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LTC3859_15 Datasheet, PDF (5/42 Pages) Linear Technology – Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller
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LTC3859
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full 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
PARAMETER
INTVCC Linear Regulator
VINTVCCVBIAS Internal VCC Voltage
VLDOVBIAS
INTVCC Load Regulation
VINTVCCEXT
Internal VCC Voltage
VLDOEXT
INTVCC Load Regulation
VEXTVCC
EXTVCC Switchover Voltage
VLDOHYS
EXTVCC Hysteresis
Oscillator and Phase-Locked Loop
CONDITIONS
6V < VBIAS < 38V, VEXTVCC = 0V, IINTVCC = 0mA
ICC = 0mA to 50mA, VEXTVCC = 0V
6V < VEXTVCC < 13V, IINTVCC = 0mA
ICC = 0mA to 50mA, VEXTVCC = 8.5V
EXTVCC Ramping Positive
MIN TYP MAX UNITS
5.0 5.4 5.6
V
0.7 2
%
5.0 5.4 5.6
V
0.7 2
%
4.5 4.7
V
200
mV
f25k
Programmable Frequency
f65k
Programmable Frequency
f105k
Programmable Frequency
fLOW
Low Fixed Frequency
fHIGH
High Fixed Frequency
fSYNC
Synchronizable Frequency
PGOOD1 Output
RFREQ = 25k; PLLIN/MODE = DC Voltage
RFREQ = 65k; PLLIN/MODE = DC Voltage
RFREQ = 105k; PLLIN/MODE = DC Voltage
VFREQ = 0V PLLIN/MODE = DC Voltage
VFREQ = INTVCC; PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock
115
kHz
375 440 505
kHz
835
kHz
320 350 380
kHz
485 535 585
kHz
l 75
850
kHz
VPGL1
IPGOOD1
VPG1
PGOOD1 Voltage Low
PGOOD1 Leakage Current
PGOOD1 Trip Level
TPG1
Delay For Reporting a Fault
OV3 Boost Overvoltage Indicator Output
IPGOOD1 = 2mA
VPGOOD1 = 5V
VFB1 with Respect to Set Regulated Voltage
VFB1 Ramping Negative
Hysteresis
VFB1 Ramping Positive
Hysteresis
0.2 0.4
V
±1
μA
–13 –10 –7
%
2.5
%
7
10 13
%
2.5
%
20
μs
VOV3L
IOV3
VOV
OV3 Voltage Low
OV3 Leakage Current
OV3 Trip Level
BOOST3 Charge Pump
IOV3 = 2mA
VOV3 = 5V
VFB With Respect to Set Regulated Voltage
Hysteresis
0.2 0.4
V
±1
μA
6
10 13
%
1.5
%
IBST3
BOOST3 Charge Pump Available Output VBOOST3 = 16V; VSW3 = 12V;
Current
Forced Continuous Mode
65
μA
3859fa
5
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