RP112x Series Low Noise 150 mA LDO Regulator No. EA-258-180621 OUTLINE The RP112x is a voltage regulator (LDO) with high output voltage accuracy, low-supply current, low On- resistance transistor, low noise output voltage and high ripple rejection. Each IC is composed of the followings: a voltage reference unit, an error amplifier, a resistor-net for output voltage setting, a current limit circuit, and a chip enable circuit. The RP112x features ultra-low noise and its Ripple Rejection is as low as 80 dB at f = 1 kHz, 75 dB at f = 10 kHz and 65 dB at f = 100 kHz. The Output Noise is also as low as Typ. 10 Vrms. It is kept the low level at any Output Voltage. RP112x is suitable for the power source for the portable music player and RF module that demands for higher level of noise reduction. SOT-23-5 and SC-88A packages, a 1-mm square DFN(PLP)1010- 4 package are available. FEATURES Supply Current ...................................................... Typ. 75 A Standby Current .................................................... Typ. 0.1 A Dropout Voltage .................................................... Typ. 0.20 V (I = 150 mA, V = 2.8 V) OUT OUT Ripple Rejection .................................................... Typ. 80 dB (f = 1 kHz) Typ. 75 dB (f = 10 kHz) Typ. 65 dB (f = 100 kHz) Output Voltage Accuracy ....................................... 1.0% Output Voltage Temperature Coefficient ............... Typ. 30 ppm/C Line Regulation ..................................................... Typ. 0.02%/V Packages .............................................................. DFN(PLP)1010-4, SC-88A, SOT-23-5 Input Voltage Range ............................................. 2.0 V to 5.25 V Output Voltage Range ........................................... 1.2 V to 4.8 V (0.1 V step) Short Current Limit ................................................ Typ. 40 mA Built-in Foldback Protection Circuit Output Noise ......................................................... Typ. 10 Vrms Ceramic capacitors are recommended to be used with this IC ..... 1.0 F or more APPLICATIONS Power source for portable communication equipment. Power source for electrical appliances such as cameras, VCRs and camcorders. Power source for battery-powered equipments. Power source for electrical home appliances. Power source for the portable music player Power source for RF module 1 RP112x No. EA-258-180621 SELECTION GUIDE (1) The output voltage, auto-discharge function , package for the ICs can be selected at the users request. Selection Guide Product Name Package Quantity per Reel Pb Free Halogen Free RP112Kxx1 -TR DFN(PLP)1010-4 10,000 pcs Yes Yes SC-88A 3,000 pcs Yes Yes RP112Qxx2 -TR-FE SOT-23-5 3,000 pcs Yes Yes RP112Nxx1 -TR-FE xx: Set output voltage (VSET) is selectable from 1.2 V to 4.8 V in 0.1 V step. The second decimal point of the voltage is described as below. 1.25 V: RP112x12x5 1.85 V: RP112x18x5 2.85 V: RP112x28x5 : Selections of CE pin polarity and Auto-discharge function are as shown below: (B) CE pin polarity: H active, Auto-discharge function: No (D) CE pin polarity: H active, Auto-discharge function: Yes BLOCK DIAGRAMS VDD VDD VOUT VOUT Noise Noise Reduction Reduction Vref Vref Current Current Limit Limit CE CE GND GND RP112xxxxB Block Diagram RP112xxxxD Block Diagram (1) Auto-discharge function quickly lowers the output voltage to 0 V by releasing the electrical charge in the external capacitor when the chip enable signal is switched from the active mode to the standby mode. 2