参数资料
型号: LTC3854EDDB#TRMPBF
厂商: Linear Technology
文件页数: 4/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 12-DFN
标准包装: 500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 440kHz
占空比: 98%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 12-WFDFN 裸露焊盘
包装: 带卷 (TR)
LTC3854
ELECTRICAL 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: T J is calculated from the ambient temperature T A and power
dissipation PD according to the following formulas:
LTC3854DDB: T J = T A + (P D ? 76°C/W)
LTC3854MSE: T J = T A + (P D ? 40°C/W)
Note 4: The LTC3854 is tested in a feedback loop that servos V ITH to a
specified voltage and measures the resultant V FB .
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 I MAX (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 INTV CC pin.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current
Efficiency vs Input Voltage
100
98
96
94
V IN = 6V
V IN = 12V
V IN = 24V
V IN = 32V
V OUT = 5V
99
98
97
96
I OUT = 5A
V OUT = 5V
92
90
88
95
94
I OUT = 10A
86
1
2
3
4
5
6
(SEE FIGURE 9)
7 8 9 10
93
5
(SEE FIGURE 9)
10 15
20
25
30
35
40
5V OUT
200mV/DIV
LOAD CURRENT (A)
5A Load Step V OUT = 5V, V IN = 24V
3854 G01
Top Gate and Bottom Gate in
Forced Continuous Mode
BG
V IN (V)
3854 G02
Top Gate and Bottom Gate in
Dropout
BG
I LOAD
10A/DIV
5A/DIV
LOAD STEP
TG
TG
50μs/DIV
3854 G03
4μs/DIV
3854 G04
4μs/DIV
3854 G05
3854fb
4
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