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參數(shù)資料
| 型號： | LTC1174-3.3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器) |
| 中文描述： | 高效率降壓和倒轉(zhuǎn)DC / DC轉(zhuǎn)換器（高效率，步降直流/直流變換器） |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 246K |
| 代理商： | LTC1174-3.3 |
3
LTC1174
LTC1174-3.3/LTC1174-5
SYMBOL PARAMETER
V
FB
Feedback Voltage
I
LBOUT
Current Sunk by Pin 2
CONDITIONS
LTC1174I/LTC1174HVI
V
LBOUT
= 0.4V (LTC1174I)
V
LBOUT
= 0.4V (LTC1174HVI)
I
PGM
= V
IN
, V
OUT
= 0V (LTC1174I)
I
PGM
= 0V, V
OUT
= 0V (LTC1174I)
I
PGM
= V
IN
, V
OUT
= 0V (LTC1174HVI)
I
PGM
= 0V, V
OUT
= 0V (LTC1174HVI)
V
OUT
at Regulated Value (LTC1174I)
V
OUT
at Regulated Value (LTC1174HVI)
LTC1174I/LTC1174HVI
MIN
1.18
0.75
0.50
0.54
TYP
1.25
1.2
0.8
0.60
0.34
0.60
0.34
4
4
0.9
MAX
1.31
2.0
1.6
0.78
UNITS
G
V
G
G
mA
mA
I
PEAK
Current Limit
G
A
A
A
A
G
0.5
0.8
t
OFF
Switch Off-Time (Note 6)
G
G
2.0
1.8
6.0
6.2
1.7
μ
s
μ
s
R
ON
Switch On Resistance
G
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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)
Note 3:
Guaranteed by design.
Note 4:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5:
Current into Pin 6 only, measured without electrolytic input
capacitor.
Note 6:
The off-time is wafer-sort trimmed.
SYMBOL PARAMETER
I
Q
Input DC Supply Current (Note 4)
CONDITIONS
Active Mode
LTC1174: 4V < V
IN
< 12V, I
PGM
= 0V
LTC1174HV: 4V < V
IN
< 16V, I
PGM
= 0V
Sleep Mode
LTC1174: 4V < V
IN
< 12V
LTC1174HV: 4V < V
IN
< 16V
SHUTDOWN (Note 4)
LTC1174: V
SHUTDOWN
= 0V, 4V < V
IN
< 12V
LTC1174HV: V
SHUTDOWN
= 0V, 4V < V
IN
< 16V
MIN
TYP
MAX
UNITS
450
450
600
600
μ
A
μ
A
130
130
180
180
μ
A
μ
A
1
2
10
25
1.4
0.5
1.5
1.5
30
0.78
0.50
1.30
1.55
5
μ
A
μ
A
V
μ
A
mA
mA
mV
V
LBTRIP
I
LBIN
I
LBOUT
Low-Battery Trip Point
Current into Pin 3
Current Sunk by Pin 2
1.25
LTC1174: V
LBOUT
= 0.4V
LTC1174HV: V
LBOUT
= 0.4V
LTC1174/LTC1174HV
I
PGM
= V
IN
, V
OUT
= 0V
I
PGM
= 0V, V
OUT
= 0V
LTC1174
LTC1174HV
V
OUT
at Regulated Value
Minimum Voltage at Pin 8 for Device to Be Active
Maximum Voltage at Pin 8 for Device to Be in Shutdown
LTC1174: V
SHUTDOWN
= 12V
LTC1174HV: V
SHUTDOWN
= 16V
0
≤
V
SHUTDOWN
≤
0.8V
1.0
0.6
7.5
0.54
0.27
1.2
0.8
15
0.60
0.34
0.75
0.90
4
V
HYST
I
PEAK
Comparator Hysteresis
Current Limit
G
G
A
A
μ
s
V
V
μ
A
μ
A
μ
A
R
ON
ON Resistance of Switch
G
G
t
OFF
V
IH
V
IL
I
IH
Switch Off-Time (Note 6)
SHUTDOWN Pin High
SHUTDOWN Pin Low
SHUTDOWN Pin Input Current
3
1.2
0.75
0.5
2.0
0.5
I
IL
SHUTDOWN Pin Input Current
The
G
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.
The
G
denotes specifications which apply over the full operating temperature range,
otherwise specifications are at –40
°
C
≤
T
A
≤
85
°
C. LTC1174I and LTC1174HVI Only.
ELECTRICAL CHARACTERISTICS
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