RT8092 2 3MHz 4A High Efficiency Step-Down Converter with I C Interface General Description select V voltage level, peak current limit level, PWM The RT8092 is a Peak-Current Mode Pulse-Width- OUT 2 control mode, and so on. Other features include soft-start, Modulated (PWM) step-down DC/DC converter with I C auto discharge, lower internal reference voltage, over- control interface. Capable of delivering 4A continuing output temperature, and over-current protection. current over a wide input voltage range from 2.5V to 5.5V, the RT8092 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other Features power sources within the range such as cellular phones, 2.5V to 5.5V Input Range PDAs and handy-terminals. Low Operation Quiescent Current Internal synchronous rectifier with low R dramatically Normal Mode I < 60A DS(ON) Q reduces conduction loss at PWM mode. No external Low Power Mode I < 15A Q Schottky barrier diode is required in practical application. Output range From 0.3V to 5.5V The RT8092 enters low-dropout mode when normal PWM Bank 0 : 0.3V to 0.7V cannot provide regulated output voltage by continuously Bank 1 : 0.6V to 1.4V turning on the upper P-MOSFET. The RT8092 enters shut- Bank 2 : 1.2V to 2.8V down mode and consumes less than 5A when the EN Bank 3 : 2.4V to 5.5V pin is pulled low. The switching ripple is easily smoothed- The Default Value is 2.8V (VSEL = High) and 1V out by small package filtering elements due to a fixed (VSEL = Low) operation frequency of 3MHz. This along with small 4A Continuing Output Current WL-CSP-15B 1.2x2 (BSC) and WQFN-14L 3.5x3.5 Support DVS in the Same Bank packages provides small PCB area applications. V Adjusting Range (max, min) is Settable OUT High Efficiency To increase battery life time, the RT8092 provides low 90% at 5V 2.8V with 1.5A Load power mode with I < 15A in standby and light-load Q 3MHz Fixed-Frequency PWM Operation applications. The RT8092 also includes Dynamic Voltage Auto-PSM/PWM or Force-PWM Selectable Scaling (DVS) for system low power applications. Support Remote Ground Sensing for Accurate 2 The I C interface let the RT8092 controllable flexibly to Output Voltage Simplified Application Circuit RT8092 Input Power PVIN LX Output Load AVDD GNDR VOUT PGND Enable EN SCL 2 I C Control SDA AGND VOUT Select VSEL Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8092-02 May 2015 www.richtek.com 1RT8092 Dedicated Hardware Pin to Immediately Switch Ordering Information RT8092 Nominal Output Voltage Setting Output Discharging when Turning Off Package Type WSC : WL-CSP-15B 1.2x2 (BSC) Over-Current Protection QW: WQFN-14L 3.5x3.5 (W-Type) OC Level Settable Lead Plating System Over-Temperature Protection G : Green (Halogen Free and Pb Free) Integrated Soft-Start Function (For WQFN-14L 3.5x3.5 Only) 2 Enabling Control by Enable Pin and I C Register VSEL Option Setting by Software VSEL = High / Low, the target voltage 2 I C Interface follows as below table. 2 I C Communication allowed Even in Off-State Default : 2.8V / 1V (EN = L) JC : 1.8V / 1.2V UR : 2.8V / 2.5V Support Fast Mode (400kbps) AB : 1.0V / 1.1V Registers Setting Retained in Off-State (EN = L) CF : 1.2V / 1.5V RoHS Compliant and Halogen Free : : Applications Note : Richtek products are : Cellular Telephones RoHS compliant and compatible with the current require- Personal Information Appliances ments of IPC/JEDEC J-STD-020. Wireless and DSL Modems Suitable for use in SnPb or Pb-free soldering processes. MP3 Players Portable Instruments VSEL Option : (Unit : V) Code Voltage Code Voltage Code Voltage Marking Information A 1.0 B 1.1 C 1.2 For marking information, contact our sales representative D 1.3 E 1.4 F 1.5 directly or through a Richtek distributor located in your G 1.6 H 1.7 J 1.8 area. K 1.9 L 2.0 M 2.1 N 2.2 P 2.3 Q 2.4 R 2.5 S 2.6 T 2.7 U 2.8 V 2.9 W 3.0 X 3.3 Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8092-02 May 2015 2