LTC1504A
ELECTRICAL CHARACTERISTICS
SYMBOL
I
SS
t
r
, t
f
DC
MAX
PARAMETER
Soft Start Source Current
Output Switch Rise/Fall Time
Maximum Duty Cycle
CONDITIONS
V
SS
= 0V, Commercial
V
SS
= 0V, Industrial
10% to 90% Ouput Swing
V
COMP
= V
CC
q
q
q
q
V
CC
= 5V, T
A
= 25°C unless otherwise specified. (Note 2)
MIN
–8
–8
100
TYP
–12
–12
5
MAX
–16
–17
50
UNITS
µA
µA
ns
%
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
V
CC
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 g
mV
and A
V
values 2.6 times
lower than the specified values, due to the internal divider resistors.
Note 6:
The I
LIM
amplifier can sink but not source current. Under normal
(not current limited) operation, the I
LIM
output current will be zero.
Note 7:
Contact factory for guaranteed specifications at 2.7V supply.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
14
12
SUPPLY CURRENT (mA)
10
8
6
4
2
V
FB
= V
CC
0
2.5
7.5
5
SUPPLY VOLTAGE (V)
10
1504A • TPC01
T
A
= 25°C
I
OUT
= 0
SUPPLY CURRENT (mA)
V
FB
= V
OUT
SWITCH ON-RESISTANCE (Ω)
V
FB
= V
OUT
Current Limit Threshold vs R
IMAX
700
CURRENT LIMIT THRESHOLD (mA)
600
500
400
300
200
100
0
10k
R
IMAX
(Ω)
1504A • TPC04
CURRENT LIMIT THRESHOLD (mA)
400
350
300
250
200
150
100
50
0
–50 –25
0
25
50
75
TEMPERATURE (°C)
100
125
R
IMAX
= 22k
R
IMAX
= 47k
SHUTDOWN PIN THRESHOLD (V)
T
A
= 25°C
V
CC
= 5V
U W
Supply Current vs Temperature
10
V
CC
= 5V
I
OUT
= 0
Switch On-Resistance vs
Temperature
3.5
3.0
2.5
2.0
1.5
1.0
0.5
V
CC
= 3.3V
V
CC
= 5V
V
CC
= 10V
1
V
FB
= V
CC
0.1
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
1504A • TPC02
1504A • TPC03
Current Limit Threshold vs
Temperature
500
450
V
CC
= 5V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Shutdown Threshold vs
Supply Voltage
100k
3
5
7
SUPPLY VOLTAGE (V)
10
1504A • TPC07
1504A • TPC05
3
LINER [ LINEAR TECHNOLOGY ]
