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LTC3867_15 Datasheet, PDF (3/36 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller
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LTC3867
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop/Whole System
VIN
VOUT
VFB
IFB
VREFLNREG
VLOADREG
gm
VOVL
IQ
DFMAX
UVLO
UVLOHYS
ISENSE
ITEMP
IFAST
ITK/SS
VRUN
VRUN(HYS)
IRUN
Input Voltage Range
Output Voltage Range
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier gm
Feedback Overvoltage Lockout
Input DC Supply Current
Normal Mode
Shutdown
Maximum Duty Factor
Undervoltage Lockout
UVLO Hysteresis
Sense Pin Bias Currents
DCR Tempco Compensation Current
Fast Transient Programming Current
Soft-Start Charge Current
RUN Pin On Threshold
RUN Pin On Hysteresis
RUN Pin Pull-Up Current
RUN < On Threshold
RUN > On Threshold
ITH =1.2V, 0°C to 85°C
ITH =1.2V, –40°C to 125°C (Note 3)
VIN = 4.5V to 38V
ΔITH =1.2V to 0.7V
ΔITH =1.2V to 1.6V
ITH =1.2V, Sink/Source 5µA
Measured at VFB
VRUN = 0V (Note 4)
In Dropout, fSW = 600kHz
VINTVCC Falling
VSENSE = 3.3V
VITEMP = 500mV
VIFAST = 500mV
VTK/SS = 0V
VRUN Rising
RUN < 1.1V
RUN > 1.34V
4
0.6
595.5
l 594
l
l
l
5
96
3.0
l
l 27
l
9
1
l 1.1
600
600
–15
0.002
0.01
–0.01
2
7.5
3.5
30
98
3.2
600
±1
30
10
1.25
1.22
80
1
5
38
14
604.5
606
–50
0.02
0.1
–0.1
10
50
3.4
±2
33
11
1.4
1.34
V
V
mV
mV
nA
%/V
%
%
mmho
%
mA
µA
%
V
mV
µA
µA
µA
µA
V
mV
µA
µA
VSENSE(MAX) Maximum Current Sense Threshold
tON(MIN)
Minimum On-Time
Power Good
ITH =1.85V, VSENSE =3.3V
ILIM = 0V
ILIM = 1.5V
ILIM = Float
ILIM = 3.7V
ILIM = INTVCC
(Note 6)
l 25
30
35
mV
l 35
40
45
mV
l 45
50
55
mV
l 55
60
65
mV
l 69
75
79
mV
65
ns
VPGOOD(ON)
IPGOOD(OFF)
tPGOOD
VPG1
PGOOD Pull-Down Resistance
PGOOD Leakage Current
PGOOD Delay
PGOOD Trip Level—with Delay
VPGOOD = 5V
VPGOOD High to Low
VFB with Respect to Set Output Voltage
VFB Ramping Up
VFB Ramping Down
90
200
Ω
–2
2
µA
45
µs
5
7.5
10
%
–5
–7.5
–10
%
3867f
3
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