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LTC3899_15 Datasheet, PDF (5/38 Pages) Linear Technology – 60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller
◁
LTC3899
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) VBIAS = 12V, VRUN1,2,3 = 5V, VEXTVCC = 0V, VDRVSET =
0V, VPRG3 = Float unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
BDSW1,2,3 BOOST to DRVCC Switch On-Resistance
VSW = 0V, VDRVSET = INTVCC
3.7
Ω
TG1,2,3 tr
TG1,2,3 tf
TG Transition Time:
Rise Time
Fall Time
(Note 6) VDRVSET = INTVCC
CLOAD = 3300pF
CLOAD = 3300pF
25
ns
15
ns
BG1,2,3 tr
BG1,2,3 tf
BG Transition Time:
Rise Time
Fall Time
(Note 6) VDRVSET = INTVCC
CLOAD = 3300pF
CLOAD = 3300pF
25
ns
15
ns
TG1,2/BG1,2 Top Gate Off to Bottom Gate On Delay
CLOAD = 3300pF Each Driver, VDRVSET = INTVCC
55
ns
t1D
Synchronous Switch-On Delay Time
BG1,2/TG1,2 Bottom Gate Off to Top Gate On Delay
CLOAD = 3300pF Each Driver, VDRVSET = INTVCC
50
ns
t1D
Top Switch-On Delay Time
TG3/BG3 t1D CH3 Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver, VDRVSET = INTVCC
85
ns
Bottom Switch-On Delay Time
BG3/TG3 t1D CH3 Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver, VDRVSET = INTVCC
80
ns
Synchronous Switch-On Delay Time
tON(MIN)1,2 Buck Minimum On-Time
tON(MIN)3
Boost Minimum On-Time
DRVCC Linear Regulator
VDRVCC(INT) DRVCC Voltage from Internal VBIAS LDO
VLDOREG(INT) DRVCC Load Regulation from VBIAS LDO
VDRVCC(EXT) DRVCC Voltage from Internal EXTVCC LDO
VLDOREG(EXT)
VEXTVCC
DRVCC Load Regulation from Internal
EXTVCC LDO
EXTVCC LDO Switchover Voltage
VLDOHYS
EXTVCC Hysteresis
VDRVCC(50kΩ) Programmable DRVCC
VDRVCC(70kΩ) Programmable DRVCC
VDRVCC(90kΩ) Programmable DRVCC
Oscillator and Phase-Locked Loop
(Note 7) VDRVSET = INTVCC
(Note 7) VDRVSET = INTVCC
VEXTVCC = 0V
7V < VBIAS < 60V, DRVSET = 0V
11V < VBIAS < 60V, DRVSET = INTVCC
ICC = 0mA to 50mA, VEXTVCC = 0V
7V < VEXTVCC < 13V, DRVSET = 0V
11V < VEXTVCC < 13V, DRVSET = INTVCC
ICC = 0mA to 50mA, VEXTVCC = 8.5V,
VDRVSET = 0V
EXTVCC Ramping Positive
DRVSET = 0V or RDRVSET ≤ 100kΩ
DRVSET = INTVCC
RDRVSET = 50kΩ, VEXTVCC = 0V
RDRVSET = 70kΩ, VEXTVCC = 0V
RDRVSET = 90kΩ, VEXTVCC = 0V
80
ns
120
ns
5.8 6.0 6.2
V
9.6 10.0 10.4
V
0.9 2.0
%
5.8 6.0 6.2
V
9.6 10.0 10.4
V
0.7 2.0
%
4.5 4.7 4.9
V
7.4 7.7 8.0
V
250
mV
5.0
V
6.4 7.0 7.6
V
9.0
V
f25kΩ
Programmable Frequency
f65kΩ
Programmable Frequency
f105kΩ
Programmable Frequency
fLOW
Low Fixed Frequency
fHIGH
High Fixed Frequency
fSYNC
Synchronizable Frequency
PLLIN VIH
PLLIN VIL
PLLIN/MODE Input High Level
PLLIN/MODE Input Low Level
BOOST3 Charge Pump
RFREQ =25kΩ, PLLIN/MODE = DC Voltage
105
kHz
RFREQ = 65kΩ, PLLIN/MODE = DC Voltage
375 440 505
kHz
RFREQ = 105kΩ, PLLIN/MODE = DC Voltage
835
kHz
VFREQ = 0V, PLLIN/MODE = DC Voltage
320 350 380
kHz
VFREQ = INTVCC, PLLIN/MODE = DC Voltage
485 535 585
kHz
PLLIN/MODE = External Clock
l 75
850
kHz
PLLIN/MODE = External Clock
PLLIN/MODE = External Clock
l 2.5
l
V
0.5
V
IBST3
BOOST3 Charge Pump Available Output
FREQ = 0V, PLLIN/MODE = INTVCC
Current
VBOOST3 = 16.5V, VSW3 = 12V
VBOOST3 = 19V, VSW3 = 12V
75
µA
35
µA
3899f
For more information www.linear.com/LTC3899
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