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  ON Semiconductor Electronic Components Datasheet  

NCP3170 Datasheet

Synchronous PWM Switching Converter

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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−rayt Drives and HDD
LCD Monitors and TVs
Cable Modems
PCIe Graphics Cards
Telecom/Networking/Datacom Equipment
Point of Load DC/DC Converters
VIN
C1
22 mF
VIN
L1 4.7 mH
VSW
EN
NCP3170
PG
3.3 V
R1
COMP
CC
AGND
FB1
PGND
C2, C3
22 mF
R2
RC
www.onsemi.com
SOIC−8 NB
CASE 751
MARKING DIAGRAM
8
3170x
ALYW
G
1
3170x
x
A
L
Y
W
G
= Specific Device Code
= A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
PIN CONNECTIONS
PGND
VIN
AGND
FB
VSW
PG
EN
COMP
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP3170ADR2G SOIC−8 2,500/Tape & Reel
(Pb−Free)
NCP3170BDR2G SOIC−8 2,500/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, 2014
March, 2017 − Rev. 6
1
Publication Order Number:
NCP3170/D


  ON Semiconductor Electronic Components Datasheet  

NCP3170 Datasheet

Synchronous PWM Switching Converter

No Preview Available !

NCP3170
VDD
EN
UVLO
Power
Control
POR
(PC)
Reference
Soft Start
ORing
Circuit
FB +
Slope
S Compensation
Oscillator
SSETQ
+
RCLRQ
COMP
PG
998 mV
867 mV
728 mV
+
+
+
Soft Start
Complete
Over
Temperature
Protection
Driver
Voltage
Clamp
VCV
VCL
Pulse by
Pulse
Current
Limit
Logic
HS
hs
LS
PDRV
VIN
VCW
NDRV
VCL
Zero
Current
Detection
VSW
VIN
0.030 V/A
Current
Sense
VSW
AGND
Figure 2. NCP3170 Block Diagram
PGND
Table 1. PIN FUNCTION DESCRIPTION
Pin Pin Name
Description
1
PGND
The power ground pin is the high current path for the device. The pin should be soldered to a large copper
area to reduce thermal resistance. PGND needs to be electrically connected to AGND.
2 VIN The input voltage pin powers the internal control circuitry and is monitored by multiple voltage comparators.
The VIN pin is also connected to the internal power PMOS switch and linear regulator output. The VIN pin
has high di/dt edges and must be decoupled to ground close to the pin of the device.
3
AGND
The analog ground pin serves as small-signal ground. All small-signal ground paths should connect to the
AGND pin and should also be electrically connected to power ground at a single point, avoiding any high
current ground returns.
4 FB Inverting input to the OTA error amplifier. The FB pin in conjunction with the external compensation serves to
stabilize and achieve the desired output voltage with current mode compensation.
5
COMP
The loop compensation pin is used to compensate the transconductance amplifier which stabilizes the
operation of the converter stage. Place compensation components as close to the converter as possible.
Connect a RC network between COMP and AGND to compensate the control loop.
6 EN Enable pin. Pull EN to logic high to enable the device. Pull EN to logic low to disable the device. Do not leave
it open.
7 PG Power good is an open drain 500 mA pull down indicating output voltage is within the power good window. If
the power good function is not used, it can be connected to the VSW node to reduce thermal resistance. Do
not connect PG to the VSW node if the application is turning on into pre-bias.
8
VSW
The VSW pin is the connection of the drains of the internal N and P MOSFETS. At switch off, the inductor will
drive this pin below ground as the body diode and the NMOS conducts with a high dv/dt.
www.onsemi.com
2


Part Number NCP3170
Description Synchronous PWM Switching Converter
Maker ON Semiconductor
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