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参数资料
| 型号： | MAX1705C |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| 中文描述： | 1 - 3节电池，大电流，低噪声，升压型DC - DC转换器与线性稳压器 |
| 文件页数： | 17/20页 |
| 文件大小： | 215K |
| 代理商： | MAX1705C |
M
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
______________________________________________________________________________________
17
Implementing S oft-S tart
To implement soft-start, set CLK/SEL low on power-up;
this forces PFM operation and reduces the peak switch-
ing current to 435mA. Once the circuit is in regulation,
CLK/SEL can be set high for full-power operation.
Adding a Manual Power Reset
A momentary pushbutton switch can be used to turn
the MAX1705/MAX1706 on and off (Figure 10). ONA is
pulled low and
ONB
is pulled high to turn the part off.
When the momentary switch is pressed,
ONB
is pulled
low and the regulator turns on. The switch must be
pressed long enough for the microcontroller (μC) to exit
reset (200ms) and drive ONA high. A small capacitor is
added to help debounce the switch. The μC issues a
logic high to ONA, which holds the part on regardless
of the switch state. To turn the regulator off, press the
switch again, allowing the μC to read the switch status
and pull ONA low. When the switch is released,
ONB
is
pulled high.
___________________Chip Information
TRANSISTOR COUNT: 1649
SUBSTRATE CONNECTED TO GND
MAX1705
300
2 NiCd/NiMH
2 NiCd/NiMH
3 NiCd/NiMH or 1 Li-Ion
2.4
2.4
3.6
3.3
5.0
5.0
730
500
850
MAX1706
200
450
350
550
Table 5. Typical Available Output Current
μ
C
V
DD
I/O
MAX1705
MAX1706
ONA
ONB
OUT
I/O
0.1
μ
F
ON/OFF
270k
270k
Figure 10. Momentary Pushbutton On/Off Switch
MAX1705
MAX1706
PA
RF
LX
POUT
GND
LDO
CONTROL
INPUTS
μ
C
I/O
Figure 9. Typical Phone Application
1 NiCd/NiMH
1.2
3.3
NUMBER OF CELLS
INPUT VOLTAGE
(V)
STEP-UP OUTPUT VOLTAGE:
(PA POWER SUPPLY)
(V)
TOTAL OUTPUT CURRENT
(mA)
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1705D | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| MAX1705EEE | 18-Bit Universal Bus Transceivers With 3-State Outputs 56-SSOP -40 to 85 |
| MAX1706 | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| MAX1706EEE | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| MAX1708 | High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1705EEE | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705EEE+ | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705EEE+T | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705EEE-T | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705ESE+ | 制造商:Maxim Integrated Products 功能描述:1 TO 3-CELL HIGH-CURRENT LOW-NOIS - Rail/Tube |
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