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| LTC3859AL Datasheet, PDF (4/44 Pages) Linear Technology – Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ | |||
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LTC3859AL
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VBIAS = 12V, VRUN1,2,3 = 5V, EXTVCC = 0V unless otherwise
noted. (Note 2)
SYMBOL
IQ
PARAMETER
Input DC Supply Current
Pulse-Skipping or
Forced Continuous Mode
(One Channel On)
Pulse-Skipping or
Forced Continuous Mode
(All Channels On)
Sleep Mode
(One Channel On, Buck)
Sleep Mode
(One Channel On, Boost)
Sleep Mode
(Buck and Boost Channel On)
UVLO
VOVL1,2
ISENSE1,2+
ISENSE3+
ISENSE1,2â
Sleep Mode
(All Three Channels On)
Shutdown
Undervoltage Lockout
Buck Feedback Overvoltage Protection
SENSE+ Pin Current
SENSE+ Pin Current
SENSEâ Pin Current
ISENSE3â
SENSEâ Pin Current
DFMAX,TG
Maximum Duty Factor for TG
DFMAX,BG
Maximum Duty Factor for BG
ITRACK/SS1,2
Soft-Start Charge Current
ISS3
Soft-Start Charge Current
VRUN1 ON
VRUN2,3 ON
RUN1 Pin Threshold
RUN2,3 Pin Threshold
VRUN1,2,3 Hyst RUN Pin Hysteresis
VSENSE1,2,3(MAX) Maximum Current Sense Threshold
VSENSE3(CM)
SENSE3 Pins Common Mode Range
(BOOST Converter Input Supply Voltage)
CONDITIONS
(Note 5)
RUN1 = 5V and RUN2,3 = 0V or
RUN2 = 5V and RUN1,3 = 0V or
RUN3 = 5V and RUN1,2 = 0V
VFB1, 2 ON = 0.83V (No Load)
VFB3 = 1.25V
RUN1,2,3 = 5V,
VFB1,2 = 0.83V (No Load)
VFB3 = 1.25V
RUN1 = 5V and RUN2,3 = 0V or
RUN2 = 5V and RUN1,3 = 0V
VFB,ON = 0.83V (No Load)
RUN3 = 5V and RUN1,2 = 0V
VFB3 = 1.25V
RUN1 = 5V and RUN2 = 0V or
RUN2 = 5V and RUN1 = 0V
RUN3 = 5V
VFB1,2 = 0.83V (No Load)
VFB3 = 1.25V
RUN1,2,3 = 5V,
VFB1,2 = 0.83V (No Load)
VFB3 = 1.25V
RUN1,2,3 = 0V
INTVCC Ramping Up
INTVCC Ramping Down
Measured at VFB1,2 Relative to
Regulated VFB1,2
Bucks (Channels 1 and 2)
Boost (Channel 3)
Bucks (Channels 1 and 2)
VOUT1,2 < VINTVCC â 0.5V
VOUT1,2 > VINTVCC + 0.5V
Boost (Channel 3)
VSENSE3+, VSENSE3â = 12V
Bucks (Channels 1,2) in Dropout, FREQ = 0V
Boost (Channel 3) in Overvoltage
Bucks (Channels 1,2) in Overvoltage
Boost (Channel 3)
VTRACK/SS1,2 = 0V
VSS3 = 0V
VRUN1 Rising
VRUN2,3 Rising
VFB1,2 = 0.7V, VSENSE1,2â = 3.3V
VFB1,2,3 = 1.1V, VSENSE3+ = 12V
MIN TYP MAX UNITS
1.5
mA
3
mA
l
28 48
µA
l
35 59
33 53
µA
33 46
µA
40 59
38 56
µA
10 20
µA
l
4.15 4.5
V
l 3.5 3.8 4.0
V
7
10 13
%
±1
µA
170
µA
±2
µA
700
µA
±1
µA
98 99
%
100
%
100
%
96
%
3
5
8
µA
3
5
8
µA
l 1.18 1.24 1.32
V
l 1.21 1.27 1.33
V
70
mV
l 43
50
57
mV
2.5
38
V
3859alf
4
For more information www.linear.com/3859AL
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