A4447 Просмотр технического описания (PDF) - Allegro MicroSystems
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A4447 Datasheet PDF : 9 Pages
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A4447
High Voltage Step Down Regulator
ELECTRICAL CHARACTERISTICS1,2 at TA = 25°C, VIN = 8 to 50 V (unless noted otherwise)
Characteristics
Symbol
Test Conditions
Min.
VENB = LOW, IOUT = 0 mA, VIN = 42 V,
VBIAS = VOUT
–
VIN Quiescent Current3
IVIN(Q)
VENB = LOW, IOUT = 0 mA, VIN = 42 V,
VBIAS < 3 V
–
VENB = HIGH
–
VBIAS Input Current
IBIAS
VBIAS = VOUT
–
Buck Switch On Resistance
RDS(on)
TA = 25°C, IOUT = 2 A
TA = 125°C, IOUT = 2 A
–
–
Fixed Off-Time Proportion
toff
Based on calculated value
–15
Feedback Voltage
VFB
0.784
Output Voltage Regulation
VOUT
IOUT = 0 mA to 2 A
–3
Feedback Input Bias Current
IFB
–400
Soft Start Time
tss
5
Buck Switch Current Limit
ICL
VFB > 0.4 V
VFB < 0.4 V
2.2
0.5
ENB Open Circuit Voltage
VOC
Output disabled
2.0
ENB Input Voltage Threshold
VENB(0) LOW level input (Logic 0), output enabled
–
ENB Input Current
IENB(0)
VENB = 0 V
–10
VIN Undervoltage Threshold
VUVLO
VIN rising
6.6
VIN Undervoltage Hysteresis
VUVLO(hys) VIN falling
0.7
Thermal Shutdown Temperature
TJTSD
Temperature increasing
–
Thermal Shutdown Hysteresis
TJTSD(hys) Recovery = TJTSD – TJTSD(hys)
–
1Negative current is defined as coming out of (sourcing) the specified device pin.
2Specifications over the junction temperature range of 0ºC to 125ºC are assured by design and characterization.
3VBIAS is connected to VOUT when the VOUT target is between 3.3 and 5 V.
Typ.
0.90
4.4
–
3.5
450
650
–
0.8
–
–100
10
–
–
–
–
–
6.9
–
165
15
Max.
1.35
6.35
100
5
–
–
15
0.816
3
100
15
3
1.2
7
1.0
–1
7.2
1.1
–
–
Units
mA
mA
μA
mA
mΩ
mΩ
%
V
%
nA
ms
A
A
V
V
μA
V
V
°C
°C
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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