The RT6160A is a high-efficiency, single inductor and Advanced Constant On-Time (ACOT®) monolithic synchronous Buck-Boost converter that can deliver up to 3A of output current from 2.2V to 5.5V. It can well regulate the digitally programmable output voltage from 2.025V to 5.2V, making it suitable for a wide range of input supply applications, regardless of whether the input voltage is lower, higher than, or even equal to the output voltage. The ACOT® control architecture features outstanding line/load transient response, seamless transition between buck and boost modes, and provides stable operation with small ceramic output capacitors without the need for complicated external compensation.
The RT6160A features an I2C interface, which allows for programmable output voltage, ultra-sonic mode control, soft-start slew-rate adjustment and device status monitoring. The target output voltage can also be switched through the external VSEL pin to perform dynamic voltage scaling (DVS), and the ramp-up slew-rate and ramp mode of DVS can also be set by configuring the related registers.
The RT6160A operates with automatic PFM and has a low quiescent current design of typically 2μA, maintaining high efficiency during light load operation.
At higher loads, the device automatically switches to a 2.2MHz fixed frequency control, which easily smooths out the switching ripple voltage with small package filtering elements. And the integrated low RDS(ON) power MOSFETs features excellent efficiency under heavy load conditions. In shutdown mode, the supply current is typically 0.1μA, excellent in reducing power consumption. PFM mode can be disabled if fixed frequency is desired. The RT6160A is available in a small WL-CSP-15B 1.4x2.3 (BSC) package.
The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.


  • Smartphones and Tablets
  • Portable Devices
  • Wearable Devices
  • System Pre-Regulators
  • Point-of-Load Regulators
  • Wifi Module
  • USB VCONN Supplies
  • TWS Earbud Chargers
Key Spec.
Status Active
Vin (min) (V) 2.2
Vin (max) (V) 5.5
Vout (min) (V) 2.025
Vout (max) (V) 5.2
Iout (max) (A) 3
Current Limit (typ) (A) 5
Freq (typ) (kHz) 2200
Freq (min) (kHz) 500
Freq (max) (kHz) 3000
Ron_HS (typ) (mOhm) 25
Ron_LS (typ) (mOhm) 38
Iq (typ) (mA) 0.002
Features ACOT Control;Built-in Bootstrap Switch;Current Mode Control;Cycle-by-Cycle Current Limit;DCR Current Sense;Enable Input;Fast Transient Response;I2C;Internal Compensation;OCP;OVP;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control;Voltage Mode Control
Interface I2C
Package Type WL-CSP1.4x2.3-15(BSC)
  • Automatic Seamless Mode Transition with Real Buck, Buck-Boost and Boost Operation
  • Input Voltage Range: 2.2V to 5.5V
  • Output Voltage Range: 2.025V to 5.2V with Digitally Programmable (25mV/steps)
  • Default Output Voltage Setting:
    ► VOUT = 3.3V at VSEL = L
    ► VOUT = 3.45V at VSEL = H
  • Maximum Continuous Output Current:
    ► Up to 2.5A for VIN ≥ 2.5V, VOUT = 3.3V
    ► Up to 3A for VIN ≥ 3V, VOUT = 3.3V
    ► Up to 2A for VIN ≥ 3V, VOUT = 5V
  • Up to 95% Efficiency (VIN = 3.8V, VOUT = 3.3V, ILOAD = 1A)
  • 1μA Non-Switching Low Quiescent Current
  • I2C Interface (Up to 1MHz)
  • Allows Dynamically-Voltage-Scaling Control
  • Automatic PFM Mode and Forced PWM Mode Selection
  • Ultra-Sonic Mode Operation
  • OCP, UVLO, OTP, OVP, UVP Protected Function for Robustness
  • 15-Ball WL-CSP Package
TitleLast UpdateDownload
Low Quiescent, High Efficiency 3A Buck-Boost Converter with I2C Interface2024/05/07
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Richtek Featured Product Tree [Aug., 2023] Selection Guide2023/08/07
Power Management for Video Doorbell App. Note2021/10/08
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6160AWSCWL-CSP1.4x2.3-15(BSC)3000 Request Buy from Distributor