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ST1S12XX Scheda tecnica(PDF) 1 Page - STMicroelectronics

Il numero della parte ST1S12XX
Spiegazioni elettronici  Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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February 2008
Rev 2
1/20
20
ST1S12xx
Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or
adjustable step-down switching regulator in TSOT23-5L
Features
Step-down current mode PWM (1.7 MHz) DC-
DC converter
3% DC output voltage tolerance
Synchronous rectification
Fixed output voltage 1.2 V, 1.8 V, and ADJ
(available on request 1.5 V, 2.5 V and 3.3 V)
Enable function
Internal soft start
Typical efficiency: > 90%
0.7 A output current capability
Not switching quiescent current: max 600 µA
over temperature range
RDSON typ. 250 mΩ and 400 mΩ
Uses tiny capacitors and inductors
Operative junction temp. -40°C to 125°C
Available in TSOT23-5L package
Description
The ST1S12Gxx is a step down DC-DC converter
optimized for powering low-voltage digital cores in
HDD applications and, generally, to replace the
high current linear solution when the power
dissipation may cause high heating of the
application environment. It provides up to 0.7 A
over an input voltage range of 2.5 V to 5.5 V. A
high switching frequency (1.7 MHz) allows the
use of tiny surface-mount components. In addition
to the resistor divider to set the output voltage
value, only an inductor and two capacitors are
required. Moreover, a low output ripple is
guaranteed by the current mode PWM topology
and by the use of low ESR SMD ceramic
capacitors. The device is thermally protected and
the current is limited to prevent damage due to
accidental short-circuit. The ST1S12Gxx is
available in the TSOT23-5L package.
TSOT23-5L
Table 1.
Device summary
Part numbers
Order codes
Package
ST1S12XX
ST1S12GR
TSOT23-5L
ST1S12XX12
ST1S12G12R
TSOT23-5L
ST1S12XX18
ST1S12G18R (1)
TSOT23-5L
1.
Available on request.
www.st.com


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