LT3682 LINER [Linear Technology], LT3682 Datasheet - Page 3

• Manufacturer Part Number: LT3682
• Description: 1A Micropower Step-Down
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
range, otherwise specifi cations are at T
PARAMETER
V
V
V
V
V
Switching Frequency
Minimum Switch Off-Time
Switch Current Limit (Note 7)
Switch V
DA Pin Current to Stop OSC
Switch Leakage Current
Boost Schottky Diode Voltage Drop
Boost Schottky Diode Reverse Leakage
Minimum Boost Voltage (Note 5)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
PG Leakage Current
PG Sink Current
PG Threshold as % of V
PG Threshold Hysteresis
SYNC Threshold Voltage
SYNC Input Frequency
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 the device
reliability and lifetime.
Note 2: Absolute Maximum Voltage at V
nonrepetitive 1 second transients, and 36V for continuous operation.
Note 3: The LT3682E is guaranteed to meet performance specifi cations from
0°C to 125°C junction temperature. Specifi cations over the −40°C to 125°C
operating junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LT3682I is guaranteed
over the full −40°C to 125°C operating junction temperature range.
C
C
C
C
C
Source Current
Sink Current
Pin to Switch Current Gain
Switching Threshold
Clamp Voltage
CESAT
FB
IN
and RUN/SS pins is 60V for
A
= 25°C, V
CONDITIONS
R
R
R
SYNC = 0V
SYNC = 3.3V or Clocked
I
V
I
V
I
V
V
V
Measured at FB pin. FB Pin Voltage Rising
Measured at FB Pin
SW
BSD
SW
SW
SW
RUN/SS
PG
PG
RT
RT
RT
= 1A
= 0.5A
= 8.06kΩ
= 29.4kΩ
= 158kΩ
= 5V
= 0.4V
IN
= 0V, V
= 50mA
= 10V, V
= 10V, V
= 10V
The
IN
BD
= 60V
= 0
l
RUN
denotes specifi cations which apply over the full operating temperature
/SS = 10V, V
Note 4: Bias current fl ows out of the FB pin.
Note 5: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 6: This IC includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when over-temperature protection is active. Continuous operation above
the specifi ed maximum operating junction temperature may impair device
reliability.
Note 7: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycles.
BD
= 3.3V unless otherwise noted. (Note 3)
l
l
l
1.98
1.45
1.18
1.25
88%
MIN
225
100
300
0.5
0.9
2.5
0.3
1000
90%
1.25
0.01
10.5
TYP
250
130
460
720
550
0.6
2.2
1.7
1.4
1.6
0.1
1.7
0.1
50
50
12
12
2
1
LT3682
MAX
92%
2.42
1.66
1.95
17.5
275
210
850
800
0.7
1.1
2.5
0.2
2.2
20
2
1
1
1
UNITS
3
MHz
MHz
MHz
3682f
A/V
kHz
mV
mV
mA
mV
mV
μA
μA
μA
μA
μA
μA
μA
ns
V
V
A
A
A
V
V
V
V