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High-Efficiency Step-Up
Current Regulator for LEDs
ELECTRICAL CHARACTERISTICS
(V CC = +3.3V, T A = -40°C to +85°C , unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
Supply Voltage
Quiescent Supply Current
V CC
I CC
V FB = 0.3V
2.7
5.5
500
V
μA
Undervoltage Lockout
Rising edge
2.20
2.65
V
FB Regulation Voltage
V FB
ADJ = REF
V ADJ = 100mV
280
13
320
35
mV
CS Trip Current
FB = GND
MAX1698A
MAX1698
2.0
0.8
3.0
3.0
A
Minimum Off Time
Maximum On Time
ADJ Start Threshold
FB Input Bias Current
ADJ Input Bias Current
Shutdown Supply Current
REF Output Voltage
REF Load Regulation
REF Short-Circuit Current
REF Power-Supply Rejection
Ratio
EXT On-Resistance
t OFF(MIN)
t ON(MAX)
I FB
I ADJ
V REF
? V REF
PSRR
FB = GND, ADJ = REF
FB = GND, ADJ = REF, CS = GND
V FB = 300mV
ADJ = REF
SHDN = GND
I REF = 0
I REF = 0 to 150μA
REF = GND
V CC = 2.7V to 5.5V
V CC = 5V
0.6
9
25
-20
-50
1.17
1.4
21
75
20
50
1
1.33
-30
1
+2
8
μs
μs
mV
nA
nA
μA
V
mV
mA
mV/V
?
SHDN Input High Voltage
SHDN Input Low Voltage
V IH
V IL
V CC = 2.7V to 5.5V
V CC = 2.7V to 5.5V
2
0.8
V
V
SHDN Input Bias Current
I SHDN
V CC = 2.7V to 5.5V
-1
1
μA
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
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