-sense input increases LED current
accuracy and noise immunity. The MAX16804 is well suited for
applications requiring high-voltage input and is able to
withstand load-dump events up to 45V. An on-board pass
element minimizes external components while providing
3% output-current accuracy. Additional features include a
5V regulated output and short-circuit and thermal protection.
The MAX16804 is available in a thermally enhanced,
5mm x 5mm, 20-pin TQFN package and is specified over
the automotive -40°C to +125°C temperature range.
Applications●Warning Lights for Emergency Vehicles●Navigation and Marine Indicators●Signage, Canopies, and Beacons
Beneits and Features●Flexible Dimming Control Simplifies Lighting System
DesignAnalog or PWM Control Signal for PWM and
Theater Dimming200Hz On-Board Ramp GeneratorHigh-Voltage (Up to 40V) DIM PinAdditional +5V On-Board Regulator with 2mA
Capability●External Synchronization and Pulse Shaping Reduce
Radio InterferenceWave-Shaped Edges Minimize EMI During PWM
DimmingSyncs to External PWM Signal (Up to 2kHz)●Powers High-Power, High-Brightness LEDs 35mA to 350mA Adjustable LED Current3% LED Current AccuracyDifferential LED Current Sense●Enables High-Efficiency Designs to Minimize Heat
DissipationIntegrated Pass Element with Low-Dropout Voltage
(0.5V typ)200mV Current-Sense Reference Reduces Power
Losses●Thermal Shutdown and Output Short-Circuit
Protection Provide Additional Safety5.5V to 40V Operating Range-40°C to +125°C Operating Temperature Range
Pin Configuration appears at end of data sheet.
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGE
MAX16804ATP+-40°C to +125°C20 TQFN-EP*
MAX16804OUT
LEDs
RSENSE
ILED
0.1µF
+5.5V TO +40V
+5V REG
CS+
0.1µF
CS-
DIM
GNDV5
ANALOG CONTROL PWM DIMMING
MAX16804OUT
LEDs
RSENSE
0.1µF
+5.5V TO +40V
PWM CONTROL DIMMING
+5V REG
CS+
0.1µF
CS-DIM
PWM DIMMING
GND
ILED
MAX16804High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Simpliied Diagrams
Ordering Information
IN to GND...............................................................-0.3V to +45V
DIM, OUT, EN to GND.................................-0.3V to (VIN + 0.3V)
IN Slew Rate (20V < VIN < 45V)...................................250mV/μs
CS+, V5 to GND.......................................................-0.3V to +6V
CS- to GND............................................................-0.3V to +0.3V
OUT Short Circuited to GND Duration
(at VIN < +16V)...............................................................1hour
Maximum Current Into Any Pin (except IN and OUT).........±20mA
Continuous Power Dissipation (TA = +70°C)
20-Pin TQFN (derate 34.5mW/°C above +70°C)....2758.6mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
(VIN = VEN = 12V, CV5 = 0.1μF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω (see the Typical Operating Circuit), VDIM = 4V, TA = TJ = -40°C
to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVIN(Note 2)5.540.0V
Ground CurrentIGILOAD = 350mA2.54.5mA
Shutdown Supply CurrentISHDNVEN ≤ 0.3V1240µA
Guaranteed Output CurrentIOUTRSENSE = 0.55Ω350mA
Output Current Accuracy35mA < IOUT < 350mA, not including
RSENSE tolerance3%
Dropout Voltage (Note 3)∆VDOIOUT = 350mA, 12V < VIN < 40V0.41.2VIOUT = 350mA, 6.5V < VIN < 12V0.51.5
Output Current Slew Rate
(External PWM Signal at DIM)
Current rising, DIM rising to 4V17mA/µsCurrent falling, DIM falling to 0.6V17
Short-Circuit CurrentVOUT = 0V 600 mA
ENABLE INPUT
EN Input CurrentIEN100nA
EN Input-Voltage HighVIH2.8V
EN Input-Voltage LowVIL0.6V
Enable Turn–On TimetONEN rising edge to 90% of OUT250µs
CURRENT SENSE (Note 4)
Regulated RSENSE VoltageVRSENSEVSENSE = VCS+ - VCS-192198204mV
Input Current (CS+) VCS+ = 220mV+14µA
Input Current (CS-)VCS+ = 220mV-75µA
INTERNAL RAMP GENERATOR
Internal Ramp FrequencyfRAMP180200220Hz
External Sync Frequency RangefDIM802000Hz
External Sync Voltage Low0.4V
External Sync Voltage High2.8V
EXTERNAL PWM DIMMING INPUT
DIM Input Current 1µA
Turn-On TimetONAfter DIM rising to 4V (Note 5)2852µs
MAX16804High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VIN = VEN = 12V, CV5 = 0.1μF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω (see the Typical Operating Circuit), VDIM = 4V, TA = TJ = -40°C
to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1)
Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 3: Dropout is measured as follows:Connect a resistor from OUT to CS+. Connect RSENSE = 0.56Ω from CS+ to CS-. Set VIN = VOUT +3V (record VOUT as
VOUT1). Reduce VIN until VOUT = 0.97 x VOUT1 (record as VIN2 and VOUT2). ΔVDO = VIN2 - VOUT2.
Note 4: IV5 = 0mA.
Note 5: tON time includes the delay and the rise time needed for IOUT to reach 90% of its final value. tOFF time is the time needed
for IOUT to drop below 10%. See the Typical Operating Characteristics. tON and tOFF are tested with 13Ω from OUT to CS+.
Note 6: Thermal shutdown does not function if the output of the 5V reference is shorted to ground. Shorting V5 to GND disables the
output.
(VIN = 12V, VEN = VIN, CV5 = 0.1μF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, connect OUT to CS+, VDIM = 4V, TA = +25°C, unless
otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
THERMAL PROTECTION
Thermal-Shutdown TemperatureTJ(SHDN)+155°C
Thermal-Shutdown Hysteresis23°C
+5V REGULATOR
Output Voltage RegulationV50 ≤ IV5 ≤ 2mA4.85.15.4V
V5 Short-Circuit Current V5 = 0V (Note 6)12mA
(VCS+ - VCS-) vs. OUTPUT CURRENT
MAX16804 toc02
OUTPUT CURRENT (mA)
CS+
- V
CS-
) (V)
VIN = 12V
OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX16804 toc03
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)12246810
IOUT = 350mA
IOUT = 100mA
OUTPUT CURRENT
vs. TEMPERATURE
MAX16804 toc01
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
ILOAD = 350mA
ILOAD = 35mA
ILOAD = 200mA
ILOAD = 100mA
MAX16804High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Electrical Characteristics (continued)
Typical Operating Characteristics
(VIN = 12V, VEN = VIN, CV5 = 0.1μF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, connect OUT to CS+, VDIM = 4V, TA = +25°C, unless
otherwise noted.)
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX16804 toc05
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
VIN = 40V
VIN = 20V
VIN = 12V
VIN = 6.5V
+5V REGULATOR OUTPUT
vs. TEMPERATURE
MAX16804 toc06
TEMPERATURE (°C)
+5V REGULATOR OUTPUT (V)
NO LOAD
VIN = 12V
ILOAD = 1mA
ILOAD = 2mA
+5V REGULATOR OUTPUT vs. VIN
MAX16804 toc07
VIN (V)
+5V REGULATOR OUTPUT (V)3025201510
ILOAD = 1mA
NO LOAD
ILOAD = 2mA
(VCS+ - VCS-) vs. IV5
MAX16804 toc08
IV5 (mA)
CS+
- V
CS-
) (V)645231
ILOAD = 350mA
VIN = 12V
200Hz DIMMED OPERATION
MAX16804 toc09
20µs/div
VDIM
2V/div
ILOAD
200mA/div
ILOAD = 350mA
VIN = 12V
DIM PULSED AT
200Hz (1% DUTY
CYCLE)
LED CURRENT FALL TIME (EXPANDED)
MAX16804 toc10
VDIM
2V/div
ILED
200mA/div
DIM PULSED AT
200Hz
DROPOUT VOLTAGE
vs. TEMPERATURE
MAX16804 toc04
TEMPERATURE (°C)
DROPOUT VOLTAGE (V)
VIN = 12V
ILOAD = 350mA
LED CURRENT RISE TIME (EXPANDED)
MAX16804 toc11
VDIM
2V/div
ILED
200mA/div
DIM PULSED AT
200Hz
MAX16804High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Typical Operating Characteristics (continued)
(VIN = 12V, VEN = VIN, CV5 = 0.1μF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, connect OUT to CS+, VDIM = 4V, TA = +25°C, unless
otherwise noted.)
PINNAMEFUNCTION
1, 20OUTCurrent-Regulated Output. Connect pin 1 to pin 20.
2, 3INInput Supply. Bypass IN with a 0.1µF (min) capacitor to GND. Connect pin 2 to pin 3.
4, 9, 11, 18N.C.No Connection. Leave unconnected (internal connection).
5–8, 10, 16GNDGround
12, 15V5+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.CS+Positive Input of the Internal Differential Ampliier. Connect the current-sense resistor between CS+
and CS- to program the output current level. CS-Negative Input of the Internal Differential Ampliier. Connect the current-sense resistor between CS-
and CS+ to program the output current level. DIMDimming Input. See the Dimming Input (DIM) section.ENEnable Input. Drive EN high to enable the output and the 5V LDO.EPExposed Pad. Connect to the ground plane for effective power dissipation. Do not use as the only
ground connection.
OUTPUT CURRENT DUTY CYCLE
vs. ANALOG DIM VOLTAGE
MAX16804 toc12
ANALOG DIM VOLTAGE (V)
OUTPUT CURRENT DUTY CYCLE (%)21
VIN = 12V
IDIM vs. VDIM
MAX16804 toc13
VDIM (V)
IDIM
(µA)12108642
VIN = 16V
MAX16804High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Typical Operating Characteristics (continued)
Pin Description
Detailed Description
The MAX16804 is a high-current regulator that
operates from a wide input voltage range of 5.5V to 40V
and is capable of providing up to 350mA of current to
one or more strings of HB LEDs. A +5V regulated output
provides up to 2mA of current to power external circuitry.
In addition, the MAX16804 features thermal and output
short-circuit protection. The wide operating voltage range
helps protect the MAX16804 against large transients such
as those found in load-dump situations up to 45V.
The MAX16804 uses a feedback loop to control the
output 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 pass
device (see the Functional Diagram). The regulation point
is factory-set at (VCS+ - VCS-) = 198 ±6mV. The regulated
current is user-defined by the value of RSENSE.
The MAX16804 is a current controller internally optimized
for driving the impedance range expected from one to ten
or more HB LEDs.
Dimming Input (DIM)
The MAX16804’s dimming input functions with either an
analog or PWM control signal. If the pulse detector detects
three edges of a PWM signal with a frequency range
between 80Hz and 2kHz, the MAX16804 synchronizes to
external PWM input signal and pulse-width modulates the
LED current. If an analog control signal is applied to DIM, the
MAX16804 compares the DC input to an internally gener-
ated 200Hz ramp to pulse-width modulate the LED current.
The output current duty cycle is adjustable from 0% to
100% (0.21V < VDIM < 3.1V).
Use the following formula to calculate the output current
duty cycle:
Duty cycle = (VDIM - 0.21V)/(2.895V) (1)
MAX16804
DIM
REGULATOR
1.25VV5
DIFFERENTIAL
SENSE
AMPLIFIER
THERMAL
SHUTDOWN
POR
200Hz RAMP
GENERATOR
210mV
MUX
GND
I_REG
OUT
CS+
CS-
TRIMMED
BANDGAP
PULSE
DETECTOR
MAX16804High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX16804ATP+	MAXIM	N/a	13	avai	High-Voltage, 350mA, High-Brightness LED Driver with Analog and PWM Dimming Control
MAX16804ATP+T	MAXIM	N/a	32500	avai	High-Voltage, 350mA, High-Brightness LED Driver with Analog and PWM Dimming Control