RT8088A 2 2.7MHz 3A Step-Down Converter with I C Interface General Description Features zz z zz 2.5V to 5.5V Input Voltage Range The RT8088A is a full featured 5.5V, 3A, Constant-On- zz z zz Current Mode COT Control Loop Design Time (COT) synchronous step-down converter with two zz z zz Fast Transient Response integrated MOSFETs. The current mode COT operation zz z zz Internal 48m and 22m Synchronous Rectifier with internal compensation allows the transient response zz z zz Highly Accurate V Regulation Over Load/Line OUT to be optimized over a wide range of loads and output Range capacitors to efficiently reduce external component count. zz z zz Robust Loop Stability with Low-ESR C OUT The RT8088A provides up to 3MHz switching frequency zz z zz RoHS Compliant and Halogen Free to minimize the size of output inductor and capacitors. The RT8088A is available in the WL-CSP-15B 1.31x2.11 Applications (BSC) package. z Distributed Power Systems Ordering Information z Enterprise Servers, Ethernet Switches & Routers, and RT8088A Global Storage Equipment Package Type z Telecom & Industrial Equipment WSC : WL-CSP-15B 1.31x2.11 (BSC) Note : Pin Configurations Richtek products are : (TOP VIEW) RoHS compliant and compatible with the current require- PVIN A1 A2 A3 PGND ments of IPC/JEDEC J-STD-020. LX B1 B2 B3 PVIN PGND Suitable for use in SnPb or Pb-free soldering processes. LX PVIN C1 C2 C3 PGND PGND Marking Information D1 D2 D3 AVIN SDA 1J : Product Code EN AGND E1 E2 E3 FB W : Date Code 1JW SCL WL-CSP-15B 1.31x2.11 (BSC) Simplified Application Circuit RT8088A LX V V PVDD OUT IN FB AVDD PGND Enable EN 2 SDA I C AGND SCL Control Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS8088A-00 October 2013 www.richtek.com 1RT8088A Functional Pin Description Pin No. Pin Name Pin Function A1, B1, C1 PVIN Input Supply Voltage, 2.5V to 5.5V. Switch Node. The Source of the internal high-side power MOSFET, and Drain of A2, B2 LX the internal low-side (synchronous) rectifier MOSFET. A3, B3, C2, C3 PGND Power Ground. D1 AVIN Analog Circuit Input Supply Voltage. D2 EN Enable Control Input. Pull high to enable. 2 D3 SDA I C Data Signal. E1 AGND Analog Ground Should be Electrically Connected to GND Close to the Device. 2 E2 SCL I C Clock Signal. E3 FB Feedback Voltage Input. Function Block Diagram EN AVIN UVLO Shutdown Control LX OTP TON PVIN Error Amplifier Comparator + - + FB Logic 0.8V + LX Driver - Control R C Current Limit V C REF COMP Detector SDA 2 LX I C Control Current SCL PGND Sense LX AZC AGND Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS8088A-00 October 2013 2