Datasheet Power Supply IC Series for TFT-LCD Panels Multi-Channel System Power Supply IC BM81028AMWV General Description Features BM81028AMWV is a system power supply IC for Input voltage range: 2.7V to 5.5V TFT-LCD panels which are used in monitors, notebook Standby current: 1.4 A (Typ) type displays, and tablets. Operating temperature range: -40 to +85 This IC incorporates HAVDD, VCOM amplifier in addition Step-down DC/DC converter 2-channels to the power supply for panel driver (SOURCE, GATE, (Synchronous rectification) and LOGIC power supplies). Step-up DC/DC converter Moreover, this IC has a built-in EEPROM for sequence (Integrated load switch and Synchronous rectification) and output voltage setting retention. HAVDD amplifier (8bit Resolution) VCOM amplifier (8bit Resolution) Applications Positive charge pump (Integrated diode) TFT-LCD Panels which are used in Negative charge pump 2 Monitors, Note PCs and Tablets. I C Interface Output Voltage Setting Control Function (Integrated EEPROM) Switching frequency switching function (600kHz,1200kHz) Protection circuits Under-Voltage Lockout Thermal Shut Down Over-Current Protection Over-Voltage Protection Short Circuit Protection (Timer Latch type) Input tolerant (SCL, SDA,EN) Package W(Typ) D(Typ) H(Max) UQFN28V4040A 4.0mm x 4.00mm x 1.00m Typical Application Circuit Fig.1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0313AAF00430-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/44 TSZ2211114001 12.May.2015 Rev.00322 23 24 25 26 27 28 DDatasheetatasheet BM81028AMWV Pin Configuration Fig.2 Pin Configuration Pin Descriptions Pin Pin Pin Pin Function Function No. Name No. Name 1 DRN Negative charge pump driver pin 15 SWB1 Step-down DC/DC switching pin 1 2 AVDDP AVDD input 16 PVCC1 Step-down DC/DC power supply input 3 HAVDD HAVDD amplifier output 17 SWB2 Step-down DC/DC switching pin 2 4 VCOM VCOM amplifier output 18 PGND2 Step-down/-up DC/DC ground 5 GND Ground 19 SW Step-up DC/DC switching pin 6 FAULT FAULT signal output 20 AVDD Step-up DC/DC output 7 VCC Power supply input 21 AVDD S Step-up DC/DC output feedback 8 SCL Serial clock input (I2C) 22 PVCC2 Step-up DC/DC load switch input 9 SDA Serial clock data input (I2C) 23 VLSO Step-up DC/DC load switch output 10 EN Enable input 24 VGL Negative charge pump feedback 11 VREG Inner power supply output 25 CPGND Charge pump ground 12 VDD2 Step-down DC/DC output feedback input 2 26 VGH Positive charge pump feedback 13 VDD1 Step-down DC/DC output feedback input 1 27 CPP Built-in Positive charge pump switching Di output 14 PGND1 Step-down DC/DC ground 28 DRP Positive charge pump driver pin www.rohm.com TSZ02201-0313AAF00430-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/44 TSZ2211115001 12.May.2015 Rev.003 DRN AVDD S AVDDP AVDD HAVDD SW VCOM PGND2 GND SWB2 FAULT PVCC1 VCC SWB1 8 9 10 11 12 13 14