RT6160A Buck-Boost Converter with I²C Interface Evaluation Board

Product Highlights > RT6160A Buck-Boost Converter with I²C Interface Evaluation Board

            RT6160A Buck-Boost Converter with I²C Interface Evaluation Board
                    Richtek’s 2 μA low quiescent, high efficiency, 3 A buck-boost converter is ideal for portable and wearable devices
    

Richtek’s RT6160A high-efficiency, single inductor, advanced constant on-time (ACOT®) monolithic synchronous buck-boost converter delivers up to 3 A output current from 2.2 V to 5.5 V. It is regulated to the digitally programmable output voltage from 2.025 V to 5.2 V. The RT6160A is suitable for wide input supply range applications, regardless of whether the input voltage is lower than, higher than, or even equal to the output voltage. The ACOT control architecture features outstanding line/load transient response and seamless transition between buck and boost modes, providing stable operation with small ceramic output capacitors and without complicated external compensation.

The RT6160A features an I²C interface, which allows programmable output voltage, ultrasonic mode control, soft-start slew-rate adjusted, and device status monitoring. The target output voltage can also be switched through an external V_SEL pin to perform dynamic voltage scaling (DVS), and the ramp-up slew rate and ramp mode of DVS can also be set by setting the related registers.

The RT6160A operates in automatic pulse frequency modulation (PFM) and a typical 2 μA low quiescent (I_Q) current design that maintains high efficiency during light load operation. At higher loads, the device automatically switches to a 2.2 MHz fixed frequency control, easily smoothed out when switching ripple voltage by small package filtering elements. The integrated low R_DS(ON) power MOSFETs feature excellent efficiency during heavy load conditions. In shutdown mode, the supply current is typically 0.1 μA, which is excellent in reducing power consumption. PFM mode can be disabled if fixed frequency is desired.

The EVB_RT6160A evaluation board is designed to demonstrate the capabilities of the RT6160A for 3 A output current from 2.2 V to 5.5 V and digitally programmable output voltage from 2.025 V to 5.2 V.

Features

Automatic seamless mode transition with real buck, buck-boost, and boost operation
Input voltage range: 2.2 V to 5.5 V
Output voltage range: 2.025 V to 5.2 V with digitally programmable (25 mV/steps)
Default output voltage setting:
- V_OUT = 3.3 V at V_SEL = L
- V_OUT = 3.45 V at V_SEL = H
Up to 95% efficiency (V_IN = 3.8 V, V_OUT = 3.3 V, I_LOAD = 1 A)
1 μA non-switching I_Q current
I²C interface (Up to 1 MHz)

Maximum continuous output current:
- Up to 2.5 A for V_IN ≥ 2.5 V, V_OUT = 3.3 V
- Up to 3 A for V_IN ≥ 3 V, V_OUT = 3.3 V
Up to 2 A for V_IN ≥3 V, V_OUT = 5 V
Allows DVS control
Automatic PFM mode and forced pulse width modulation (PWM) mode selection
Ultrasonic mode operation
Overcurrent protection (OCP), undervoltage lockout (UVLO), overtemperature protection (OTP), overvoltage protection (OVP), and undervoltage protection (UVP) functions for robustness