NCP1578 Datasheet, PDF (1/22 Pages) ON Semiconductor – Synchronous Step-Down Controller with 50 mA Linear Regulator

NCP1578
Product Preview
Synchronous Step-Down
Controller with 50 mA
Linear Regulator
The NCP1578 is a voltage mode synchronous step-down controller
for high performance systems intended to be used in battery-powered
systems. The NCP1578 includes a high efficiency PWM controller
with adjustable output, and a 5 V/50 mA linear regulator. A pin is
provided to enable or disable forced PWM mode of operation. An
internal power good voltage monitor tracks the SMPS output.
NCP1578 also features soft-start sequence, UVLO for linear regulator
and switcher, overvoltage protection, overcurrent protection, and
thermal shutdown. The IC is packaged in QFN20.
Features
•ăFixed 5.0 V/50 mA Internal Linear Regulator
•ăAdjustable PWM Output Voltage
•ă1.5% Accuracy 0.8 V Reference
•ă4.5 V to 24 V Battery/Adaptor Voltage Range
•ăSelectable Force PWM Mode
•ăLossless, Programmable High Side MOSFET's R_DS(ON) Current
Sensing
•ăSoft-start and Power-Up Sequencing
•ăOvervoltage Protection, Undervoltage Protection
•ăProgrammable Delay Power Good Output
•ăThermal Shutdown
•ăHoused in QFN20
•ăThis is a Pb-Free Device
Typical Applications
•ăNetwork HUB, Switchers and Routers
•ă3-Cell and 4-Cell Li-ion Battery-Powered Devices
•ăPersonal Computer Peripherals
•ăMicroprocessors Power Supply
•ăEmbedded Controller
•ăDSP and Core Processor
•ăSupply for LCD Display
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
QFN20
MN SUFFIX
CASE 485E
MARKING DIAGRAM
20
1
N1578
ALYWG
G
N1578 = Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb-Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
FPWM
EN_LDO
OCSET
FOFF
EN_SW
PGND
PGDLY
PGOOD
SS
COMP
ORDERING INFORMATION
Device
Package
Shipping
NCP1578MNR2G QFN20 4000/Tape & Reel
(Pb-Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
©Ă Semiconductor Components Industries, LLC, 2007
1
October, 2007 - Rev. P2
Publication Order Number:
NCP1578/D