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LT3680 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3680
Description  36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75關A Quiescent Current
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3680 Datasheet(HTML) 3 Page - Linear Technology

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LT3680
3
3680fa
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VBD = 0, Not Switching
15
μA
Minimum Bias Voltage (BD Pin)
2.7
3
V
Feedback Voltage
●
780
775
790
790
800
805
mV
mV
FB Pin Bias Current (Note 3)
VFB = 0.8V, VC = 0.4V
●
10
40
nA
FB Voltage Line Regulation
4V < VIN < 36V
0.002
0.01
%/V
Error Amp gm
500
μMho
Error Amp Gain
2000
VC Source Current
60
μA
VC Sink Current
60
μA
VC Pin to Switch Current Gain
5.3
A/V
VC Clamp Voltage
2.0
V
Switching Frequency
RT = 8.66k
RT = 29.4k
RT = 187k
2.2
1.0
200
2.45
1.1
230
2.7
1.25
260
MHz
MHz
kHz
Minimum Switch Off-Time
●
60
150
nS
Switch Current Limit
Duty Cycle = 5%
4.6
5.4
6.0
A
Switch VCESAT
ISW = 3.5A
335
mV
Boost Schottky Reverse Leakage
VBOOST = 10V, VBD = 0V
0.02
2
μA
Minimum Boost Voltage (Note 4)
●
1.5
2.0
V
BOOST Pin Current
ISW = 1A
35
50
mA
RUN/SS Pin Current
VRUN/SS = 2.5V
5
8
μA
RUN/SS Input Voltage High
2.5
V
RUN/SS Input Voltage Low
0.2
V
PG Threshold Offset from Feedback Voltage
VFB Rising
65
mV
PG Hysteresis
10
mV
PG Leakage
VPG = 5V
0.1
1
μA
PG Sink Current
VPG = 0.4V
●
200
800
μA
SYNC Low Threshold
0.5
V
SYNC High Threshold
0.7
V
SYNC Pin Bias Current
VSYNC = 0V
0.1
μA
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 specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3680I specifications are
guaranteed over the –40°C to 125°C temperature range.
Note 3: Bias current flows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V VBOOST = 15V, VBD = 3.3V unless otherwise
noted. (Note 2)
ELECTRICAL CHARACTERISTICS



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