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High-Efficiency, 36V Step-Up Converters
with T A Derating Option for 2 to 9 White LEDs
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.0V, L = 22μH, C IN = 2.2μF, C OUT = 0.1μF, C COMP = 0.1μF, R SENSE = 13 ? , V CTRL = 1.5V, T A = -40°C to +85°C, unless other-
wise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
CS Derating Function Slope
CTRL Input Resistance
CTRL Dual-Mode Threshold
CONDITIONS
MAX8596X, V CTRL = 3.0V, T A = +42 ° C to +85 ° C
V CTRL < 1.5V
MIN
250
100
TYP
-5.5
500
170
MAX
780
240
UNITS
mV/ ° C
k ?
mV
CTRL Dual-Mode Hysteresis
5
mV
CTRL Shutdown Enable Delay
CS to COMP Transconductance
COMP Input Resistance to
Ground
(Note 3)
V COMP = 1.5V
In shutdown, UVLO or OVLO
6.0
32
8.2
50
20
10.5
82
ms
μS
k ?
OSCILLATOR
Operating Frequency
Minimum Duty Cycle
PWM mode
Pulse skipping
0.75
1.0
12
0
1.25
MHz
%
Maximum Duty Cycle
CTRL = IN, CS = GND
94
95
%
n-CHANNEL SWITCH
LX On-Resistance
I LX = 190mA
0.8
1.35
?
LX Leakage Current
LX Current Limit
V LX = 36V, CTRL = GND
Duty cycle = 90%
T A = +25 ° C
T A = +85 ° C
500
0.01
1
700
5
900
μA
mA
Note 1: Parameters are 100% production tested at T A = +25°C. Limits over the operating temperature range are regulated by
design and characterization.
Note 2: V D is the forward-voltage drop of the Schottky diode in Figure 1.
Note 3: Time from CTRL going below the Dual-Mode threshold to IC shutdown.
_______________________________________________________________________________________
3
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