NCP3170 Datasheet, PDF (1/25 Pages) ON Semiconductor – Synchronous PWM Switching Converter

NCP3170
Synchronous PWM
Switching Converter
The NCP3170 is a flexible synchronous PWM Switching Buck
Regulator. The NCP3170 operates from 4.5 V to 18 V, sourcing up to
3 A and is capable of producing output voltages as low as 0.8 V. The
NCP3170 also incorporates current mode control. To reduce the
number of external components, a number of features are internally set
including soft start, power good detection, and switching frequency.
The NCP3170 is currently available in an SOIC−8 package.
Features
• 4.5 V to 18 V Operating Input Voltage Range
• 90 mW High−Side, 25 mW Low−Side Switch
• FMEA Fault Tolerant During Pin Short Test
• 3 A Continuous Output Current
• Fixed 500 kHz and 1 MHz PWM Operation
• Cycle−by−Cycle Current Monitoring
• 1.5% Initial Output Accuracy
• Internal 4.6 ms Soft−Start
• Short−Circuit Protection
• Turn on Into Pre−bias
• Power Good Indication
• Light Load Efficiency
• Thermal Shutdown
• These are Pb−Free Devices
Typical Applications
• Set Top Boxes
• DVD/ Blu−ray™ Drives and HDD
• LCD Monitors and TVs
• Cable Modems
• PCIe Graphics Cards
• Telecom/Networking/Datacom Equipment
• Point of Load DC/DC Converters
V_IN
C1
22 mF
VIN
L1 4.7 mH
VSW
EN
NCP3170
PG
3.3 V
R1
COMP
C_C
AGND
FB1
PGND
C2, C3
22 mF
R2
R_C
http://onsemi.com
8
1
SOIC−8 NB
CASE 751
MARKING DIAGRAM
8
3170x
ALYW
G
1
3170x
A
L
Y
W
G
= Specific Device Code
x = A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
PGND
V_IN
AGND
FB
V_SW
PG
EN
COMP
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP3170ADR2G SOIC−8 2500 / Tape & Reel
(Pb−Free)
NCP3170BDR2G SOIC−8 2500 / 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 Specifications
Brochure, BRD8011/D.
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 − Rev. 1
Publication Order Number:
NCP3170/D