STBB2JAD-R STMicroelectronics

STBB2 800 mA 2.5 MHz, high efficiency dual mode buck-boost DC-DC converter Datasheet - production data Cellular phones Description The STBB2 is a fixed frequency, high efficiency, buck-boost DC-DC converter which provides output voltages from 1.2 V to 4.5 V starting from Flip Chip 20 (2.1 x 1.8 mm) input voltage from 2.4 V to 5.5 V. The device can operate with input voltages higher than, equal to, or lower than the output voltage making the product suitable for single Li-Ion, multi-cell alkaline or NiMH applications where the output Features voltage is within the battery voltage range. The Operating input voltage range from 2.4 V to low-R N-channel and P-channel MOSFET DS(on) 5.5 V switches are integrated and help to achieve high efficiency. The MODE pin allows the selection 2% output voltage tolerance over process between auto mode and forced PWM mode, and temperature variations taking advantage from either lower power Bypass power save function consumption or best dynamic performance. The Selectable output voltage with dedicated VSEL bypass function allows the battery power saving. pin In this operating mode, the high-side switches are turned on so that the output voltage is equal to the Very fast line and load transients input voltage in this condition the current 2.5 MHz switching frequency consumption is reduced to a maximum of 5 A. Power save mode (PS) at light load The device also includes soft-start control, thermal shutdown, and current limit. The STBB2 Typical efficiency higher than 90% is packaged in Flip Chip 20 bumps with 0.4 mm 50 A max. quiescent current pitch. Flip Chip 20 bumps 0.4 mm pitch 2.1 x 1.8 mm Applications Memory card supply Table 1. Device summary Order codes Markings Packaging Output voltages STBB2JAD-R BB2 Tape and reel Adjustable STBB2J29-R B229 Tape and reel 2.9 V / 3.4 V STBB2J30-R B230 Tape and reel 3.0 V / 3.3 V February 2014 DocID022745 Rev 9 1/25 This is information on a product in full production. www.st.com 25Contents STBB2 Contents 1 Application schematic . 3 2 Block diagram 4 3 Absolute maximum ratings . 5 4 Pin configuration 6 5 Electrical characteristics . 8 6 Typical performance characteristics . 10 7 General description . 15 7.1 Dual mode operation 15 7.2 Enable pin 15 7.3 Bypass operation . 16 7.4 VSEL pin operation . 16 7.5 Protection features 17 7.5.1 Soft-start and short-circuit . 17 7.5.2 Undervoltage lockout . 17 7.5.3 Overtemperature protection 17 8 Application information . 18 8.1 Programming the output voltage . 18 8.2 Inductor selection . 18 8.3 Input and output capacitor selection . 19 8.4 Layout guidelines . 19 8.5 Product evaluation board . 20 8.6 Thermal consideration . 21 9 Package mechanical data 22 10 Revision history . 24 2/25 DocID022745 Rev 9