MAX16838
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V EN = 12V, R RT = 12.2k I , R ISET = 15k I , C VCC = 1 F F, V CC = V DRV = V CFB , DRAIN, COMP, OUT_, FLT = unconnected, V OV
= V CS = V LEDGND = V DIM = V PGND = V SGND = 0V, V GATE = V NDRV , T A = T J = -40 N C to +125 N C, unless otherwise noted. Typical
values are at T A = 25 N C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RT OSCILLATOR
Switching Frequency Range
f SW
200
2000
kHz
Duty Cycle
Oscillator Frequency Accuracy
Synchronization Logic-High
D MAX
f SW = 200kHz
f SW = 2000kHz
f SW = 200kHz to 2MHz
V RT rising
87
83
-7.5
1.8
90
85
95
91
+7.5
3.6
%
%
%
V
Synchronization Logic-Low
Logic-Level Before SYNC
Capacitor
Synchronization Pulse Width
V RT falling
3.1
50
2.5
3.8
V
V
ns
SYNC Frequency Range
f SYNC
1.1 x
f SW
1.5 x
f SW
Hz
PWM COMPARATOR
Leading-Edge Blanking
66
ns
Propagation Delay to NDRV
Including leading-edge blanking time
100
ns
SLOPE COMPENSATION
Slope Compensation Peak
Voltage per Cycle
Voltage ramp added to CS
0.12
V
CS LIMIT COMPARATOR
CS Threshold Voltage
V CS_MAX
V COMP = 3V
285
300
315
mV
CS Limit Comparator Propagation
Delay to NDRV
10mV overdrive (including leading-edge
blanking time)
100
ns
CS Input Current
I CS
0 P V CS P 0.35V
-1.3
+0.5
F A
ERROR AMPLIFIER
OUT_ Regulation Voltage
Transconductance
No-Load Gain
Gm
A
V DIM = 5V
(Note 4)
0.9
340
1
600
50
1.1
880
V
F S
dB
COMP Sink Current
COMP Source Current
I SINK
I SOURCE
V DIM = V OUT_ = 5V, V COMP = 3V
V DIM = 5V, V OUT_ = V COMP = 0V
400
400
800
800
F A
F A
MOSFET DRIVER
NDRV On-Resistance
Peak Sink Current
Peak Source Current
I SINK = 100mA, V IN > 5.5V
I SOURCE = 100mA, V IN > 5.5V
V NDRV = 5V
V NDRV = 0V
1.5
1.5
0.8
0.8
4
4
I
I
A
A
POWER MOSFET
Power Switch On-Resistance
Switch Leakage Current
Switch Gate Charge
I SWITCH = 0.5A, V GS = 5V
V DRAIN = 40V, V GATE = 0V
V DRAIN = 40V, V GS = 4.5V
0.15
0.003
3.1
0.35
1.2
I
F A
nC
Maxim Integrated
3
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