SC2440 データシートの表示（PDF） - Semtech Corporation
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SC2440 Datasheet PDF : 26 Pages
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SC2440
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: -40°C < TA < 85°C, -40°C < TJ< 105°C, ROSC = 12.1KΩ, VSYNC = 0, VIN = 5V, VBOOST = 8V
Parameter
Conditions
Min
Typ
Max Units
COMP Switching Threshold
0.7
1.1
1.3
V
COMP Maximum Voltage
Channel Switching Frequecy
VFB = 0.9V
2.2
V
1.2
1.4
1.6
MHz
Maximum Duty Cycle
(Note 2)
80
90
%
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
VFB = 0.9V, VSS = 2.3V, COMP Pin Open
2
ISW = -2A
2.6
A
0.3
0.48
V
10
µA
Minimum Boost Voltage
Boost Pin Current
Minimum Soft-Start Voltage to Exit
Shutdown
ISW = -2A
ISW = -0.5A
ISW = -2A
SS1 Tied to SS2
1.8
2.5
V
20
30
mA
60
80
mA
0.2
0.4
0.7
V
Soft-start Charging Current
Soft-start Discharging Current
Minimum Soft-start Voltage to
Enable Overload Shutoff
VSS = 0V
VSS = 1.5V
VSS = 1.5V
VSS Rising
2
µA
1.8
µA
0.8
µA
2
V
FB Overload Threshold
Soft-start Voltage to Restart
Switching After Overload Shutoff
VSS = 2.3V, VFB Falling
VSS Falling
0.74
V
0.7
1
1.3
V
Power Good Threshold Below FB
Power Good Output Low Voltage
Power Good Pin Leakage Current
SYNC Input High Voltage
VFB Rising
VFB = 0.8V, IPGOOD = 250µA
VPGOOD = 5V
80
100
120
mV
0.2
0.4
V
0.1
1
µA
2
V
SYNC Input Low Voltage
(Note 1)
0.8
V
SYNC Frequency
SYNC Frequency = 2 X Channel
3.4
Frequency. (Note 1)
5
MHz
SYNC Pin Input Current
Thermal Shutdown Temperature
VSYNC = 2V
60
75
µA
155
°C
Thermal Shutdown Hysteresis
10
°C
Notes: (1) Guaranteed by design, not tested in production.
(2) The maximum duty cycle specified corresponds to 1.4MHz switching frequency. Duty cycles higher than those specified can be
achieved by lowering the operating frequency.
(3) This device is ESD sensitive. Use of standard ESD handling precautions is required.
© 2005 Semtech Corp.
3
www.semtech.com
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