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LTC1149CS-5 Datasheet Download

Part No.:
LTC1149CS-5
Download:
Download Datasheet
Description:
[High Efficiency Synchronous Step-Down Switching Regulators]
File Size:
393 K
Page:
20 Pages
Logo:
Manufacturer:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype
 LTC1149CS-5 Datasheet Page:1LTC1149CS-5 Datasheet Page:2LTC1149CS-5 Datasheet Page:4LTC1149CS-5 Datasheet Page:5LTC1149CS-5 Datasheet Page:6LTC1149CS-5 Datasheet Page:7LTC1149CS-5 Datasheet Page:8LTC1149CS-5 Datasheet Page:9 
LTC1149
LTC1149-3.3/LTC1149-5
ELECTRICAL CHARACTERISTICS
SYMBOL
V
9
– V
8
PARAMETER
Current Sense Threshold Voltage
LTC1149
LTC1149-3.3
LTC1149-5
V
10
V
15
I
15
I
6
t
OFF
t
r
, t
f
Shutdown 1 Threshold
LTC1149-3.3, LTC1149-5
Shutdown 2 Threshold
Shutdown 2 Input Current
C
T
Pin Discharge Current
Off-Time (Note 4)
Driver Output Transition Times
V
15
= 5V
T
A
= 25°C, V
IN
= 12V, V
10
= 0V (Note 2), unless otherwise noted.
MIN
TYP
25
150
25
150
25
150
0.8
1.4
18
50
4
70
2
5
100
MAX
UNITS
mV
mV
mV
mV
mV
mV
V
V
µA
µA
µA
µs
ns
CONDITIONS
V
8
= 5V, V
10
= 1.32V (Forced)
V
8
= V
OUT
– 100mV
V
8
= 3.5V (Forced)
V
8
= V
OUT
– 100mV
V
8
= 5.3V (Forced)
V
8
= V
OUT
– 100mV
q
q
q
130
130
130
0.5
0.8
170
170
170
2
2
25
90
10
6
200
V
OUT
In Regulation, V
SENSE–
= V
OUT
V
OUT
= 0V
C
T
= 390pF, I
LOAD
= 700mA
C
L
= 3000pF (Pins 4, 13), V
IN
= 6V
– 40°C
T
A
85°C (Note 5), unless otherwise noted.
SYMBOL
V
10
V
OUT
PARAMETER
Feedback Voltage LTC1149 Only
Regulated Output Voltage
LTC1149-3.3
LTC1149-5
Input DC Supply Current (Note 3)
Normal Mode
Burst Mode
Shutdown
V
CC
V
9
– V
8
V
15
t
OFF
Internal Regulator Voltage
(Sets MOSFET Gate Drive Levels)
Current Sense Threshold Voltage
Shutdown 2 Threshold
Off-Time (Note 4)
C
T
= 390pF, I
LOAD
= 700mA, V
IN
= 10V
V
IN
= 9V
I
LOAD
= 700mA
I
LOAD
= 700mA
V
IN
= 12V
V
IN
= 48V
V
IN
= 12V
V
IN
= 48V
V
IN
= 12V, V
15
= 2V
V
IN
= 48V, V
15
= 2V
V
IN
= 12V to 48V
I
3
= 20mA
Low Threshold (Forced)
High Threshold (Forced)
9.75
CONDITIONS
MIN
1.2
3.17
4.85
TYP
1.25
3.33
5.05
2.0
2.2
0.6
0.8
135
300
10.25
25
150
1.4
5
MAX
1.3
3.43
5.2
3.2
3.5
1.05
1.30
230
520
11
UNITS
V
V
V
mA
mA
mA
mA
µA
µA
V
mV
mV
V
µs
I
2
125
0.8
3.8
175
2
6
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
LTC1149CN, LTC1149CN-3.3, LTC1149CN-5: T
J
= T
A
+ (P
D
)(70°C/W)
LTC1149CS, LTC1149CS-3.3, LTC1149CS-5: T
J
= T
A
+ (P
D
)(110°C/W)
Note 2:
Pin 10 is a shutdown pin on the LTC1149-3.3 and LTC1149-5
fixed output voltage versions and must be at ground potential for testing.
Note 3:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. The allowable operating frequency
may be limited by power dissipation at high input voltages. See Typical
Performance Characteristics and Applications Information.
Note 4:
In applications where R
SENSE
is placed at ground potential, the off-
time increases approximately 40%.
Note 5:
The LTC1149, LTC1149-3.3, and LTC1149-5 are not tested and
not quality assurance sampled at – 40°C and 85°C. These specifications
are guaranteed by design and/or correlation.
3