RP402K501A-EV High Efficiency Small Packaged Step-up DC/DC Converter Evaluation Board No. EEV-317- K501A-190212 RP402K501A-EV is the evaluation board for RP402 which has the below features, benefits and specifications. OUTLINE The RP402K is a high efficiency step-up DC/DC converter with synchronous rectifier. The device can start up with low voltage of typically 0.7 V which is ideal for the applications powered by either one-cell or two- cell alkaline, nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) batteries. Internally, the RP402K consists of an oscillator, a reference voltage unit with soft start, a chip enable circuit, an error amplifier, phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control circuit, internal switches and protection circuits. The RP402K is employing synchronous rectification for improving the efficiency or rectification by replacing diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance but also allows a design to reduce parts count. The RP402K is available in either internally fixed output voltage type or adjustable output voltage type. The RP402Kxxxx is the internally fixed output voltage type. The RP402K provides the forced PWM control and the PWM/VFM auto switching control. Either one of these can be selected by inputting a signal to the MODE pin. 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. The RP402K has a soft-start time of typically 0.5 ms. The RP402K features the complete output disconnect shutdown option and the input-to-output bypass shutdown option. The RP402KxxxA/ B/ E/ F incorporates the complete output disconnect shutdown option, which allows the output to be disconnected from the input. The RP402KxxxC/ D/ G/ H incorporates the input-to-output bypass shutdown option, which allows the output to be connected to the input. The RP402K is protected against damage by a short-current protection, an over-voltage lockout, an over voltage protection, an anti-ringing switch and a latch-type protection. An anti-ringing switch prevents the occurrence of noise when an inductor current reaches a discontinuous mode. The RP402K provides optional Latch function with current limit detection which can turn off the power in case the limit values are detected for a fixed time and current limit circuit controls peak inductor currents in every clock. The latch-type protection can be released by switching the CE pin from high to low while the power is turned on. 1 RP402 K No. EEV-317- K501A-190212 FEATURES Low Voltage Start-up Typ. 0.7 V Input Voltage Range Fixed Output Voltage Type: 0.6 V to 4.8 V High Efficiency 94% (100 mA/ 5.0 V, VIN = 3.6 V, 25C) 90% (1 mA/ 5.0 V, VIN = 3.6 V, 25C) Output Current 800 mA: VIN = 3.6 V, VOUT = 5.0 V LX Driver ON Resistance NMOS/ PMOS: 0.20 (VOUT = 5.0 V, 25C) PWM Oscillator Frequency 1.2 MHz (Normal PWM), 1.0 MHz (Forced PWM) Output Voltage Range Fixed Output Voltage Type: 1.8 V to 5.5 V, 0.1 V step OVLO Detector Threshold Typ. 5.1 V OVP Detector Threshold Typ. 6.0 V LX Peak Current Limit Typ. 1.5 A Latch Protection Delay Time Typ. 3.3 ms (RP402Kxx1x) Typ. 4.1 ms (RP402Kxx2x) Soft-start Time Typ. 0.5 ms EMI Suppression (Built-in Anti-ringing Switch) (RP402Kxx1x) Voltage Regulation at VIN > VOUT Zero Input Complete Shutdown at VIN = 0 V Input-to-Output Bypass Shutdown Option at CE = L (RP402KxxxC/ D/ G/ H) Ceramic Capacitor Capable Package DFN(PLP)2020-8 For more details on RP402 IC, please refer to