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参数资料
| 型号： | MAX848ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16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
the timing resistor should not exceed the difference
MAX848
μ C
between the output voltage and the μC reset threshold
voltage. This resistor should be large enough to mini-
mize the shutdown current.
MAX849
OUT
V CC
μC-Controlled Shutdown
The MAX848/MAX849 turn on when ON1 = 1 or ON2 = 0.
R
The μC monitors the battery voltage and turns off the
POK
RESET
device (forces ON1 low and ON2 high) when the bat-
tery is weak.
C
Layout Considerations
Due to high inductor current levels and fast switching
Figure 11. Power-On Reset Delay
Power-On Reset Delay
Adding a timing capacitor from POK to GND generates
a power-on reset delay. The reset time constant is
determined by the pull-up resistor and timing capacitor
(Figure 11). When power is turned on, POK is low and
the capacitor is shorted. When the output voltage
reaches regulation, POK goes high and the capacitor
slowly charges to the output voltage.
The timing resistor value depends on the controller’s
RESET input leakage current. The voltage drop across
Table 4. Component Selection Guide
waveforms, which radiate noise, proper PC board lay-
out is essential. Protect sensitive analog grounds by
using a star ground configuration. Minimize ground
noise by connecting PGND, the input bypass capacitor
ground lead, and the output filter capacitor ground lead
to a single point (star ground configuration). Also, mini-
mize lead lengths to reduce stray capacitance and
trace resistance.
If an external resistor divider is used to set the output
voltage (Figure 5), the trace from FB to the resistors
must be extremely short and must be shielded from
switching signals, such as CLK, DATA, or LX.
PRODUCTION
Surface Mount
Through Hole
INDUCTORS
Sumida CDR63B, CD73, CDR73B, CD74B series
Coilcraft DO1608, DO3308, DT3316 series
Sumida RCH654 series
CAPACITORS
Matsuo 267 series
Sprague 595D series
AVX TPS series
Sanyo OS-CON series
Nichicon PL series
DIODES
Motorola MBR0520L
Motorola 1N5817
Table 5. Component Suppliers
Chip Information
SUPPLIER
AVX
Coilcraft
Matsuo
Motorola
Sanyo
Sumida
PHONE
USA: 803-946-0690
800-282-4975
USA: 847-639-6400
USA: 714-969-2491
USA: 602-303-5454
USA: 619-661-6835
Japan: 81-7-2070-6306
USA: 847-956-0666
Japan: 81-3-3607-5111
FAX
803-626-3123
847-639-1469
714-960-6492
602-994-6430
619-661-1055
81-7-2070-1174
847-956-0702
81-3-3607-5144
TRANSISTOR COUNT: 2059
14
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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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