EP5348UI 400mA Synchronous Buck Regulator with Integrated Inductor RoHS Compliant Halogen Free Description Features The EP5348UI delivers the optimal trade-off Integrated Inductor Technology between footprint and efficiency. It is a perfect 400mA continuous output current alternative to replace less efficient LDOs in space 2.0mm x 1.75mm x 0.9mm uQFN package constrained applications that require improved efficiency. Small Solution Footprint The EP5348UI is a 400mA PowerSoC which Efficiency, up to 90% integrates MOSFET switches, control, V Range 0.6V to V V OUT IN DROP OUT compensation, and the magnetics in a micro- Short circuit and over current protection QFN Package. This highly integrated DCDC solution offers up to 46-points better efficiency UVLO and thermal protection than the comparable LDO. A significant IC level reliability in a PowerSoC solution reduction in power loss and improved thermals are achieved. It enables extended battery life and helps Meet Energy Star requirements. Applications 95 VIN = 5.0V EP5348UI Applications where poor LDO efficiency LDO VOUT = 1.2V 85 creates: 75 o Thermal challenges 65 o Battery Life challenges 55 o Failure to meet Energy Star = 46-points 45 requirements 35 Space-constrained applications 25 Portable media players and USB peripherals 15 0.0 0.1 0.2 0.3 Load Current (A) Integrated magnetics enables a tiny solution footprint, low output ripple, and high reliability, while maintaining high efficiency. The complete solution size is similar to an LDO and much smaller than a comparable DCDC. Figure 1: Typical Application Schematic www.enpirion.com 05721 6/15/2011 Re v: B Efficiency (%) EP5348UI Ordering Information Pin Assignments (Top View) Part Number Package 14 13 EP5348UI 14-pin QFN T&R 1 NC(SW) 12 PVIN EP5348UI-E EP5348UI Evaluation Board 2 PGND 11 AVIN NC 3 EP5348UI 10 ENABLE 4 VFB 9 NC 5 AGND 8 NC 67 Figure 2: EP5348UI Pin Out Diagram (Top View) Pin Description PIN NAME FUNCTION NO CONNECT These pins are internally connected to the common switching node of the 1, 13, internal MOSFETs. NC (SW) pins are not to be electrically connected to any external signal, NC(SW) 14 ground, or voltage. However, they must be soldered to the PCB. Failure to follow this guideline may result in part malfunction or damage to the device. Power ground. Connect this pin to the ground electrode of the Input and output filter 2 PGND capacitors. NO CONNECT: These pins may already be connected inside the device. Therefore, they cannot be electrically connected to each other or to any external signal, voltage, or ground. 3, 8, 9 NC They must however be soldered to the PCB. Failure to follow this guideline may result in device damage. 4 VFB Feedback pin for external voltage divider network. Analog ground. This is the quiet ground for the internal control circuitry, and the ground 5 AGND return for external feedback voltage divider 6, 7 VOUT Regulated Output Voltage. Refer to application section for proper layout and decoupling. 10 ENABLE Output Enable. Enable = logic high Disable = logic low 11 AVIN Input power supply for the controller circuitry. Connect to VIN at a quiet point. 12 PVIN Input Voltage for the MOSFET switches. Enpirion 2011 all rights reserved, E&OE 2 www.enpirion.com 05721 6/15/2011 Rev: B NC(SW) VOUT NC(SW) VOUT