Datasheet

3
LTC1504
ELECTRICAL CHARACTERISTICS
The ● 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: LTC1504 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
U
W
TEMPERATURE (°C)
–50

3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
25 75
1504 • TPC03
–25 0
50 100 125
SWITCH ON-RESISTANCE (Ω)
V
CC
= 10V
V
CC
= 5V
V
CC
= 3.3V
Switch On-Resistance vs
Temperature
Supply Current vs Supply Voltage
SUPPLY VOLTAGE (V)
2.5

1504 • TPC01
5
7.5 10
SUPPLY CURRENT (mA)
14
12
10
8
6
4
2
0
V
FB
= V
OUT
V
FB
= V
CC
T
A
= 25°C
I
OUT
= 0
Current Limit Threshold vs R
IMAX
R
IMAX
(Ω)
10k
CURRENT LIMIT THRESHOLD (mA)
700
600
500
400
300
200
100
0
100k
1504 • TPC04
T
A
= 25°C
V
CC
= 5V
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125
SUPPLY CURRENT (mA)
10
1
0.1
1504 • TPC02

V
FB
= V
OUT
V
FB
= V
CC
V
CC
= 5V
I
OUT
= 0
Supply Current vs Temperature