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SA57254-30GW Datasheet(PDF) 9 Page - NXP Semiconductors

Part # SA57254-30GW
Description  CMOS switching regulator (PWM controlled)
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SA57254-30GW Datasheet(HTML) 9 Page - NXP Semiconductors

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Philips Semiconductors
Product data
SA57254-XX
CMOS switching regulator (PWM controlled)
2003 Nov 11
9
TECHNICAL DISCUSSION
General discussion
The SA57254-XX is a highly integrated boost-mode switching power
supply integrated circuit. Each device is set to provide a fixed output
voltage by having a fully compensated internal voltage feedback
loop. The SA57254-XX operates at a fixed frequency of 50 kHz and
can operate from a single alkaline cell (0.9 V) or up to 9 V.
The SA57254-XX has an internal common-source power switching
MOSFET which provides the PWM signal to the inductor. The
voltage error amplifier for maintaining a fixed output voltage, the
oscillator and a PWM generator are all in the package.
SL01503
1
VREF
5
4
SA57254-XX
GND
SW
FB
PWM CONTROL
SOFT START
R
R
VDD 2
Figure 23. Functional diagram.


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