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LTC1504AC датащи(PDF) 3 Page - Linear Technology

номер детали LTC1504AC
подробное описание детали  500mA Low Voltage Step-Down Synchronous Switching Regulator
PDF  12 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC1504AC датащи(HTML) 3 Page - Linear Technology

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LTC1504A
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device 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: This parameter is guaranteed by correlation and is not tested
directly.
Note 4: LTC1504A quiescent current is dominated by the gate drive
current drawn by the onboard power switches. With FB or SENSE pulled to
VCC the output stage will stop switching and the static quiescent current
can be observed. With FB or SENSE hooked up normally, the output stage
will be switching and total dynamic supply current can be measured.
Note 5: Fixed output parts will appear to have gmV and AV values 2.6 times
lower than the specified values, due to the internal divider resistors.
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: Contact factory for guaranteed specifications at 2.7V supply.
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (
°C)
–50
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
25
75
1504A • TPC03
–25
0
50
100
125
VCC = 10V
VCC = 5V
VCC = 3.3V
Switch On-Resistance vs
Temperature
Supply Current vs Supply Voltage
SUPPLY VOLTAGE (V)
2.5
1504A • TPC01
5
7.5
10
14
12
10
8
6
4
2
0
VFB = VOUT
VFB = VCC
TA = 25°C
IOUT = 0
Current Limit Threshold vs RIMAX
RIMAX (Ω)
10k
700
600
500
400
300
200
100
0
100k
1504A • TPC04
TA = 25°C
VCC = 5V
TEMPERATURE (
°C)
–50
–25
0
25
50
75
100
125
10
1
0.1
1504A • TPC02
VFB = VOUT
VFB = VCC
VCC = 5V
IOUT = 0
Supply Current vs Temperature
Shutdown Threshold vs
Supply Voltage
SUPPLY VOLTAGE (V)
35
7
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
10
1504A • TPC07
Current Limit Threshold vs
Temperature
TEMPERATURE (
°C)
–50 –25
0
25
50
75
1504A • TPC05
125
500
450
400
350
300
250
200
150
100
50
0
100
VCC = 5V
RIMAX = 47k
RIMAX = 22k
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ISS
Soft Start Source Current
VSS = 0V, Commercial
q
–8
–12
–16
µA
VSS = 0V, Industrial
q
–8
–12
–17
µA
tr, tf
Output Switch Rise/Fall Time
10% to 90% Ouput Swing
q
550
ns
DCMAX
Maximum Duty Cycle
VCOMP = VCC
q
100
%
VCC = 5V, TA = 25°C unless otherwise specified. (Note 2)



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