A4403GEU-T データシートの表示（PDF） - Allegro MicroSystems
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A4403GEU-T Datasheet PDF : 15 Pages
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A4403
Valley Current Mode Control Buck Converter
ELECTRICAL CHARACTERISTICS1 valid at TJ = 25°C, VIN = 9 to 46 V, unless otherwise noted
Characteristic
Symbol
Conditions
Min.
Typ.
Max. Units
General
VIN Quiescent Current
Feedback Voltage
Feedback Input Bias Current
Output Voltage Tolerance2
On-Time Tolerance
Minimum On-Time Period
Minimum Off-Time Period
Buck Switch On-Resistance
Current Limit Threshold
Soft Start Current Source
Input
IVINOFF
IVINON
VFB
IBIAS
∆VOUT
∆TON
Ton(min)
Toff(min)
RDS(on)
ILIM
ISS
DIS = high, VIN = 46 V
DIS = low, VIN = 46 V, ILOAD= 1 mA
TJ = 25°C
ILOAD = 1 mA to 3 A
Based on selected value
TJ = 25°C, ILOAD = 3 A
TJ = 125°C, ILOAD = 3 A
Valley current in external sense resistors = 50 mΩ
–
–
100
μA
–
4.3
5.5
mA
0.792
0.8
0.808
V
–400 –100
100
nA
–2.5
–
2.5
%
–15
–
15
%
–
50
60
ns
–
–
350
ns
–
350
–
mΩ
–
550
–
mΩ
3.0
3.6
4.2
A
5
10
15
μA
DIS Input Voltage Threshold
DIS Open-Circuit Voltage
DIS Input Current
Protection
VDIS
VDISOC
IIN
Device enabled
Device disabled
DIS = 0 V
–
–
2
–
–10
–
1
V
7
V
–1
μA
FB Overvoltage Shutdown
VFBOV
–
0.88
–
V
VIN Undervoltage Shutdown Threshold
VINUV Voltage rising
6.4
–
7.5
V
VIN Undervoltage Shutdown Hysteresis VINUV(hys)
0.7
–
1.1
V
Overtemperature Shutdown Threshold
TJTSD Temperature rising
–
165
–
°C
Overtemperature Shutdown Hysteresis TJTSD(hys) Recovery = TJTSD – TJTSD(hys)
–
15
–
°C
1Specifications over the junction temperature range of –40°C to 125°C are assured by design and characterization.
2Average value of VOUT relative to target voltage. Note that the tolerance effects of the feedback resistors are not taken into account. This figure does
include the feedback voltage tolerance.
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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