MAX16818ETI 반도체 회로 부품 판매점
LED Driver
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 Maxim Integrated |
MAX16818
EVALUATION KIT AVAILABLE
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
General Description
The MAX16818 pulse-width modulation (PWM)
LED driver controller provides high-output-current
capability in a compact package with a minimum number
of external components. The MAX16818 is suitable for
use in synchronous and nonsynchronous step-down
(buck) topologies, as well as in boost, buck-boost, SEPIC,
and Cuk LED drivers. The MAX16818 is the first LED
driver controller that enables Maxim’s technology for
fast LED current transients of up to 20A/µs and 30kHz
dimming frequency.
This device utilizes average-current-mode control that
enables optimal use of MOSFETs with optimal charge and
on-resistance characteristics. This results in the minimized
need for external heatsinking even when delivering up
to 30A of LED current. True differential sensing enables
accurate control of the LED current. A wide dimming range
is easily implemented to accommodate an external PWM
signal. An internal regulator enables operation over a wide
input voltage range: 4.75V to 5.5V or 7V to 28V and above
with a simple external biasing device. The wide switching
frequency range, up to 1.5MHz, allows for the use of small
inductors and capacitors.
The MAX16818 features a clock output with 180° phase
delay to control a second out-of-phase LED driver to
reduce input and output filter capacitors size or to mini-
mize ripple currents. The MAX16818 offers programmable
hiccup, overvoltage, and overtemperature protection.
The MAX16818ETI+ is rated for the extended tempera-
ture range (-40°C to +85°C) and the MAX16818ATI+ is
rated for the automotive temperature range (-40°C to
+125°C). This LED driver controller is available in a lead-
free, 0.8mm high, 5mm x 5mm 28-pin TQFN package with
an exposed pad.
Applications
●● Front Projectors/Rear Projection TVs
●● Portable and Pocket Projectors
●● LCD TVs and Display Backlight
Package Information appears at end of data sheet.
Benefits and Features
●● Flexible Architecture Supports a Range of LED
LIghting Applications with Minimal Component Count
• Up to 30A Output Current
• 4.75V to 5.5V or 7V to 28V Input Voltage Range
• Average-Current-Mode Control
• True-Differential Remote-Sense Input
●● Frequency Management Reduces EMI and
Interference with Other System Clocks
• Programmable Switching Frequency or External
Synchronization from 125kHz to 1.5MHz
• Clock Output for 180° Out-of-Phase Operation
●● Integrated Protection Features and Thermally
Enhanced Package Improve System Reliability
• Output Overvoltage and Hiccup-Mode Overcurrent
Protection
• Thermal Shutdown
• Thermally Enhanced 28-Pin TQFN Package
Ordering Information
PART
MAX16818ATI+
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
28 TQFN-EP*
MAX16818ETI+
-40°C to +85°C
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Diagram
7V TO 28V
IN
EN
ILIM
Q1
DH
MAX16818
Q2
DL
OVI CSP
CLP PGND
C1
VLED
L1
C2
Q3
R1
HIGH-FREQUENCY
PULSE TRAIN
NOTE: MAXIM TOPOLOGY
19-0666; Rev 4; 5/15
MAX16818
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
Absolute Maximum Ratings
IN to SGND............................................................-0.3V to +30V
BST to SGND.........................................................-0.3V to +35V
BST to LX.................................................................-0.3V to +6V
DH to LX..................................... -0.3V to [(VBST - VLX_) + 0.3V]
DL to PGND.............................................. -0.3V to (VDD + 0.3V)
VCC to SGND...........................................................-0.3V to +6V
VCC, VDD to PGND..................................................-0.3V to +6V
SGND to PGND.....................................................-0.3V to +0.3V
All Other Pins to SGND............................. -0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
28-Pin TQFN (derate 34.5mW/°C above +70°C).......2758mW
Operating Temperature Range
MAX16818ATI+............................................ .-40°C to +125°C
MAX16818ETI+............................................... -40°C to +85°C
Maximum Junction Temperature......................................+150°C
Storage Temperature Range............................. -60°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°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.
Electrical Characteristics
(VCC = 5V, VDD = VCC, TA = TJ = TMIN to TMAX, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 1)
PARAMETER
SYSTEM SPECIFICATIONS
SYMBOL
Input Voltage Range
VIN
Quiescent Supply Current
LED CURRENT REGULATOR
SENSE+ to SENSE- Accuracy
(Note 2)
IQ
Soft-Start Time
tSS
STARTUP/INTERNAL REGULATOR
VCC Undervoltage Lockout
VCC Undervoltage Hysteresis
VCC Output Voltage
UVLO
MOSFET DRIVERS
Output Driver Impedance
Output Driver Source/Sink Current
Nonoverlap Time
RON
IDH,IDL
tNO
OSCILLATOR
Switching Frequency Range
Switching Frequency
Switching Frequency
Switching Frequency
fSW
Switching Frequency Accuracy
CONDITIONS
MIN
Short IN and VCC together for 5V input
operation
EN = VCC or SGND, not switching
7
4.75
No load, VIN = 4.75V to 5.5V, fSW = 500kHz 0.594
No load, VIN = 7V to 28V, fSW = 500kHz
0.594
VCC rising
4.1
VIN = 7V to 28V, ISOURCE = 0 to 60mA
4.85
Low or high output, ISOURCE/SINK = 20mA
CDH/DL = 5nF
RT = 500kW
RT = 120kW
RT = 39.9kW
120kW ≤ RT ≤ 500kW
40kW ≤ RT ≤ 120kW
125
121
495
1515
-5
-8
TYP
2.7
0.6
0.6
1024
4.3
200
5.1
1.1
4
35
125
521
1620
MAX
28
5.50
5.5
0.606
0.606
4.5
5.30
3.0
1500
129
547
1725
+5
+8
UNITS
V
mA
V
Clock
Cycles
V
mV
V
W
A
ns
kHz
kHz
%
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MAX16818ETI driver
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