The ADP1870/ADP1871 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo-fixed frequency with a programmable currentlimit, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by utilizing valley current-mode control architecture. This allows the ADP1870/ ADP1871 to drive all N-channel power stages to regulate output voltages as low as 0.6 V.
The ADP1871 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1871) section for more information).
Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1870/ADP1871 are well suited for a wide range of applications that require a single-input power supply range from 2.95 V to 20 V. Low voltage biasing is supplied via a 5 V internal LDO.
In addition, an internally fixed soft start period is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft start for a precharged output. The low-side current-sense, current-gain scheme and integration of a boost diode, along with the PSM/forced pulsewidth modulation (PWM) option, reduce the external part count and improve efficiency.
The ADP1870/ADP1871 operate over the -40°C to +125°C junction temperature range and are available in 10-lead MSOP package.
产品特点和性能优势 | 电源管理设计工具 |
| 文档 | 备注 |
| ADP1870/ADP1871：具有恒定导通时间和谷值电流模式的同步降压控制器 数据手册 (Rev. B) | PDF 0 |
| ADP1870/ADP1871: Synchronous Buck Controller with Constant On-Time and Valley Current Mode Data Sheet (Rev. B) | PDF 1861 kB |
| 产品型号 | 封装 | 包装数量 | 温度范围 | 美金报价 100-499 | 美金报价 1000+ | RoHS |
|---|---|---|---|---|---|---|
| ADP1871ACPZ-0.3-R7 量产 | 10 ld LFCSP (3x3mm) | REEL 1500 | -40 至 125至 | 0 | 1.08 | Y |
| ADP1871ACPZ-0.6-R7 量产 | 10 ld LFCSP (3x3mm) | REEL 1500 | -40 至 125至 | 0 | 1.08 | Y |
| ADP1871ACPZ-1.0-R7 量产 | 10 ld LFCSP (3x3mm) | REEL 1500 | -40 至 125至 | 0 | 1.08 | Y |
| ADP1871ARMZ-0.3-R7 量产 | 10 ld MSOP | REEL 1000 | -40 至 125至 | 0 | 1.08 | Y |
| ADP1871ARMZ-0.6-R7 量产 | 10 ld MSOP | REEL 1000 | -40 至 125至 | 0 | 1.08 | Y |
| ADP1871ARMZ-1.0-R7 量产 | 10 ld MSOP | REEL 1000 | -40 至 125至 | 0 | 1.08 | Y |
| 产品型号 | 描述 | 美金报价 | RoHS |
|---|---|---|---|
| ADP1871-0.3-EVALZ | Evaluation Board | 60 | Y |
| ADP1871-0.6-EVALZ | Evaluation Board | 60 | Y |
| ADP1871-1.0-EVALZ | Evaluation Board | 60 | Y |
