NCP1597B 반도체 회로 부품 판매점
2 A Synchronous Buck Regulator
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 ON Semiconductor |
NCP1597B
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1 MHz, 2 A Synchronous
Buck Regulator
The NCP1597B is a fixed 1 MHz, high−output−current,
synchronous PWM converter that integrates a low−resistance,
high−side P−channel MOSFET and a low−side N−channel MOSFET.
The NCP1597B utilizes current mode control to provide fast transient
response and excellent loop stability. It regulates input voltages from
4.0 V to 5.5 V down to an output voltage as low as 0.8 V and is able to
supply up to 2 A.
The NCP1597B has features including fixed internal switching
frequency (FSW), and an internal soft−start to limit inrush current.
Using the EN pin, shutdown supply current is reduced to 3 mA
maximum.
Other features include cycle−by−cycle current limiting;
short−circuit protection, low dropout mode, power saving mode and
thermal shutdown.
Features
• Input Voltage Range: from 4.0 V to 5.5 V
• Internal 140 mW High−Side Switching P−Channel MOSFET and
90 mW Low−Side N−Channel MOSFET
• Fixed 1 MHz Switching Frequency
• Cycle−by−Cycle Current Limiting
• Overtemperature Protection
• Internal Soft−Start
• Start−up with Pre−Biased Output Load
• Adjustable Output Voltage Down to 0.8 V
• Power Saving Mode During Light Load
• Low Dropout Mode Operation to Extend the Battery Life
• These are Pb−Free Devices
Applications
• DSP Power
• Hard Disk Drivers
• Computer Peripherals
• Home Audio
• Set−Top Boxes
• Networking Equipment
• LCD TV
• Wireless and DSL/Cable Modem
• USB Power Devices
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DFN10
CASE 485C
MARKING
DIAGRAM
1597B
ALYWG
G
1597B = 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
EN
VCC
VCCP
AGND
FB
1
2
3
4
5
10 PGND
9 PGND
8 LX
7 LX
6 NC
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1597BMNTWG DFN10 3000 / Tape &
(Pb−Free)
Reel
NCP1597BMNTXG DFN10 3000 / Tape &
(Pb−Free)
Reel
†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.
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2009
October, 2009 − Rev. P0
1
Publication Order Number:
NCP1597B/D
VCC
NCP1597B
EN
Power Reset
UVLO
THD
Hiccup
Soft−Start
Vref
FB
+
+ gm
−
AGND
NCP1597B
BLOCK DIAGRAM
+
CA
−
+ OSC
PMOS
M1
−PWM
+
Control
Logic
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VCCP
LX
LX
PGND
PIN DESCRIPTIONS
Pin No
Symbol
1 EN
2 VCC
3 VCCP
4 AGND
5 FB
6
7, 8
9, 10
EP
NC
LX
PGND
PAD
Figure 1. Block Diagram
Description
Logic input to enable the part. Logic high turns on the part and a logic low disables it. An internal pullup
forces the part into an enable state when no external bias is present on the pin.
Input supply pin for internal bias circuitry. A 0.1 mF ceramic bypass capacitor is preferred to connect to
this pin.
Power input for the power stage
Analog ground pin. Connect to thermal pad.
Feedback input pin of the Error Amplifier. Connect a resistor divider from the converter’s output voltage
to this pin to set the converter’s output voltage.
No connection
The drains of the internal MOSFETs. The output inductor should be connected to these pins.
Power ground pins. Connect to thermal pad.
Exposed pad of the package provides both electrical contact to the ground and good thermal contact to
the PCB. This pad must be soldered to the PCB for proper operation.
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NCP1597B regulator
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전화번호 : 051-319-2877
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IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
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관련 데이터시트
NCP1597A
2.0 A Synchronous Buck Regulator - ON Semiconductor
NCP1597B
2 A Synchronous Buck Regulator - ON Semiconductor