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General Description

The RT6310 family are high efficiency synchronous step-down DC-DC converters with pseudo constant switching frequency 500kHz and deliver up to 10A output current. The RT6310A/B/D and RT6310AH/BH/DH operate from 4.5V to 23V input voltage. The output voltage of RT6310A/AH/D/DH is programmable between 0.6V to 5.5V and RT6310B/BH is fixed to 3.3V output voltage. The input voltage of RT6310C/CH ranges from 5.2V to 23V and the output voltage of RT6310C/CH is fixed to 5.1V.

The RT6310 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, RT6310 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, RT6310 provides the best light-load efficiency and improves the acoustic noise with spread spectrum function.

RT6310 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 above functions are integrated in a UQFN-23L 3x3 (FC) package.

? 10A 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 500kHz in CCM

? Internal Power MOSFET Switch 17m? (high-side) and 7.5m? (low-side)

? LDO

? RT6310B/BH : 3.3V/100mA

? RT6310C/CH : 5V/100mA

? Over-Current Limit

? RT6310A/AH : Adjustable (13A, 15A or 17A)

? RT6310D/DH : Adjustable (6.5A, 16A or 25.8A)

? RT6310B/BH/C/CH : 15A

? Output Under-/Over-Voltage Protection (UVP/OVP)

? RT6310A/B/C/D : Latched Mode UVP/OVP

? RT6310AH/BH/CH/DH : Hiccup Mode UVP and Non-Latched Mode OVP

? Input Under-Voltage-Lockout (UVLO)

? Over-Temperature Protection (OTP)

? RT6310A/B/C/D : Latched Mode OTP

? RT6310AH/BH/CH/DH : Non-Latched Mode OTP

Applications

? Laptop Computers

? Tablet PCs

? Networking Systems

? Servers

? Personal Video Recorders

? Flat Panel Television and Monitors

? Distributed Power Systems