Simple sot23 boost controllers – Rainbow Electronics MAX1524 User Manual
Page 2
Simple SOT23 Boost Controllers
2
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= SHDN = 3.3V, SET = GND , T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:
Actual startup voltage is dependent on the external MOSFET’s V
GS(TH)
.
Note 2:
Specification applies after soft-start mode is completed.
V
CC
, FB, SHDN, SET to GND ...................................-0.3V to +6V
EXT to GND ................................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Operating Voltage Range
2.5
5.5
V
MAX1522/MAX1523
2.5
V
CC
Minimum Startup Voltage
f
EXT
> 100kHz, MAX1524 (Note 1), bootstrap required
1.5
V
V
CC
rising
2.37
2.47
Undervoltage Lockout
Threshold
V
CC
falling
2.20
2.30
V
V
CC
Supply Current
No load, nonbootstrapped
25
50
µA
V
CC
Shutdown Current
SHDN = GND
0.001
1
µA
SET = GND
0.4
0.5
0.6
Fixed t
ON
Time
V
FB
=1.2V
SET = V
CC
2.4
3.0
3.6
µs
V
FB
> 0.675V
0.5
Minimum t
OFF
Time
V
FB
< 0.525V
1.0
µs
SET = GND
45
50
55
Maximum Duty Factor
SET = V
CC
80
85
90
%
FB Regulation Threshold
(Note 2)
V
CC
= +2.5V to +5.5V
1.23
1.25
1.27
V
FB Undervoltage Fault
Threshold (Note 2)
FB falling
525
575
625
mV
FB Input Bias Current
V
FB
= 1.3V
6
50
nA
EXT high
2
4
EXT Resistance
I
EXT
= 20mA
EXT low
1.5
3
Ω
Soft-Start Ramp Time
2.2
3.2
4.2
ms
Logic Input High
V
CC
= +2.5V to +5.5V, SET, SHDN
1.6
V
Logic Input Low
V
CC
= +2.5V to +5.5V, SET, SHDN
0.4
V
Logic Input Leakage Current
SET, SHDN = V
CC
or GND
-1
+1
µA
MAX1522/MAX1523/MAX1524