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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 [(V BST - V LX_ ) + 0.3V]
DL to PGND................................................-0.3V to (V DD + 0.3V)
V CC to SGND............................................................-0.3V to +6V
V CC , V DD to PGND ...................................................-0.3V to +6V
SGND to PGND .....................................................-0.3V to +0.3V
Continuous Power Dissipation (T A = +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
All Other Pins to SGND...............................-0.3V to (V CC + 0.3V)
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
(V CC = 5V, V DD = V CC , T A = T J = T MIN to T MAX , unless otherwise noted. Typical specifications are at T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SYSTEM SPECIFICATIONS
7
28
Input Voltage Range
Quiescent Supply Current
V IN
I Q
Short IN and V CC together for 5V input
operation
EN = V CC or SGND, not switching
4.75
2.7
5.50
5.5
V
mA
LED CURRENT REGULATOR
SENSE+ to SENSE- Accuracy
(Note 2)
Soft-Start Time
t SS
No load, V IN = 4.75V to 5.5V, f SW = 500kHz
No load, V IN = 7V to 28V, f SW = 500kHz
0.594
0.594
0.6
0.6
1024
0.606
0.606
V
Clock
Cycles
STARTUP/INTERNAL REGULATO R
V CC Undervoltage Lockout
UVLO
V CC rising
4.1
4.3
4.5
V
V CC Undervoltage Hysteresis
200
mV
V CC Output Voltage
V IN = 7V to 28V, I SOURCE = 0 to 60mA
4.85
5.1
5.30
V
MOSFET DRIVERS
Output Driver Impedance
Output Driver Source/Sink Current
Nonoverlap Time
R ON
I DH ,I DL
t NO
Low or high output, I SOURCE/SINK = 20mA
C DH/DL = 5nF
1.1
4
35
3.0
?
A
ns
OSCILLATOR
Switching Frequency Range
125
1500
kHz
Switching Frequency
R T = 500k ?
121
125
129
Switching Frequency
Switching Frequency
Switching Frequency Accuracy
f SW
R T = 120k ?
R T = 39.9k ?
120k ? ≤ R T ≤ 500k ?
40k ? ≤ R T ≤ 120k ?
495
1515
-5
-8
521
1620
547
1725
+5
+8
kHz
%
2
_______________________________________________________________________________________
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