ST2S08B Datasheet, PDF (1/18 Pages) STMicroelectronics – Dual synchronous rectification, 1.5 A, 1.5 MHz adjustable step-down switching regulator

ST2S08B
Dual synchronous rectification, 1.5 A, 1.5 MHz
adjustable step-down switching regulator
Datasheet − production data
Features
■ Step-down current mode PWM (1.5 MHz) DC-
DC converter
■ Adjustable output voltage from 0.8 V
■ 2 % DC output voltage tolerance
■ Synchronous rectification
■ Integrated current limit
■ Inhibit function
■ Soft-start for start delay of 800 µs typ.
■ Typical efficiency: > 80 % at V_OUT = 1.2 V
■ 1.5 A output current capability
■ Non-switching quiescent current: max 1.5 mA
over temperature range
■ R_DS(ON) 150 mΩ (typ.)
■ Uses tiny capacitors and inductors
■ Available in QFN12L (4 x 4 mm)
QFN12L (4 x 4 mm)
ST2S08B is available in the QFN12L (4 x 4 mm)
package.
Description
The ST2S08B is a dual step-down DC-DC
converter optimized for powering low-voltage
digital cores in ODD applications and, generally,
to replace the high current linear solution when
the power dissipation may cause a high heating of
the application environment. It provides up to 1.5
A over an input voltage range of 3 V to 5.5 V. A
high switching frequency of 1.5 MHz allows the
use of tiny surface-mounted components as well
as a resistor divider to set the output voltage
value. Only an inductor and two capacitors are
required. A low output ripple is guaranteed by the
current mode PWM topology and the utilization of
low ESR SMD ceramic capacitors. The device is
thermally protected and current limited. The
Table 1. Device summary
Order code
Package
ST2S08BPQR
QFN12L (4 x 4 mm)
Packaging
Tape and reel
May 2012
This is information on a product in full production.
Doc ID 18290 Rev 2
1/18
www.st.com
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