LTC3785-1(RevA) 查看數據表（PDF） - Linear Technology
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LTC3785-1 Datasheet PDF : 20 Pages
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LTC3785-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = ISVOUT = VDRV = VBST1 = VBST2 = 3.6V, RT = 49.9k, RILSET = 59k.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Regulator
VCC Maximum Regulating Voltage
VCC Regulation Voltage
VCC Regulator Sink Current
Run/Soft-Start
VIN = 5V, IVCC = –20mA
VIN = 3.6V, IVCC = –20mA
ISVOUT = VCC = 5V
l 4.15 4.35 4.55
V
l 3.3
3.5
3.6
V
800
μA
RUN/SS Threshold
When IC is Enabled
When EA is at Maximum Boost Duty Cycle
l 0.35
0.7
1.1
V
1.9
V
RUN/SS Input Current
RUN/SS = 0V
–1
μA
RUN/SS Discharge Current
During Current Limit
20
30
μA
Current Limit
Current Limit Sense Threshold
Reverse Current Limit Sense Threshold
Input Current
CCM Input Threshold (High)
ISVIN to ISSW1, RILSET = 121k
ISVIN to ISSW1, RILSET = 59k
ISSW2 to ISVOUT, CCM > 2V
ISSW2 to ISVOUT, CCM < 0.4V
ISVIN
ISVOUT
ISSW1, ISSW2
l 20
60
100
mV
l 55
105
155
mV
l –50 –110 –170
mV
l
–15
–35
mV
80
150
μA
10
20
μA
0.1
5
μA
l 2.2
V
CCM Input Threshold (Low)
l
0.4
V
CCM Input Current
CMM = 3.6V
0.01
1
μA
Burst Mode Operation
Mode Threshold
l 0.8
1.5
2.2
V
Mode Input Current
0.01
1
μA
tON Time
Oscillator
1.4
μs
Frequency Accuracy
l 370
509
650
kHz
Switching Characteristics
Maximum Duty Cycle
Boost (% Switch BG2 On)
Buck (% Switch TG1 On)
l 80
90
%
99
%
TG1, TG2 Driver Impedance
2
Ω
BG1, BG2 Driver Impedance
2
Ω
TG1, TG2 Rise Time
BG1, BG2 Rise Time
TG1, TG2 Fall Time
BG1, BG2 Fall Time
Buck Driver Nonoverlap Time
CLOAD = 3300pF (Note 3)
CLOAD = 3300pF (Note 3)
CLOAD = 3300pF (Note 3)
CLOAD = 3300pF (Note 3)
TG1 to BG1
20
ns
20
ns
20
ns
20
ns
100
ns
Boost Driver Nonoverlap Time
TG2 to BG2
100
ns
Power Good
Undervoltage Threshold
Undervoltage Hysteresis
VSENSE Falling, % Below FB Regulation Voltage
–5
–7.5 –10.5
%
1.5
%
Overvoltage Threshold
VSENSE Rising % Above FB Regulation Voltage,
MODE = 0V
5
7.5
10.5
%
Overvoltage Hysteresis
–2
%
37851fa
3
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