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参数资料
| 型号： | MAX8805ZEWECE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC CONV STP-DN PWM 600MA 16WLP |
| 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，WCDMA PA 电源 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFBGA，WLCSP |
| 供应商设备封装： | 16-WLP（2x2） |
| 包装： | 带卷 (TR) |
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
shutdown, the outputs of the LDOs are pulled to ground
through an internal 1k ? resistor.
When the PA step-down and LDOs are all in shutdown,
the MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
enter a very low power state, where the input current
Table 1. LDO1 and LDO2 Output Voltage
Selection
FREQUENCY LDO1 LDO2
PART
(MHz) (V) (V)
drops to 0.1μA (typ).
Step-Down Converter Soft-Start
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z PA
step-down converter has internal soft-start circuitry that
limits inrush current at startup, reducing transients on the
input source. Soft-start is particularly useful for supplies
with high output impedance such as Li+ and alkaline
cells. See the PA Step-Down Soft-Start Waveforms
(MAX8805X/MAX8805Z) and PA Step-Down Soft-Start
Waveforms (MAX8805W/MAX8805Y) in the Typical
Operating Characteristics.
Analog REFIN Control
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z PA
MAX8805WE_EAA+T
MAX8805WE_EAE+T
MAX8805WE_EEE+T
MAX8805XE_EAA+T
MAX8805XE_EAE+T
MAX8805XE_EEE+T
MAX8805YE_EAA+T
MAX8805YE_EAE+T
MAX8805YE_EEE+T
MAX8805ZE_EAA+T
MAX8805ZE_EAE+T
MAX8805ZE_EEE+T
2
2
2
4
4
4
2
2
2
4
4
4
1.80
1.80
2.85
1.80
1.80
2.85
1.80
1.80
2.85
1.80
1.80
2.85
1.80
2.85
2.85
1.80
2.85
2.85
1.80
2.85
2.85
1.80
2.85
2.85
step-down converter uses REFIN to set the output volt-
age. This allows the converter to operate in applications
where dynamic voltage control is required.
Thermal Shutdown
Thermal shutdown limits total power dissipation in the
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z. If the
junction temperature exceeds +160°C, thermal-shut-
down circuitry turns off the IC, allowing it to cool. The IC
turns on and begins soft-start after the junction temper-
ature cools by 20°C. This results in a pulsed output dur-
ing continuous thermal-overload conditions.
Applications Information
Output Voltages
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z PA
step-down converters set the PA_ output voltage based
on the voltage applied to REFIN.
LDO1 and LDO2 output voltages are determined by the
part number suffix, as shown in Table 1.
LDO Dropout Voltage
The regulator’s minimum input/output differential (or
dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines
the useful end-of-life battery voltage. Because the
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z LDOs use
a p-channel MOSFET pass transistor, their dropout volt-
ages are a function of drain-to-source on-resistance
(R DS(ON) ) multiplied by the load current (see the Typical
Operating Characteristics).
Note: Contact the factory for other output-voltage options.
Inductor Selection
The MAX8805W/MAX8805Y operate with a switching
frequency of 2MHz and utilize a 2.2μH inductor. The
MAX8805X/MAX8805Z operate with a switching fre-
quency of 4MHz and utilize a 1μH inductor. The higher
switching frequency of the MAX8805X/MAX8805Z allow
the use of physically smaller inductors at the cost of
slightly lower efficiency. The lower switching frequency
of the MAX8805W/MAX8805Y results in greater efficien-
cy at the cost of a physically larger inductor. See the
Typical Operating Characteristics for efficiency graphs
for both the MAX8805W/MAX8805Y and MAX8805X/
MAX8805Z.
The inductor’s DC current rating only needs to match the
maximum load of the application because the
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z feature
zero current overshoot during startup and load tran-
sients. For optimum transient response and high efficien-
cy, choose an inductor with DC series resistance in the
50m ? to 150m ? range. See Table 2 for suggested
inductors and manufacturers.
Output Capacitor Selection
For the PA step-down converter, the output capacitor
(C PA ) is required to keep the output voltage ripple small
and ensure regulation loop stability. C PA must have low
impedance at the switching frequency. Ceramic capaci-
tors with X5R or X7R dielectric are highly recommended
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8805ZEWEDD+T | 功能描述:直流/直流开关转换器 600mA/650mA PWM 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 |
| MAX8805ZEWEEE+T | 功能描述:直流/直流开关转换器 600mA/650mA PWM 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 |
| MAX8805ZEWEGG+T | 功能描述:直流/直流开关转换器 600mA/650mA PWM 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 |
| MAX8808EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX8808 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8808XETA | 制造商:Maxim Integrated Products 功能描述:1A LINEAR LI+ BATT CHRGRS W. INTEG - Rail/Tube |
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