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LTC1649 数据表(PDF) 3 Page - Linear Technology

部件名 LTC1649
功能描述  3.3V Input High Power Step-Down Switching Regulator Controller
Download  16 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1649 数据表(HTML) 3 Page - Linear Technology

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LTC1649
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a part may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: Maximum Duty Cycle limitations will limit the output voltage
obtainable at very low supply voltages.
Note 4: Supply current at PVCC1 and PVCC2 is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
will vary with the operating voltage and the external MOSFETs used.
Note 5: Under normal operating conditions, the charge pump will skip
cycles to maintain regulation and the apparent frequency will be lower than
700kHz.
Note 6: The ILIM amplifier can sink but not source current. Under normal
(not current limited) operation, the ILIM output current will be zero.
Note 7: Driver rise and fall times are measured from 10% to 90%.
TYPICAL PERFOR A CE CHARACTERISTICS
TEMPERATURE (
°C)
–40
210
220
240
20
60
1649 G02
200
190
–20
0
40
80
100
180
170
230
VCC = 5V
Oscillator Frequency
vs Temperature
TEMPERATURE (
°C)
–40
12.5
13.0
14.0
20
60
1649 G01
12.0
11.5
–20
0
40
80
100
11.0
10.5
13.5
VCC = 5V
IMAX Pin Current vs Temperature
TEMPERATURE (
°C)
–40
70
75
85
90
95
0
40
60
1649 G03
80
–20
20
80
100
100
VCOMP = VCC
VFB = 1.265V
VCC = 5V
Maximum Duty Cycle
vs Temperature
Error Amplifier Transconductance
vs Temperature
TEMPERATURE (
°C)
–40
350
400
500
550
600
850
700
0
40
60
100
1649 G04
450
750
800
650
–20
20
80
gm =
∆ICOMP
∆VFB
VCC = 5V
Output Voltage vs Load Current
with Current Limit
LOAD CURRENT (A)
0
1.5
2.0
2.5
6
10
1649 G07
1.0
0.5
0
24
8
3.0
3.5
4.0
12
TA = 25°C
VCC = 5V
FIGURE 1
RIMAX = 16k
RIMAX = 33k
Load Regulation
LOAD CURRENT (A)
0
–1.0
– 0.8
– 0.4
– 0.2
0
0.4
1
5
7
1649 G06
– 0.6
0.2
4
9
10
2
3
68
TA = 25°C
VOUT = 3.3V
VCC = 5V
FIGURE 1
ELECTRICAL CHARACTERISTICS


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