SA57254-30GW Datasheet, PDF (2/18 Pages) NXP Semiconductors – CMOS switching regulator (PWM controlled)

Philips Semiconductors
CMOS switching regulator (PWM controlled)
Product data
SA57254-XX
GENERAL DESCRIPTION
The SA57254-XX is a fully 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 SA57254-XX has a built-in soft-start circuit which reduces
inrush current and voltage overshoot during start-up. A low
resistance CMOS power FET, which has low leakage current and
low parasitic capacitance, is on-chip.
FEATURES
• Operates from 0.7 to 9 V_DC
• Ultra low operating supply current—typically 17 µA
• Built-in power FET
• 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 a 5-lead small outline surface mount package
(SOP003)
APPLICATIONS
• Mobile and portable phones
• Instrumentation and industrial products
• Other portable, battery-operated equipment
SIMPLIFIED SYSTEM DIAGRAM
V_BATT
SW 5
V_{DD 2}
SA57254-XX
PWM CONTROL
FB 1
V_REF
R
V_OUT
R
SOFT START
GND
4
SA57254-XX as a boost (step-up) converter.
Figure 1. Simplified system diagram.
SL01501
2003 Nov 11
2