LTC1174
LTC1174-3.3/LTC1174-5
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = 9V, V
= V , I
= 0V, unless otherwise noted.
A
IN
SHUTDOWN
IN PGM
SYMBOL PARAMETER
Output Voltage Load Regulation
CONDITIONS
MIN
TYP
MAX
UNITS
LTC1174-3.3 (Note 3)
20mA < I
20mA < I
< 175mA, I
< 400mA, I
= 0V
–5
–45
–70
–70
mV
mV
LOAD
LOAD
PGM
PGM
= V
IN
LTC1174-5 (Note 3)
20mA < I
20mA < I
< 175mA, I
< 400mA, I
= 0V
–5
–50
–70
–70
mV
mV
LOAD
LOAD
PGM
PGM
= V
IN
I
Input DC Supply Current (Note 4)
Active Mode
Q
LTC1174: 4V < V < 12V, I
= 0V
PGM
450
450
600
600
µA
µA
IN
PGM
LTC1174HV: 4V < V < 16V, I
= 0V
IN
Sleep Mode
LTC1174: 4V < V < 12V
130
130
180
180
µA
µA
IN
LTC1174HV: 4V < V < 16V
IN
SHUTDOWN (Note 4)
LTC1174: V
= 0V, 4V < V < 12V
1
2
10
25
µA
µA
SHUTDOWN
IN
LTC1174HV: V
= 0V, 4V < V < 16V
IN
SHUTDOWN
V
Low-Battery Trip Point
Current into Pin 3
1.25
1.4
0.5
V
LBTRIP
I
I
µA
mA
mA
LBIN
Current Sunk by Pin 2
LTC1174: V
= 0.4V
LBOUT
LBOUT
1.0
0.6
1.2
0.8
1.5
1.5
LBOUT
LTC1174HV: V
= 0.4V
V
Comparator Hysteresis
Current Limit
LTC1174/LTC1174HV
7.5
15
30
mV
HYST
I
I
I
= V , V
= 0V
= 0V
●
●
0.54
0.27
0.60
0.34
0.83
0.53
A
A
PEAK
PGM
PGM
IN OUT
= 0V, V
OUT
R
ON
ON Resistance of Switch
LTC1174
LTC1174HV
●
●
0.75
0.90
1.30
1.55
Ω
Ω
t
Switch Off-Time (Note 6)
SHUTDOWN Pin High
V
at Regulated Value
3
4
5
µs
V
OFF
OUT
V
V
Minimum Voltage at Pin 8 for Device to Be Active
Maximum Voltage at Pin 8 for Device to Be in Shutdown
LTC1174: V = 12V
1.2
IH
IL
SHUTDOWN Pin Low
0.75
V
I
SHUTDOWN Pin Input Current
0.5
2.0
µA
µA
IH
SHUTDOWN
SHUTDOWN
LTC1174HV: V
= 16V
I
SHUTDOWN Pin Input Current
0 ≤ V
≤ 0.8V
SHUTDOWN
0.5
µA
IL
The
●
denotes specifications which apply over the full operating temperature range,
otherwise specifications are at –40°C ≤ T ≤ 85°C. LTC1174I and LTC1174HVI Only.
A
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Feedback Voltage
LTC1174I/LTC1174HVI
●
1.18
1.25
1.31
V
FB
I
Current Sunk by Pin 2
V
V
= 0.4V (LTC1174I)
= 0.4V (LTC1174HVI)
●
●
0.75
0.50
1.2
0.8
2.0
1.6
mA
mA
LBOUT
LBOUT
LBOUT
I
Current Limit
I
I
= V , V
= 0V (LTC1174I)
= 0V (LTC1174I)
●
0.54
0.60
0.34
0.84
A
A
PEAK
PGM
PGM
IN OUT
OUT
= 0V, V
I
I
= V , V
= 0V (LTC1174HVI)
= 0V (LTC1174HVI)
●
0.5
0.60
0.34
0.86
A
A
PGM
PGM
IN OUT
= 0V, V
OUT
t
Switch Off-Time (Note 6)
Switch On Resistance
V
V
at Regulated Value (LTC1174I)
at Regulated Value (LTC1174HVI)
●
●
2.0
1.8
4
4
6.0
6.2
µs
µs
Ω
OFF
OUT
OUT
R
LTC1174I/LTC1174HVI
●
0.9
1.7
ON
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: T is calculated from the ambient temperature T and power
J A
dissipation P according to the following formulas:
D
LTC1174CN8, LTC1174CN8-3.3, LTC1174CN8-5:
T = T + (P × 110°C/W)
J
A
D
LTC1174CS8, LTC1174CS8-3.3, LTC1174CS8-5:
T = T + (P × 150°C/W)
J
A
D
1174fe
3