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LTC3860_15 Datasheet, PDF (3/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing
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LTC3860
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = VCLKIN = 0V, VFB = 0.6V,
fOSC = 0.6MHz unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ISS
tSS(INTERNAL)
VFB
Soft-Start Pin Output Current
Internal Soft-Start Time
Regulated Feedback Voltage
VSS = 0V
0°C to 85°C
–40°C to 85°C
–40°C to 125°C
2.5
μA
2
ms
595.5 600 604.5
mV
594
600
606
mV
l 592.5 600 607.5
mV
ΔVFB/ΔVCC
Regulated Feedback Voltage Line
Dependence
3.0V < VCC < 5.5V
0.05 0.2
%/V
ILIMIT
Power Good
ILIM Pin Output Current
VILIM = 0.8V
18
20
22
μA
VFB(OV)
PGOOD/VFB Overvoltage Threshold
VFB(UV)
PGOOD/VFB Undervoltage Threshold
VPGOOD(ON) PGOOD Pull-Down Resistance
Error Amplifier
VFB Falling
VFB Rising
VFB Falling
VFB Rising
645
mV
650
660
670
mV
530
540
550
mV
555
mV
15
60
Ω
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
75
dB
45
V/μs
f0dB
COMP Unity-Gain Bandwidth
Differential Amplifier
20
MHz
AV
Differential Amplifier Voltage Gain
VVSNSN = 0V
VOS
Input Referred Offset
VVSNSN = 0V
SR
Slew Rate
l 1.007
1
0.993
V/V
–2
2
mV
45
V/μs
f0dB
Bandwidth
VOUT(MAX)
Maximum Output Voltage
Current Sense Amplifier
20
MHz
4
V
VISENSE(MAX)
AV(ISENSE)
VCM(ISENSE)
IISENSE
VOS
Maximum Differential Current Sense
Voltage (VISNSP-VISNSN)
Voltage Gain
Input Common Mode Range
SENSE Pin Input Current
Current Sense Input Referred Offset
VCM = 1.5V
0°C to 125°C
–40°C to 125°C
50
mV
18.5
V/V
–0.3
VCC + 0.1
V
100
nA
–2
l –2.2
2
mV
2.2
mV
Oscillator and Phase-Locked Loop
fOSC
Oscillator Frequency
VCLKIN = 0V
VFREQ = 0V
VFREQ = 5V
VCLKIN = 5V
RFREQ < 24.9k
RFREQ = 30.1k
RFREQ = 54.9k
RFREQ = 75.0k
Maximum Frequency
Minimum Frequency
l 360
400
440
kHz
l 540
600
660
kHz
200
kHz
300
kHz
800
kHz
1.2
MHz
1.25
MHz
0.25
MHz
3860fc
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