STBB2 Datasheet, PDF (1/25 Pages) STMicroelectronics – 800 mA 2.5 MHz, high efficiency dual mode buck-boost DC-DC converter

STBB2
800 mA 2.5 MHz, high efficiency dual mode
buck-boost DC-DC converter
Datasheet - production data
• Cellular phones
Flip Chip 20 (2.1 x 1.8 mm)
Features
• Operating input voltage range from 2.4 V to
5.5 V
• ± 2% output voltage tolerance over process
and temperature variations
• Bypass power save function
• Selectable output voltage with dedicated VSEL
pin
• Very fast line and load transients
• 2.5 MHz switching frequency
• Power save mode (PS) at light load
• Typical efficiency higher than 90%
• 50 µA max. quiescent current
• Flip Chip 20 bumps 0.4 mm pitch 2.1 x 1.8 mm
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
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
voltage is within the battery voltage range. The
low-R_DS(on) N-channel and P-channel MOSFET
switches are integrated and help to achieve high
efficiency. The MODE pin allows the selection
between auto mode and forced PWM mode,
taking advantage from either lower power
consumption or best dynamic performance. The
bypass function allows the battery power saving.
In this operating mode, the high-side switches are
turned on so that the output voltage is equal to the
input voltage; in this condition the current
consumption is reduced to a maximum of 5 µA.
The device also includes soft-start control,
thermal shutdown, and current limit. The STBB2
is packaged in Flip Chip 20 bumps with 0.4 mm
pitch.
Applications
• Memory card supply
Order codes
STBB2JAD-R
STBB2J29-R
STBB2J30-R
Table 1. Device summary
Markings
Packaging
BB2
Tape and reel
B229
Tape and reel
B230
Tape and reel
Output voltages
Adjustable
2.9 V / 3.4 V
3.0 V / 3.3 V
February 2014
This is information on a product in full production.
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