RT6320B数据手册Richtek中文资料规格书

描述 Description

The RT6320 family are high efficiency synchronous step-down DC-DC converters with pseudo constant switching frequency of 500kHz and deliver up to 12A output current. The RT6320B/C and RT6320BH/CH operate from 4.5V to 23V input voltage. The output voltage of RT6320B/BH is fixed to 3.3V. The input voltage of RT6320C/CH ranges from 5.2V to 23V and the output voltage of RT6320C/CH is fixed to 5.1V.The RT6320 adopts Advanced Constant On-Time (ACOT®) control architecture that provides ultra-fast transient response and further reduces the external component count. In steady states, the ACOT® operates at nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier.By setting the voltage of the EN/MODE pin, RT6320 operates either in diode emulation mode (DEM) or ultrasonic mode (USM) at light load. The USM maintains operation frequency above 25kHz, which eliminates the acoustic noise. In the DEM, RT6320 provides the best light-load efficiency and improves the acoustic noise with spread spectrum function.RT6320 provides PGOOD indicator for easy system sequence control. Full protection features are also integrated in the device, including the cycle-by-cycle current limit, OVP, UVP, input UVLO and OTP.All the above functions are integrated in a UQFN-26L 4x3 (FC) package.

特性 Features

Input Voltage Range ► RT6320B/BH: 4.5V to 23V ► RT6320C/CH: 5.2V to 23V
Output Voltage ► RT6320B/BH: 3.3V ► RT6320C/CH: 5.1V
12A Continuous Output Current
Stable with POSCAP and MLCC Capacitor
Fast Transient Response
Diode Emulation Mode (DEM) for Power Saving
Ultrasonic Mode (USM) for Avoiding Acoustic Noise
Pseudo Constant Switching Frequency of 500kHz in CCM
Internal Power MOSFET Switch 17mΩ (high-side) and 7.5mΩ (low-side)
LDO ► RT6320B/BH: 3.3V/100mA ► RT6320C/CH: 5V/100mA
Overcurrent Limit ► RT6320B/BH/C/CH: 18A
Output Under-/Overvoltage Protection (UVP/OVP) ► RT6320B/C: Latched Mode UVP/OVP ► RT6320BH/CH: Hiccup Mode UVP and Non-Latched Mode OVP
Input Undervoltage-Lockout (UVLO)
Over-Temperature Protection (OTP) ► RT6320B/C: Latched Mode OTP ► RT6320BH/CH: Non-Latched Mode OTP
Junction Temperature Range: -40°C to 125°C

应用 Application

• Laptop Computers
• Tablet PCs
• Networking Systems
• Servers
• Personal Video Recorders
• Flat Panel Television and Monitors
• Distributed Power Systems