RP601x Series 1000 mA Buck-Boost DC/DC Converter with Synchronous Rectifier NO. EA-333-200316 OUTLINE The RP601x is a CMOS-based 1000 mA buck-boost DC/DC converter with synchronous rectifier. Internally, the RP601x consists of an oscillator circuit, a reference voltage unit, an error amplifier circuit, a switch control circuit, a mode control circuit, a soft-start circuit, an undervoltage lockout (UVLO) circuit, an overcurrent protection circuit, a thermal shutdown circuit and switching transistors. The RP601x provides the forced PWM control or the PWM/ VFM auto switching control. The forced PWM control switches at fixed frequency rate in low output current in order to reduce noise. Likewise, the PWM/ VFM auto switching control automatically switches from PWM mode to VFM mode in low output current in order to achieve high efficiency. RICOHs unique control method can suppress a ripple voltage in the VFM mode, thus the RP601x can achieve both low ripple voltage at light load and high efficiency. The RP601x can be switched into forced bypass mode in PWM/ VFM auto switching control by pulling the BP pin high. The RP601x features forced bypass mode with a typical 5 A current consumption that can maximize the battery life. The RP601x is offered in a 16-bump WLCSP package measuring 1.95 mm x 1.95 mm which can achieve the smallest possible footprint solution on board where area is limited. 1 RP601x NO. EA-333-200316 FEATURES Input Voltage Range (Maximum Rating) ............... 2.3 V to 5.5 V (6.5 V) Output Voltage Range ........................................... 2.75 V to 4.2 V Output Step Voltage .............................................. Typ. 50 mV (1) Output Voltage Setting .......................................... Single-wire (S-Wire) interface Output Voltage Accuracy ....................................... PWM mode = 2%, VFM mode = PWM mode + 2% Output Voltage Temperature Coefficient ............... Typ. 50 ppm/C Line Regulation ..................................................... Typ. 0.5% (PWM mode) Load Regulation .................................................... Typ. 0.5% at I = 10 mA to 800 mA (PWM mode) OUT Maximum Output Current .................................... Typ. 1.0 A Output Pulsed Current .......................................... Max. 2.0 A (t = 10 ms, On Duty = 0.1 (ton = 1 ms), V = 3.6 V, V = 3.3 V) IN SET BULX Current Limit ............................................... Typ. 4.0 A Oscillator Frequency ............................................. Typ. 2.4 MHz Built-in Driver ON Resistance ............................... Typ. Pch. 80 m, Nch. 80 m (V = 3.6 V) IN Device Quiescent Current ..................................... Typ. 45 A (VFM mode) Standby Current .................................................... Max. 5 A Quiescent Current in Forced Bypass Mode .......... Typ. 5 A UVLO Detector Threshold ..................................... Typ. 2.1 V Soft-start Function Power Good Function Thermal Shutdown Package ................................................................ WLCSP-16-P1, 1.95 mm x 1.95 mm APPLICATIONS Power source for portable equipment such as laptops, PDAs, DSCs, cellular phones and smartphones Power source for Li-ion battery-used equipment (1) The default set output voltage (Default V ) is set by Fix Trimming (selectable from 2.75 V to 4.20 V in 0.05 V step) SET 2