LT8471 View Datasheet(PDF) - Linear Technology
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LT8471 Datasheet PDF : 34 Pages
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LT8471
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 5V, unless otherwise noted (Note 2).
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage (VIN1, VIN2)
Quiescent Current (VIN1, Skyhook Disabled)
Quiescent Current (VIN1, Skyhook Enabled)
Quiescent Current (VIN2)
Quiescent Current in Shutdown (VIN1 + VIN2)
Positive Feedback Voltage (FB1, FB2)
VOV/UV = 1.3V, Not Switching
VOV/UV = 1.3V, C3 = 5V, Not Switching
VOV/UV = 1.3V, Not Switching
VOV/UV = 0V
l 2.6
50
V
2.2
3.3
mA
2.4
4
mA
29
42
µA
0.01
1
μA
l 773
789
805
mV
Negative Feedback Voltage
(FB1, FB2)
(LT8471E,I)
(LT8471H)
l –806 –788 –770
mV
l –806 –788 –767
mV
Feedback Pin Bias Current (FB1, FB2)
Error Amp Transconductances
VFB = Positive Feedback Voltage, Current Out of Pin
VFB = Negative Feedback Voltage
Primary Channels, ∆I = 2μA
30
–100
0
70
200
nA
100
nA
μmhos
Error Amp Voltage Gains
Primary Channels
95
V/ V
Reference Line Regulation
Switching Frequency, fOSC
Switching Frequency in Foldback
Switching Frequency Range
2.6V ≤ VIN1 ≤ 50V
RT = 46.4k
RT = 732k
All Channels. Compared to Normal fOSC
Synchronizing
0.008 0.05
%/ V
l 1.55
1.8
2.05
MHz
l 100
117
135
kHz
1/8
Ratio
l 100
2000
kHz
SYNC High Level for Sync
l 1.3
V
SYNC Low Level for Sync
l
0.4
V
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio fSYNC/fOSC
Switching Phase Between Primary Channels
Skyhook Boost Voltage
Minimum Switch Off-Time
VSYNC = 0V to 2V
RT = 46.4k
RT = 732k
VSHOUT – VC2, Skyhook Enabled
Primary Channels (Note 7)
Skyhook Channel (Note 7)
35
65
%
¾
Ratio
170
200
Deg
170
200
Deg
3.0
4.25
5.4
V
170
ns
100
ns
Minimum Switch On-Time
Primary Channels(Note 7)
Skyhook Channel (Note 7)
220
ns
30
ns
Switch Current Limit (Primary Channels)
Minimum Duty Cycle (Note 3)
Maximum Duty Cycle (Notes 3, 4)
l 2.1
2.55
3.2
A
l 1.35
1.8
2.5
A
Switch Current Limit (Skyhook)
(Note 3)
l 400
500
600
mA
Primary Switches VCESAT
Skyhook Switch VCESAT
C1, C2 Leakage Current
IC1 or IC2 = 1.5A
IC3 = 250mA
VC1 = VC2 = 12V, VE1 = VE2 = 0V, VOV/UV = 0V,
Current into Pin
300
mV
250
mV
0.01
1
μA
C3 Leakage Current
E1, E2 Leakage Current
Schottky Reverse Leakage
VC3 = 12V, VOV/UV = 0V
VOV/UV = 0V, Current Out of Pin
VC1 = VC2 = 20V, VE1 = VE2 = 5V
VC1 = VC2 = 5V, VE1 = VE2 = –10V
VREVERSE = 12V
VREVERSE = 50V
0.01
1
μA
0.01
1
µA
0.01
1
µA
0.01
1
µA
0.02
2
µA
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