lt3680 Linear Technology Corporation, lt3680 Datasheet - Page 3

• Manufacturer Part Number: lt3680
• Description: 36v, 3.5a, 2.4mhz Step-down Switching Regulator With 75?a Quiescent Current
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
noted. (Note 2)
PARAMETER
Minimum Bias Voltage (BD Pin)
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
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 Low Threshold
SYNC High 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 LT3680E 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 LT3680I specifi cations are
guaranteed over the –40°C to 125°C temperature range.
C
C
C
C
Source Current
Sink Current
Pin to Switch Current Gain
Clamp Voltage
CESAT
m
CONDITIONS
V
V
4V < V
R
R
R
Duty Cycle = 5%
I
V
I
V
V
V
V
V
SW
SW
BD
FB
SW
RUN/SS
FB
PG
PG
SYNC
T
T
T
= 8.66k
= 29.4k
= 187k
= 0.8V, V
= 3.5A
= 1A
Rising
A
= 0, Not Switching
= 5V
= 0.4V
= 10V, V
= 25°C. V
IN
= 0V
= 2.5V
< 38V
The
C
BD
= 0.4V
= 0V
●
IN
denotes the specifi cations which apply over the full operating
= 10V, V
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.
RUN/SS
= 10V V
BOOST
= 15V, V
●
●
●
●
●
MIN
780
775
200
200
BD
2.2
1.0
4.6
0.2
0.5
= 3.3V unless otherwise
0.002
2000
2.45
0.02
TYP
790
790
500
230
335
800
2.7
5.3
2.0
1.1
5.4
1.5
0.1
0.1
10
60
60
60
35
65
10
1
5
LT3680
MAX
0.01
1.25
800
805
260
150
2.7
6.0
2.0
2.5
0.7
40
50
5
3
2
8
1
UNITS
μMho
3
3680f
MHz
MHz
%/V
kHz
A/V
mV
mV
mV
mA
mV
mV
μA
nA
μA
μA
nS
μA
μA
μA
μA
μA
V
V
A
V
V
V
V
V