STBB1PUR Datasheet, PDF (1/21 Pages) STMicroelectronics – 1 A, high efficiency single inductor

STBB1XX
1 A, high efficiency single inductor
dual mode buck-boost DC-DC converter
Features
■ Buck-boost DC-DC converter
■ Operating input voltage range from 2.0 V to 5.5
V
■ 2% DC feedback voltage tolerance
■ Synchronous rectification
■ Shutdown function
■ 1.5 MHz switching frequency
■ Power save mode at light load
■ Typical efficiency: > 94 %
■ 1 A output current capability
■ Shutdown current < 1 µA
■ Available in DFN10 (3 x 3 mm)
Applications
■ Single cell Li-Ion and 3 cells alkaline, Ni-MH
powered devices
■ SD/MMC memory card supply
■ Palmtop computers
■ Cell phones
■ Digital cameras
DFN10 (3 x 3 mm)
integrated low-R_DSon N-channel and P-channel
MOSFET switches contribute to its high efficiency.
The MODE pin allows selecting between auto
mode and forced PWM mode thus taking benefit
either of lower power consumption or best
dynamic performance. The device includes also
soft-start control, thermal shutdown and current
limit. The STBB1 is packaged in DFN10 (3 x 3
mm).
Description
The STBB1 is a fixed frequency, high efficiency,
buck-boost DC-DC converter able to provide
output voltages ranging from 1.2 V to 5.5 V and
input voltages from 2.0 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 lithium-Ion, multicell
alkaline or NiMH applications where the output
voltage is within the battery voltage range. The
Table 1. Device summary
Order code
Marking
STBB1PUR
BB1
Output voltage
ADJ
September 2010
Doc ID 15474 Rev 5
1/21
www.st.com
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