LTC2939 查看數據表（PDF） - Linear Technology
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LTC2939 Datasheet PDF : 20 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC2938/LTC2939
Supply Current vs Temperature
90
V1 = 5V
V2 = 3.3V
V3 = 2.5V
85
V4 = 1.8V
V5 = V6 = 1V
I(V4) vs V4 in –ADJ mode
–100μ
–10μ
–1μ
125°C
80
–100n
85°C
–10n
75
–1n
25°C
70
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
29389 G04
RST Pull-Up Current vs V2
18
TA = 25°C
15
–100p
–300 –250 –200 –150 –100
V4 (mV)
–50 0
29389 G05
RST Output Voltage vs V1,
VPG = GND
6
TA = 25°C
10k PULL-UP FROM RST TO V1
5 V1 = V2
12
4
9
VRT33
6
VRT25
VRT18
3
VRT15
VRT12
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V2 (V)
29389 G07
3
2
1
0
0
1
2
3
V1 (V)
4
5
29389 G08
Reset Timeout Period
vs Temperature
5 CRT = 1500pF
(SILVER MICA)
4
Watchdog Timeout Period vs CWT
100
TA = 25°C
10
1
3
100m
10m
2
1m
1
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
29389 G10
100μ
10p 100p
1n 10n
CWT (F)
100n 1μ
29389 G11
Transient Duration
vs Comparator Overdrive
400
TA = 25°C
350
300
250
200
RESET OCCURS
ABOVE CURVE
150
100
50
0
0.1
1
10
100
RESET COMPARATOR OVERDRIVE (% OF VRTX)
29389 G06
Watchdog Timeout Period
vs Temperature
36
CWT = 1500pF
(SILVER MICA)
34
32
30
28
26
24
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
29389 G09
Reset Timeout Period vs CRT
10
TA = 25°C
1
100m
10m
1m
100μ
10μ
10p 100p
1n 10n
CRT (F)
100n 1μ
29389 G12
293839ff
5
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