NCP3231 PDF даташит
Спецификация NCP3231 изготовлена «ON Semiconductor» и имеет функцию, называемую «High Current Synchronous Buck Converter». |
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Детали детали
Номер произв | NCP3231 |
Описание | High Current Synchronous Buck Converter |
Производители | ON Semiconductor |
логотип |
15 Pages
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NCP3231
High Current Synchronous
Buck Converter
The NCP3231 is a high current, high efficiency, voltage−feed−
forward voltage−mode synchronous buck converter which operates
from 4.5 V to 18 V input and generates output voltages down to 0.6 V
at up to 25 A DC load or 30 A instantaneous load.
Features
• Wide Input Voltage Range from 4.5 V to 18 V
• 0.6 V Internal Reference Voltage
• 500 kHz Switching Frequency
• External Programmable Soft−start
• Lossless Low−side FET Current Sensing
• Output Over−voltage Protection and Under−voltage Protection
• System Over−temperature Protection using a Thermistor or Sensor
• Hiccup Mode Operation for All Faults
• Pre−bias Start−up
• Adjustable Output Voltage
• Power Good Output
• Internal Over−temperature Protection
• This is a Pb−Free Device*
Typical Applications
• Cellular Base Stations
• ASIC, FPGA, DSP and CPU Core and I/O Supplies
• Telecom and Network Equipment
• Server and Storage System
www.onsemi.com
1 40
QFN40 6x6, 0.5P
CASE 485CM
MARKING
DIAGRAM
1
NCP3231
AWLYYWWG
NCP3231
A
WL
YY
WW
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
VIN 11
VIN 12
VIN 13
VIN 14
VSWH 15
PGND 16
PGND 17
PGND 18
PGND 19
PGND 20
VIN
EP42
GND
EP41
VSWH
EP43
40 EN
39 VCC
38 VB
37 PGND
36 BST
35 VSW
34 VSWH
33 VSWH
32 VSWH
31 VSWH
(TOP VIEW)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
ORDERING INFORMATION
Device
Package
NCP3231MNTXG QFN−40
(Pb−Free)
Shipping†
2500 /
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.
© Semiconductor Components Industries, LLC, 2015
May, 2015 − Rev. 5
1
Publication Order Number:
NCP3231/D
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NCP3231
VCC
VB
LDO
COMP
FB
VREF
VDD
+
E/A
−
VB
OSC
SS Soft Start
VCC
2 mA
EN
1.2 V
PG
VB
Enable
Logic
POR
VCC
VB
Control Logic
Ramp Generator
PWM Logic
− and −
UVLO
OVP, UVP
Power Good
OCP, TSD
Protection
AGND
Figure 1. NCP3231 Block Diagram
VB
PVDD
VB
+ VREF
−
BST
VIN
VSWH
VSW
PGND
OTS
ISET
www.onsemi.com
2
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NCP3231
PIN DESCRIPTION
Pin No. Symbol
1 SS
2 FB
3 COMP
4 ISET
5 AGND
6 OTS
7 PG
8−14,
EP42
VIN
15, 29−34,
EP43
VSWH
16−28, 37 PGND
35 VSW
36 BST
38 VB
39 VCC
40 EN
EP41
GND
Description
A capacitor from this pin to GND allows the user to adjust the soft−start ramp time.
Output voltage feedback.
Output of the error amplifier.
A resistor from this pin to ground sets the over−current protection (OCP) threshold.
Analog ground.
Negative input of internal thermal comparator. Tie this pin to ground if not in use.
Power good indicator of the output voltage. Open−drain output. Connect PG to VDD with an external resistor.
The VIN pin is connected to the internal power NMOS switch. The VIN pin has high di/dt edges and must be
decoupled to ground close to the pin of the device.
The VSWH pin is the connection of the drain and source of the internal NMOS switches. At switch off, the
inductor will drive this pin below ground as the body diode and the NMOS conducts with a high dv/dt.
Ground reference and high−current return path for the bottom gate driver and low- side NMOS.
IC connection to the switch node between the top MOSFET and bottom MOSFET. Return path of the high−
side gate driver.
Top gate driver input supply, a bootstrap capacitor connection between the switch node and this pin.
The internal LDO output and input supply for the NCP3231. Connect a minimum of 4.7 mF ceramic capacitor
from this pin to ground.
Input Supply for IC. This pin must be connected to VIN. Decouple the VCC pin close to ground near the pin
of the device.
Logic control for enabling the switcher. An internal pull−up enables the device automatically. The EN pin can
also be driven high to turn on the device, or low to turn off the device. A comparator and precision reference
allow the user to implement this pin as an adjustable UVLO circuit.
Exposed Pad. Connect GND to a large copper plane at ground potential to improve thermal dissipation.
www.onsemi.com
3
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Номер в каталоге | Описание | Производители |
NCP3230 | High Current Synchronous Buck Converter | ON Semiconductor |
NCP3231 | High Current Synchronous Buck Converter | ON Semiconductor |
NCP3231A | High Current Synchronous Buck Converter | ON Semiconductor |
NCP3232N | High Current Synchronous Buck Converter | ON Semiconductor |
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