LTC1265 LINER [Linear Technology], LTC1265 Datasheet - Page 3

• Manufacturer Part Number: LTC1265
• Description: 1.2A, High Efficiency Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

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