2.1MHz, 3 CHs, Step-Down Converter with I2C Interface


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The RT5800 is a multi-phase, programmable power management IC, integrated with four high efficient, synchronous step-down converter cores. The RT5800 can be 2 + 2 and 2 + 1 + 1 output by OTP. It also features wide output voltage range and the capability to configure the corresponding power stages, which make the device optimized to meet power management requirements for low-power processors, such as core power for CPUs and GPUs. The RT5800 supports many programmable functions including voltage level, slew rate of voltage change, and slew rate of soft-start via an I2C interface capable of operating up to 3.4MHz. The RT5800 also supports remote-sense function to get accurate output voltage at large loading. Moreover, the device has interrupt and fault-detection function to report error status. The RT5800 is available in a WQFN-30L 4.5x5 (FC) package.


  • Automotive Systems
Key Spec.
Status Active
Vin (min) (V) 3
Vin (max) (V) 6
Number of Outputs 3
Vout (min) (V) 0.3
Vout (max) (V) 1.85
Output Adj. Method Digital
Iout (max) (A) 5.5
Current Limit (typ) (A) 7
Freq (typ) (kHz) 2100
Freq (min) (kHz) 1850
Freq (max) (kHz) 2500
Ext Sync No
Ron_HS (typ) (mOhm) 25
Ron_LS (typ) (mOhm) 15
Iq (typ) (mA) 0.07
Interface I2C
Features ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OTP;OVP;SCP;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type WQFN4.5x5-30(FC)
  • FMEA Compliant PinOut
  • 2 + 2 / 2 + 1 + 1 Phase Output
  • Input Supply Voltage Range : 3V to 6V
  • I2C Programmable Output Voltage : 0.3V to 1.85V
  • Maximum Output Current : 5.5A per Phase
  • Output Remote Sense for High Accuracy
  • Fast Transient Response
  • Selectable Automatic Phase Shielding and Power Saving Mode Enables Higher Light Load Efficiency
  • Dynamic Voltage Scaling (DVS) with Programmable Slew Rate for Each Output
  • Programmable Soft-Start Function
  • Interrupt Function and Fault Detection
  • Watchdog Function
  • Input Under-Voltage Lockout (UVLO)
  • Cycle-by-Cycle Current Limit
  • Output Under-Voltage Protection
  • Over-Temperature Protection
  • WQFN-30L 4.5x5 (FC)