lt3980 Linear Technology Corporation, lt3980 Datasheet - Page 3

• Manufacturer Part Number: lt3980
• Description: 58v, 2a, 2.4mhz Step-down Switching Regulator With 85?a Quiescent Current
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
noted. (Note 2)
PARAMETER
Quiescent Current from BD
Feedback Voltage
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp g
Error Amp Gain
V
V
V
V
Switching Frequency
Minimum Switch Off-Time
Switch Current Limit
Switch V
DA Pin Current to Pause OSC
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
PG Threshold Offset from Feedback Voltage
PG Hysteresis
PG Leakage
PG Sink Current
SYNC Threshold
SYNC Pin Bias 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: The LT3980E 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
with statistical process controls. The LT3980I specifi cations are
guaranteed over the –40°C to 125°C temperature range.The LT3980H
C
C
C
C
Source Current
Sink Current
Pin to Switch Current Gain
Clamp Voltage
CESAT
m
CONDITIONS
V
V
V
V
4V < V
R
R
R
Duty Cycle = 5%
I
V
I
V
V
V
V
V
SW
SW
RUN/SS
BD
BD
FB
BD
RUN/SS
FB
PG
PG
SYNC
T
T
T
= 8.66k
= 29.4k
= 187k
= 0.8V, V
= 2A
= 2A
Rising
A
= 3V, Not Switching
= 0, Not Switching
= 0V
= 5V
= 0.4V
= 25°C. V
IN
= 0V
= 2.5V
= 0.2V
< 56V
The
C
= 1.2V
●
IN
denotes the specifi cations which apply over the full operating
= 10V, V
specifi cations are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degade operating lifetimes.
Operating lifetime is derated at junction temperatures greater than 125°C.
Note 3: Bias current fl ows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: Absolute Maximum at V
repetitive 1 minute transients, and 60V for continuous operation.
RUN/SS
= 10V, V
BOOST
= 15V, V
●
●
●
●
●
●
●
IN
and RUN/SS pins is 80V for non-
0.575
1.95
0.86
MIN
77O
782
195
200
3.3
1.9
0.4
55
50
BD
= 3.3V unless otherwise
0.002
0.675
1800
0.01
3.87
2.25
1.07
0.02
TYP
790
790
500
225
140
540
700
2.4
1.7
0.1
0.1
82
10
60
60
40
65
14
1
2
4
6
LT3980
0.775
MAX
0.01
2.55
1.27
115
798
805
255
230
0.5
4.9
2.2
2.5
40
55
10
80
5
3
2
1
UNITS
μmho
3
3980f
MHz
MHz
%/V
kHz
A/V
mV
mV
mV
mA
mV
mV
μA
μA
μA
nA
μA
μA
nS
μA
μA
μA
μA
μA
V
A
A
V
V
V
V