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LTC3855 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3855
Description  Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense
PDF  44 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3855 Datasheet(HTML) 4 Page - Linear Technology

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LTC3855

3855f
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
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
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 20mA
0.5
2
%
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/PLLIN MODE/PLLIN Input Resistance
250
kΩ
IFREQ
Frequency Setting Current
9
10
11
µA
CLKOUT
Phase (Relative to Controller 1)
PHASMD = GND
PHASMD = Float
PHASMD = INTVCC
60
90
120
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
0.3
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
%
%
Differential Amplifier
ADA
Gain
l
0.998
1
1.002
V/V
RIN
Input Resistance
Measured at DIFFP Input
80
kΩ
VOS
Input Offset Voltage
VDIFFP = VDIFFOUT = 1.5V, IDIFFOUT = 100µA
2
mV
PSRROA
Power Supply Rejection Ratio
5V < VIN < 38V
100
dB
ICL
Maximum Output Current
2
3
mA
VOUT(MAX)
Maximum Output Voltage
IDIFFOUT = 300µA
VINTVCC – 1.4 VINTVCC – 1.1
V
GBW
Gain Bandwidth Product
(Note 8)
3
MHz
Slew Rate
Differential Amplifier Slew Rate
(Note 8)
2
V/µs
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating
junction temperature range (E-Grade), otherwise specifications are at TA = 25°C. VIN = 15V, VRUN1,2 = 5V unless otherwise noted.



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