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A8498 Fiches technique(PDF) 4 Page - Allegro MicroSystems

No de pièce A8498
Description  Wide Input Voltage 3.0 A Step Down Regulator
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Fabricant  ALLEGRO [Allegro MicroSystems]
Site Internet  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8498 Fiches technique(HTML) 4 Page - Allegro MicroSystems

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Wide Input Voltage 3.0 A Step Down Regulator
A8498
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
VIN Quiescent Current
IVIN(Q)
VENB = LOW, VIN = 42 V, VBIAS = 3.2 V,
VFB = 1.5 V (not switching)
0.90
1.35
mA
VENB = LOW, VIN = 42 V, VBIAS < 3 V,
VFB = 1.5 V
4.4
6.35
mA
VENB = HIGH
100
μA
VBIAS Input Current
IBIAS
VBIAS = VOUT
3.5
5
mA
Buck Switch On Resistance
RDS(on)
TA = 25°C, IOUT = 3 A
450
TA = 125°C, IOUT = 3 A
650
Fixed Off-Time Proportion
Based on calculated value
–15
15
%
Feedback Voltage
VFB
0.784
0.8
0.816
V
Output Voltage Regulation
VOUT
IOUT = 0 mA to 3 A
–3
3
%
Feedback Input Bias Current
IFB
–400
–100
100
nA
Soft Start Time
tss
510
15
ms
Buck Switch Current Limit
ICL
VFB > 0.4 V
3.5
5
A
VFB < 0.4 V
0.5
1.2
A
ENB Open Circuit Voltage
VOC
Output disabled
2.0
7
V
ENB Input Voltage Threshold
VENB(0)
LOW level input (Logic 0), output enabled
1.0
V
ENB Input Current
IENB(0)
VENB = 0 V
–10
–1
μA
VIN Undervoltage Threshold
VUVLO
VIN rising
6.6
6.9
7.2
V
VIN Undervoltage Hysteresis
VUVLO(hys)
VIN falling
0.7
1.1
V
Thermal Shutdown Temperature
TJTSD
Temperature increasing
165
°C
Thermal Shutdown Hysteresis
TJTSD(hys)
Recovery = TJTSD – TJTSD(hys)
–15
°C
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.
ELECTRICAL CHARACTERISTICS1,2 at TA = 25°C, VIN = 8 to 50 V (unless noted otherwise)


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