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LTC3246 데이터시트(HTML) 4 Page - Analog Devices

부품명 LTC3246
상세내용  Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer
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LTC3246 데이터시트(HTML) 4 Page - Analog Devices

 
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LTC3246
4
3246fa
For more information www.linear.com/LTC3246
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: All voltages are referenced to GND unless otherwise specified.
Note 3: The LTC3246E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3246I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3246H is guaranteed over the –40°C to 150°C
operating junction temperature range. The LTC3246MP is guaranteed and
tested over the –55°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes; operating lifetime
is derated for junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
TYPICAL PERFORMANCE CHARACTERISTICS
Input Shutdown Current
vs Input Voltage
Input Operating Current
vs Input Voltage
Input Operating Current
vs Input Voltage
The junction temperature (TJ, in °C) is calculated from the ambient
temperature (TA, in °C) and power dissipation (PD, in watts) according to
the formula:
TJ = TA + (PD JA), where JA (in °C/W) is the package thermal
impedance.
Note 4: This IC has overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperatures
will exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
Note 5: The maximum operating junction temperature of 150°C must
be followed. Certain combinations of input voltage, output current and
ambient temperature will cause the junction temperature to exceed 150°C
and must be avoided. See Thermal Management section for information on
calculating maximum operating conditions.
Note 6: The LTC3246 will attempt to regulate the output voltage under
all load conditions, but like any regulator, the output will drop out if
inadequate supply voltage exists for the load. See VOUT Regulation section
for calculating available load current at low input operating voltages. Also
see “Boost Output Impedance at Dropout vs Temperature” for typical
impedance values at output voltages less than 3.3V.
TA = 25°C, unless otherwise noted.
0
4
8 12 16 20 24 28 32 36 40
0
1
2
3
4
5
6
7
8
9
10
3246 G01
TA = 125°C
TA = 25°C
VIN (V)
0
5
10
15
20
25
30
35
40
10
100
1000
3246 G02
NO LOAD
125°C
25°C
–55°C
VIN (V)
4
6
8
10
12
14
16
0
10
20
30
40
50
60
3246 G03
NO LOAD
TA = 125°C
TA = 25°C
TA = –55°C
VIN (V)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Watchdog Timer Control Pin (WT)
IWT(UP)
WT Pull-Up Current
VWT = 0.3V
l
–2
–3.1
–4.2
µA
IWT(DOWN)
WT Pull-Down Current
VWT = 1.3V
l
2
3.1
4.2
µA
IWT(INT)
Internal WT Detect Current
VWT = VBIAS
l
0.4
1
µA
VWT(INT)
WT Internal Timer Threshold
VWT Rising
l
2
2.2
2.65
V
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, CFLY = 2.2µF, COUT = 10µF, unless otherwise noted.


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