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LTC3856IUH-TRPBF Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3856IUH-TRPBF
Description  2-Phase Synchronous Step-Down DC/DC Controller with Diffamp
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3856IUH-TRPBF Datasheet(HTML) 4 Page - Linear Technology

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LTC3856

3856f
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TG1,2 tr
TG1,2 tf
TG Transition Time
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
25
ns
ns
BG1,2 tr
BG1,2 tf
BG Transition Time
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
25
25
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 t2D
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)
90
ns
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
6V < VIN ≤ 38V
4.8
5.0
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 20mA
0.5
2.0
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
l
4.5
4.7
V
VLDO EXT
EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V
50
100
mV
VLDOHYS
EXTVCC Hysteresis
200
mV
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
VFREQ = 1.2V
450
500
550
kHz
fLOW
Lowest Frequency
VFREQ = 0V
210
250
290
kHz
fHIGH
Highest Frequency
VFREQ ≥ 2.4V
700
770
850
kHz
RMODE
MODE Input Resistance
250
IFREQ
Frequency Setting Output Current
9
10
11
µA
CLKOUT
Phase (Relative to Controller 1)
PHASMD = GND; Non Stage Shedding Mode
PHASMD = FLOAT; Non Stage Shedding Mode
PHASMD = INTVCC; Non Stage Shedding Mode
Stage Shedding Mode
60
90
120
180
Deg
Deg
Deg
Deg
CLKHIGH
Clock High Output Voltage
4
5
V
CLKLOW
Clock Low Output Voltage
0
0.2
V
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.2
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±2
µA
VPG
PGOOD Trip Level, Either Controller
VFB with Respect to Set Output Voltage
VFB Ramping Negative
VFB Ramping Positive
–10
10
%
%


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