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AP2953AS8PR Datasheet(PDF) 4 Page - Wuxi Chipown Micro-electronics limited

No. de pieza AP2953AS8PR
Descripción Electrónicos  3A, 18V Synchronous Rectified Step-Down Converter
PDF  9 Pages
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Fabricante Electrónico  CHIPOWN [Wuxi Chipown Micro-electronics limited]
Página de inicio  https://www.chipown.com.cn/en/index.html
Logo CHIPOWN - Wuxi Chipown Micro-electronics limited

AP2953AS8PR Datasheet(HTML) 4 Page - Wuxi Chipown Micro-electronics limited

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AP2953A
Chipown
8/F, ChuangYuan Building
No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718
http://www.chipown.com.cn
V2.0
4 / 9
Functional Description
The AP2953A is a synchronous rectified, current-mode,
step-down regulator. It regulates input voltages from 4.75V
to 18V down to an output voltage as low as 0.925V, and
supplies up to 3A of load current.
The AP2953A uses current-mode control to regulate the
output voltage. The output voltage is measured at FB through
a resistive voltage divider and amplified through the internal
transconductance error amplifier. The voltage at the COMP
pin is compared to the switch current measured internally to
control the output voltage.
The converter uses internal N-Channel MOSFET switches to
step-down the input voltage to the regulated output voltage. Since
the high side MOSFET requires a gate voltage greater than the
input voltage, a boost capacitor connected between SW and BS is
needed to drive the high side gate. The boost capacitor is charged
from the internal 5V rail when SW is low.
When the AP2953A FB pin exceeds 20% of the nominal
regulation voltage of 0.925V, the over voltage comparator is
tripped and the COMP pin and the SS pin are discharged to GND,
forcing the high-side switch off.
Figure 3 –Functional Block Diagram



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