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ADP2119/ADP2120是ADI公司的2A/1.25A低靜態電流同步降壓DC/DC電源穩壓器,采用3 mm × 3 mm LFCSP_WD封裝.兩種器件采用恒流模式恒頻PWM控制方案,具有極好的穩定性和瞬態響應.輕負載下可工作在脈沖頻率調制(PFM)模式,以降低開關頻率,節省功耗.輸入電壓從2.3V到5.5V,輸出電壓從0.6V到VIN,輸出精度±1.5%,主要用在POL負載,通信和網絡設備,工業和儀表,消費類電子和醫療設備.本文介紹了ADP2119/ADP2120主要特性, 功能方框圖以及多種典型應用電路和所用元件.
The ADP2119/ADP2120 are low quiescent current, synchronous, step-down dc-to-dc regulators in a compact 3 mm × 3 mm LFCSP_WD package. Both devices use a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light load conditions, they can be configured to operate in a pulse frequency modulation (PFM) mode, which reduces switching frequency to save power.
The ADP2119/ADP2120 support input voltages from 2.3 V to 5.5 V. The output voltage can be adjusted from 0.6 V up to the input voltage (VIN) for the adjustable version, whereas the fixed output version is available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. The ADP2119/ADP2120 require minimal external parts and provide a high efficiency solution with their integrated power switches, synchronous rectifiers, and internal compensation. Each IC draws less than 2 μA current from the input source when it is disabled. Other key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).
ADP2119/ADP2120主要特性:
Continuous output current
ADP2119: 2 A
ADP2120: 1.25 A
145 mΩ and 70 mΩ integrated MOSFETs
Input voltage range from 2.3 V to 5.5 V
Output voltage from 0.6 V to VIN
±1.5% output accuracy
1.2 MHz fixed switching frequency
Synchronizable between 1 MHz and 2 MHz
Selectable PWM or PFM mode operation
Current mode architecture
Precision threshold enable input
Power-good flag
Voltage tracking
Integrated soft start
Internal compensation
Startup with precharged output
UVLO, OVP, OCP, and thermal shutdown
10-lead, 3 mm × 3 mm LFCSP_WD package
ADP2119/ADP2120應用:
Point of load conversion
Communications and networking equipment
Industrial and instrumentation
Consumer electronics
Medical applications
圖1.ADP2119/ADP2120功能方框圖
圖2.ADP2119典型應用電路
圖3.ADP2119典型應用電路:1.2V/2A降壓穩壓器, 強迫連續導通模式
圖4.ADP2119典型應用電路:1.8V/2A降壓穩壓器,使能PFM模式
圖5.ADP2119典型應用電路:2.5V/2A降壓穩壓器,外接時鐘同步
圖6.ADP21209典型應用電路:1.5V/1.25A降壓穩壓器,跟蹤模式
圖7.ADP21209典型應用電路:1.2V/1.25A降壓穩壓器,強迫連續導通模式
The ADP2119/ADP2120 are low quiescent current, synchronous, step-down dc-to-dc regulators in a compact 3 mm × 3 mm LFCSP_WD package. Both devices use a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light load conditions, they can be configured to operate in a pulse frequency modulation (PFM) mode, which reduces switching frequency to save power.
The ADP2119/ADP2120 support input voltages from 2.3 V to 5.5 V. The output voltage can be adjusted from 0.6 V up to the input voltage (VIN) for the adjustable version, whereas the fixed output version is available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. The ADP2119/ADP2120 require minimal external parts and provide a high efficiency solution with their integrated power switches, synchronous rectifiers, and internal compensation. Each IC draws less than 2 μA current from the input source when it is disabled. Other key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).
ADP2119/ADP2120主要特性:
Continuous output current
ADP2119: 2 A
ADP2120: 1.25 A
145 mΩ and 70 mΩ integrated MOSFETs
Input voltage range from 2.3 V to 5.5 V
Output voltage from 0.6 V to VIN
±1.5% output accuracy
1.2 MHz fixed switching frequency
Synchronizable between 1 MHz and 2 MHz
Selectable PWM or PFM mode operation
Current mode architecture
Precision threshold enable input
Power-good flag
Voltage tracking
Integrated soft start
Internal compensation
Startup with precharged output
UVLO, OVP, OCP, and thermal shutdown
10-lead, 3 mm × 3 mm LFCSP_WD package
ADP2119/ADP2120應用:
Point of load conversion
Communications and networking equipment
Industrial and instrumentation
Consumer electronics
Medical applications
圖1.ADP2119/ADP2120功能方框圖
圖2.ADP2119典型應用電路
圖3.ADP2119典型應用電路:1.2V/2A降壓穩壓器, 強迫連續導通模式
圖4.ADP2119典型應用電路:1.8V/2A降壓穩壓器,使能PFM模式
圖5.ADP2119典型應用電路:2.5V/2A降壓穩壓器,外接時鐘同步
圖6.ADP21209典型應用電路:1.5V/1.25A降壓穩壓器,跟蹤模式
圖7.ADP21209典型應用電路:1.2V/1.25A降壓穩壓器,強迫連續導通模式
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