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| LTC3862 Datasheet, PDF (3/40 Pages) Linear Technology – Multi-Phase Current Mode Step-Up DC/DC Controller | |||
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LTC3862
ELECTRICAL CHARACTERISTICS (Notes 2, 3) The l denotes the speciï¬cations which apply over the full
operating junction temperature range, otherwise speciï¬cations are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply Input and INTVCC Linear Regulator
VIN
VIN Supply Voltage Range
IVIN
VIN Supply Current
Normal Mode, No Switching
Shutdown
INTVCC
dVINTVCC(LINE)
dVINTVCC(LOAD)
VUVLO
LDO Regulator Output Voltage
Line Regulation
Load Regulation
INTVCC UVLO Voltage
3V8
LDO Regulator Output Voltage
(Note 5)
VRUN = 0V
6V < VIN < 36V
Load = 0mA to 20mA
Rising INTVCC
Falling INTVCC
4
36
V
l
1.8
3.0
mA
l
30
80
μA
4.8
5.0
5.2
V
0.002 0.02
%/V
â2
%
3.3
V
2.9
V
3.8
V
Switcher Control Loop
VFB
Reference Voltage
VITH = 0.8V (Note 6) E-Grade (Note 3) l 1.210 1.223 1.235
V
I-Grade and H-Grade (Note 3) l 1.199 1.223 1.248
V
dVFB/dVIN
dVFB/dVITH
gm
f0dB
Feedback Voltage VIN Line Regulation
Feedback Voltage Load Regulation
Transconductance Ampliï¬er Gain
Error Ampliï¬er Unity-Gain Crossover
Frequency
VIN = 4V to 36V (Note 6)
VITH = 0.5V to 1.2V (Note 6)
VITH = 0.8V (Note 6), ITH Pin Load = ±5μA
(Note 7)
±0.002 0.01
0.01
0.1
660
1.8
%/V
%
μMho
MHz
VITH
Error Ampliï¬er Maximum Output Voltage VFB = 1V, No Load
(Internally Clamped)
2.7
V
Error Ampliï¬er Minimum Output Voltage VFB = 1.5V, No Load
IITH
Error Ampliï¬er Output Source Current
Error Ampliï¬er Output Sink Current
50
mV
â30
μA
30
μA
IFB
VITH(PSKIP)
Error Ampliï¬er Input Bias Currents
Pulse Skip Mode Operation ITH Pin Voltage
(Note 6)
Rising ITH Voltage (Note 6)
Hysteresis
â50 â200
nA
0.275
V
25
mV
ISENSE(ON)
VSENSE(MAX)
SENSE Pin Current
Maximum Current Sense Input Threshold
VSLOPE = Float, Low Duty Cycle
(Note 3)
0.01
2
μA
65
75
85
mV
l 60
75
90
mV
VSENSE(MATCH) CH1 to CH2 Maximum Current Sense
Threshold Matching
RUN/Soft-Start
VSLOPE = Float, Low Duty Cycle (Note 3) l â10
(VSENSE1 â VSENSE2)
10
mV
IRUN
VRUN
VRUNHYS
ISS
RSS
Oscillator
RUN Source Current
High Level RUN Channel Enable Threshold
RUN Threshold Hysteresis
SS Pull-Up Current
SS Pull-Down Resistance
VRUN = 0V
VRUN = 1.5V
VSS = 0V
VRUN = 0V
â0.5
μA
â5
μA
1.22
V
80
mV
â5
μA
10
kΩ
fOSC
Oscillator Frequency
Oscillator Frequency Range
RFREQ = 45.6k
RFREQ = 45.6k
280
300
320
kHz
l 260
300
340
kHz
l 75
500
kHz
VFREQ
Nominal FREQ Pin Voltage
RFREQ = 45.6k
1.223
V
3862fb
3
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