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LTC1265CS Datasheet(PDF) 3 Page - Linear Technology

Part # LTC1265CS
Description  1.2A, High Efficiency Step-Down DC/DC Converter
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1265CS Datasheet(HTML) 3 Page - Linear Technology

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LTC1265/LTC1265-3.3/LTC1265-5
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%.
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)
TYPICAL PERFORMANCE CHARACTERISTICS
LOAD CURRENT (A)
0.01
70
75
80
85
90
100
0.10
1.00
1265 G01
95
VIN = 5V
VIN = 9V
VIN = 12V
LTC1265-3.3
VOUT = 3.3V
RSENSE = 0.1Ω
CT = 130pF
COIL = CTX33-4
INPUT VOLTAGE (V)
4
80
82
86
88
90
100
94
6
8
913
LTC1265 G03
84
96
98
92
57
10
11
12
ILOAD = 250mA
ILOAD = 800mA
LTC1265-3.3
RSENSE = 0.1Ω
CT = 130pF
COIL = CTX33-4
INPUT VOLTAGE (V)
4
80
82
86
88
90
100
94
6
8
913
1265 G02
84
96
98
92
57
10
11
12
ILOAD = 250mA
ILOAD = 800mA
LTC1265-5
RSENSE = 0.1Ω
CT = 130pF
COIL = CTX33-4
Switch Resistance
INPUT VOLTAGE (V)
3
0
0.1
0.3
0.4
0.5
7
11
13
0.9
1265 G05
0.2
59
6
10
12
48
0.6
0.7
0.8
TJ = 70°C
TJ = 125°C
TJ = 25°C
TJ = 0°C
(VIN – VOUT) VOLTAGE (V)
0
0.4
0.8
1.2
1.0
0.6
0.2
2
14
6
8
1265 G04
10
03
5
7
9
0
°C
25
°C
70
°C
Operating Frequency
vs (VIN – VOUT)
Efficiency vs Input Voltage
(VOUT = 3.3V)
Efficiency vs Input Voltage
(VOUT = 5V)
Efficiency vs Load Current
Switch Leakage Current
TEMPERATURE (
°C)
0
180
240
300
270
210
150
90
30
80
1265 G06
120
60
0
20
40
60
100
VIN = 12V
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIH
Shutdown Pin High
Min Voltage at Pin 10 for Device to be in Shutdown
1.2
V
VIL
Shutdown Pin Low
Max Voltage at Pin 10 for Device to be Active
0.6
V
I10
Shutdown Pin Input Current
VSHDN = 8V
0.5
µA
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.



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