Datasheet 6.0V28V, 1.2A 1ch 1ch Step-Down Switching Regulator BD9E151NUX Key Specifications General Description Input Voltage 628 V The BD9E151NUX is a 28V, 1.2A diode-rectification Ref. Precision (Ta=25) 1.0 % buck converter that integrated internal high-side 30V Max Output Current 1.2 A (Max.) Power MOSFET. To increase efficiency at light loads, a Operating Temperature -40~85 pulse skipping is automatically activated. Furthermore, the 0uA shutdown supply current allows the device to be used in battery powered application. Current mode Packages control with internal slope compensation simplifies the VSON008X2030 2.00mm x3.00mm x 0.60mm external component count while allowing the use of ceramic output capacitors. Features High and Wide Input Range (VIN=6V~28V) 30V/80m Internal Power MOSFET 600kHz Fixed Operating Frequency Feedback Pin Voltage 1.0V1.0% VSON008X2030 Internal Over Current Protection(OCP), Under Applications Voltage Locked Out(UVLO), Over Voltage Surveillance Camera Applications Protection(OVP), Thermal Shut down(TSD) OA Applications 0A Low Shutdown Supply Current 12V, 24V Distributed Power Systems VSON008X2030 package Typical Application Circuits CBST: 0.1uF LO: 15uH 1 8 BST LX VOUT CO: 47uF/16V D1 CVCC: 10uF/35V 2 7 VIN VIN GND 3 6 ON/OFF EN VC control R4: C1: 10000pF 4 5 SS FB R: CSS: 0.047uF R5: Figure 1. Typical Application Circuit StructureSilicon Monolithic Integrated Circuit This product is not designed for normal operation within a radioactive Product structureSilicon monolithic integrated circuit This product has not designed protection against radioactive rays . www.rohm.com TSZ02210-0Q3Q0AZ00160-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/19 2015.02.04 Rev.002 TSZ2211114001 BD9E151NUX Pin Configuration BST 1 8 Lx 2 7 VIN GND Back side PAD EN 3 6 VC 4 5 SS FB Figure 2. Pin Configuration (TOP VIEW) Pin Description Pin No. Pin Name Description The pin is power supply for floating Power NMOS driver. Connect bypass capacitor 1 BST between the pin and LX pin for bootstrap operation. 2 VIN Input supply. Place bypass capacitor as close as possible to this pin. Enable input pin. Apply more than 2.4V to start-up the DCDC. This pin is pulled down by 3 EN 700k, apply less than 0.8V or open to shutdown the DCDC. 4 SS Soft start pin. An external capacitor connected to this pin sets output rise time. 5 FB Inverting node of the gm amplifier. Error amplifier output, and input to the PWM comparator. Connect phase compensation 6 VC components to this pin. 7 GND Ground. 6 LX Place schottky barrier diode as close as possible and inductor to this pin. Back side - PAD for radiation of heat. Connect to GND is recommended. PAD Block Diagram ON/OFF EN VIN TSD UVLO Reference REG VREF Current Sense AMP shutdown BST Current Error FB Comparator AMP - 80m + - 1.0V VOUT + RQ LX + S SS Soft Start GND Oscillator VC Figure 3. Block Diagram www.rohm.com TSZ02210-0Q3Q0AZ00160-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/19 2015.02.04 Rev.002 TSZ2211115001