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參數資料
| 型號： | 935269484115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | 1.50 MM, PLASTIC, MO-178, SOT-25, SOT-23, SOP-5 |
| 文件頁數： | 11/21頁 |
| 文件大小： | 298K |
| 代理商： | 935269484115 |
Philips Semiconductors - PIP - SA57251-XX; CMOS switching regulator (PWM controlled)
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Product Information
SA57251-XX; CMOS
switching regulator
(PWM controlled)
Information as of 2002-08-07
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Download datasheet
Block diagram
Parametrics
topGeneral description
The SA57251-XX is a highly integrated DC/DC converter circuit. Efficient, compact power conversion is
achieved with a pulse width modulation (PWM) controlled switching regulator circuit designed using
CMOS processing. Low ripple and high efficiency of typically 83% are achieved through PWM control. The
regulator has a high precision output with ±2.4% accuracy. Few external components are required. The
SA57251-XX has an ON/OFF control which may be used to turn off the converter and conserve power in
battery powered applications. A built-in, soft-start circuit reduces inrush current and voltage overshoot
during start up. The PWM control circuit is designed to drive an external low resistance NPN bipolar
junction transistor (BJT).
topFeatures
q
Operates from 0.7 to 9 V DC
q
Ultra low operating supply current—typically 17 uA
q
ON/OFF power control
q
Uses external power NPN BJT
q
High efficiency-typically 83%
q
High precision output-typically ±2.4%
q
Operating temperature range of -40 to +85 °C
q
Available output voltages: 2.0, 2.5, 2.8, 3.0, 3.3, 3.6, 5.0 V DC
q
Available in SOT23-5 surface mount package
topApplications
q
Mobile and portable phones
q
Instrumentation and industrial products
q
Other portable, battery-operated equipment
file:///G|/imaging/BITTING/cpl_IMAGES/PhilipsSe...51-XX;CMOSswitchingregulator(PWMcontrolled).htm (1 of 3) [Aug-28-2002 9:19:31 AM]
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