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LTC1174 数据表(PDF) 3 Page - Linear Technology

部件名 LTC1174
功能描述  High Efficiency Step-Down and Inverting DC/DC Converter
Download  20 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1174 数据表(HTML) 3 Page - Linear Technology

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LTC1174
LTC1174-3.3/LTC1174-5
1174fe
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage Load Regulation
LTC1174-3.3 (Note 3)
20mA < ILOAD < 175mA, IPGM = 0V
–5
–70
mV
20mA < ILOAD < 400mA, IPGM = VIN
–45
–70
mV
LTC1174-5 (Note 3)
20mA < ILOAD < 175mA, IPGM = 0V
–5
–70
mV
20mA < ILOAD < 400mA, IPGM = VIN
–50
–70
mV
IQ
Input DC Supply Current (Note 4)
Active Mode
LTC1174: 4V < VIN < 12V, IPGM = 0V
450
600
µA
LTC1174HV: 4V < VIN < 16V, IPGM = 0V
450
600
µA
Sleep Mode
LTC1174: 4V < VIN < 12V
130
180
µA
LTC1174HV: 4V < VIN < 16V
130
180
µA
SHUTDOWN (Note 4)
LTC1174: VSHUTDOWN = 0V, 4V < VIN < 12V
1
10
µA
LTC1174HV: VSHUTDOWN = 0V, 4V < VIN < 16V
2
25
µA
VLBTRIP
Low-Battery Trip Point
1.25
1.4
V
ILBIN
Current into Pin 3
0.5
µA
ILBOUT
Current Sunk by Pin 2
LTC1174: VLBOUT = 0.4V
1.0
1.2
1.5
mA
LTC1174HV: VLBOUT = 0.4V
0.6
0.8
1.5
mA
VHYST
Comparator Hysteresis
LTC1174/LTC1174HV
7.5
15
30
mV
IPEAK
Current Limit
IPGM = VIN, VOUT = 0V
0.54
0.60
0.83
A
IPGM = 0V, VOUT = 0V
0.27
0.34
0.53
A
RON
ON Resistance of Switch
LTC1174
0.75
1.30
LTC1174HV
0.90
1.55
tOFF
Switch Off-Time (Note 6)
VOUT at Regulated Value
3
4
5
µs
VIH
SHUTDOWN Pin High
Minimum Voltage at Pin 8 for Device to Be Active
1.2
V
VIL
SHUTDOWN Pin Low
Maximum Voltage at Pin 8 for Device to Be in Shutdown
0.75
V
IIH
SHUTDOWN Pin Input Current
LTC1174: VSHUTDOWN = 12V
0.5
µA
LTC1174HV: VSHUTDOWN = 16V
2.0
µA
IIL
SHUTDOWN Pin Input Current
0
≤ VSHUTDOWN ≤ 0.8V
0.5
µA
The
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 9V, VSHUTDOWN = VIN, IPGM = 0V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VFB
Feedback Voltage
LTC1174I/LTC1174HVI
1.18
1.25
1.31
V
ILBOUT
Current Sunk by Pin 2
VLBOUT = 0.4V (LTC1174I)
0.75
1.2
2.0
mA
VLBOUT = 0.4V (LTC1174HVI)
0.50
0.8
1.6
mA
IPEAK
Current Limit
IPGM = VIN, VOUT = 0V (LTC1174I)
0.54
0.60
0.84
A
IPGM = 0V, VOUT = 0V (LTC1174I)
0.34
A
IPGM = VIN, VOUT = 0V (LTC1174HVI)
0.5
0.60
0.86
A
IPGM = 0V, VOUT = 0V (LTC1174HVI)
0.34
A
tOFF
Switch Off-Time (Note 6)
VOUT at Regulated Value (LTC1174I)
2.0
4
6.0
µs
VOUT at Regulated Value (LTC1174HVI)
1.8
4
6.2
µs
RON
Switch On Resistance
LTC1174I/LTC1174HVI
0.9
1.7
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 ≤ TA ≤ 85°C. LTC1174I and LTC1174HVI Only.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1174CN8, LTC1174CN8-3.3, LTC1174CN8-5:
TJ = TA + (PD × 110°C/W)
LTC1174CS8, LTC1174CS8-3.3, LTC1174CS8-5:
TJ = TA + (PD × 150°C/W)


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