lt3663 Linear Technology Corporation, lt3663 Datasheet - Page 3

• Manufacturer Part Number: lt3663
• Description: 1.2a, 1.5mhz Step-down Switching Regulator With Output Current Limit
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
FB Bias Current
Switch Peak Current Limit
Switch V
Minimum BOOST Voltage
Boost Diode Drop
Boost Pin Current
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Absolute Maximum Voltage at V
nonrepetitive 1 second transients.
Note 3: The LT3663E is guaranteed to meet performance specifi cations
from 0°C to 125°C. Specifi cations over the –40°C to 125°C operating
temperature range are assured by design, characterization, and correlation
TYPICAL PERFORMANCE CHARACTERISTICS
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
–50
CESAT
V
IN
Undervoltage Lockout
–25
0
TEMPERATURE (°C)
25
FALLING
RISING
50
75
IN
100
and RUN pins is 60V for
3663 G03
125
CONDITIONS
V
(Note 5)
I
I
I
I
SW
SW
DIODE
SW
42
41
40
39
38
37
36
35
34
33
32
FB
–50
A
= 0.8V
= 1A
= 1A (Note 6)
= 1A
V
= 25°C. V
IN
= 60mA
–25
Overvoltage Lockout
The
0
TEMPERATURE (°C)
l
IN
denotes the specifi cations which apply over the full operating
= 12V, V
FALLING
25
RISING
with statistical process controls. The LT3663I specifi cations are
guaranteed over the full –40°C to 125°C temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 4: Current fl ows into pin.
Note 5: Switch Peak Current Limit guaranteed by design and/or correlation
to static test.
Note 6: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
50
BOOST
75
= 17V, V
100
3663 G06
T
A
125
= 25°C, unless otherwise noted.
SW
l
= 0V, R
800
700
600
500
400
300
200
100
MIN
0
1.6
ILIM
0
V
V
IN
RUN
= 36.5k unless otherwise noted.
Shutdown Current
= 0V
10
1.85
TYP
275
0.9
50
28
2
20
V
IN
VOLTAGE (V)
30
MAX
LT3663
150
2.5
2.2
1.2
40
50
UNITS
3663 G08
3663fa
3
mV
mA
60
nA
A
V
V