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MAX16835ATE+MAIXMN/a1500avaiHigh-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver
MAX16835ATE+ |MAX16835ATEMAXIMN/a86avaiHigh-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver
MAX16835ATE+T |MAX16835ATETMAXIMN/a4989avaiHigh-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver


MAX16835ATE+T ,High-Voltage, 350mA, Adjustable Linear High-Brightness LED DriverELECTRICAL CHARACTERISTICS(V = V = +12V, C = 0.1µF to GND, I = 0, CS- = GND, connect R = 0.58Ω betw ..
MAX16836ASA+ ,High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V RegulatorELECTRICAL CHARACTERISTICS(V = V = +12V, C = 0.1µF to GND, I = 0, V = 0V, V = +4V, connect R = 0.58 ..
MAX16836ASA+ ,High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V RegulatorApplications 5mm x 5mm, 16-Pin TQFN Package and in 8-PinSO with Exposed Pad PackageAutomotive Inter ..
MAX1683EUK ,Switched-Capacitor Voltage DoublersFeaturesThe ultra-small MAX1682/MAX1683 monolithic, CMOS♦ 5-Pin SOT23 Packagecharge-pump voltage do ..
MAX1683EUK+T ,Switched-Capacitor Voltage DoublersELECTRICAL CHARACTERISTICS(V = +5.0V, capacitor values from Table 2, T = 0°C to +85°C, unless other ..
MAX1683EUK-T ,Switched-Capacitor Voltage DoublersELECTRICAL CHARACTERISTICS(V = +5.0V, capacitor values from Table 2, T = 0°C to +85°C, unless other ..
MAX4477ASA+ ,SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Ampsapplications that require low distortion and/or♦ 10MHz GBW Product, Unity-Gain Stablelow noise. (MA ..
MAX4477ASA+T ,SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Ampsapplications that require low distortion and/or♦ 10MHz GBW Product, Unity-Gain Stablelow noise. (MA ..
MAX4477ASA+T ,SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op AmpsFeatures♦ Low Input Voltage-Noise Density: 4.5nV/√HzThe MAX4475–MAX4478/MAX4488/MAX4489 wide-band, ..
MAX4477AUA ,SOT23 / Low-Noise / Low-Distortion / Wide-Band / Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS(V = +5V, V = 0V, V = 0V, V = V /2, R tied to V /2, SHDN = V , T = -40°C ..
MAX4477AUA+ ,SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op Ampsapplications that require low distortion and/or♦ 10MHz GBW Product, Unity-Gain Stablelow noise. (MA ..
MAX4477AUA+ ,SOT23, Low-Noise, Low-Distortion, Wide-Band, Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS (continued)(V = +5V, V = 0V, V = 0V, V = V /2, R tied to V /2, SHDN = V ..


MAX16835ATE+-MAX16835ATE+T
High-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver
General Description
The MAX16835 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
(HB LEDs). The output current of the MAX16835 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 differential current-sense input
increases noise immunity. The MAX16835 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 element minimizes external compo-
nents while providing ±3.5% output current accuracy.
Additional features include a 5V regulated output and
short-circuit and thermal protection.
The MAX16835 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
Features
+6.5V to +40V Operating RangeAdjustable LED Current (35mA to 350mA)±3.5% Output Current AccuracyIntegrated Pass Element with Low-Dropout
Voltage (0.55V typ)
Output Short-Circuit Protection+5V Regulated Output with 4mA Source
Capability
Thermal ShutdownDifferential LED Current SenseHigh-Voltage Enable Pin for Dimming InterfaceLow Shutdown Supply Current (35µA typ)Low 200mV Current-Sense Reference ReducesPower LossesWave-Shaped Edges Reduce Radiated EMI DuringPWM DimmingAvailable in Small, Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN Package-40°C to +125°C Operating Temperature Range
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver

N.C.
OUTCS+GND
N.C.119
OUT
N.C.
N.C.
N.C.
N.C.
MAX16835
CS-
N.C.
TOP VIEW
Pin Configuration
Ordering Information

MAX16835OUTLEDs
RSENSE
0.1μF
+6.5V TO +40V
+5V REG
CS+
0.1μF
CS-EN
PWM DIMMING
GND
Simplified Diagram
MAX16835

+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.denotes an automotive qualified part.
PARTTEMP RANGEPIN-PACKAGE

MAX16835ATE+-40°C to +125°C16 TQFN-EP*
MAX16835ATE/V+-40°C to +125°C16 TQFN-EP*
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
MAX16835
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= VEN = +12V, CV5= 0.1µF to GND, IV5= 0, CS- = GND, connect RSENSE= 0.58Ωbetween CS+ and CS-. TA= -40°C to
+125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 2 and 3)
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.
IN to GND...............................................................-0.3V to +45V
OUT, EN to GND..........................................-0.3V to (VIN+ 0.3V)
CS+, CS-, and V5 to GND........................................-0.3V to +6V
OUT Short Circuited to GND Duration
(at VIN= +16V)........................................................60 minutes
Maximum Current into Any Pin (except IN and OUT).........±20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN 5mm x 5mm
(derate 33.3mW/°C above +70°C)...........................2666.7mW
Operating Junction 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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply Voltage RangeVIN(Note 2)6.540.0V
Ground CurrentIGILOAD = 350mA1.283mA
Shutdown Supply CurrentISHDNVEN ≤ 0.6V3570µA
Guaranteed Output CurrentIOUTRSENSE = 0.55Ω350mA
Output Current Accuracy35mA < IOUT < 350mA±3.5%
IOUT = 350mA (current pulsed),
12V < VIN < 40V0.551.2V
Dropout Voltage (Note 4)∆VDO
IOUT = 350mA (current pulsed),
6.5V < VIN < 40V0.551.5V
Current rising7.8Output Current Slew RateCurrent falling7.8mA/µs
Short-Circuit CurrentVIN = 12V, VCS+ = 0V400500650mA
LOGIC INPUT

EN Input CurrentIEN-2.5-1.0-0.2µA
EN Input Voltage HighVIH2.8V
EN Input Voltage LowVIL0.6V
Turn-On TimetONVEN rising edge to 90% of OUT110350µs
CURRENT SENSE

Regulated RSENSE VoltageVSENSEVSENSE = VCS+ - VCS-193200207mV
Input Current (CS+)VCS+ = 220mV2.77.0µA
Input Current (CS-)VCS+ = 220mV-50-17.2µA
Note 1:
Package thermal resistances obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, see www.maximintegrated.com/thermal-tutorial.
PACKAGE THERMAL CHARACTERISTICS (Note 1)

Junction-to-Ambient Thermal Resistance (θJA)...............30°C/W
Junction-to-Case Thermal Resistance (θJC).........................2°C/W
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
MAX16835
Note 2:
Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 3:
All devices 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 4:
Dropout is measured as follows:
Connect RO= 27Ωfrom OUT to CS+. Connect RSENSE= 0.58Ωfrom CS+ to CS-. Set VIN= +12V (record VOUTas VOUT1).
Reduce VINuntil VOUT= 0.97 x VOUT1(record as VIN2and VOUT2). ∆VDO= VIN2- VOUT2.
Note 5:
Current regulation varies with V5 load (see the Typical Operating Characteristics).
Note 6:
Thermal shutdown does not function if the output of the 5V reference is shorted to ground.
ELECTRICAL CHARACTERISTICS (continued)

(VIN= VEN = +12V, CV5= 0.1µF to GND, IV5= 0, CS- = GND, connect RSENSE= 0.58Ωbetween CS+ and CS-. TA= -40°C to
+125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 2 and 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
THERMAL OVERLOAD

Thermal-Shutdown Temperature+159°C
Thermal-Shutdown Hysteresis24°C
+5V REGULATOR

Output VoltageVV54.855.005.20V
Output Voltage Load Regulation∆V50 < ILOAD < 4mA (Note 5)1220mV/mA
V5 Short-Circuit CurrentV5 = 0V (Note 6)15mA
Typical Operating Characteristics

(VIN= VEN= +12V, TA= +25°C, unless otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE

MAX16835 toc01
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
ILOAD = 350mA
ILOAD = 35mA
ILOAD = 200mA
ILOAD = 100mA
(VCS+ - VCS-)
vs. OUTPUT CURRENT

MAX16835 toc02
OUTPUT CURRENT (mA)
CS+
- V
CS-
) (V)
OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX16835 toc03
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)30510152025
040
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driverypical Operating Characteristics (continued)

(VIN= VEN= +12V, TA= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. TEMPERATURE

MAX16835 toc04
TEMPERATURE (°C)
DROPOUT VOLTAGE (V)
ILOAD = 350mA
SHUTDOWN CURRENT
vs. TEMPERATURE

MAX16835 toc05
TEMPERATURE (°C)
SHUTDOWN CURRENT (
VIN = 40V
VIN = 20V
VIN = 12V
VIN = 6.5V
+5V REGULATOR OUTPUT
vs. TEMPERATURE

MAX16835 toc06
TEMPERATURE (°C)
+5V REGULATOR OUTPUT (V)
IV5 = 1mANO LOAD
IV5 = 5mA
(VCS+ - VCS-) vs. IV5

MAX16835 toc07
IV5 (mA)
CS+
- V
CS-
) (V)321
ILOAD = 350mA
+5V REGULATOR OUTPUT vs. VIN

MAX16835 toc08
VIN (V)
+5V REGULATOR OUTPUT (V)3025201510
NO LOADIV5 = 5mA
IV5 = 5mA
200Hz DIMMED OPERATION

MAX16835 toc09
1ms/div
VIN
5V/div
ILOAD
200mA/div
ILOAD = 350mA, VIN = VEN,
VIN PULSED AT 200Hz (50% DUTY CYCLE)
MAX16835
200Hz DIMMED OPERATION EXPANDED

MAX16835 toc10
VIN
5V/div
ILOAD
200mA/div
ILOAD = 350mA
VIN = VEN
VIN PULSED AT 200Hz
(50% DUTY CYCLE)
200Hz DIMMED OPERATION EXPANDED

MAX16835 toc11
VIN
5V/div
ILED
200mA/div
ILOAD = 350mA
VIN = VEN
VIN PULSED AT 200Hz
(50% DUTY CYCLE)
200Hz DIMMED OPERATION

MAX16835 toc12
10V/div
ILED
200mA/div
ILOAD = 350mA, VIN = 12V,
EN PULSED AT 200Hz (50% DUTY CYCLE)
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
Pin Description
PINNAMEFUNCTION

1, 16OUTCurrent-Regulated Output. Connect pin 1 to pin 16.
2, 3INPositive Input Supply. Bypass IN with a 0.1µF (min) capacitor to GND. Connect pin 2 to pin 3.
4–8, 13, 14N.C.No Connection. Not internally connected.CS+Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor between CS+
and CS- to program the output current level.CS-Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor between
CS- and CS+ to program the output current level.V5+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.GNDGroundENEnable Input. Drive EN high to enable the output.
—EPExposed Pad. Connect to the ground plane for effective power dissipation. Do not use as the only
ground connection.
Functional Diagram

MAX16835
ENABLEENREFERENCE
GENERATOR
REGULATORV5
DIFFERENTIAL
SENSE
AMPLIFIER
THERMAL
SHUTDOWN
I-REG
OUT
CS+
CS-
Detailed Description

The MAX16835 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
MAX16835 ideal for automotive applications. A +5V
regulated output provides up to 4mA of current to
features thermal and output short-circuit protection.
The wide operating voltage range helps protect the
MAX16835 against large transients such as those
found in load-dump situations up to 40V.
The MAX16835 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
MAX16835
High-Voltage, 350mA, Adjustable Linear
High-Brightness LED Driver
MAX16835

power series pass device (see the Functional Diagram).
The regulation point is factory set at (VCS+- VCS-) =
200mV ±3.5%. The regulated current is user defined by
the value of RSENSE.
The MAX16835 is a current controller internally opti-
mized for driving the impedance range expected from
one or more HB LEDs.
+5V Regulator

The MAX16835 includes a fixed +5V output regulator
that delivers up to 4mA of load current for low-power
applications throughout the +6.5V to +40V input volt-
age range. Connect a 0.1µF compensation capacitor
from V5 to ground. Shorting V5 to ground disables the
thermal shutdown. When EN is low, V5 is off.
Thermal Protection

The MAX16835 enters a thermal-shutdown mode in the
event of overheating. This typically occurs in overload or
output short-circuit conditions. When the junction tem-
perature exceeds TJ= +159°C (typ), the internal ther-
mal-protection circuitry turns off the series pass device.
The MAX16835 recovers from thermal-shutdown mode
once the junction temperature drops by 24°C (typ). The
part therefore protects itself by thermally cycling in the
event of a short-circuit or overload condition. Shorting V5
to ground disables the thermal shutdown.
Applications Information
Programming the LED Current

The MAX16835 uses a sense resistor across CS+ and
CS- to set the LED current. The differential sense amplifier
connected across RSENSE provides ground-loop immu-
nity and low-frequency noise rejection. The LED current
is given by the equation below:
ILED= VSENSE/RSENSE
Input Voltage Considerations

For proper operation, the minimum input voltage must
always be:
VIN(MIN)≥VSENSE(MAX)+ VFT(MAX+ ∆VDO(MAX)
where VFT(MAX)is the total forward voltage of all series-
connected LEDs. The minimum operating voltage of the
device is +6.5V. The device operates below +6.5V;
However, the output current may not meet the full regu-
lation specification.
Low-Frequency PWM
at the Output

The MAX16835 provides pulsed or chopped current
dimming. Generally, HB LEDs are binned to match at
their full-rated current; however, LEDs from the same
bin exhibit poor matching at currents other than full-
rated current. To achieve uniformity, HB LED manufac-
turers recommend PWM pulsing of the LED current at
their full-rated value. There are two methods for pro-
ducing a PWM output. One method is by pulsing the
enable input (EN) while having a constant voltage at IN.
The other method is to connect EN to IN and pulse both
EN and IN. Both methods generate a regulated-ampli-
tude PWM current (variable duty cycle) that can pro-
vide control over the LED brightness (see Figures 1
and 2).1513
VIN
N.C.
GND
CS-
RSENSE
CS+
MAX16835
N.C.N.C.N.C.N.C.
OUTENN.C.N.C.
OUT
VEN
ILED
Figure 1. Pulse Application with VINat a Constant Voltage1513
VIN
N.C.
GND
CS-
RSENSE
CS+
MAX16835
N.C.N.C.N.C.N.C.
OUTENN.C.N.C.
OUTILED
Figure 2. Pulse Application with EN Connected to VIN
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