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SC471AMLTRT Datasheet(PDF) 5 Page - Semtech Corporation

Part # SC471AMLTRT
Description  Synchronous Buck Controller with Multi-Level VOUT Transition Support
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC471AMLTRT Datasheet(HTML) 5 Page - Semtech Corporation

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© 2008 Semtech Corp.
SC471/SC471A
www.semtech.com
POWER MANAGEMENT
Parameter
Conditions
25°C
-40° to 85°C
Units
Min
Typ
Max
Min
Max
Fault Protection (continued)
Output Under-Voltage Fault
FB with Respect to Nominal
-30
-35
-25
%
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
μs
G0/G1 Transition
Over-Voltage Fault
FB with Respect to Nominal;
valid for 32 cycles after G0/G1
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, G1
1.2
V
Logic Input Low Voltage
EN, G0, G1
0.4
V
EN Input Bias Current
EN = 5V
-1
+1
μA
G0, G1 Input Bias Current
G0, G1 = 5V
5
0
10
μA
Power Good Output
Low Voltage
R
PWRGD = 10kΩ 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 first pulls DH high with a pull-up resistance of 10Ω (typical) until LX = 1.5V (typical). At this point, an ad-
ditional pull-up device is activated, reducing the resistance to 2Ω (typical). This negates the need for an external gate or boost resistor.
Electrical Characteristics (continued)


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