?Semiconductor Components Industries, LLC, 2007
December, 2007 - Rev. 0
1
Publication Order Number:
NCP1578/D
NCP1578
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
"Fixed 5.0 V/50 mA Internal Linear Regulator
"Adjustable PWM Output Voltage
"1.5% Accuracy 0.8 V Reference
"4.5 V to 24 V Battery/Adaptor Voltage Range
"Selectable Force PWM Mode
"Lossless, Programmable High Side MOSFET's R
DS(ON)
Current
Sensing
"Soft-start and Power-Up Sequencing
"Overvoltage Protection, Undervoltage Protection
"Programmable Delay Power Good Output
"Thermal Shutdown
"Housed in QFN20
"This is a Pb-Free Device
Typical Applications
"Network HUB, Switchers and Routers
"3-Cell and 4-Cell Li-ion Battery-Powered Devices
"Personal Computer Peripherals
"Microprocessors Power Supply
"Embedded Controller
"DSP and Core Processor
"Supply for LCD Display
QFN20
MN SUFFIX
CASE 485E
MARKING DIAGRAM
PIN CONNECTIONS
http://onsemi.com
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)
Device Package Shipping
ORDERING INFORMATION
NCP1578MNR2G QFN20
(Pb-Free)
4000/Tape & Reel
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.
PGND
PGDLY
PGOOD
SS
COMP
FPWM
EN_LDO
OCSET
FOFF
EN_SW
N1578
ALYWG
G
1
20
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