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参数资料
| 型号： | LTC3388IMSE-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 50MA 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.8V，3V，3.3V，5V |
| 输入电压： | 2.7 V ~ 20 V |
| 电流 - 输出： | 50mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°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： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LTC3388-1/LTC3388-3
APPLICATIONS INFORMATION
Interfacing with a Microprocessor
The PGOOD, STBY, and EN pins can be useful when power-
ing a microprocessor from the LTC3388-1/LTC3388-3.
The PGOOD signal can be used to enable a sleeping micro-
processor or other circuitry when V OUT reaches regulation,
as shown in Figure 7. While active, a microprocessor may
draw a small load when operating sensors, and then draw a
large load to transmit data. Figure 7 shows the LTC3388-1/
LTC3388-3 responding smoothly to such a load step.
The microprocessor or other circuitry may require a quiet
supply for performing some functions. The STBY pin allows
the microprocessor to place the LTC3388-1/LTC3388-3 into
standby mode where the buck converter is inactive. Any
ripple in the output voltage of the LTC3388-1/LTC3388-3
will cease and the output capacitor will support the load of
the microprocessor and other circuitry. While in standby
the output voltage will decrease as it’s loaded. The output
capacitor should be sized to minimize the decline.
The EN pin can be used to activate the LTC3388-1/LTC3388-3.
For instance, in Figure 8 the LTC3388-1 is enabled by the
PGOOD output of the LTC3588-1, a piezoelectric energy
harvesting power supply, to create a 1.2V rail. The quies-
cent current that the LTC3388-1 draws will appear at the
input of the LTC3588-1, reduced by the conversion ratio
of the LTC3588-1 buck converter. Because the LTC3388-1
is driven by a 3.3V supply no capacitors are needed for
the internal V IN2 and CAP rails.
T X
+
2.7V TO 4.2V
Li-ION
10μF
6V
V IN
V IN2
EN
D1
CAP
STBY
PGOOD
LTC3388-1
SW
V OUT
22μH
1M
1.8V
STBY
EN
MICROPROCESSOR
CORE
GND
V OUT
20mV/DIV
AC-COUPLED
LOAD
CURRENT
D0
GND
47μF
6V
25mA/DIV
0mA
338813 F07a
V IN = 5.5V
250μs/DIV
338813 F07b
L = 22μH, C OUT = 100μF
LOAD STEP BETWEEN 5mA AND 50mA
Figure 7. 1.8V Step-Down Converter Powering a Microprocessor
with a Wireless Transmitter and 45mA Load Step Response
MIDE V21BL
PZ1
PZ2
V IN
PGOOD
EN
PGOOD
10μF
25V
1μF
6V
CAP
V IN2
LTC3588-1
SW
V OUT
47μH
1M
3.3V
V IN2
V IN
CAP
LTC3388-1
SW
V OUT
22μH
1.2V
4.7μF
6V
D1
D0
GND
10μF
6V
D1
D0
GND
STBY
47μF
6V
338813 F07
Figure 8. Piezoelectric Energy Harvester and 1.2V Secondary Rail
338813f
17
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