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參數(shù)資料
| 型號： | SC475AMLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Controller with Dual-Level VOUT Transition Support |
| 中文描述： | 同步降壓控制器與雙級VOUT電源支持過渡 |
| 文件頁數(shù)： | 5/27頁 |
| 文件大?。?/td> | 603K |
| 代理商： | SC475AMLTRT |
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5
2006 Semtech Corp.
SC475A
www.semtech.com
POWER MANAGEMENT
Electrical Characteristics
(continued)
Parameter
Conditions
25°C
-40° to 85°C
Units
Min
Typ
Max
Min
Max
Fault Protection (continued)
Steady-State
Over-Voltage Fault
FB with Respect to Nominal
+20
+17
+23
%
Steady-State
Over-Voltage Fault Delay
FB Forced 50mV Above
Over-Voltage Fault Threshold
5
μ
s
G0 Transition
Over-Voltage Fault
FB with Respect to Nominal;
Valid for 32 cycles after G0
Transition
+50
%
Smart Power Save Threshold
FB with Respect to Nominal
+8
%
Over-Temperature Shutdown
(1)
Latching, >10°C Hysteresis
160
°C
Logic Inputs/Outputs
Logic Input High Voltage
EN, G0
1.2
V
Logic Input Low Voltage
EN, G0
0.4
V
EN Input Bias Current
EN = 5V
-1
+1
μ
A
G0 Input Bias Current
G0 = 5V
5
0
10
μ
A
Power Good Output
Low Voltage
R
PWRGD
= 10k
Ω
to VCC
0.4
V
Gate Drivers
Shoot-Through
Protection Delay
(1)
DH or DL Rising
30
ns
DL Pull-Down Resistance
0.8
1.6
Ω
DL Sink Current
V
DL
= 2.5V
3.1
A
DL Pull-Up Resistance
2
4
Ω
DL Source Current
V
DL
= 2.5V
1.3
A
DH Pull-Down Resistance
BST - LX = 5V
2
4
Ω
DH Pull-Up Resistance
(2)
BST - LX = 5V
2
4
Ω
DH Sink/Source Current
V
DH
= 2.5V
1.3
A
Notes:
1) Guaranteed by design.
2) Semtech’s SmartDriver FET drive
fi
rst pulls DH high with a pull-up resistance of 10
Ω
(typical) until LX = 1.5V (typical). At this point,
an additional pull-up device is activated, reducing the resistance to 2
Ω
(typical). This negates the need for an external gate or boost resistor.
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