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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V ON = V OVP = 3.6V, V PGND = V GND = 0V, COMP, CS, and LX are unconnected, T A = -40°C to +85°C, unless otherwise noted.
Typical values are at T A = +25°C.) (Note 1)
PARAMETER
Serial Dimming
Full-Scale LED Current Accuracy
PWM Frequency for PWM
Dimming Control
CS to COMP Transconductance
Soft-Start Interval
SYMBOL
f PWM
t SOFT-
START
CONDITIONS
T A = +25 ° C
I LED = 24.75mA
T A = -40 ° C to +85 ° C
(MAX8901B)
MAX8901A
C COMP = 0.022μF (Figure 1)
MIN
-1.3
-3
40
TYP
100
60
10
MAX
+1.3
+3
80
UNITS
%
%
kHz
μS
ms
Thermal Shutdown
OSCILLATOR
160
° C
Operating Frequency
f SW
700
750
800
kHz
Maximum Duty Cycle
D MAX
V CS = 0.4V
90
92
%
n-CHANNEL SWITCH
LX Leakage Current
n-Channel Switch On-Resistance
n-Channel Current Limit
I LXLKG
R LX
I LIM
V LX = 27V
T A = +25 ° C
T A = +85 ° C
0.63
0.1
0.1
0.7
0.70
5
1.4
0.77
μA
Ω
A
Note 1: Specifications to -40°C are guaranteed by design and characterization and are not production tested.
STEP
0
1
2
3
4
5
28
29
30
31
32
33
t HI_INIT
> 40 μ s
ON
t HI
t SOFT-START
FULL
32/33 31/33
t LO
500ns TO 500 μ s
30/33 29/33 28/33
> 500ns
FULL
t SHDN
32/33 1.33ms (typ)
I LED_
SHUTDOWN
6/33
5/33
4/33
3/33
2/33
1/33
SHUTDOWN
Figure 1. MAX8901B Timing Diagram
_______________________________________________________________________________________
3
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