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ST1S10PUR датащи(PDF) 11 Page - STMicroelectronics

номер детали ST1S10PUR
подробное описание детали  3 A, 900 kHz, monolithic synchronous step-down regulator
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST1S10PUR датащи(HTML) 11 Page - STMicroelectronics

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ST1S10
Application information
11/26
where TON is the ON time of the internal switch, given by:
TON = D/FS
The inductor should be selected with saturation current (ISAT) equal to or higher than the
inductor peak current, which can be calculated with the following equation:
IPK = IO + (ΔISW/2), ISAT ≥ IPK
The inductor peak current must be designed so that it does not exceed the switching current
limit.
5.7
Inductor (0.8 V < VOUT < 2.5 V)
For applications with lower output voltage levels (Vout < 2.5 V) the description in the previous
section is still valid but it is recommended to keep the inductor values in a range from 1µH to
2.2 µH in order to improve the DC-DC control loop behavior, and increase the output
capacitance depending on the VIN level as shown in the Figure 4 and Figure 5. In most
application conditions a 2.2 µH inductor is the best compromise between DC-DC control
loop behavior and output voltage ripple.
5.8
Function operation
5.8.1
Sync operation
The ST1S10 operates at a fixed frequency or can be synchronized to an external frequency
with the SYNC pin. The ST1S10 switches at a frequency of 900 kHz when the SYNC pin is
connected to ground, and can synchronize the switching frequency between 400 kHz to 1.2
MHz from an external clock applied to the SYNC pin. When the SYNC feature is not used,
this pin must be connected to ground with a path as short as possible to avoid any possible
noise injected in the SYNC internal circuitry.
5.8.2
Inhibit function
The inhibit pin can be used to turn OFF the regulator when pulled down, thus drastically
reducing the current consumption down to less than 6 µA. When the inhibit feature is not
used, this pin must be tied to VIN to keep the regulator output ON at all times. To ensure
proper operation, the signal source used to drive the inhibit pin must be able to swing above
and below the specified thresholds listed in the electrical characteristics section under VINH.
Any slew rate can be used to drive the inhibit pin.
5.8.3
OCP (over-current protection)
The ST1S10 DC-DC converter is equipped with a switch over-current protection. In order to
provide protection for the application and the internal power switches and bonding wires, the
device goes into a shutdown state if the switch current limit is reached and is kept in this
condition for the TOFF period (TOFF(OCP) = 135 µs typ.) and turns on again for the TON period
(TON(OCP) = 22 µs typ.) under typical application conditions. This operation is repeated cycle
by cycle. Normal operation is resumed when no over-current is detected.


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