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参数资料
| 型号： | LTC3548IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 400mA，800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LTC3548
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 3.6V, unless otherwise speci?ed. (Note 2)
SYMBOL
ΔV LOADREG
I S
PARAMETER
Output Voltage Load Regulation
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
CONDITIONS
(Note 3)
(Note 4)
V FB1 = V FB2 = 0.5V
V FB1 = V FB2 = 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V IN = 5.5V, MODE/SYNC = 0V
MIN
TYP
0.5
700
40
0.1
MAX
950
60
1
UNITS
%
μA
μA
μA
f OSC
Oscillator Frequency
V FB = 0.6V
l
1.8
2.25
2.7
MHz
f SYNC
Synchronization Frequency
2.25
MHz
I LIM
R DS(ON)
I SW(LKG)
POR
Peak Switch Current Limit Channel 1
Peak Switch Current Limit Channel 2
Top Switch On-Resistance
Bottom Switch On-Resistance
Switch Leakage Current
Power-On Reset Threshold
V IN = 3V, V FB = 0.5V, Duty Cycle <35%
V IN = 3V, V FB = 0.5V, Duty Cycle <35%
(Note 6)
(Note 6)
V IN = 5V, V RUN = 0V, V FB = 0V
V FB Ramping Down, MODE/SYNC = 0V
0.95
0.6
1.2
0.7
0.35
0.30
0.01
–8.5
1.6
0.9
0.45
0.45
1
A
A
Ω
Ω
μA
%
Power-On Reset On-Resistance
Power-On Reset Delay
100
262,144
200
Ω
Cycles
V RUN
I RUN
MODE
RUN Threshold
RUN Leakage Current
Mode Threshold Low
l
l
0.3
0
1
0.01
1.5
1
0.5
V
μA
V
Mode Threshold High
V IN – 0.5
V IN
V
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 LTC3548 is guaranteed to meet speci?ed performance from
0°C to 85°C. Speci?cations over the – 40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls. The LTC3548I is guaranteed to meet speci?ed
performance over the full –40°C to 85°C temperature range.
Note 3: The LTC3548 is tested in a proprietary test mode that connects V FB
to the output of the error ampli?er.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T J is calculated from the ambient T A and power dissipation P D
according to the following formula: T J = T A + (P D ? θ JA ).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C unless otherwise speci?ed.
SW
5V/DIV
V OUT
20mV/DIV
I L
200mA/DIV
Burst Mode Operation
SW
5V/DIV
V OUT
10mV/DIV
I L
200mA/DIV
Pulse-Skipping Mode
V OUT
200mV/DIV
I L
500mA/DIV
I LOAD
500mA/DIV
Load Step
V IN = 3.6V
2μs/DIV
3548 G01
V IN = 3.6V
1μs/DIV
3548 G02
V IN = 3.6V
20μs/DIV
3548 G03
V OUT = 1.8V
I LOAD = 180mA
CHANNEL 1; CIRCUIT OF FIGURE 3
V OUT = 1.8V
I LOAD = 30mA
CHANNEL 1; CIRCUIT OF FIGURE 3
V OUT = 1.8V
I LOAD = 80mA TO 800mA
CHANNEL 1; CIRCUIT OF FIGURE 3
3548fc
3
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相关代理商/技术参数 |
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