LT8705 Просмотр технического описания (PDF) - Linear Technology
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LT8705 Datasheet PDF : 44 Pages
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LT8705
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, SHDN = 3V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
CSPOUT, CSNOUT Bias Current
BOOST Capacitor Charge Control Block Not Active
ICSPOUT + ICSNOUT, VCSPOUT = VCSNOUT = 12V
ICSPOUT + ICSNOUT, VCSPOUT = VCSNOUT = 1.5V
45
µA
4
µA
CSPOUT, CSNOUT Common Mode Operating Voltage Range
l0
80
V
CSPOUT, CSNOUT Differential Mode Operating Voltage Range
l –100
100
mV
VCSPOUT-CSNOUT to IMON_OUT Amplifier A6 gm
IMON_OUT Maximum Output Current
VCSPOUT – VCSNOUT = 50mV, VCSPOUT = 5.052V
VCSPOUT – VCSNOUT = 50mV, VCSPOUT = 5.025V
VCSPOUT – VCSNOUT = 5mV, VCSPOUT = 5.0025V
VCSPOUT – VCSNOUT = 5mV, VCSPOUT = 5.0025V
0.95
l 0.94
0.65
l 0.55
l 100
1 1.05 mmho
1 1.085 mmho
1 1.35 mmho
1 1.6 mmho
µA
IMON_OUT Overvoltage Threshold
l 1.55 1.61 1.67
V
IMON_OUT Error Amp EA1 gm
IMON_OUT Error Amp EA1 Voltage Gain
185
µmho
130
V/V
SRVO_IIN Activation Threshold (Note 5)
SRVO_IIN Activation Threshold Hysteresis (Note 5)
SRVO_IOUT Activation Threshold (Note 5)
SRVO_IOUT Activation Threshold Hystersis (Note 5)
SRVO_IIN, SRVO_IOUT Low Voltage (Note 5)
(VIMON_IN Rising) – (Regulation Voltage for
IMON_IN), VFBIN = 3V, VFBOUT = 0V, VIMON_OUT = 0V
–60 –49 –37
mV
VFBIN = 3V, VFBOUT = 0V, VIMON_OUT = 0V
22
mV
(VIMON_OUT Rising) – (Regulation Voltage for IMON_
OUT), VFBIN = 3V, VFBOUT = 0V, VIMON_IN = 0V
–62 –51 –39
mV
VFBIN = 3V, VFBOUT = 0V, VIMON_IN = 0V
22
mV
I = 100μA
l
110 330
mV
SRVO_IIN, SRVO_IOUT Leakage Current (Note 5)
NMOS Gate Drivers
VSRVO_IIN = VSRVO_IOUT = 2.5V
l
0
1
µA
TG1, TG2 Rise Time
TG1, TG2 Fall Time
BG1, BG2 Rise Time
BG1, BG2 Fall Time
TG1 Off to BG1 On Delay
BG1 Off to TG1 On Delay
TG2 Off to BG2 On Delay
BG2 Off to TG2 On Delay
Minimum On-Time for Main Switch in Boost Operation
(tON(M3,MIN))
Minimum On-Time for Synchronous Switch in Buck
Operation (tON(M2,MIN))
Minimum Off-Time for Main Switch in Steady-State Boost
Operation
CLOAD = 3300pF (Note 4)
CLOAD = 3300pF (Note 4)
CLOAD = 3300pF (Note 4)
CLOAD = 3300pF (Note 4)
CLOAD = 3300pF Each Driver
CLOAD = 3300pF Each Driver
CLOAD = 3300pF Each Driver
CLOAD = 3300pF Each Driver
Switch M3, CLOAD = 3300pF
Switch M2, CLOAD = 3300pF
Switch M3, CLOAD = 3300pF
20
ns
20
ns
20
ns
20
ns
100
ns
80
ns
100
ns
80
ns
265
ns
260
ns
245
ns
Minimum Off-Time for Synchronous Switch in
Steady-State Buck Operation
Switch M2, CLOAD = 3300pF
245
ns
Oscillator
Switch Frequency Range
SYNCing or Free Running
100
400
kHz
Switching Frequency, fOSC
RT = 365k
RT = 215k
RT = 124K
l 102 120 142
kHz
l 170 202 235
kHz
l 310 350 400
kHz
8705p
For more information www.linear.com/8705
5
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