LTC1265I Просмотр технического описания (PDF) - Linear Technology
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LTC1265I Datasheet PDF : 16 Pages
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LTC1265/LTC1265-3.3/LTC1265-5
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VSHDN = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIH
Shutdown Pin High
Min Voltage at Pin 10 for Device to be in Shutdown
VIL
Shutdown Pin Low
Max Voltage at Pin 10 for Device to be Active
I10
Shutdown Pin Input Current
VSHDN = 8V
1.2
V
0.6
V
0.5
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1265CS, LTC1265CS-3.3, LTC1265CS-5:
TJ = TA + (PD • 110°C/W)
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 4: In applications where RSENSE is placed at ground potential, the
off time increases by approximately 40%.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
100
95
90
85
80
75
70
0.01
VIN = 5V
VIN = 9V
VIN = 12V
LTC1265-3.3
VOUT = 3.3V
RSENSE = 0.1Ω
CT = 130pF
COIL = CTX33-4
0.10
LOAD CURRENT (A)
1.00
1265 G01
Operating Frequency
vs (VIN – VOUT)
1.2
1.0
0°C
25°C
0.8
70°C
0.6
0.4
0.2
0
0 1 2 3 4 5 6 7 8 9 10
(VIN – VOUT) VOLTAGE (V)
1265 G04
Efficiency vs Input Voltage
(VOUT = 5V)
100
98
96
ILOAD = 250mA
94
92
ILOAD = 800mA
90
88
86
LTC1265-5
84 RSENSE = 0.1Ω
82 CT = 130pF
COIL = CTX33-4
80
4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
1265 G02
Switch Resistance
0.9
0.8
0.7
0.6
TJ = 125°C
0.5
TJ = 70°C
0.4
0.3
TJ = 25°C
0.2
TJ = 0°C
0.1
0
3 4 5 6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
1265 G05
Efficiency vs Input Voltage
(VOUT = 3.3V)
100
LTC1265-3.3
98 RSENSE = 0.1Ω
96 CT = 130pF
COIL = CTX33-4
94
92
ILOAD = 250mA
90
88
86
ILOAD = 800mA
84
82
80
45
6 7 8 9 10 11 12 13
INPUT VOLTAGE (V)
LTC1265 G03
Switch Leakage Current
300
VIN = 12V
270
240
210
180
150
120
90
60
30
0
0
20
40
60
80 100
TEMPERATURE (°C)
1265 G06
3
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