Datasheet 1.75V to 4.5V, 10mA 1ch Synchronous Boost DC/DC Converter BU33DV5G General Description Key Specifications The BU33DV5G devices provide a power supply solution for products powered by either two-cell alkaline, Input voltage range: 1.75V to 4.5V NiCd or NiMH, or one-cell Li-ion or Li-polymer battery. Output voltage range: 3.23V to 3.37V Output currents can go as high as 10mA while using Average output Current: 10mA(Max.) two alkaline, and discharge it down to 1.8 V. Switching frequency: 100KHz(Typ.) The boost converter is based on a fixed frequency, Standby current: 250A (Typ.) Pulse-width-modulation (PWM) controller using a Power-OFF Circuit Current 1.0A (max) synchronous rectifier to obtain maximum efficiency. The Operating temperature range: -25 to +85 maximum peak current in the boost switch is typically limited to a value of 10 mA. BU33DV5G output voltage is fixed by an internal resistor divider. The device is packaged in a 5-pin small SSOP5 package. Features Synchronous Boost DC/DC Converter(PWM) Package(s) W(Typ.) x D(Typ.) x H(Max.) 10mA Vout=3.3V, Vin=1.8V SSOP5 2.90mm x 2.80mm x 1.25mm UVLO-detect Voltage:1.65V(Typ.) UVLO-release Voltage:1.75V(Typ.) Thermal Shutdown Applications Two-Cell Alkaline, NiCd or NiMH or Single-CellLi Battery-Powered Products Portable Audio Players PDA Cellular Phones Personal Medical Products SSOP5 Typical Application Circuit(s) Typical Performance characteristics 3.3V ON Efficiency Ta=25 VOUT EN C2(4.7F) 100 OFF 3.0V 2.8V 90 2.4V 2.0V GND 80 1.8V VIN 70 60 VIN SW 50 40 C1(47F) 30 20 10 L1(22. H) 0 0.0 5.0 10.0 15.0 20.0 Figure 1. Application Circuit Io mA Figure 2. Efficiency Product structureSilicon monolithic integrated circuit This product is not designed for protection against radioactive rays . www.rohm.com TSZ02201-0Q1Q0AH00220-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/14 TSZ2211114001 14.Feb.2013 Rev.001 Efficiency % DatasheetDatasheet BU33DV5G Block diagram VOUT VIN Back gate Control EN CONTROL LEVEL DRIVER SHIFT LOGIC SW TSD OSC + - GND Figure 3. Circuit Block SSOP5 Pin Configuration 2.90.2 + 6 4 4 5 4 Terminal Symbol Pin No. Function circuit EN 1 EN=VIN: Power-ON B 12 3 EN=GND: Power-OFF +0.05 GND 2 GND A 0.13 0.03 VIN 3 Power supply input B S SW 4 Inductor connection terminal - +0.05 VOUT 5 Boost voltage output B 0.42 0.04 0.95 Dont use EN PIN at OPEN. 0.1 S (Unit : mm) Figure 4. Package Input-Output Equivalent Circuit I/O equivalent circuit diagram is as follows. www.rohm.com TSZ02201-0Q1Q0AH00220-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/14 TSZ2211115001 14.Feb.2013 Rev.001 1.25Max. 2.80.2 1.10.05 +0.2 1.6 0.1 0.050.05 0.2Min. - + - +