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