High-Power Synchronous HBLED
Drivers with Rapid 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
All Other Pins to SGND...............................-0.3V to (V CC + 0.3V)
Continuous Power Dissipation (T A = +70°C)
28-Pin TQFN 5mm x 5mm (derate 34.5mW/°C
above +70°C) ............................................................2758mW
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
V CC Current ......................................................................300mA
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 = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input-Voltage Range
Quiescent Supply Current
V IN
I Q
Internal LDO on
Internal LDO off (V CC connected to V IN )
V EN = V CC or SGND, no switching
7
4.75
2.7
28
5.50
5.5
V
mA
LED CURRENT REGULATOR
V IN = V CC = 4.75V to 5.5V, f SW = 500kHz
(MAX16821A)
V IN = 7V to 28V, f SW = 500kHz
(MAX16821A)
0.594
0.594
0.600
0.600
0.606
0.606
Differential Set Value
(V SENSE + to V SENSE- ) (Note 2)
Soft-Start Time
t SS
V IN = V CC = 4.75V to 5.5V, f SW = 500kHz
(MAX16821B)
V IN = 7V to 28V, f SW = 500kHz
(MAX16821B)
V IN = V CC = 4.75V to 5.5V, f SW = 500kHz
(MAX16821C)
V IN = 7V to 28V, f SW = 500kHz
(MAX16821C)
0.098
0.098
0.028
0.028
0.100
0.100
0.030
0.030
1024
0.102
0.102
0.032
0.032
V
Clock
Cycles
STARTUP/INTERNAL REGULATOR
V CC Undervoltage Lockout (UVLO)
UVLO
V CC rising
4.1
4.3
4.5
V
UVLO Hysteresis
V CC falling
200
mV
V CC Output Voltage
V IN = 7V to 28V, I SOURCE = 0 to 60mA
4.85
5.10
5.30
V
MOSFET DRIVER
Output Driver Impedance
Output Driver Source/Sink Current
I DH , I DL
Low or high output, I SOURCE/SINK = 20mA
1.1
4
3
?
A
Nonoverlap Time
t NO
C DH/DL = 5nF
35
ns
2
_______________________________________________________________________________________
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相关代理商/技术参数
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