
A4402
Constant On-Time Buck Converter
With Integrated Linear Regulator
ELECTRICAL CHARACTERISTICS 1 (continued) valid for Temperature Range E version at T J = 25°C and for Temperature
Range K version at T J = –40°C to 150°C, V IN1 = 6 to 50 V (unless otherwise noted)
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Timing Circuitry
TSET Current, Watchdog Mode
TSET Valley Voltage, Watchdog Mode
TSET Reset Voltage, Watchdog Mode
WDI Frequency
WDI Duty Cycle
WDI Logic Input
WDI Logic Input Current 2
WDI Input Hysteresis
TSET Current, Soft Start Mode
POR Current
I TSETWDI
V TRIP
V RESET
f WDI
DC WDI
V WDI(0)
I WDI
V WDIHYS
I TSETSS
I POR
NPOR = high
V WDI = 0 to 5 V
NPOR = low
7
–
–
–
10
V IN2 ×
0.55
–20
–
14
3.92
10
1.2
0.48
–
–
–
< 1.0
300
20
5.60
14
–
–
100
90
–
20
–
26
7.28
μA
V
V
kHz
%
V
μA
mV
μA
μA
1 Temperature Range E version tested at T J = 25°C with performance from –40°C to 85°C guaranteed by design and characterization.
2 For input and output current specifications, negative current is defined as coming out of (sourcing) the specified pin.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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