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參數(shù)資料
| 型號(hào)： | A8499SLJTR-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | High Voltage Step-Down Regulator |
| 中文描述： | 高電壓降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 276K |
| 代理商： | A8499SLJTR-T |
A8499-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A8499
High Voltage Step-Down Regulator
3
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
VIN Quiescent Current
I
VIN(Q)
V
ENB
= LOW, I
OUT
= 0 mA, V
IN
= 42 V
V
BIAS
= V
OUT
(see note
3
)
V
ENB
= LOW, I
OUT
= 0 mA, V
IN
= 42 V
V
BIAS
< 3 V
V
ENB
= HIGH
V
BIAS
= V
OUT
T
A
= 25°C, I
OUT
= 2 A
T
A
= 125°C, I
OUT
= 2 A
Based on calculated value
–
0.90
1.35
mA
–
4.4
6.35
mA
–
–
100
μ
A
VBIAS Input Current
I
BIAS
–
3.5
5
mA
Buck Switch On Resistance
R
DS(on)
–
700
800
m
Ω
–
–
1.6
Ω
Fixed Off-Time Proportion
–15
–
15
%
Feedback Voltage
V
FB
1.176
1.200
1.224
V
Output Voltage Regulation
I
OUT
= 0 mA to 2 A
–3
–
3
%
Feedback Input Bias Current
I
FB
t
ss
–400
–100
100
nA
Soft Start Time
5
10
15
ms
Buck Switch Current Limit
I
CL
V
FB
> 0.5 V
V
FB
< 0.5 V
Output disabled
2.2
–
3
A
0.5
–
1.2
A
ENB Open Circuit Voltage
V
OC
V
ENB(0)
I
ENB(0)
V
UVLO
V
UVLOHYS
T
JTSD
Δ
T
J
2.0
–
7
V
ENB Input Voltage Threshold
LOW level input (Logic 0), output enabled
–
–
1.0
V
ENB Input Current
V
ENB
= 0 V
V
IN
rising
V
IN
falling
Temperature increasing
–10
–
–1
μ
A
VIN Undervoltage Threshold
–
6.9
7.1
V
VIN Undervoltage Hysteresis
0.7
–
1.1
V
Thermal Shutdown Temperature
–
165
–
°C
Thermal Shutdown Hysteresis
Recovery = T
JTSD
–
Δ
T
J
–
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 V
OUT
target level is between 3.3 and 5 V.
ELECTRICAL CHARACTERISTICS
1,2
at T
A
= 25°C, V
IN
= 8 to 50 V (unless noted otherwise)
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