LTC1174-3.3 Linear Technology, LTC1174-3.3 Datasheet - Page 3

• Manufacturer Part Number: LTC1174-3.3
• Description: High Efficiency Step-Down and Inverting DC/DC Converter
• Manufacturer: Linear Technology

SYMBOL PARAMETER
I
V
I
I
V
I
R
t
V
V
I
I
– 40 C T
SYMBOL PARAMETER
V
I
I
t
The
temperature range.
Note 1: T
dissipation P
ELECTRICAL C
Q
LBIN
LBOUT
PEAK
OFF
IH
IL
LBOUT
PEAK
OFF
LBTRIP
HYST
IH
IL
FB
ON
LTC1174CN8, LTC1174CN8-3.3, LTC1174CN8-5:
LTC1174CS8, LTC1174CS8-3.3, LTC1174CS8-5:
denotes specifications which apply over the full operating
J
Input DC Supply Current (Note 3)
Low-Battery Trip Point
Current into Pin 3
Current Sunk by Pin 2
Comparator Hysteresis
Current Limit
ON Resistance of Switch
Switch Off-Time (Note 5)
SHUTDOWN Pin High
SHUTDOWN Pin Low
SHUTDOWN Pin Input Current
SHUTDOWN Pin Input Current
Feedback Voltage
Current Sunk by Pin 2
Current Limit
Switch Off-Time (Note 5)
is calculated from the ambient temperature T
T
T
A
J
J
D
= T
= T
according to the following formulas:
85 C (Note 6), for LTC1174I only.
A
A
+ (P
+ (P
D
D
110 C/W)
150 C/W)
HARA TERISTICS
C
CONDITIONS
Active Mode
LTC1174: 4V < V
LTC1174HV: 4V < V
Sleep Mode
LTC1174: 4V < V
LTC1174HV: 4V < V
SHUTDOWN (Note 4)
LTC1174: V
LTC1174HV: V
LTC1174: V
LTC1174HV: V
LTC1174/LTC1174HV
I
LTC1174
LTC1174HV
V
Minimum Voltage at Pin 8 for Device to Be Active
Maximum Voltage at Pin 8 for Device to Be in Shutdown
LTC1174: V
LTC1174HV: V
0 V
CONDITIONS
LTC1174I
V
I
I
V
PGM
I
PGM
PGM
PGM
OUT
LBOUT
OUT
= V
SHUTDOWN
= V
= 0V, V
at Regulated Value
at Regulated Value
= 0V, V
A
and power
= 0.4
IN
IN
, V
, V
SHUTDOWN
LBOUT
SHUTDOWN
OUT
OUT
OUT
OUT
SHUTDOWN
LBOUT
SHUTDOWN
= 0V
IN
IN
T
= 0V
= 0V
= 0V
= 0.4V
0.8V
A
< 12V, I
< 12V
IN
IN
= 25 C, V
= 0.4V
< 16V, I
< 16V
= 0V, 4V < V
= 12V
= 0V, 4V < V
= 16V
PGM
PGM
Note 2: Guaranteed by design.
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 4: Current into pin 6 only, measured without electrolytic input
capacitor.
Note 5: The off-time is wafer-sort trimmed.
Note 6: The LTC1174I is not tested and not quality assurance sampled at
– 40 C and 85 C. These specifications are guaranteed by design and/or
correlation.
IN
= 0V
= 9V, V
= 0V
IN
< 12V
IN
< 16V
SHUTDOWN
LTC1174-3.3/LTC1174-5
= V
IN
, I
PGM
= 0V, unless otherwise noted.
MIN
0.54
0.27
MIN
1.18
0.75
0.54
1.0
0.6
1.2
7.5
3
2
1.25
0.60
0.34
0.75
0.90
1.25
0.60
0.34
TYP
TYP
450
450
130
130
1.2
0.8
1.2
15
1
2
4
4
MAX
MAX
LTC1174
0.78
0.50
1.30
1.55
0.75
1.31
0.78
600
600
180
180
1.4
0.5
1.5
1.5
0.5
2.0
0.5
10
25
30
5
2
6
UNITS
UNITS
3
mA
mA
mV
mA
A
A
A
A
A
A
V
A
A
A
V
V
A
A
V
A
A
s
s