LT1270ACT Linear Technology, LT1270ACT Datasheet - Page 3

• Manufacturer Part Number: LT1270ACT
• Description: IC SW-REG 10A HI-EFF TO220-5
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Inverting, Flybackr

Specifications of LT1270ACT

• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 10A
• Frequency - Switching: 60kHz
• Voltage - Input: 3.5 ~ 30 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Power - Output: -
• Internal Switch(s): -

TYPICAL APPLICATIO S
ELECTRICAL C
SYMBOL
I
f
DC
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Measured with V
Note 3: For duty cycles (DC) between 50% and 80%, minimum guaranteed
TYPICAL PERFOR A CE CHARACTERISTICS
ture range, otherwise specifications are at T
LIM
I
I
SW
IN
MAX
PARAMETER
Switch Current Limit (LT1270A)
(Note 4)
Supply Current Increase
During Switch-ON Time
Switching Frequency
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode Threshold Voltage
24
18
12
0
6
0
Switch Current Limit vs Duty Cycle
–55 C
C
125 C
20
in Hi Clamp, V
HARA TERISTICS
DUTY CYCLE (%)
40
W
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However,
no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the
interconnection of circuits as described herein will not infringe on existing patent rights.
FB
C
25 C
60
= 0.8V.
U
U
80
A
LT1270 • TA03
= 25 C. V
CONDITIONS
Duty Cycle = 50%, T
Duty Cycle = 80%, T
3V V
3V V
100
IN
IN
PULSE ENGINEERING #PE-92116
Boost Converter (5V to 12V)
IN
V
V
GND
MAX
MAX
= 15V, V
The
LT1270
V
5V
, V
IN
C
V
J
J
C
55 H*
= 0.05V
V
+
1k
denotes specifications which apply over the full operating tempera-
SW
FB
C
1 F
100 C
100 C
= 0.5V, V
switch current is given by I
8.33 (1.7 – DC) for the LT1270A.
Note 4: Minimum current limit is reduced by 0.5A at 125 C. 100 C test
limits are guaranteed by correlation to 125 C tests.
10.7k
1.24k
MBR1020
+
LT1270 • TA05
FB
1000 F
25V
12V, 2A
= V
1.6
1.2
0.8
0.4
0
REF
Switch Saturation Voltage
0
T
, switch pin open, unless otherwise noted.
J
= 25°C
10.0
MIN
2
100
7.5
50
50
80
50
LIM
SWITCH CURRENT (A)
= 6.67 (1.7 – DC) for the LT1270 and I
4
LT1270A/LT1270
TYP
100
150
1.5
25
60
92
6
8
LT1270 • TA04
MAX
16.0
14.0
400
250
300
40
70
70
95
10
UNITS
1270afc
mA/A
LIM
3
kHz
kHz
mV
mV
%
A
A
A
=
s