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LTC3851-1 数据表(PDF) 4 Page - Linear Technology

部件名 LTC3851-1
功能描述  Synchronous Step-Down Switching Regulator Controller
Download  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3851-1 数据表(HTML) 4 Page - Linear Technology

  LTC3851-1_15 Datasheet HTML 1Page - Linear Technology LTC3851-1_15 Datasheet HTML 2Page - Linear Technology LTC3851-1_15 Datasheet HTML 3Page - Linear Technology LTC3851-1_15 Datasheet HTML 4Page - Linear Technology LTC3851-1_15 Datasheet HTML 5Page - Linear Technology LTC3851-1_15 Datasheet HTML 6Page - Linear Technology LTC3851-1_15 Datasheet HTML 7Page - Linear Technology LTC3851-1_15 Datasheet HTML 8Page - Linear Technology LTC3851-1_15 Datasheet HTML 9Page - Linear Technology Next Button
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LTC3851-1
4
38511fa
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fHIGH
Highest Frequency
RFREQ = 36k
710
750
790
kHz
RMODE/PLLIN
MODE/PLLIN Input Resistance
100
fMODE
MODE/PLLIN Minimum Input Frequency
MODE/PLLIN Maximum Input Frequency
VMODE = External Clock
VMODE = External Clock
250
750
kHz
kHz
IFREQ
Phase Detector Output Current
Sinking Capability
Sourcing Capability
fMODE > fOSC
fMODE < fOSC
–10
10
μA
μA
PGOOD Output
VPGL
PGOOD Voltage Low
IPGOOD = 2mA
0.1
0.3
V
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
±1
μA
VPG
PGOOD Trip Level
VFB with Respect to Set Regulated Voltage
VFB Ramping Negative
VFB Ramping Positive
–12
8
–10
10
–8
12
%
%
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 LTC3851E-1 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3851I-1 is guaranteed
over the –40°C to 125°C operating junction temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3851MSE-1: TJ = TA + (PD • 90°C/W)
LTC3851UD-1: TJ = TA + (PD • 68°C/W)
Note 4: The LTC3851-1 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VFB.
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).
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current and
Mode
Efficiency vs Output Current
and Mode
Efficiency vs Output Current and
Mode
LOAD CURRENT (mA)
10
40
50
60
70
80
100
1000
10000
100000
38511 G01
30
20
10
0
90
100
VIN = 12V
VOUT = 1.5V
BURST
CCM
PULSE
SKIP
LOAD CURRENT (mA)
10
40
50
60
70
80
100
1000
10000
100000
38511 G02
30
20
10
0
90
100
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
BURST
CCM
PULSE
SKIP
LOAD CURRENT (mA)
10
40
50
60
70
80
100
1000
10000
100000
38511 G03
30
20
10
0
90
100
VIN = 12V
VOUT = 5V
BURST
CCM
PULSE
SKIP


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