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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： | 12/21頁 |
| 文件大小： | 298K |
| 代理商： | 935269484115 |
Philips Semiconductors
Product data
SA57251-XX
CMOS switching regulator (PWM controlled)
2
2001 Aug 01
853–2271 26807
GENERAL 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).
FEATURES
Operates from 0.7 to 9 V
DC
Ultra low operating supply current—typically 17 A
ON/OFF power control
Uses external power NPN BJT
High efficiency—typically 83%
High precision output—typically ±2.4%
Operating temperature range of –40 to +85 °C
Available output voltages: 2.0, 2.5, 2.8, 3.0, 3.3, 3.6, 5.0 V
DC
Available in SOT23-5 surface mount package
APPLICATIONS
Mobile and portable phones
Instrumentation and industrial products
Other portable, battery-operated equipment
SIMPLIFIED SYSTEM DIAGRAM
SL01487
2
VREF
5
4
VOUT
VBATT
SA57251-XX
ON/OFF
GND
DRIVE
FB
PWM CONTROL
SOFT START
1
R
SA57251-XX as a boost (step-up) converter.
VDD
Figure 1. Simplified system diagram.
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