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| 型号： | MAX1730EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SWITCHED CAP 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V，1.9V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 2kHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 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） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-µMAX |
50mA Regulated Step-Down Charge Pump
for 1.8V or 1.9V Logic
Functional Diagram
OUT
FB
FB CONTROL
C1P
VREF
+
DRIVERS
C1N
OSCILLATOR
MAX1730
CONTROL LOGIC
SWITCH ARRAY
C2P
C2N
SHDN
SHUTDOWN
PGND
GND
Detailed Description
The MAX1730 step-down charge pump automatically
switches between charge pump configurations (Figures
1, 2, and 3) and utilizes pulse-skipping pulse-frequency
modulation (PFM) to provide a regulated output voltage
with high efficiency. The output voltage is pin-selectable
to 1.8V or 1.9V. The MAX1730 accepts inputs between
2.7V and 5.5V and guarantees up to 50mA output cur-
rent.
Charge-Pump Configurations
Charge pumps work by passing energy through capaci-
tors. They generally work in two phases. In the first phase,
the input source charges the flying capacitors. The input
capacitor helps reduce the source’s input impedance. In
the second phase, the switching capacitors transfer their
charge to the output as needed.
Figure 1 shows the 1:1 charge-pump configuration. C1
and C2 charge in parallel between IN and GND during
the first phase. In the second phase, C1 and C2 connect
in parallel between OUT and GND.
IN
Figure 2 shows the 3:2 charge-pump configuration. C1
and C2 charge in parallel between IN and OUT during
the first phase. In the second phase, C1 and C2 connect
in series between OUT and GND.
Figure 3 shows the 2:1 charge-pump configuration. C1
and C2 charge in parallel between IN and OUT during
the first phase. In the second phase, C1 and C2 connect
in parallel between OUT and GND.
Pulse-Skipping PFM and Mode
Transitions
In the MAX1730, pulse-skipping PFM mode pauses the
oscillator when the output is in regulation. Using the 2:1
charge-pump configuration as an example, when the
output is set to half the input, the switching frequency is
near the oscillator frequency. However, for outputs below
half the input, switching pauses once the desired output
level is achieved. With no output current, the device
switches occasionally. With higher levels of current, the
switching frequency increases to supply the load.
6
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| MAX1733EUK-T | 功能描述:直流/直流开关转换器 Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1733EUK-TG05 | 功能描述:直流/直流开关转换器 Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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