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LTC3861-1 Datasheet, PDF (3/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
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LTC3861-1
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TJ = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = 5V, VCLKIN = 0V,
VFB = 0.6V, fOSC = 0.6MHz, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VCC
IQ
VRUN
IRUN
VUVLO
ISS
tSS(INTERNAL)
VFB
VIN Range
VCC Voltage Range
Input Voltage Supply Current
Normal Operation
Shutdown Mode
UVLO
RUN Input Threshold
RUN Input Pull-Up Current
Undervoltage Lockout Threshold
Soft-Start Pin Output Current
Internal Soft-Start Time
Regulated Feedback Voltage
VCC = 5V
VRUN1,2 = 5V
VRUN1,2 = 0V
VCC < VUVLO
VRUN Rising
VRUN Hysteresis
VRUN1,2 = 2.4V
VCC Rising
VCC Hysteresis
VSS = 0V
–40°C to 85°C
–40°C to 125°C
l
3
l
3
24
V
5.5
V
18
mA
50
µA
6
mA
1.95 2.25 2.45
V
250
mV
1.5
µA
l
3.0
V
100
mV
2.5
µA
1.5
ms
595.5 600 604.5
mV
l 594
600
606
mV
∆VFB/∆VCC
ILIMIT
Power Good
Regulated Feedback Voltage Line Dependence 3.0V < VCC < 5.5V
ILIM Pin Output Current
VILIM = 0.8V
0.05
0.2
%/V
19
20
22
µA
VFB(OV)
PGOOD/VFB Overvoltage Threshold
VFB(UV)
PGOOD/VFB Undervoltage Threshold
VPGOOD(ON)
IPGOOD(OFF)
tPGOOD
Error Amplifier
PGOOD Pull-Down Resistance
PGOOD Leakage Current
PGOOD Delay
VFB Falling
VFB Rising
VFB Falling
VFB Rising
VPGOOD = 5V
VPGOOD High to Low
645
mV
650
660
670
mV
530
540
550
mV
555
mV
15
60
Ω
2
µA
30
µs
IFB
FB Pin Input Current
IOUT
COMP Pin Output Current
VFB = 600mV
Sourcing
Sinking
–100
100
nA
1
mA
5
mA
AV(OL)
SR
Open-Loop Voltage Gain
Slew Rate
(Note 4)
75
dB
45
V/µs
f0dB
COMP Unity-Gain Bandwidth
Differential Amplifier
AV
VOS
f0dB
IOUT(SINK)
IOUT(SOURCE)
Differential Amplifier Voltage Gain
Input Referred Offset
DA Unity-Gain Crossover Frequency
Maximum Sinking Current
Maximum Sourcing Current
VSNSOUT(MAX) Maximum Output Voltage
Current Sense Amplifier
(Note 4)
VVSNSN = 0V
VVSNSN = 0V
(Note 4)
DIFFOUT = 1.2V
DIFFOUT = 1.2V
40
MHz
l 1.007
1
0.993
V/V
–2
2
mV
40
MHz
100
µA
500
µA
4
V
VISENSE(MAX)
AV(ISENSE)
VCM(ISENSE)
Maximum Differential Current Sense Voltage
(VISNSP-VISNSN)
Voltage Gain
Input Common Mode Range
50
mV
18.5
V/V
–0.3
VCC – 0.5
V
38611f
3
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