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LTC3875 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3875
Description  Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3875 Datasheet(HTML) 4 Page - Linear Technology

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LTC3875
4
3875fa
For more information www.linear.com/LTC3875
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). VIN = 15V, VRUN1,2 = 5V unless otherwise noted.
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 Synchronous 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
5.3
5.5
5.7
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 = 5.5V
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
220
250
270
kHz
fHIGH
Highest Frequency
VFREQ ≥ 2.4V
650
720
790
kHz
RMODE/PLLIN
MODE/PLLIN Input Resistance
250
IFREQ
Frequency Setting Current
9.5
10
10.5
µA
CLKOUT
Phase (Relative to Controller 1)
PHASMD = GND
PHASMD = FLOAT
PHASMD = INTVCC
60
90
120
Deg
Deg
Deg
CLK High
Clock Output High Voltage
VINTVCC = 5.5V
4.5
5.5
V
CLK Low
Clock Output Low Voltage
0.2
V
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5.5V
±2
µA
VPG
PGOOD Trip Level, Either Controller VOSNS+ with Respect to Set Output Voltage
VOSNS+ Ramping Negative
VOSNS+ Ramping Positive
–7.5
7.5
%
%
On-Chip Driver
TG RUP
TG Pull-Up RDS(ON)
TG High
2.6
Ω
TG RDOWN
TG Pull-Down RDS(ON)
TG Low
1.5
Ω
BG RUP
BG Pull-Up RDS(ON)
BG High
2.4
Ω
BG RDOWN
BG Pull-Down RDS(ON)
BG Low
1.1
Ω
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3875 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3875E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3875I is guaranteed over the full –40° to 125° operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3: TJ is calculated from the ambient temperature, TA, and power
dissipation, PD, according to the formula:
TJ = TA + (PD • 33°C/W)
Note 4: The LTC3875 is tested in a feedback loop that servos VITH1,2 to a
specified voltage and measures the resultant VOSNS1,2+.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: Guaranteed by design.


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