The RTQ2159 is a high-performance, synchronous step-down DC-DC converter that can deliver up to 8A output current from a 2.85V to 6.5V input supply. The output voltage can be programmed from 0.6V to 1.5V with I2C controlled 7-Bits VID.

The device integrates low RDS(ON) power MOSFETs, accurate reference voltage and an integrated diode of bootstrap circuit to offer a very compact solution.

The RTQ2159 adopts Advanced Constant On-Time (ACOT®) control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT® operates in nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier. The RTQ2159 operations in Forced-CCM that helps meet tight voltage regulation accuracy requirements.

The device offers independent enable control input pin and power good indicator for easily sequence control. To control the inrush current during the startup, the device provides a programmable soft-start up by an external capacitor connected to the SS pin. Fully protection features are also integrated in the device including the cycle-by-cycle current limit control, UVP, input UVLO and OTP. The RTQ2159 is available in a thermally enhanced WET-WQFN-21L 4x4 (FC) package.


  • Automotive Systems
  • Infotainment and Cockpit Systems
  • Vehicle ADAS ECU
  • Connected Car Systems
  • High Density DDR Memory
  • Broadband Communications and Industrial Systems
Key Spec.
Status Active
Vin (min) (V) 2.85
Vin (max) (V) 6.5
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 1.5
Output Adj. Method Digital
Iout (max) (A) 8
Current Limit (typ) (A) 9.8
Freq (typ) (kHz) 2100
Ext Sync No
Ron_HS (typ) (mOhm) 15
Ron_LS (typ) (mOhm) 10
Iq (typ) (mA) 0.5
Interface I2C
Features ACOT Control;AEC-Q100;Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;I2C;Internal Compensation;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WET-WQFN4x4-21(FC)
  • AEC-Q100 Grade 1 Qualified
  • Dramatically Fast Transient Response
  • Selectable Switching Frequency (0.46MHz / 0.69MHz / 0.92MHz / 2.1MHz)
  • Extremely High Efficiency 15mΩ/10mΩ MOSFETs
  • Advanced COT Control Loop
  • Wide Input Voltage Range from 2.85V to 6.5V
  • Optimized for Ceramic Output Capacitors
  • Internal Start-Up into Pre-biased Outputs
  • Power Good Indicator
  • Enable Control
  • Over-Current and Over-Temperature Protections
  • Under-Voltage Protection with Hiccup Mode
  • VID Control Range Via I2C Compatible Interface : 0.6V to 1.5V step = 10mV
TitleLast UpdateDownload
8A, 6.5V, 2.1MHz, ACOT® Synchronous Step-Down Converter with I2C Interface2020/09/10