LXDC55FAAA-203 Micro DC-DC converter 1. Features Wide Input voltage range : 4.0V to 14.0V User Adjustable Output voltage : 0.8 to 5.3V Small footprint Buck converter for up to 1.5A output current application Low EMI noise by using an inductor-embedded ferrite substrate High efficiency using synchronous rectifier technology at 2MHz operation Superior transient response using quasi-fixed-frequency COT technology Seamless Power-Save Mode Transition Power-Good function ,Over current protection, Over temperature protection Quiescent Current of 150 A (typ.) 2. Description The LXDC55F series is an easy-to-use synchronous step-down DC-DC converter optimized for applications with high power density. The device utilizes an inductor-embedded ferrite substrate, and the substrate eliminates radiated EMI noise and conduction noise efficiently. With its wide operating input voltage range of 4 V to 14 V, the devices are ideally suited for systems powered from either a Li-Ion or other batteries, as well as from 12-V intermediate power rails. It supports up to 1.5 A of continuous output current at output voltages between 0.8 V and 5.3 V The LXDC55F series utilizes a constant on time feedback technology and has superior load transient response. It has a unique circuit that roughly keeps the switching frequency constant, which makes it easy to filter the switching noise. The output voltage of LXDC55F series can be adjusted from 0.8 V to 5.3 V by using a resistor (RFB) between FB pin and GND pin. In terms of resistor value is calculated by RFB = 7.28/(Vout-0.8V) 1.6 kohm The LXDC55F series has Power Good Output function. Its to indicate whether the output voltage has reached its appropriate level or not. The device has an internal soft-start function to control the output voltage slope during start-up. In power-save mode, the devices show quiescent current of about 150 A from VIN. Power-save mod e, it enters automatically and seamlessly if load is small, maintains high efficiency over the entire load range. 3. Typical Application Circuit 1 July 2016 LXDC55FAAA-203 Micro DC-DC converter 4. Mechanical details 4-1 Outline Top View Side View Bottom View Unit:(mm) Mark Dimension Mark Dimension L 5.0 +/- 0.2 e 1.1 W 5.7 +/- 0.2 f 0.6 T 2.1 MAX g 0.35 a 0.25 h 0.6 b 0.7 i 0.35 c 0.4 j 1.0 d 0.8 4-2. Pin Function Pin No. Symbol I/O Description This is the ON/OFF control pin of the device. The device is in shutdown when the voltage to this pin is below 0.3V. Pulling this pin above 0.9V enables the device with soft start. This pin should not be 1 EN Input left floating. EN=H: Device ON, EN=L: Device OFF 2 NC - No connection 3,4,5 Vin Input Vin pin supplies current to the LXDC55F internal regulator. 6,12,13,14 GND - Ground pin Regulated voltage output pin. 7,8,9 Vout Output Apply output load between this pin and GND. Power good voltage output pin (Open drain). This is to indicate 10 PG Output whether the output voltage has reached its appropriate level or not. 11 FB Input External resistor connection pin for output voltage setting 2 July 2016