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MAX16826
Programmable, Four-String HB LED Driver with
Output-Voltage Optimization and Fault Detection
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 12V, R19 = 2k Ω , C33 = 2200pF, R17 = 1.27k Ω , C DL_ = 0.01μF, 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
ERROR AMPLIFIER (FB, COMP)
Open-Loop Gain
Unity-Gain Bandwidth
Phase Margin
A OL
BW
PM
80
2
65
dB
MHz
Degrees
Error-Amplifier Output Current
I COMP
Sourcing, V COMP = 3V
Sinking, V COMP = 2V
1.9
0.9
mA
COMP Clamp Voltage
COMP Short-Circuit Current
V COMP
I COMP_SC
V FB = 0V
3.25
12
4.5
V
mA
PWM CURRENT LIMIT (CS)
Cycle-by-Cycle Current-Limit
Threshold
Cycle-by-Cycle Current-Limit
Propagation Time To DL
Gross Current-Limit Threshold
Gross Current-Limit Propagation
Time To DL
Input Bias Current
V CL
t PROP, CL
V GCL
t PROP,GCL
V DL = 0V
10mV overdrive
V CSS = 0V
10mV overdrive
0V < V CS < 5.5V
187
250
-100
200
80
270
80
0
217
280
+100
mV
ns
mV
ns
nA
PWM OSCILLATOR (RTCT)
RTCT Voltage Ramp (Peak to
Peak)
RTCT Voltage Ramp Valley
Discharge Current
Frequency Range
V RAMP
V RAMP_VALLEY
I DIS
f OSC
5.5V < V IN < 24V
5.5V < V IN < 24V
V RTCT = 2V
5.5V < V IN < 24V
1.60
1.11
7.8
100
1.65
1.20
8.4
1.80
1.27
9.1
1000
V
V
mA
kHz
SYNCHRONIZATION (SYNC/ENABLE)
Input Rise/Fall Time
200
ns
Input Frequency Range
100
1000
kHz
Input High Voltage
Input Low Voltage
Input Minimum Pulse Width
1.5
200
0.5
V
V
ns
Input Bias Current
Delay to Shutdown
0V < V SYNC < 5.5V
V SYNC = 0V
-100
13
0
32
+100
65
nA
μs
LED DIMMING (DIM1–DIM4)
Input High Voltage
Input Low Voltage
V DIM,MAX
V DIM,MIN
1.5
0.5
V
V
Minimum Dimming Frequency
f DIM
t ON = 2μs (Note 3)
45
Hz
Input Bias Current
I DIM
0V < V DIM_ < 5.5V
-100
0
+100
nA
4
Maxim Integrated
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