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LTC3891 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3891
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3891 Datasheet(HTML) 4 Page - Linear Technology

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LTC3890-2
4
38902f
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.
(Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Gate Driver
TG1,2 Pull-Up On-Resistance
TG1,2 Pull-Down On-Resistance
2.5
1.5
Ω
Ω
BG1,2 Pull-Up On-Resistance
BG1,2 Pull-Down On-Resistance
2.4
1.1
Ω
Ω
TG1,2 tr
TG1,2 tf
TG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
16
ns
ns
BG1,2 tr
BG1,2 tf
BG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
28
13
ns
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
BG/TG t1D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
tON(MIN)
Minimum On-Time
(Note 7)
95
ns
INTVCC Linear Regulator
VINTVCCVIN
Internal VCC Voltage
6V < VIN < 60V, VEXTVCC = 0V
4.85
5.1
5.35
V
VLDOVIN
INTVCC Load Regulation
ICC = 0mA to 50mA, VEXTVCC = 0V
0.7
1.1
%
VINTVCCEXT
Internal VCC Voltage
6V < VEXTVCC < 13V
4.85
5.1
5.35
V
VLDOEXT
INTVCC Load Regulation
ICC = 0mA to 50mA, VEXTVCC = 8.5V
0.6
1.1
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
4.5
4.7
4.9
V
VLDOHYS
EXTVCC Hysteresis
250
mV
Oscillator and Phase-Locked Loop
f25kΩ
Programmable Frequency
RFREQ = 25k, PLLIN/MODE = DC Voltage
105
kHz
f65kΩ
Programmable Frequency
RFREQ = 65k, PLLIN/MODE = DC Voltage
375
440
505
kHz
f105kΩ
Programmable Frequency
RFREQ = 105k, PLLIN/MODE = DC Voltage
835
kHz
fLOW
Low Fixed Frequency
VFREQ = 0V, PLLIN/MODE = DC Voltage
320
350
380
kHz
fHIGH
High Fixed Frequency
VFREQ = INTVCC, PLLIN/MODE = DC Voltage
485
535
585
kHz
fSYNC
Synchronizable Frequency
PLLIN/MODE = External Clock
l
75
850
kHz


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