Synchronous Boost DC/DC Converter (Vout = 5V, Io = 2A, 1ch) BD1865GWL Features General Description Synchronous Boost DC/DC Converter The BD1865GWL devices provide a power supply solution Vout = 5V / Iomax = 2A for products powered by single-cell Li-ion battery. Output Automatically PFM/PWM Transition. currents can go as high as 2A while discharge it down to Efficiency: 90% 2A-5V (VIN=3.7V) 3.2V. Load Disconnect During Shutdown. With the MODE pin, BD1865GWL provides mode Circuit Current: 66uA (Io=0mA, Typ). selection of PFM/PWM MODE or Mixing-PWM MODE. Adjustable Output Voltage: 4.9V 5.2V In PFM/PWM MODE, the product switches automatically Power Supply Voltage Range (Vo=5V, Ta=65C): between PWM and PFM operation so that high efficiency is Iomax = 2.0A: 3.2V 4.5V. achievable over a wide range of load conditions. Iomax = 1.8A: 3.0V 3.2V. Mixing-PWM MODE can be prevented Audible Sound by Iomax = 1.5A: 2.7V 3.0V. switching noise at light loads. Iomax = 1.33A: 2.5V 2.7V. UVLO Detection: 2.1V (Max.). Switching Frequency: 2.5MHz. Typical Application Efficiency Thermal Shutdown. T=25 , PFM/PWM mode 16-pin WLCSP. 100 Short Circuit Protection 90 Over Output Voltage Protection 80 70 Applications 60 Single-Cell Li-ion Battery-Powered Portable Products 50 Tablet Terminal Device, Smartphone 40 VIN=2.5V 30 Package VIN=3.6V 20 16-pin WL-CSP package: UCSP50L1C VIN=4.5V 10 W (Typ) x D (Typ) x H (Max): 1.6mm x 1.6mm x 0.57mm 0 1 10 100 1000 10000 Iout mA Typical Application Circuit V IN L 0.47uH C IN R FIL 22uF 110 VIN LX C FIL 1uF OFF ON EN LX FB LX MODE LX GND GND V OUT GND VOUT CFB C R OUT 1 2pF PGND VOUT 22uFx3 330k PGND DISCHG R 2 62k Figure. 1 Application Circuit (PFM/PWM mode) Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays .w ww.rohm.com TSZ02201-0Q1Q0A900270-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/17 27. Jul. 2015 Rev. 002 TSZ22111 14 001 BD1865GWL Efficiency % BD1865GWL Pin Configuration TOP View 1 2 3 4 MODE GND PGND PGND A EN TEST LX LX B VIN TESTC LX LX C DIS FB VOUT VOUT D CHG Figure. 2 Pin Configuration Pin Description Pin No. Pin Name I/O Function Operation Mode Select Pin. A1 MODE I MODE=Low : PFM/PWM MODE (Note 1) MODE=High: Mixing-PWM MODE Analog Ground. This terminal is used as the ground reference of the internal A2, B2, C2 GND - circuit. A3, A4 PGND - Power Ground. Enable Pin. B1 EN I EN=Low : Disable EN=High : Enable B3, B4, C3, C4 LX I/O Inductor Connection Terminal. C1 VIN I Power Supply Input. D1 FB I Output Feedback Pin. Discharge Pin. D2 DISCHG I For PFM/PWM mode, this terminal can be used as VOUT discharge. For (Note 1) Mixing-PWM mode, this terminal should be shorted to MODE. D3, D4 VOUT O Boost Converter Output. (Note 1) Refer to Application Information (P.10) about MODE pin setting for Mixing-PWM mode. In addition, only during EN=L, the changing the operation mode is possible. Block Diagram VOUT OSC VIN VOUT UVLO Discharge DISCHG VIN LX EN Control Gate LX Logic Driver LX VIN LX MODE PGND TSD Err.Amp. PGND GND Soft Start FB Figure. 3 Functional Block Diagram www.rohm.com TSZ02201-0Q1Q0A900270-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/17 27. Jul. 2015 Rev.002 TSZ22111 15 001