MAX1631中文资料多输出、低噪声电源控制器，用于笔记本电脑数据手册ADI规格书

描述 Description

The MAX1630–MAX1635 are buck-topology, step-down,switch-mode, power-supply controllers that generatelogic-supply voltages in battery-powered systems. Thesehigh-performance, dual/triple-output devices include on-boardpower-up sequencing, power-good signaling withdelay, digital soft-start, secondary winding control, low-dropoutcircuitry, internal frequency-compensation networks,and automatic bootstrapping.
Up to 96% efficiency is achieved through synchronousrectification and Maxim's proprietary Idle Mode™ controlscheme. Efficiency is greater than 80% over a 1000:1load-current range, which extends battery life in system-suspendor standby mode. Excellent dynamic responsecorrects output load transients caused by the latestdynamic-clock CPUs within five 300kHz clock cycles.Strong 1A on-board gate drivers ensure fast externalN-channel MOSFET switching.These devices feature a logic-controlled and synchronizable,fixed-frequency, pulse-width-modulation (PWM)operating mode. This reduces noise and RF interferencein sensitive mobile communications and pen-entry applications.Asserting the active-low SKIP pin enables fixed-frequencymode, for lowest noise under all load conditions.The MAX1630–MAX1635 include two PWM regulators,adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3Vmodes. All these devices include secondary feedbackregulation, and the MAX1630/MAX1632/MAX1633/MAX1635 each contain 12V/120mA linear regulators. TheMAX1631/MAX1634 include a secondary feedback input(SECFB), plus a control pin (STEER) that selects whichPWM (3.3V or 5V) receives the secondary feedback signal.SECFB provides a method for adjusting the secondarywinding voltage regulation point with an externalresistor divider, and is intended to aid in creating auxiliaryvoltages other than fixed 12V.
The MAX1630/MAX1631/MAX1632 contain internal outputovervoltage and undervoltage protection features.

特性 Features

• 96% Efficiency
• +4.2V to +30V Input Range
• 2.5V to 5.5V Dual Adjustable Outputs
• Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
• 12V Linear Regulator
• Adjustable Secondary Feedback (MAX1631/MAX1634)
• 5V/50mA Linear Regulator Output
• Precision 2.5V Reference Output
• Programmable Power-Up Sequencing
• Power-Good (active-low RESET) Output
• Output Overvoltage Protection (MAX1630/MAX1631/MAX1632)
• Output Undervoltage Shutdown (MAX1630/MAX1631/MAX1632)
• 200kHz/300kHz Low-Noise, Fixed-Frequency Operation
• Low-Dropout, 99% Duty-Factor Operation
• 2.5mW Typical Quiescent Power (+12V input, both SMPSs on)
• 4µA Typical Shutdown Current
• 28-Pin SSOP Package

应用 Application

• 台式CPU本地DC-DC转换器
• 笔记本电脑和亚笔记本电脑
• PDA与移动通信

简介

MAX1631属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由制造生产的MAX1631DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。