同步降压控制器具有恒定导通时间和谷值电流模式 Synchronous Buck Controller with Constant On-Time and Valley Current Mode
Product Details
The ADP1874/ADP1875 are versatile current mode, synchronous step-down controllers. They provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo fixed frequency with a programmable current limit, current control scheme. In addition, these devices offer optimum performance at low duty cycles by using a valley, current mode control architecture. This allows the ADP1874/ADP1875 to drive all N-channel power stages to regulate output voltages to as low as 0.6 V.
The ADP1875 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 ADP1875 Power Saving Mode PSM section for more information.
Available in three frequency options 300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option, the ADP1874/ADP1875 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 low dropout regulator LDO.
In addition, soft start programmability is included to limit input inrush current from the input supply during startup and to provide reverse current protection during precharged output conditions. 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 ADP1874/ADP1875 operate over the −40°C to +125°C junction temperature range and are available in a 16-lead QSOP package.
**APPLICATIONS**
### Features and Benefits
2.95 V to 20 V
电源电压DC 2.95V min
输出接口数 1
输出电压 600 mV
开关频率 300 kHz
占空比 84 %
输入电压Max 20 V
输入电压Min 2.95 V
最大占空比 84 %
工作温度Max 125 ℃
工作温度Min -40 ℃
电源电压 2.95V ~ 20V
电源电压Max 20 V
电源电压Min 2.95 V
输入电压 2.95V ~ 20V
安装方式 Surface Mount
引脚数 16
封装 QSOP-16
封装 QSOP-16
工作温度 -40℃ ~ 125℃ TJ
产品生命周期 Active
包装方式 Cut Tape CT
RoHS标准 RoHS Compliant
含铅标准 Lead Free
REACH SVHC标准 No SVHC
REACH SVHC版本 2015/12/17