参数资料
| 型号： | MAX8704EUB+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V/1.2V/ADJ 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 1.5V，1.2V，可调式 |
| 输入电压： | 1 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 5A |
| 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） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
High-Current, Low-Voltage Linear Regulator
with Power-Limited, External MOSFET
The MAX8704 load-transient response graphs (see the
Typical Operating Characteristics ) show two compo-
nents of the output response: a DC load regulation and
C IN
GROUND
the transient response. A typical transient response for
a step change in the load current from 0.5A to 3.5A is
25mV. Lowering the output impedance—increasing the
output capacitor’s value and/or decreasing the ESR—
attenuates the output undershoot and overshoot.
PC Board Layout Guidelines
5V BIAS
GROUND
MAX8704
R SENSE
GROUND
OUTPUT
The MAX8704 requires proper layout to achieve the
intended output power level and regulation characteris-
tics. Proper layout involves the use of a ground plane,
appropriate component placement, and correct routing
of traces using appropriate trace widths (Figure 5).
? Minimize high-current ground loops: connect the
ground of the MAX8704, the input capacitor, and the
output capacitor together at one point.
? Minimize parasitic inductance: keep the input
capacitor, external MOSFET, and output capacitor
Figure 5. Recommended MAX8704 Layout
Using larger output capacitance can improve efficiency
in applications where the load current changes rapidly.
The output capacitor acts as a reservoir for the rapid
transient currents, reducing the peak current supplied
by the input supply and effectively lowering the I 2 R
power loss.
Soft-Start Capacitor Selection (C SS )
A capacitor (C SS ) connected from SS/EN to GND caus-
es the MAX8704 output current to slowly rise during
startup, reducing stress on the input supply. The rise
time to full current limit (t SS ) is determined by:
t SS = C SS x 1.5V / I SS
where I SS = 5μA is the soft-start current. Typical capac-
itor values between 1nF to 100nF are sufficient. Since
the regulator ramps the current-limit threshold, the
actual output-voltage slew rate depends on the load
current and output capacitance.
Noise, PSRR, and Transient Response
The MAX8704 operates with low dropout voltage and
low quiescent current in notebook computers while
maintaining good noise, transient response, and AC
rejection. See the Typical Operating Characteristics for
a graph of PSRR vs. Frequency. Improved supply-noise
rejection and transient response can be achieved by
increasing the values of the input and output capaci-
tors. Use passive filtering techniques when operating
from noisy sources.
close together. Route the ground plane directly
under the input and output power traces/planes.
? To optimize performance and power dissipation, a
ground plane is essential. Dedicated ground plane
layers reduce trace inductance, ground imped-
ance, and noise coupling (ground shield) between
layers, and improve thermal conductivity throughout
the board.
? Connect the input filter capacitor less than 10mm
from the MOSFET. The connecting copper trace car-
ries large currents and must be at least 5mm wide.
Use as much copper as necessary to decrease the
thermal resistance of the MOSFET. In general, more
copper provides better heatsinking capabilities.
Chip Information
TRANSISTOR COUNT: 786
PROCESS: BiCMOS
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8704EUB+ | 功能描述:线性稳压器 - 标准 High current Low Voltage LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX8704EUB+T | 功能描述:线性稳压器 - 标准 High current Low Voltage LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX8704EUB-T | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8704EVKIT | 功能描述:低压差稳压器 - LDO Evaluation Kit for the MAX8704 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8705ETL | 制造商:Maxim Integrated Products 功能描述:IMVP-5 CPU CORE SUPPLY - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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