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A8499 Datasheet(PDF) 3 Page - Allegro MicroSystems

No. de Pieza. A8499
Descripción  High Voltage Step-Down Regulator
Descarga  7 Pages
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Fabricante  ALLEGRO [Allegro MicroSystems]
Página de inicio  http://www.allegromicro.com
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A8499 Datasheet(HTML) 3 Page - Allegro MicroSystems

   
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High Voltage Step-Down Regulator
A8499
3
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, IOUT = 0 mA, VIN = 42 V
VBIAS = VOUT (see note3)
0.90
1.35
mA
VENB = LOW, IOUT = 0 mA, VIN = 42 V
VBIAS < 3 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 = 2 A
700
800
TA = 125°C, IOUT = 2 A
1.6
Ω
Fixed Off-Time Proportion
Based on calculated value
–15
15
%
Feedback Voltage
VFB
1.176
1.200
1.224
V
Output Voltage Regulation
IOUT = 0 mA to 2 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 > 0.5 V
2.2
3
A
VFB < 0.5 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
6.9
7.1
V
VIN Undervoltage Hysteresis
VUVLOHYS
VIN falling
0.7
1.1
V
Thermal Shutdown Temperature
TJTSD
Temperature increasing
165
°C
Thermal Shutdown Hysteresis
∆TJ
Recovery = TJTSD – ∆TJ
–15
°C
1. Negative current is defined as coming out of (sourcing) the specified device pin.
2. Specifications over the junction temperature range of 0ºC to 125ºC are assured by design and characterization.
3. VBIAS is connected to VOUT node when VOUT target level is between 3.3 and 5 V.
ELECTRICAL CHARACTERISTICS1,2 at TA = 25°C, VIN = 8 to 50 V (unless noted otherwise)


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