Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
3483fb
2
LT3483
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Range
V
IN
Undervoltage Lockout
FB Comparator Trip Voltage to GND (V
FB
)
FB Output Current (Note 3)
FB Comparator Hysteresis
Quiescent Current in Shutdown
Quiescent Current (Not Switching)
I
FB
Line Regulation
Switch Off-Time
Switch Current Limit
Switch V
CESAT
Switch Leakage Current
Rectifier Leakage Current
Rectifier Forward Drop
SHDN Input Low Voltage
SHDN Input High Voltage
SHDN 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.
1.5
6
10
I
SW
= 150mA to GND
SW = 40V
D = – 40V
I
D
= 150mA to GND
0.64
0.4
170
FB Falling
FB = V
FB
– 5mV
FB Rising
V
SHDN
= GND
FB = –0.05V
2.5V ≤ V
IN
≤ 16V
300
200
200
1
4
230
40
●
●
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, V
SHDN
= 3.6V unless otherwise specified.
CONDITIONS
MIN
2.5
2
0
–10.2
5
–10
10
1
50
0.07
TYP
MAX
16
2.4
12
–9.7
UNITS
V
V
mV
μA
mV
μA
μA
%/V
ns
mA
mV
μA
μA
V
V
V
μA
Note 2:
The LT3483E is guaranteed to meet specifications from 0°C to 85°C.
Specifications over the –40°C to 85°C operating temperature range are
assured by design, characterization and correlation with statistical process
controls. The LT3483I is guaranteed to meet specifications over the –40°C to
125°C operating temperature range.
Note 3:
Current flows out of the pin.
3483fb
3
LT3483
TYPICAL PERFORMANCE CHARACTERISTICS
V
FB
Current
10.2
16
V
FB
Voltage
400
350
SWITCH OFF TIME (ns)
–25
50
75
0
25
TEMPERATURE (°C)
100
125
Switch Off Time
10.1
V
FB
CURRENT (μA)
V
FB
VOLTAGE (mV)
12
300
250
200
150
100
50
10.0
8
9.9
4
9.8
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
125
0
–50
0
–50
–25
0
25
75
50
TEMPERATURE (°C)
100
125
3483 G01
3483 G02
3483 G03
Switch Current Limit
230
220
210
200
190
180
170
–50
QUIESCENT CURRENT (μA)
50
Quiescent Current
10
SHDN
PIN BIAS CURRENT (μA)
SHDN
Pin Bias Current
T
A
= 25°C
SWITCH CURRENT LIMIT (mA)
40
8
30
6
20
4
10
2
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
125
0
0
8
4
12
SHDN
PIN VOLTAGE (V)
16
3483 G06
3483 G04
3483 G05
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LT3483
PIN FUNCTIONS
(DFN/TSOT-23)
FB (Pin 1/Pin 3):
Feedback. Place resistor to negative
output here. Set resistor value R1 = V
OUT
/10μA.
GND (Pins 2, 3/Pin 2):
Ground. For DFN package, tie both
pin 2 and pin 3 together to ground.
SW (Pin 4/Pin 1):
Switch. Connect to external inductor
L1 and positive terminal of transfer capacitor.
V
IN
(Pin 5/Pin 6):
Input Supply. Must be locally bypassed
with 1μF or greater.
NC (Pin 6/NA):
No Connection.
D (Pin 7/Pin 5):
Anode Terminal of Integrated Schottky
Diode. Connect to negative terminal of transfer capaci-
tor and external inductor L2 (flyback configuration) or
to cathode of external Schottky diode (inverting charge
pump configuration).
SHDN
(Pin 8/Pin 4):
Shutdown. Connect to GND to turn
device off. Connect to supply to turn device on.
Exposed Pad (Pin 9/NA):
GND. The exposed pad should
be soldered to the PCB ground to achieve the rated thermal
嵌入式系统
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