EVALUATION KIT AVAILABLE
MAX20090
Automotive High-Voltage,
High-Brightness LED Controller
General Description
The MAX20090 is a single-channel high-brightness LED
(HB LED) driver for automotive front-light applications such
as high beam, low beam, daytime running lights (DRLs),
turn indicators, fog lights, and other LED lights. It can take
an input voltage from 5V to 65V and drive a string of LEDs
with a maximum output voltage of 65V.
The device senses output current at the high side of the
LED string. High-side current sensing is required to pro-
tect for shorts from the output to the ground or battery
input. It is also the most flexible scheme for driving LEDs,
allowing boost, high-side buck, SEPIC mode, or buck-
boost-mode configurations. The PWM input provides LED
dimming ratios of up to 1000:1, and the ICTRL input provides
additional analog dimming capability in the controller. The
device also includes a fault flag (FLT) that indicates open
string, shorted string, and thermal shutdown. The device
has built-in spread-spectrum modulation for improved
electromagnetic-compatibility performance. The device
can also be used in zeta and Cuk converter configura-
tions, if necessary in some applications. The MAX20090 is
available in a space-saving (4mm x 4mm), 20-pin TQFN,
20-pin side-wettable TQFN, or a 20-pin TSSOP pack-
age and is specified to operate over the -40°C to +125°C
automotive temperature range
Benefits and Features
●
High-Brightness LED Driver with a Wide Input Range
Saves Space and Cost Through Integration
• +5V to +65V Wide Input Voltage Range
• +65V Maximum Boost Output Voltage
• ICTRL Pin for Analog Dimming
•
Integrated High-Side Current-Sense Amplifier
•
200Hz On-Board Ramp Simplifies PWM Dimming
●
Flexible Architecture Enables Easy Design
Optimization
•
Configurable as Boost, High-Side Buck, SEPIC,
Buck-Boost, Zeta, and Cuk
• Programmable Switching Frequency (200kHz to
2.2MHz)
• Spread-Spectrum Modulation to Reduce EMI Noise
●
Automotive Features and Robustness Improve
System Reliability
• Fault Diagnosis Through Fault Flag
• Short Circuit, Overvoltage, and Thermal Protection
• -40°C to +125°C Operating Temperature Range
Simplified Typical Operating Circuit
L1
INPUT
IN
C
IN
R3
UVEN
PWMDIM
PWMDIM
R
RT
RT
C2
R4
V7V
C1
V
CC
ANALOG DIM
ICTRL
SGND
EP PGND
MAX20090
BST
NDRV
CS
OVP
ISENSE+
ISENSE-
100Ω
DIMOUT
FLT
COMP
R
COMP
C
COMP
R
CS_FET
R
OVP2
P1
R
SC
R
CS_LED
C
BST
N1
D1
R
OVP1
Applications
●
●
●
●
●
●
Automotive Exterior Lighting
High-Beam/Low-Beam/Signal/Position Lights
Daytime Running Lights (DRLs)
Fog Lights and Adaptive Front-Light Assemblies
Head-Up Displays
Commercial, Industrial, and Architectural Lighting
C
OUT
Ordering Information
appears at end of data sheet.
19-8747; Rev 3; 4/18
MAX20090
Automotive High-Voltage,
High-Brightness LED Controller
Simplified Schematic
INPUT
L1
D1
IN
C
IN
BST
NDRV
CS
UVEN
OVP
ISENSE+
ISENSE-
100Ω
DIMOUT
FLT
R
CS_FET
COMP
R
OVP2
P1
R
SC
R
CS_LED
C
BST
C
OUT
N1
R
OVP1
R3
PWMDIM
R
RT
R4
C2
PWMDIM
RT
MAX20090
V7V
C1
V
CC
R1
R
COMP
ICTRL
R2
SGND
PGND
EP
C
COMP
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MAX20090
Automotive High-Voltage,
High-Brightness LED Controller
Absolute Maximum Ratings
IN to PGND ...........................................................-0.3V to +70V
ISENSE+, ISENSE-,
DIMOUT
to PGND ...............-0.3V to +70V
DIMOUT
to ISENSE+ ...........................................-8.5V to +0.3V
ISENSE- to ISENSE+...........................................-0.3V to +0.3V
PGND to SGND....................................................-0.6V to +0.3V
V
CC
, UVEN to PGND ..............................................-0.3V to +6V
V7V to PGND ..........................................................-0.3V to +9V
BST to PGND .................................................-0.3V to V7V + 5V
BST to NDRV ..........................................................-0.3V to +6V
NDRV to PGND ....................................................-0.3V to +7.3V
OVP, PWMDIM, ICTRL,
FLT
to PGND....................-0.3V to +6V
COMP, RT, CS to PGND ...................................... -0.3V to +V
CC
Continuous Current on IN ................................................100mA
Peak Current on NDRV .........................................................+2A
Continuous Current on NDRV ..........................................+50mA
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
20-pin TSSOP
(derate 26.1mW/°C above +70°C) ...........................2089 mW
20-pin TQFN
(derate 25.6mW/°C above +70°C) ............................2051mW
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
Soldering Temperature (reflow) .......................................+260°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.
Package Thermal Characteristics
(Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........37°C/W
Junction-to-Case Thermal Resistance (θ
JC
) .................2°C/W
TQFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ..........33°C/W
Junction-to-Case Thermal Resistance (θ
JC
) .................2°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
= 85.4kΩ, C
IN
= C
VCC
= 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
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
SUPPLY VOLTAGE
Input Voltage Range
Supply Current
UNDERVOLTAGE LOCKOUT
Undervoltage-Lockout Rising
Hysteresis
Shutdown Current
V
CC
REGULATOR
Output Voltage
Dropout Voltage
V
CC
UVLO Rising
Hysteresis
V
CC
V
CC DROP
V
CC UVLOR
Load 0.1mA to 15mA,
6.0V < V
IN
< 16V
V
IN
= 4.5V, I
VCC
= 5mA
Rising
4.875
5
0.07
4.0
0.4
5.125
0.16
V
V
V
V
I
SHTDN
V
UVEN
= 0V, V
IN
= 12V
V
UVEN_THUP
V
UVEN
rising
1.12
1.24
106
15
26
1.37
V
mV
μA
V
IN
I
INQ
V
OVP
= 1.5V, no switching
5.0
1.8
65
5.0
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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MAX20090
Automotive High-Voltage,
High-Brightness LED Controller
Electrical Characteristics (continued)
V
IN
= 12V, R
RT
= 85.4kΩ, C
IN
= C
VCC
= 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
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
V7V REGULATOR
0.1mA ≤ I
VCC
≤ 50mA, 9V ≤
V
IN
≤ 12V
12V ≤ V
IN
≤ 65V, I
VCC
= 10mA
Dropout Voltage
V7V UVLO Rising
Hysteresis
Short-Circuit Current Limit
BOOTSTRAP SUPPLY
BST Input Current
OSCILLATOR (RT)
Switching-Frequency Range
Bias Voltage at RT
Minimum Off-Time
Oscillator Frequency Accuracy
Frequency Dither
SLOPE COMPENSATION
Slope-Compensation Current-Ramp
Height
ANALOG DIMMING
ICTRL Input Control-Voltage Range
ICTRL Zero-Current Threshold
ICTRL Clamp Voltage
ICTRL Input Bias Current
LED CURRENT-SENSE AMPLIFIER
Common-Mode Input Range
Differential Signal Range
IB
ISENSE+
IB
ISENSE-
V
ISENSE+
- V
ISENSE-
= 200mV,
V
ISENSE+
= 60V
V
ISENSE+
- V
ISENSE-
= 200mV,
V
ISENSE+
= 60V
T
J
= +25°C, V
ISENSE+
,
V
ISENSE-
= 3V to 60V
3V < V
ISENSE+
, V
ISENSE-
< 60V
-0.2
0
350
22
-0.1
-0.1
+65
225
550
μA
60
V
mV
ICTRL
RNG
ICTRL
ZC_VTH
ICTRLCLMP
ICTRLI
IN
(V
ISENSE+
- V
ISENSE-
) < 5mV
ICTRL sink = 1μA
V
ICTRL
= 0 to 5.5V
0.2
0.16
1.25
0.18
1.30
20
1.2
0.200
1.35
500
V
V
V
nA
I
SLOPE
Peak current ramp added to CS
input per switching cycle
42.5
50
57.5
μA
f
DITH
f
SW
V
RT
t
OFF_MIN
V
COMP
= high, V
CS
= 0V
Dither disabled
Dither enabled, f
SW
= 200kHz to
2.2MHz
-10
±6
200
1.25
85
+10
2200
kHz
V
ns
%
%
I
BST_OFF
0.02
mA
I
V7VSC
V
7V
shorted to GND, V
IN
= 5V
55
VDO7V
V7VUVLOR
V
IN
= 5.0V, I
V7V
= 50mA
Rising
6.72
6.72
7.0
7.0
0.175
4.33
0.36
7.28
V
7.28
0.42
4.7
V
V
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage
V7V
I
SENSE+/-
Input Bias Current
Input Offset Voltage
mV
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MAX20090
Automotive High-Voltage,
High-Brightness LED Controller
Electrical Characteristics (continued)
V
IN
= 12V, R
RT
= 85.4kΩ, C
IN
= C
VCC
= 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
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Voltage Gain
SYMBOL
CONDITIONS
(V
ISENSE+
- V
ISENSE-
) = 200mV,
3V < V
ISENSE+
, V
ISENSE-
< 60V
V
SENSE
V
ICTRL
= 1.3V,
3V < (V
ISENSE+
- V
ISENSE-
) < 60V
V
ICTRL
= 1.2V,
3V < (V
ISENSE+
- V
ISENSE-) < 60V
V
ICTRL
= 0.4V,
3V < (V
ISENSE+
- V
ISENSE-)
< 60V
LED Current-Sense Regulation
Voltage (Low Range)
V
ICTRL
= 1.2V,
0V < (V
ISENSE+
- V
ISENSE-)
< 3V
V
ICTRL
= 0.4V,
0V < (V
ISENSE+
- V
ISENSE-)
< 3V
Common-Mode Input Range
Selector
ERROR AMP
Transconductance
COMP Sink Current
COMP Source Current
PWM COMPARATOR
Input Offset Voltage
PWM-to-NDRV Propagation Delay
CS LIMIT COMPARATOR
Current-Limit Threshold
GATE DRIVER (NDRV)
R
DS(ON)
Pullup pMOS
R
DS(ON)
Pulldown nMOS
Rise Time
Fall Time
PWM DIMMING
Internal Ramp Frequency
External Sync-Frequency Range
External Sync Low-Level Voltage
External Sync High-Level Voltage
DIM Comparator Offset Voltage
DIM Voltage for 100% Duty Cycle
f
RAMP
f
DIM
V
LTH
V
HTH
V
DIMOFS
2
170
3.3
200
230
160
60
200
240
2000
0.4
Hz
Hz
V
V
mV
V
R
NDRVON
R
NDRVOFF
t
R
t
F
V
COMP
= 0V, I
SINK
= 100mA
C
NDRV
= 10nF
C
NDRV
= 10nF
0.3
0.3
0.6
0.6
40
40
1.3
1.3
Ω
Ω
ns
ns
V
CS_LIMIT
388
418
448
mV
Includes leading-edge blanking
time
1
90
V
ns
g
M
COMPI
SINK
COMP
ISRC
V
ISENSE+
- V
ISENSE-
= 200mV
V
COMP
= 5V
V
COMP
= 0V
1170
1800
300
300
2430
μS
μA
μA
RNG
SEL
V
ISENSE+
rising
V
ISENSE+
falling
MIN
4.90
213.8
194.0
37.0
192
35
2.72
2.48
TYP
5.0
220
200
40
200
40
2.85
2.6
MAX
5.1
226.2
mV
206.0
43.0
208
45
2.98
2.72
V
mV
UNITS
V/V
LED Current-Sense Regulation
Voltage
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