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LTC3854EMSE 数据表(PDF) 4 Page - Linear Technology

部件名 LTC3854EMSE
功能描述  Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC 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

LTC3854EMSE 数据表(HTML) 4 Page - Linear Technology

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LTC3854

3854fa
elecTrical characTerisTics
Efficiency vs Output Current
Efficiency vs Input Voltage
5A Load Step VOUT = 5V, VIN = 24V
Top Gate and Bottom Gate in
Forced Continuous Mode
Top Gate and Bottom Gate in
Dropout
LOAD CURRENT (A)
1
100
90
92
94
96
98
88
86
5
3
7
8
9
3854 G01
10
4
2
6
VIN = 12V
VIN = 24V
VIN = 32V
VIN = 6V
(SEE FIGURE 9)
VOUT = 5V
VIN (V)
5
99
96
94
97
98
95
93
25
15
35
3854 G02
40
20
10
30
VOUT = 5V
(SEE FIGURE 9)
IOUT = 10A
IOUT = 5A
5VOUT
200mV/DIV
5A/DIV
LOAD STEP
ILOAD
10A/DIV
50µs/DIV
3854 G03
BG
TG
4µs/DIV
3854 G04
BG
TG
4µs/DIV
3854 G05
Typical perForMance characTerisTics
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 LTC3854E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3854I is guaranteed to meet
performance specifications over the full –40°C to 85°C operating
temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC3854DDB: TJ = TA + (PD • 76°C/W)
LTC3854MSE: TJ = TA + (PD • 40°C/W)
Note 4: The LTC3854 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. Not 100% tested in production.
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: The LTC3854 maximum LDO current specification assumes there
is no external DC load current being pulled from INTVCC pin.


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