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MAX16831ATJ/V+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
EVALUATION KIT AVAILABLE
19-0809; Rev 2; 1/13
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
General Description
The MAX16831 is a current-mode, high-brightness LED
(HBLED) driver designed to control two external
n-channel MOSFETs for the single-string LED current
regulation. The MAX16831 integrates all the building
blocks necessary to implement fixed-frequency HBLED
drivers with wide-range dimming control. The
MAX16831 is configurable to operate as a step-down
(buck), step-up (boost), or step-up/-down (buck-boost)
current regulator.
Current-mode control with leading-edge blanking simpli-
fies control-loop design. Internal slope compensation
stabilizes the current loop when operating at duty cycles
above 50%. The MAX16831 operates over a wide input
voltage range and is capable of withstanding automo-
tive load-dump events. Multiple MAX16831s can be
synchronized to each other or to an external clock. The
MAX16831 includes a floating dimming driver for
brightness control with an external n-channel MOSFET
in series with the LED string.
HBLED drivers using the MAX16831 achieve efficien-
cies of over 90% in automotive applications. The
MAX16831 also includes a 1.4A source and 2.5A sink
gate driver for driving switching MOSFETs in high-power
LED driver applications, such as front light assemblies.
The dimming control allows for wide PWM dimming at
frequencies up to 2kHz. Higher dimming ratios of up to
1000:1 are achievable at lower dimming frequencies.
The MAX16831 is available in a 32-pin thin QFN package
with exposed pad and operates over the -40°C to
+125°C automotive temperature range.
Applications
Automotive Exterior Lighting:
High-Beam/Low-Beam/Signal Lights
Rear Combination Lights (RCL)
Daytime Running Lights (DRL)
Fog Light and Adaptive Front Light Assemblies
Industrial and Architectural Lighting
Emergency Lighting
Projectors with RGB LED Light Sources
Navigation and Marine Indicators
Features
o Wide Input Range: 6V to 76V With Cold-Start
Operation to 5.5V
o Integrated Differential LED Current-Sense
Amplifier
o Floating Dimming Driver Capable of Driving an
n-Channel MOSFET
o 5% LED Current Accuracy
o 200Hz On-Board Ramp Syncs to External PWM
Dimming Signal
o Programmable Switching Frequency (125kHz to
600kHz) and Synchronization
o Output Overvoltage Load Dump, LED Short,
Overtemperature Protection
o Low 107mV LED Current Sense for High
Efficiency
o Enable/Shutdown Input with Shutdown Current
Below 45µA
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX16831ATJ+ -40°C to +125°C 32 TQFN-EP*
MAX16831ATJ/V+ -40°C to +125°C 32 TQFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
/V denotes an automotive qualified part.
V
IN
DIM
R
CS
C
F
R
T
C
REG1
R
UV2
DRV
DRI
REG1
DIM
CS
V
CC
SNS+
FB
QGND
RTSYNC
CS-
CS+
LO
COMP
REG2
DGT
HI
OV
UVEN
SNS-
AGND
R
SENSE
R2
C2
R
OV1
R
OV2
CLMP
SGND
C
CLMP
C
REG2
R1
C1
R
D
LEDs
BUCK-BOOST CONFIGURATION
R
UV1
C
UVEN
Q
S
MAX16831
Typical Operating Circuits
Pin Configuration appears at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= V
UVEN
= 14V, C
REG1
= 1µF, C
REG2
= 1µF, C
CLMP
= 0.1µF, R
T
= 25kΩ, T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical specifications are at T
A
= +25°C.)
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.
V
CC
, HI, LO, CLMP to QGND.................................-0.3V to +80V
CS+, CS-, DGT, UVEN to QGND............................-0.3V to +80V
UVEN to QGND ..........................................-0.3V to (V
CC
+ 0.3V)
DRV to SGND .........................................................-0.3V to +18V
DRI, REG2, DIM to AGND ......................................-0.3V to +18V
QGND, SGND to AGND ........................................-0.3V to +0.3V
SNS+ to SNS- ...........................................................-0.3V to +6V
CS, FB, COMP, SNS+, SNS-, OV, REF,
RTSYNC to AGND .................................................-0.3V to +6V
REG1, CLKOUT to AGND ........................................-0.3V to +6V
CS+ to CS- .............................................................-0.3V to +12V
HI to LO ..................................................................-0.3V to +36V
CS+, CS-, DGT, CLMP to LO .................................-0.3V to +12V
CS+, CS-, DGT, CLMP to LO ........................-0.3V to (HI + 0.3V)
HI to CLMP .............................................................-0.3V to +28V
Continuous Power Dissipation* (T
A
= +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C) ........2758mW
Thermal Resistance*
θ
JA
.................................................................................29°C/W
θ
JC
................................................................................1.7°C/W
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Reflow Temperature.........................................................+240°C
Lead Temperature (soldering, 10s) .................................+300°C
*As per JEDEC 51 standard, multilayer board (PCB).
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
CC
5.5 76.0 V
Supply Current I
Q
I
REG2
= 0A 2.7 4.5 mA
Shutdown Current I
SHDN
V
UVEN
≤ 0.8V 25 45 µA
UVEN
V
CC_R
V
CC
rising 5.5 6.0
V
CC
UVLO Threshold
V
CC_F
V
CC
falling 5.0 5.5
V
V
CC
Threshold Hysteresis V
CC_HYS
0.4 V
V
UVR
V
UVEN
rising 1.100 1.244 1.360
UVEN Threshold
V
UVF
V
UVEN
falling 1.000 1.145 1.260
V
UVEN Input Current I
UVEN
V
UVEN
= 0V and V
UVEN
= 76V, V
CC
= 77V -0.2 +0.2 µA
REGULATORS
0 ≤ I
REG1
≤ 2mA, 7.5V ≤ V
CC
≤ 76V 4.75 5.00 5.25
REG1 Regulator Output V
REG1
I
REG1
= 2mA, V
CC
= 5.7V 4.00 4.50 5.25
V
REG1 Dropout Voltage I
REG1
= 2mA (Note 1) 0.5 1.0 V
REG1 Load Regulation ∆V/∆IV
CC
= 7.5V, 0 ≤ I
REG1
≤ 2mA 25 Ω
7.5V ≤ V
CC
≤ 76V, I
REG2
= 1mA 6.65 7.00 7.35
REG2 Regulator Output V
REG2
V
CC
= 5.7V, 0 ≤ I
REG2
≤ 20mA 4.5 5.0
V
REG2 Dropout Voltage I
REG2
= 20mA (Note 1) 0.5 V
REG2 Load Regulation ∆V/∆IV
CC
= 7.5V, 0 ≤ I
REG2
≤ 20mA 25 Ω
HIGH-SIDE REGULATOR (CLMP) (All Voltages Referred to LO) (Note 2)
CLMP UVLO Threshold V
CLMPTH
V
CLMP
rising 2.0 2.5 3.0 V
CLMP UVLO Threshold
Hysteresis
V
CLMPHYS
0.22 V
MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
3
Maxim Integrated
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
8.7V ≤ (V
HI
- V
LO
) ≤ 36V, I
CLMP
= 1mA 5.5 8.0 10.0
CLMP Regulator Output Voltage V
CLMP
5.0V ≤ (V
HI
- V
LO
) ≤ 8.7V, I
CLMP
= 250µA
(V
HI
- V
LO
)
- 0.7
V
CURRENT-SENSE AMPLIFIER (CSA)
Differential Input Voltage Range
V
CS+
-
V
CS-
0 0.3 V
Common-Mode Range 0V
CC
V
CS+ Input Bias Current I
CS+
V
CS+
- V
CS-
= 0.3V -250 +250 µA
CS- Input Bias Current I
CS-
V
CS+
- V
CS-
= 0.3V 400 µA
Unity-Gain Bandwidth From (CS+ - CS-) to CS 1.0 MHz
REF OUTPUT BUFFER
REF Output Voltage V
REF
-100µA ≤ I
REF
≤ +100µA 2.85 3.00 3.15 V
DIM DRIVER
V
CLMP
- V
LO
= 4V 5 20
Source Current
V
CLMP
- V
LO
= 8V 30 67
mA
V
CLMP
- V
LO
= 4V 10 22
Sink Current
V
CLMP
- V
LO
= 8V 40 76
mA
GATE DRIVER
DRI UVLO Threshold V
UVLO_TH
DRI rising 4.0 4.2 4.4 V
DRI UVLO Threshold Hysteresis V
UVLO_HYST
0.3 V
Z
OUT_L
V
DRI
= 7.0V, DRV sinking 250mA 2.8 4
Driver Output Impedance
Z
OUT_H
V
DRI
= 7.0V, DRV sourcing 250mA 5.0 8
Ω
Peak Sink Current I
SK
V
DRI
= 7.0V 2.5 A
Peak Source Current I
SR
V
DRI
= 7.0V 1.4 A
PWM, ILIM, AND HICCUP COMPARATOR
PWM Comparator Offset Voltage V
COMP
- (V
SNS+
- V
SNS-)
0.7 V
Peak Current-Limit Comparator
Trip Threshold
160 200 240 mV
Peak Current-Limit Comparator
Propagation Delay (Excluding
Blanking Time)
50mV overdrive 40 ns
HICCUP Comparator Trip
Threshold
235 300 385 mV
SNS+ Input Bias Current V
SNS+
= 0V, V
SNS-
= 0V -100 -65 µA
SNS- Input Bias Current V
SNS+
= 0V, V
SNS-
= 0V -100 -65 µA
Blanking Time t
BLNK
40 ns
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
UVEN
= 14V, C
REG1
= 1µF, C
REG2
= 1µF, C
CLMP
= 0.1µF, R
T
= 25kΩ, T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical specifications are at T
A
= +25°C.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX16831ATJ/V+

Mfr. #:
Buy MAX16831ATJ/V+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers w/Analog & PWM Dimming Control
Lifecycle:
New from this manufacturer.
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