Datasheet Single-chip Type with Built-in FET Switching Regulator Series Step-up and inverted Output Power Supply for TFT-LCD Displays BD83854GWL General Description Key Specifications BD83854GWL is a step-up switching regulator and Input Voltage Range 2.5V to 4.5V charge pump inverter for small TFT-LCD Displays. It has Output Boost Voltage 5.4V(typ) a wide input voltage range of 2.5V to 4.5V that is Output Inverted Voltage -5.4V(typ) suitable for portable applications. In addition, its small Maximum Current 50mA(max) package design is ideal for miniaturizing the power Operating Frequency 1.0MHz(typ) supply. Efficiency >85 %(typ) Features Output Voltage Accuracy 2 %(typ) Wide input voltage range of 2.5V to 4.5V Standby Current 1A(max) High frequency operation Output Discharge Independent ON/OFF Package W(Typ) x D(Typ) x H(Max) signal(STBYP, STBYN) Circuit protection Over Current Protection (OCP) Short Current Protection (SCP) Under Voltage Lock Out (UVLO) Thermal Shutdown (TSD) Applications TFT LCD Smart phones TFT LCD Tablets UCSP50L1C 1.80mm x 1.50mm x 0.57mm Typical Application Circuit LLX 4.7H LX VREG VIN VIN 2.5V to 4.5V C1 CVREG 4.7F 4.7F PGND1 PGND2 V+ VOUTP 5.4V/max50mA AGND CVOP 4.7F CP1 STBYP CCP 2.2F STBYN CP2 V- VOUTN -5.4V/max50mA CVON 4.7F Figure 1. Application Circuit Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0242AAJ00030-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/19 TSZ22111 15 001 29.Aug.2014 Rev. 002 BD83854GWL Contents General Description .................................................................................................................................................... 1 Features ....................................................................................................................................................................... 1 Applications ................................................................................................................................................................ 1 Key Specifications ...................................................................................................................................................... 1 Package W(Typ) x D(Typ) x H(Max) ....................................................................................................................... 1 Typical Application Circuit ......................................................................................................................................... 1 Pin Configuration ........................................................................................................................................................ 3 Pin Description............................................................................................................................................................ 3 Block Diagram ............................................................................................................................................................. 4 Absolute Maximum Ratings (Ta = 25C) ................................................................................................................... 4 Recommended Operating Conditions ...................................................................................................................... 4 Electrical Characteristics (Unless otherwise specified V =3.7V Ta=25C) .......................................................... 5 IN Typical Performance Curves ..................................................................................................................................... 6 Application Information ........................................................................................................................................... 11 Description of Protection Circuits ....................................................................................................................... 11 Application Example ............................................................................................................................................. 13 Selection of External Components ...................................................................................................................... 13 Power Dissipation ..................................................................................................................................................... 14 I/O Equivalent Circuit ............................................................................................................................................... 15 Operational Notes ..................................................................................................................................................... 16 Ordering Information ................................................................................................................................................ 18 Physical Dimension, Tape and Reel Information ................................................................................................... 18 Revision History ....................................................................................................................................................... 19 www.rohm.com TSZ02201-0242AAJ00030-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/19 TSZ22111 15 001 29.Aug.2014 Rev. 002