ABRIDGED DATA SHEET
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MAX20078
Synchronous Buck,
High-Brightness LED Controller
The MAX20078 is a high-voltage, synchronous n-channel
MOSFET controller for high-current buck LED drivers. The
device uses a proprietary average current-mode-control
scheme to regulate the inductor current. This control
method does not need any control-loop compensation
while maintaining nearly constant switching frequency.
Inductor current sense is achieved by sensing the
current in the bottom synchronous n-channel MOSFET. It
does not require any current sense at high voltages. The
device operates over a wide 4.5V to 65V input range. The
device is designed for high-frequency operation and can
operate at switching frequencies as high as 1MHz. The
high- and low-side gate drivers have peak source and sink
current capability of 2A. The driver block also includes
a logic circuit that provides an adaptive nonoverlap time
to prevent shoot-through currents during transition. The
device includes both analog and PWM dimming. The
device includes a 5V V
CC
regulator capable of delivering
10mA to external circuitry. The device also includes a
current monitor that provides an analog voltage
proportional to the inductor current. The device has
a fault flag that indicates open and shorts across the
output. Protection features include inductor current-limit
protection, overvoltage protection, and thermal shutdown.
The MAX20078 is available in a space-saving (3mm x
3mm), 16-pin TQFN or a 16-pin TSSOP package and is
specified to operate over the -40°C to +125°C automotive
temperature range.
Ordering Information
appears at end of data sheet.
General Description
Benefits and Features
●
Automotive Ready: AEC-Q100 Qualified
●
Wide Input Voltage Range: 4.5V to 65V
●
Easy to Design
• No Compensation Components
• Programmable Switching Frequency
●
Wide Dimming Ratio Allows High Contrast Ratio
• Analog Dimming
• PWM Dimming
●
Suitable for Matrix Lighting
• Maintains Current Regulation While Shorting/
Opening Individual LEDs in the String
• Ultrafast-Response Control Loop Prevents
Overshoots and Undershoots
●
Fault Detection and Protection
• Overvoltage Protection
• Open and Short Detection
• Thermal Shutdown
• Inductor Current Monitor
●
Low-Power Shutdown Mode
Applications
●
●
●
●
Automotive Front Lights
Automotive Matrix Lights
Head-Up Displays
Constant-Current Regulators
Simplified Schematic
INPUT
C
IN
C
VCC
D1
V
CC
IN
BST
DH
Q1
C
BST
R1
MAX20078
TON
C1
PWM
LED CURRENT CONTROL
L1
C
OUT
DIM
REFI
DL
Q2
R2
LED1
LX
CSP
R3
FAULT FLAG
CURRENT MONITOR
FLT
IOUTV
PGND
AGND
CSN
OUT
R
CS
LEDn
19-8717; Rev 5; 4/19
ABRIDGED DATA SHEET
MAX20078
Synchronous Buck,
High-Brightness LED Controller
Chip Information
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP* (SW)
16 TQFN-EP* (SW)
16 TSSOP-EP*
16 TSSOP-EP*
Ordering Information
PART
MAX20078ATE+
MAX20078ATE/V+
MAX20078ATEY+
MAX20078ATE/VY+
MAX20078AUE+
MAX20078AUE/V+
TEMP
RANGE
-40ºC to
+125ºC
-40ºC to
+125ºC
-40ºC to
+125ºC
-40ºC to
+125ºC
-40ºC to
+125ºC
-40ºC to
+125ºC
PROCESS: CMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to
www.maximintegrated.com/packages.
Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
TQFN-EP
TQFN-EP (SW)
TSSOP-EP
PACKAGE
CODE
T1633+4C
T1633Y+4C
U16E+4C
OUTLINE
NO.
21-0136
21-100108
21-0108
LAND
PATTERN NO.
90-0031
90-100046
90-0446
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
(SW) = Side wettable.
*EP = Exposed pad.
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