MAX1634数据手册集成电路（IC）的PMIC-稳压器-DCDC开关式控制器规格书PDF

描述 Description

The MAX1630–MAX1635 are buck-topology, step-down, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.
Up to 96% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong 1A on-board gate drivers ensure fast external N-channel MOSFET switching. These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Asserting the active-low SKIP pin enables fixed-frequency mode, 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 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630/MAX1632/MAX1633/ MAX1635 each contain 12V/120mA linear regulators. The MAX1631/MAX1634 include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.
The MAX1630/MAX1631/MAX1632 contain internal output overvoltage 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

MAX1634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MAX1634DC-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。