MAX16821A Datasheet, PDF (2/25 Pages) Maxim Integrated Products – High-Power Synchronous HBLED Drivers with Rapid Current Pulsing

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
V_CC Current ......................................................................300mA
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
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
Input-Voltage Range
Quiescent Supply Current
LED CURRENT REGULATOR
SYMBOL
V_IN
I_Q
CONDITIONS
Internal LDO on
Internal LDO off (V_CC connected to V_IN)
V_EN = V_CC or SGND, no switching
MIN TYP MAX
7
28
4.75
5.50
2.7
5.5
V_IN = V_CC = 4.75V to 5.5V, f_SW = 500kHz
(MAX16821A)
0.594 0.600 0.606
V_IN = 7V to 28V, f_SW = 500kHz
(MAX16821A)
0.594 0.600 0.606
Differential Set Value
(V_SENSE+ to V_SENSE-) (Note 2)
V_IN = V_CC = 4.75V to 5.5V, f_SW = 500kHz
(MAX16821B)
V_IN = 7V to 28V, f_SW = 500kHz
(MAX16821B)
0.098 0.100 0.102
0.098 0.100 0.102
V_IN = V_CC = 4.75V to 5.5V, f_SW = 500kHz _{0.028 0.030 0.032}
(MAX16821C)
V_IN = 7V to 28V, f_SW = 500kHz
(MAX16821C)
0.028 0.030 0.032
Soft-Start Time
t_SS
1024
STARTUP/INTERNAL REGULATOR
V_CC Undervoltage Lockout (UVLO)
UVLO
V_CC rising
4.1
4.3
4.5
UVLO Hysteresis
V_CC falling
200
V_CC Output Voltage
MOSFET DRIVER
V_IN = 7V to 28V, I_SOURCE = 0 to 60mA
4.85 5.10 5.30
Output Driver Impedance
Low or high output, I_SOURCE/SINK = 20mA
1.1
3
Output Driver Source/Sink Current I_DH, I_DL
4
Nonoverlap Time
t_NO
C_DH/DL = 5nF
35
UNITS
V
mA
V
Clock
Cycles
V
mV
V
Ω
A
ns
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