ADP2441是AD公司的一款開關穩(wěn)壓器產品,ADP2441是36 V、1 A同步降壓DC-DC調節(jié)器,本站介紹了ADP2441的封裝應用圖解、特點和優(yōu)點、功能等,并給出了與ADP2441相關的AD元器件型號供參考。
ADP2441 - 36 V、1 A同步降壓DC-DC調節(jié)器 - 開關穩(wěn)壓器 - 電源管理 - Analog Devices, LLC
ADP2441是恒定頻率、采用電流模式控制的同步降壓dc-dc調節(jié)器,可驅動最高1 A的負載,并具有出色的線路和負載調節(jié)特性。它可在寬輸入電壓范圍內(4.5 V至36 V)工作,是調整多種類型輸入源功率的理想選擇。另外,它還具有非常低的最短導通時間(50 ns),因此適合那些需要非常高降壓比的應用。
輸出電壓可在0.6 V至0.9 V × VIN之間調節(jié)。該器件同時針對高端和低端設備集成低電阻N溝道MOSFET,可實現高效率。
開關頻率可用外部電阻在300 kHz至1 MHz范圍內調節(jié)。另外,ADP2441還有一個精確的電源良好(PGOOD)開漏輸出信號。
在負載較低的情況下,調節(jié)器通過跳過脈沖并降低開關損耗工作在脈沖跳躍模式下,可提升能效。此外,在中負載至高負載情況下,調節(jié)器工作在固定頻率脈寬調制(PWM)模式以降低電磁干擾(EMI)。
ADP2441使用打嗝模式保護IC不受短路或輸出端過流情況影響。外部可編程軟啟動可限制多種負載電容啟動時的浪涌電流。其它重要特性包括跟蹤、輸入欠壓閉鎖(UVLO)、熱關斷(TSD)和精密使能(EN),亦可用于邏輯電平關斷輸入。
ADP2441采用3 mm × 3 mm、12引腳LFCSP封裝,額定工作溫度范圍為?40°C至+125℃結溫范圍。
應用
The ADP2441 evaluation board is a complete, dc-to-dc switch-ing regulator design based on the ADP2441, a configurable, 1 A, synchronous step-down, dc-to-dc regulator.
The ADP2441 is a synchronous, step-down dc-to-dc switching regulator that uses a current mode pulse-width modulation (PWM) control scheme at medium-to-heavy load currents for high efficiency and smoothly transitions to a pulse skip mode at light loads to conserve power. The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. The ADP2441 is optimized for operation with small ferrite core inductors and ceramic capacitors to deliver the maximum output power per square millimeter of the PCB board area.
The ADP2441-EVALZ is available with 5 V at 1 A output, switching frequency set to 500 kHz. If needed, the ADP2441 evaluation board configuration can be modified by changing the values of the appropriate passive components.
Complete specifications for the ADP2441 device can be found in the ADP2441 data sheet, which is available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board.
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