General Description

The RTQ8826 is a 6/5/4/3/2/1 phase synchronous buck controller. The RTQ8826 adopts G-NAVPTM (Green Native AVP), which is Richtek’s proprietary topology derived from finite DC gain of EA amplifier with current mode control, making it easy to set the droop to support all CPU/Microprocessor requirements of AVP (Adaptive Voltage Positioning). Based on the G-NAVPTM topology, the RTQ8826 features a new generation of quick response mechanism (Adaptive Quick Response, AQR) to optimize AVP performance during load transient and reduce output capacitors. The RTQ8826 supports VID on-the-fly function with four different slew rates via PMBus command setting. The DAC converts the VOUT_COMMAND code ranging from 0.25V to 1.516V with 1.953mV per step. The RTQ8826 integrates a high accuracy ADC for platform and function settings, such as SPS type, PMBus address, boot voltage and load-line. The RTQ8826 provides reset Vout function, Vout to be set to the VBOOT value while the RESET# pin is asserted low. The RTQ8826 provides VR_Ready and thermal indicators. It also features complete fault protection functions including over-voltage (OV), under-voltage (UV), slow over-current (SLOW_OC), fast over-current (Fast_OC), over-temperature (OT) and under-voltage lockout (UVLO). The RTQ8826 supports several functions which can be set by I2C/PMBus interface.

Applications

 Networking system

 Telecom, Datacom and Server system

Features

 6/5/4/3/2/1 Phase PWM Controller

 G-NAVPTM (Green Native Adaptive Voltage Positioning) Topology

 Output Voltage Ranges from 0.25V to 1.516V

 Embedded LDO for Dr.MOS 3.3V PWM Level

 Pin Programmable 27 VBOOT Voltages

 Current Sensing by Either Current Type or Voltage Type SPS

 Digital Current Balancing with Programmable Gain for Thermal Balancing

 Differential Output Voltage Sense for High Output Accuracy

 Supports Start-Up Into Pre-Bias Voltage

 Pin Selection for Enabling Load-Line Function

 Supports Returning to VBOOT from Existing Voltage or from 0V

 PMBus v1.3 Compliant Serial Interface

 Pin Selectable 16 Addresses

 1.8V and 3.3V Logic Level Compliant

 SMBALERT#

 Internal Non-Volatile Memory (NVM) to Store Custom Configurations

 Programmable Power Up/Down Timing

 Monitoring for VOUT, IOUT and Temperature

 Selectable Latch or Autonomous Recovery After Shutdown Due to Fault

 Extensive Fault Detection and Protection Capability

 VIN & VCC Input Pins UVLO

 Averaged Output SLOW/FAST_OC Protection

 Output OV & UV Protection

 Output Temperature Warning & Protection

 Indicator for VR_Ready & VR_Hot#

 Small 48-Lead WQFN Package

 Point-of-load power supply (DSP, ASIC, FPGA)