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LTC1439 数据表(PDF) 6 Page - Linear Technology

部件名 LTC1439
功能描述  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
Download  32 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1439 数据表(HTML) 6 Page - Linear Technology

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LTC1438/LTC1439
6
14389fb
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Oscillator Frequency
vs Temperature
Transient Response
Transient Response
Maximum Current Sense
Threshold Voltage vs Temperature
ILOAD = 50mA to 1A
1438 G14
ILOAD = 1A to 3A
1438 G15
RUN/SS Pin Current
vs Temperature
VOUT
50mV/DIV
VOUT
50mV/DIV
VOUT
20mV/DIV
VITH
200mV/DIV
ILOAD = 50mA
1438 G16
Burst Mode Operation
Auxiliary Regulator Load
Regulation
SFB1 Pin Current vs Temperature
Soft Start: Load Current vs Time
1438 G17
RUN/SS
5V/DIV
INDUCTOR
CURRENT
1A/DIV
TEMPERATURE (°C)
–40
5
10
35
85
1438 G10
fO
–15
10
60
110
135
–5
–10
TEMPERATURE (°C)
–40
0
1
2
3
4
–15
10
35
60
1438 G11
85
110
135
TEMPERATURE (°C)
–40
–1.50
– 0.25
0
35
85
1438 G12
– 0.75
–1.00
–15
10
60
110
135
–1.25
–1.50
TEMPERATURE (°C)
–40
146
148
150
152
154
–15
10
35
60
1438 G13
85
110
135
AUXILIARY LOAD CURRENT (mA)
0
12.0
12.1
12.2
160
1438 G18
11.9
11.8
11.7
40
80
120
200
EXTERNAL PNP: 2N2907A


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