STBB1XX Datasheet, PDF (1/20 Pages) STMicroelectronics – Buck-boost DC-DC converter

STBB1xx
1 A, high efficiency single inductor
dual mode buck-boost DC-DC converter
Preliminary data
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
Application
■ Single cell LI-ION and 3 cells alkaline, NI-MH
powered devices
■ Memory SD/MMC cards supply
■ Palmtop computers
■ Cell phones
■ Digital cameras
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
DFN10 (3 x 3 mm)
input voltage from 2.0 V to 5.5 V. The device can
operate with input voltages higher, equal 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 integrated low-R_DSon N-channel and P-
channel MOSFET switches contribute to achieve
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 3x3 mm.
Table 1. Device summary
Order codes
STBB1-18PUR
STBB1-25PUR
STBB1-28PUR
STBB1-33PUR
STBB1PUR
Marking
BB1 18
BB1 25
BB1 28
BB1 33
BB1
Output voltage
1.8 V
2.5 V
2.8 V
3.3 V
ADJ
February 2009
Rev 1
This is preliminary information on a new product in development or undergoing evaluation. Details are subject to change
without notice.
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