LT3680H Просмотр технического описания (PDF) - Linear Technology
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LT3680H Datasheet PDF : 24 Pages
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LT3680
ELECTRICAL CHARACTERISTICS 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)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Input Voltage
●
3
3.6
V
Quiescent Current from VIN
Quiescent Current from BD
Minimum Bias Voltage (BD Pin)
VRUN/SS = 0.2V
VBD = 3V, Not Switching
VBD = 0, Not Switching
VRUN/SS = 0.2V
VBD = 3V, Not Switching
VBD = 0, Not Switching
0.01 0.5
μA
●
30
65
μA
120 160
μA
0.01 0.5
μA
●
90
130
μA
1
5
μA
2.7
3
V
Feedback Voltage
780
790
800
mV
● 775
790
805
mV
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp gm
Error Amp Gain
VFB = 0.8V, VC = 0.4V
4V < VIN < 36V
●
10
40
nA
0.002 0.01
%/V
500
μMho
2000
VC Source Current
VC Sink Current
VC Pin to Switch Current Gain
VC Clamp Voltage
Switching Frequency
Minimum Switch Off-Time
RT = 8.66k
RT = 29.4k
RT = 187k
60
μA
60
μA
5.3
A/V
2.0
V
2.2
2.45
2.7
MHz
1.0
1.1 1.25
MHz
200
230
260
kHz
●
60
150
nS
Switch Current Limit
Duty Cycle = 5%
4.6
5.4
6.0
A
Switch VCESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
ISW = 3.5A
VBOOST = 10V, VBD = 0V
335
mV
0.02
2
μA
●
1.5
2.0
V
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
ISW = 1A
VRUN/SS = 2.5V
35
50
mA
5
8
μA
2.5
V
RUN/SS Input Voltage Low
0.2
V
PG Threshold Offset from Feedback Voltage
PG Hysteresis
VFB Rising
65
mV
10
mV
PG Leakage
PG Sink Current
SYNC Low Threshold
VPG = 5V
VPG = 0.4V
0.1
1
μA
● 200
800
μA
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.
guaranteed over the –40°C to 125°C temperature range. The LT3680H
specifications are guaranteed over the –40°C to 150°C operating
temerature range. High junction temperatures degrade operating lifetimes.
Operating lifetime is derated at junction temperatures greater than 125°C.
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
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.
3680fb
3
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