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参数资料
| 型号： | MAX848ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV LN HP 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，RF 数据链路 |
| 输入电压： | 0.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 3.3V，2.7 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
1-Cell to 3-Cell, High-Power,
Low-Noise, Step-Up DC-DC Converters
1M ?
MAX848
μ C
MAX849
ON2
ON1
OUT
V DD
I/O
I/O
MAX848
MAX849
MAX8865/MAX8866 DUALS
MAX8863/MAX8864 SINGLES
PA
1M ?
μ C
RADIO
Figure 9. Momentary Pushbutton On/Off Switch
Capacitor Selection
Input Bypass Capacitors
A 22μF, low-ESR input capacitor will reduce peak cur-
rents and reflected noise due to inductor current ripple.
Smaller ceramic capacitors may also be used for light
loads or in applications that can tolerate higher input
ripple.
Output Filter Capacitors
Two 100μF (single 100μF for the MAX848), 10V, low-
ESR, output filter capacitors typically exhibit 30mV rip-
ple when stepping up from 1.2V to 3.3V at 200mA
(100mA for the MAX848). Bypass the MAX848/MAX849
supply input, OUT, with a 0.1μF ceramic capacitor
to GND. Also bypass POUT to PGND with a 0.1μF
ceramic capacitor.
The filter capacitors’ equivalent series resistance (ESR)
affects efficiency and output ripple. The output voltage
ripple is the product of the peak inductor current and
the output capacitor’s ESR. Low-ESR, surface-mount
tantalum capacitors are currently available from
Sprague (595D series) and AVX (TPS series). Sanyo
OS-CON organic-semiconductor, through-hole capaci-
tors also exhibit very low ESR, and are especially useful
for operation at cold temperatures. See Table 5 for a list
of suggested capacitor suppliers.
Table 3. Available Output Power
Figure 10. Typical Phone Application
Applications Information
Using a Momentary On/Off Switch
A momentary pushbutton switch can be used to turn
the MAX848/MAX849 on and off.
As shown in Figure 9, ON1 is pulled low and ON2 is
pulled high when the part is off. When the momentary
switch is pressed, ON2 is pulled low and the regulator
turns on. The switch should be on long enough for the
μC to exit reset. The controller issues a logic high to
ON1, which guarantees that the part will stay on,
regardless of the switch state.
To turn off the regulator, the switch is pressed and held.
The controller reads the switch status and pulls ON1
low. The switch is released and ON2 is pulled high.
Power Amplifier (PA) and Radio Supply
in a Typical Phone Application
The MAX849 is an ideal power supply for the power
amplifier (PA) and the radio used in digital cordless
and PCS phones (Figure 10). The PA is directly pow-
ered by the MAX849 for maximum output swing. Post-
linear regulators power the controller and the radio. In
addition, they reduce switching noise and ripple. Table
3 lists the output power available when operating with
one or more NiCd/NiMH cells or one Li-Ion cell.
NUMBER OF CELLS
1 NiCd/NiMH
2 NiCd/NiMH
2 NiCd/NiMH
3 NiCd/NiMH or 1 Li-Ion
INPUT VOLTAGE
(V)
1.2
2.4
2.4
3.6
OUTPUT VOLTAGE:
PA POWER SUPPLY
(V)
3.3
3.3
5.0
5.0
OUTPUT POWER
(W)
0.9
2.4
2.6
4.3
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX849ESE | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up DC/DC 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 |
| MAX849ESE+ | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up DC/DC 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 |
| MAX849ESE+T | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up DC/DC 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 |
| MAX849ESE-T | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up DC/DC 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 |
| MAX849EVKIT | 功能描述:直流/直流开关转换器 1-Cell to 3-Cell High-Power Low-Noise Step-Up DC-DC 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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