LTC1147-3.3
LTC1147-5/LTC1147L
ELECTRICAL CHARACTERISTICS
TA = 25°C, VIN = 10V, VSHDN = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS MIN TYP
MAX
UNITS
V – V
5
Current Sense Threshold Voltage (Note 6)
LTC1147-3.3, LTC1147L-3.3
4
–
–
–
–
–
–
V
V
V
V
V
V
= V
= V
= V
= V
+ 100mV (Forced)
– 100mV (Forced)
+ 100mV (Forced)
– 100mV (Forced)
25
150
25
150
25
150
mV
mV
mV
mV
mV
mV
SENSE
SENSE
SENSE
SENSE
SENSE
SENSE
OUT
OUT
OUT
OUT
130
130
130
170
170
170
LTC1147–5
LTC1147L
= 5V, V6 = V /4 + 25mV (Forced)
OUT
OUT
= 5V, V6 = V /4 – 25mV (Forced)
V
SHDN Pin Threshold
6
LTC1147-3.3/LTC1147-5/LTC1147L-3.3
0.5
0.8
1.2
2
5
V
I
I
t
SHDN Pin Input Current
LTC1147-3.3/LTC1147-5/LTC1147L-3.3
6
0V < V
< 8V, V = 16V
µA
SHDN
IN
–
C Pin Discharge Current
T
V
V
in Regulation, V
= 0V
= V
OUT
50
4
70
2
90
10
µA
µA
2
OUT
OUT
SENSE
Off-Time (Note 3)
C = 390pF, I = 700mA
T LOAD
5
6
µs
OFF
t , t
r
Driver Output Transition Times
C = 3000pF (Pin 8), V = 6V
100
200
ns
f
L
IN
–40°C ≤ TA ≤ 85°C (Note 4), VIN = 10V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
Feedback Voltage (LTC1147L)
V
V
= 9V
= 9V
= 700mA
= 700mA
●
1.20
1.25
1.30
V
6
IN
Regulated Output Voltage
LTC1147-3.3/LTC1147L-3.3
LTC1147-5
OUT
IN
I
I
●
●
3.17
4.85
3.33
5.05
3.43
5.20
V
V
LOAD
LOAD
I
Input DC Supply Current (Note 2)
LTC1147 Series
(Note 5)
Q
Normal Mode
4V < V < 12V
1.6
160
160
10
2.4
260
260
22
mA
µA
µA
µA
IN
Sleep Mode
Sleep Mode (LTC1147-5)
Shutdown
4V < V < 12V
IN
5V < V < 12V
IN
V
= 2.1V, 4V < V < 12V
SHDN
IN
LTC1147L Series
Normal Mode
3.5V < V < 12V
1.6
160
10
2.4
260
22
mA
µA
µA
IN
Sleep Mode
3.5V < V < 12V
IN
Shutdown (LTC1147L-3.3)
V
= 2.1V, 3.5V < V < 12V
SHDN
IN
V – V
5
Current Sense Threshold Voltage (Note 6)
LTC1147-3.3
4
–
V
V
V
V
V
V
= V
= V
= V
= V
+ 100mV (Forced)
25
150
25
150
25
150
mV
mV
mV
mV
mV
mV
SENSE
SENSE
SENSE
SENSE
SENSE
SENSE
OUT
OUT
OUT
OUT
–
–
–
–
–
– 100mV (Forced)
+ 100mV (Forced)
– 100mV (Forced)
●
●
125
125
125
185
185
185
LTC1147-5
LTC1147L
= 5V, 6V = V /4 + 25mV (Forced)
OUT
= 5V, 6V = V /4 – 25mV (Forced)
OUT
V
SHDN Pin Threshold
6
LTC1147-3.3/LTC1147-5/LTC1147L-3.3
0V < V
< 8V, V = 16V
0.5
3.8
0.8
5
2
V
SHDN
IN
t
Off-Time (Note 3)
C = 390pF, I = 700mA
T LOAD
6.5
µs
OFF
The
temperature range.
Note 1: T is calculated from the ambient temperature T and power
●
denotes specifications which apply over the full specified
Note 3: In applications where R
time increases approximately 40%.
Note 4: The LTC1147C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at –40°C and 85°C. The
LTC1147I is guaranteed to meet the extended temperature limits.
is placed at ground potential, the off-
SENSE
J
A
dissipation P according to the following formulas:
D
LTC1147CN8-3.3/LTC1147CN8-5: T = T + (P )(110°C/W)
J
A
D
LTC1147LIS/LTC1147IS8/LTC1147LCS/
LTC1147CS8-3.3/LTC1147CS8-5: T = T + (P )(150°C/W)
J
A
D
Note 5: The LTC1147L/LTC1147L-3.3 allow operation to V = 3.5V.
IN
Note 2: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: The LTC1147L is tested with external feedback resistors resulting
in a nominal output voltage of 2.5V.
sn1147 1147fds
3
Linear Systems [ Linear Systems ]
