EVALUATION KIT AVAILABLE
MAX16833/MAX16833B/C/D/G
High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
General Description
The MAX16833, MAX16833B, MAX16833C, MAX16833D,
and MAX16833G are peak current-mode-controlled LED
drivers for boost, buck-boost, SEPIC, flyback, and high-
side buck topologies. A dimming driver designed to drive
an external p-channel in series with the LED string pro-
vides wide-range dimming control. This feature provides
extremely fast PWM current switching to the LEDs with
no transient overvoltage or undervoltage conditions.
In addition to PWM dimming, the ICs
provide
analog
dimming using a DC input at ICTRL. The ICs sense the
LED current at the high side of the LED string.
A single resistor from RT/SYNC to ground sets the
switching frequency from 100kHz to 1MHz, while an
external clock signal capacitively coupled to RT/SYNC
allows the ICs to synchronize to an external clock. In the
MAX16833/C/G, the switching frequency can be dithered
for spread-spectrum applications. The MAX16833B/D
instead provide a 1.64V reference voltage with a 2%
tolerance.
The ICs operate over a wide 5V to 65V supply range
and include a 3A sink/source gate driver for driving a
power MOSFET in high-power LED driver applications.
Additional features include a fault-indicator output (FLT)
for short or overtemperature conditions and an overvolt-
age-protection sense input (OVP) for overvoltage protec-
tion. High-side current sensing combined with a p-channel
dimming MOSFET allow the positive terminal of the LED
string to be shorted to the positive input terminal or to
the negative input terminal without any damage. This is a
unique feature of the ICs.
Benefits and Features
●
Integration Minimizes BOM for High-Brightness LED
Driver with a Wide Input Range Saving Space and
Cost
• +5V to +65V Wide Input Voltage Range with a
Maximum 65V Boost Output
• Integrated High-Side pMOS Dimming MOSFET
Driver (Allows Single-Wire Connection to LEDs)
• ICTRL Pin for Analog Dimming
•
Integrated High-Side Current-Sense Amplifier
• Full-Scale, High-Side, Current-Sense Voltage of
200mV
●
Simple to Optimize for Efficiency, Board Space, and
Input Operating Range
• Boost, SEPIC, and Buck-Boost Single-Channel
LED Drivers
• 2% Accurate 1.64V Reference (MAX16833B/D)
• Programmable Operating Frequency (100kHz to
1MHz) with Synchronization Capability
• Frequency Dithering for Spread-Spectrum
Applications (MAX16833/C/G)
• Thermally Enhanced 5mm x 4.4mm, 16-Pin
TSSOP Package with Exposed Pad
●
Protection Features and Wide Temperature Range
Increase System Reliability
• Short-Circuit, Overvoltage, and Thermal Protection
• Fault-Indicator Output
• -40°C to +125°C Operating Temperature Range
Simplified Operating Circuit
6V TO 18V
WITH LOAD
DUMP UP
TO 70V
IN
NDRV
CS
OVP
ISENSE+
PWMDIM
ISENSE-
DIMOUT
Applications
●
Automotive Exterior Lighting:
High-Beam/Low-Beam/Signal/Position Lights
Daytime Running Lights (DRLs)
Fog Light and Adaptive Front Light Assemblies
●
Commercial, Industrial, and Architectural Lighting
MAX16833
PWMDIM
Ordering Information
appears at end of data sheet.
LED+
PGND
LED-
19-5187; Rev 12; 8/17
MAX16833/MAX16833B/C/D/G
High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
Absolute Maximum Ratings
IN to PGND .......................................................... -0.3V to +70V
ISENSE+, ISENSE-,
DIMOUT
to PGND .............. -0.3V to +80V
DIMOUT
to ISENSE+ ..............................................-9V to +0.3V
ISENSE- to ISENSE+...........................................-0.6V to +0.3V
PGND to SGND....................................................-0.3V to +0.3V
V
CC
to PGND ..........................................................-0.3V to +9V
NDRV to PGND ........................................ -0.3V to (V
CC
+ 0.3V)
OVP,
PWMDIM,
COMP, LFRAMP, REF, ICTRL,
RT/SYNC,
FLT
to SGND ..................................-0.3V to +6.0V
CS to PGND .........................................................-0.3V to +6.0V
Continuous Current on IN ................................................100mA
Peak Current on NDRV ........................................................
Q3A
Continuous Current on NDRV .......................................
Q100mA
Short-Circuit Duration on V
CC
...................................Continuous
Continuous Power Dissipation (T
A
= +70NC)
16-Pin TSSOP (derate 26.1mW/NC above +70NC) .....2089mW
Operating Temperature Range ....................... -40NC to +125NC
Junction Temperature ......................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................. +300NC
Soldering Temperature (reflow) .......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
Package Thermal Characteristics
(Note 1)
16 TSSOP
Junction-to-Ambient Thermal Resistance (q
JA
) .......38.3°C/W
Junction-to-Case Thermal Resistance (q
JC
) .................3°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
IN
= 12V, R
RT
= 12.4kI, C
IN
= C
VCC
= 1µF, C
LFRAMP
/C
REF
= 0.1µF, NDRV = COMP =
DIMOUT
= PWMDIM =
FLT
= unconnected,
V
OVP
= V
CS
= V
PGND
= V
SGND
= 0V, V
ISENSE+
= V
ISENSE-
= 45V, V
ICTRL
= 1.40V, T
A
= T
J
= -40NC to +125NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
SYSTEM SPECIFICATIONS
Operational Supply Voltage
Supply Current
Undervoltage Lockout (UVLO)
UVLO Hysteresis
Startup Delay
UVLO Falling Delay
V
CC
LDO REGULATOR
Regulator Output Voltage
Dropout Voltage
Short-Circuit Current
OSCILLATOR (RT/SYNC)
Switching Frequency Range
Bias Voltage at RT/SYNC
Maximum Duty Cycle
Oscillator Frequency Accuracy
V
CC
I
MAXVCC
f
SW
V
DOVCC
SYMBOL
V
IN
I
INQ
UVLOR
IN
UVLOF
IN
CONDITIONS
MIN
5
PWMDIM = 0, no switching
Switching
V
IN
rising
4.2
4.05
V
IN
falling, I
VCC
= 35mA
1.5
2.5
4.55
4.3
250
410
3.3
6.75
55
100
1
V
CS
= 0V; MAX16833/MAX16833B only
V
CS
= 0V; MAX16833C/MAX16833D/
MAX16833G only
87.5
93
-5
88.5
94
89.5
95
+5
%
%
6.95
0.15
100
7.15
0.35
150
1000
TYP
MAX
65
2.5
4
4.85
4.65
UNITS
V
mA
V
mV
Fs
Fs
t
START_DELAY
During power-up
t
FALL_DELAY
During power-down
0.1mA
P
I
VCC
P
50mA, 9V
P
V
IN
P
14V
14V
P
V
IN
P
65V, I
VCC
= 10mA
I
VCC
= 50mA, V
IN
= 5V
V
CC
= 0V, V
IN
= 5V
V
V
mA
kHz
V
V
RT
D
MAX
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Maxim Integrated
│
2
MAX16833/MAX16833B/C/D/G
High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
Electrical Characteristics (continued)
(V
IN
= 12V, R
RT
= 12.4kI, C
IN
= C
VCC
= 1µF, C
LFRAMP
/C
REF
= 0.1µF, NDRV = COMP =
DIMOUT
= PWMDIM =
FLT
= unconnected,
V
OVP
= V
CS
= V
PGND
= V
SGND
= 0V, V
ISENSE+
= V
ISENSE-
= 45V, V
ICTRL
= 1.40V, T
A
= T
J
= -40NC to +125NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
Synchronization Logic-High Input
Synchronization Frequency Range
SLOPE COMPENSATION
Slope Compensation
Current-Ramp Height
SYMBOL
V
IH-SYNC
f
SYNCIN
I
SLOPE
CONDITIONS
V
RT
rising
MIN
3.8
1.1f
SW
Ramp peak current added to CS input per
switching cycle
46
80
80
50
100
100
2
V
RT
1.604
0
200
1.636
35
400
200
2
195
38.4
5
6.15
199
100
40
5
2100
-300
100
100
400
400
2
50
Includes leading-edge blanking time with
10mV overdrive
55
406
10mV overdrive (excluding leading-edge
blanking time)
80
418
30
50
110
430
3500
75
+300
700
700
4900
41.4
MHz
FS
dB
nA
FA
FA
V
ns
ns
mV
ns
ns
203
mV
8
1.669
200
700
TYP
MAX
1.5f
SW
54
120
120
FA
UNITS
V
DITHERING RAMP GENERATOR (LFRAMP) (MAX16833/MAX16833C/MAX16833G only)
Charging Current
V
LFRAMP
= 0V
Discharging Current
Comparator High Trip Threshold
Comparator Low Trip Threshold
REFERENCE OUTPUT (REF) (MAX16833B/MAX16833D only)
Reference Output Voltage
V
REF
I
REF
= 0 to 80FA
ANALOG DIMMING (ICTRL)
Input-Bias Current
IB
ICTRL
V
ICTRL
= 0.62V
V
ISENSE+
= 65V, V
ISENSE-
= 64.8V
V
LFRAMP
= 2.2V
FA
FA
V
V
V
nA
FA
FA
FA
V/V
LED CURRENT-SENSE AMPLIFIER
ISENSE+ Input-Bias Current
IB
ISENSE+
ISENSE+ Input-Bias Current with
V
= 48V, V
ISENSE-
= 48V,
IB
ISENSE+OFF ISENSE+
DIM Low
PWMDIM = 0
ISENSE- Input-Bias Current
Voltage Gain
Current-Sense Voltage
Bandwidth
COMP
Transconductance
Open-Loop DC Gain
COMP Input Leakage
COMP Sink Current
COMP Source Current
PWM COMPARATOR
Input Offset Voltage
Leading-Edge Blanking
Propagation Delay to NDRV
CS LIMIT COMPARATOR
Current-Limit Threshold
CS Limit-Comparator
Propagation Delay to NDRV
Leading-Edge Blanking
IB
ISENSE-
V
ISENSE+
= 65V, V
ISENSE-
= 64.8V
V
ICTRL
= 1.4V
V
SENSE
BW
GM
COMP
I
LCOMP
I
SOURCE
V
OS-PWM
t
ON(MIN)
V
CS_LIMIT
t
CS_PROP
I
SINK
AV
OTA
V
ICTRL
= 0.616V
AV
DC
- 3dB
V
ICTRL
= 0.2465V
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Maxim Integrated
│
3
MAX16833/MAX16833B/C/D/G
High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
Electrical Characteristics (continued)
(V
IN
= 12V, R
RT
= 12.4kI, C
IN
= C
VCC
= 1µF, C
LFRAMP
/C
REF
= 0.1µF, NDRV = COMP =
DIMOUT
= PWMDIM =
FLT
= unconnected,
V
OVP
= V
CS
= V
PGND
= V
SGND
= 0V, V
ISENSE+
= V
ISENSE-
= 45V, V
ICTRL
= 1.40V, T
A
= T
J
= -40NC to +125NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
GATE DRIVER (NDRV)
Peak Pullup Current
Peak Pulldown Current
Rise Time
Fall Time
R
DSON
Pulldown nMOS
PWM DIMMING (PWMDIM)
ON Threshold
Hysteresis
Pullup Resistance
PWMDIM to LED Turn-Off Time
PWMDIM to LED Turn-On Time
pMOS GATE DRIVER (DIMOUT)
Peak Pullup Current
Peak Pulldown Current
DIMOUT
Low Voltage with
Respect to V
ISENSE+
OVERVOLTAGE PROTECTION (OVP)
Threshold
V
OVPOFF
Hysteresis
Input Leakage
V
OVPHY
I
LOVP
V
OVP
rising
V
OVP
= 1.235V
I
DIMOUTPU
I
DIMOUTPD
V
PWMDIM
= 0V,
V
ISENSE+
- V
DIMOUT
= 7V
V
ISENSE+
- V
DIMOUT
= 0V
25
10
-8.7
1.19
-300
285
298
8192
1
50
25
-7.4
1.225
70
+300
310
80
45
-6.3
1.26
mA
mA
V
V
mV
nA
mV
Clock
Cycles
Fs
SYMBOL
I
NDRVPU
I
NDRVPD
t
r
t
f
CONDITIONS
V
CC
= 7V, V
NDRV
= 0V
V
CC
= 7V, V
NDRV
= 7V
C
NDRV
= 10nF
C
NDRV
= 10nF
MIN
TYP
3
3
30
30
0.25
1.19
1.7
PWMDIM falling edge to rising edge on
DIMOUT,
C
DIMOUT
= 7nF
PWMDIM rising edge to falling edge on
DIMOUT,
C
DIMOUT
= 7nF
0.6
1.225
70
3
2
3
4.5
1.1
1.26
MAX
UNITS
A
A
ns
ns
I
V
mV
MI
Fs
Fs
R
NDRVON
V
PWMON
R
PWMPU
V
PWMHY
V
COMP
= 0V, I
SINK
= 100mA
SHORT-CIRCUIT HICCUP MODE (not present in the MAX16833G)
Short-Circuit Threshold
V
SHORT-HIC
(V
ISENSE+
- V
ISENSE-
) rising
Hiccup Time
Delay in Short-Circuit Hiccup
Activation
BUCK-BOOST SHORT-CIRCUIT DETECT
Buck-Boost Short-Circuit
V
SHORT-BB
Threshold
Delay in
FLT
Assertion from
Buck-Boost Short-Circuit
Condition
Delay in
FLT
Deassertion After
Buck-Boost Short Circuit is
Removed (Consecutive Clock-
Cycle Count)
t
DEL-BB-SHRT
t
HICCUP
(V
ISENSE+
- V
IN
) falling, V
IN
= 12V
Counter increments only when
V
PWMDIM
> V
PWMON
Counter increments only when
V
PWMDIM
> V
PWMON
1.15
1.55
8192
1.9
V
Clock
Cycles
Clock
Cycles
8192
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Maxim Integrated
│
4
MAX16833/MAX16833B/C/D/G
High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
Electrical Characteristics (continued)
(V
IN
= 12V, R
RT
= 12.4kI, C
IN
= C
VCC
= 1µF, C
LFRAMP
/C
REF
= 0.1µF, NDRV = COMP =
DIMOUT
= PWMDIM =
FLT
= unconnected,
V
OVP
= V
CS
= V
PGND
= V
SGND
= 0V, V
ISENSE+
= V
ISENSE-
= 45V, V
ICTRL
= 1.40V, T
A
= T
J
= -40NC to +125NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
OPEN-DRAIN FAULT (FLT)
Output Voltage Low
Output Leakage Current
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
Note 2:
All devices are 100% tested at T
A
= +25NC. Limits over temperature are guaranteed by design.
SYMBOL
V
OL-FLT
CONDITIONS
V
IN
= 4.75V, V
OVP
= 2V, and I
SINK
= 5mA
V
FLT
= 5V
Temperature rising
+160
10
MIN
TYP
40
MAX
200
1
UNITS
mV
FA
NC
NC
Typical Operating Characteristics
(V
IN
= +12V, C
VIN
= C
VCC
= 1FF, C
LFRAMP
/C
REF
= 0.1FF, T
A
= +25NC, unless otherwise noted.)
IN RISING/FALLING UVLO THRESHOLD
vs. TEMPERATURE
MAX16833 toc01
QUIESCENT CURRENT
vs. TEMPERATURE
MAX16833 toc02
QUIESCENT CURRENT vs. V
IN
V
PWMDIM
= 0V
V
IN
~ 4.6V
MAX16833 toc03
4.8
IN RISING/FALLING UVLO THRESHOLD (V)
4.7
4
2.5
2.0
1.5
1.0
0.5
0
V
PWMDIM
= 0V
QUIESCENT CURRENT (mA)
3
V
IN
RISING
4.6
4.5
4.4
4.3
4.2
-40
-15
10
35
60
85
2
V
IN
FALLING
1
0
110 125
-40
-15
10
35
60
85
110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
QUIESCENT CURRENT (mA)
1
10
V
IN
(V)
100
V
CC
vs. I
VCC
MAX16833 toc04
MAX16833 toc05
6.95
6.90
6.85
6.80
7.05
7.00
DIMOUT (WITH RESPECT TO ISENSE+) (V)
-6.7
-7.2
-7.7
-8.2
-8.7
V
CC
(V)
V
CC
(V)
6.95
6.90
6.85
6.80
6.75
0
5
10 15 20 25 30 35 40 45 50
I
VCC
(mA)
6.75
-40
-15
10
35
60
85
110 125
TEMPERATURE (°C)
-40
-15
10
35
60
85
110 125
TEMPERATURE (°C)
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Maxim Integrated
│
5
MAX16833 toc06
7.00
V
CC
vs. TEMPERATURE
7.10
-6.2
DIMOUT (WITH RESPECT TO ISENSE+)
vs. TEMPERATURE
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