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
PARAMETER
Input-Voltage Range
Quiescent Supply Current
LED CURRENT REGULATOR
(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)
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
V
IN
= V
CC
= 4.75V to 5.5V, f
SW
= 500kHz
(MAX16821A)
V
IN
= 7V to 28V, f
SW
= 500kHz
(MAX16821A)
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)
V
IN
= V
CC
= 4.75V to 5.5V,
f
SW
= 500kHz (MAX16821C)
V
IN
= 7V to 28V, f
SW
= 500kHz
(MAX16821C)
Soft-Start Time
STARTUP/INTERNAL REGULATOR
V
CC
Undervoltage Lockout
(UVLO)
UVLO Hysteresis
V
CC
Output Voltage
MOSFET DRIVER
Output Driver Impedance
Output Driver Source/Sink
Current
Nonoverlap Time
I
DH
, I
DL
t
NO
C
DH/DL
= 5nF
UVLO
V
CC
rising
V
CC
falling
V
IN
= 7V to 28V, I
SOURCE
= 0 to 60mA
Low or high output, I
SOURCE/SINK
= 20mA
4.85
4.1
4.3
200
5.10
1.1
4
35
5.30
3
4.5
V
mV
V
Ω
A
ns
t
SS
0.594
0.594
0.098
0.098
0.028
0.028
MIN
7
4.75
2.7
TYP
MAX
28
5.50
5.5
V
mA
UNITS
0.600
0.600
0.100
0.100
0.030
0.030
1024
0.606
0.606
0.102
V
0.102
0.032
0.032
Clock
Cycles
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Maxim Integrated
│
2
MAX16821A/MAX16821B/
MAX16821C
Electrical Characteristics (continued)
PARAMETER
OSCILLATOR
Switching Frequency Range
R
T
= 500kΩ
Switching Frequency
f
SW
R
T
= 120kΩ
R
T
= 39.9kΩ
Switching Frequency Accuracy
CLKOUT Phase Shift with
Respect to DH (Rising Edges)
CLKOUT Phase Shift with
Respect to DL (Rising Edges)
CLKOUT Output-Voltage Low
CLKOUT Output-Voltage High
SYNC Input High Pulse Width
SYNC Input Clock High
Threshold
SYNC Input Clock Low
Threshold
SYNC Pullup Current
SYNC Power-Off Level
INDUCTOR CURRENT LIMIT
Average Current-Limit Threshold
Reverse Current-Limit Threshold
Cycle-by-Cycle Current Limit
Cycle-by-Cycle Overload
CURRENT-SENSE AMPLIFIER
CSP to CSN Input Resistance
Common-Mode Range
Input Offset Voltage
Amplifier Voltage Gain
3dB Bandwidth
Transconductance
Open-Loop Gain
R
CS
V
CMR(CS)
V
OS(CS)
A
V(CS)
f
3dB
g
m
A
VL(CE)
V
IN
= 7V to 28V
V
CLR
V
CL
CSP to CSN
CSP to CSN
CSP to CSN
V
CSP
to V
CSN
= 75mV
V
OL
V
OH
t
SYNC
V
SYNCH
V
SYNCL
I
SYNC_
OUT
OFF
High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
(V
CC
= 5V, V
DD
= V
CC
, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
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