SC1452 Просмотр технического описания (PDF) - Semtech Corporation
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SC1452 Datasheet PDF : 15 Pages
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SC1452
POWER MANAGEMENT
Typical Characteristics (Cont.)
Bypass Start-up Rise Time vs. Junction Temperature
2.00
1.75
CBYP = 10nF
vs. Input Voltage
1.50
1.25
VIN = 4V
1.00
0.75
VIN = 6.5V
0.50
0.25
0.00
-50
-25
0
25
50
75
100
125
TJ (°C)
Reset Delay Times
vs. Junction Temperature
200
VOUT + 1V ≤ VIN ≤ 6.5V
175
tRSTB, DLYB = 0V
150
125
100
75
tRSTA
50
25
tRSTB, CDLYB = 10nF
0
-50
-25
0
25
50
75
100
125
TJ (°C)
Output Spectral Noise Density vs.
Frequency vs. Output Voltage
10
Top to bottom:
VOUT = 3.3V
VOUT = 3.0V
VOUT = 2.8V
1
VOUT = 2.5V
VOUT = 1.8V
0.1
0.01
VIN = VOUT + 1V
IOUT = 50mA
CIN = 1µF
CBYP = 10nF
COUT = 2.2µF
TJ = 25°C
0.01
0.1
1
10
f (kHz)
100
1000
Reset Threshold Voltage
vs. Junction Temperature
94
VOUT rising
93
92
91
90
VOUT falling
89
88
-50
-25
0
25
50
75
100
125
TJ (°C)
Delay Source Current and Voltage Threshold
vs. Junction Temperature
4.0
3.8 VOUT + 1V ≤ VIN ≤ 6.5V
3.6
IDLYB
3.4
3.2
3.0
VTH(DLYB)
2.8
2.6
2.4
2.2
2.0
-50 -25
0
25
50
75
100
TJ (°C)
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
125
Output Spectral Noise Density vs. Frequency
vs. Output Capacitance
10
1
0.1
0.01
0.001
VOUT = 3V
VIN = 4V
IOUT = 50mA
CBYP = 10nF
CIN = 1µF
TJ = 25°C
0.01
0.1
Left to right:
COUT = 44µF
COUT = 22µF
COUT = 10µF
COUT = 2.2µF
1
10
100
f (kHz)
1000
2006 Semtech Corp.
11
www.semtech.com
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