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NCP1581

ON Semiconductor
Part Number NCP1581
Manufacturer ON Semiconductor
Description High Frequency Synchronous Step-Down PWM Controller
Published Aug 26, 2010
Detailed Description NCP1581 High Frequency Synchronous Step Down PWM Controller for Tracking Applications The NCP1581 controller IC is desi...
Datasheet PDF File NCP1581 PDF File

NCP1581
NCP1581

Overview
NCP1581 High Frequency Synchronous Step Down PWM Controller for Tracking Applications The NCP1581 controller IC is designed to provide a simple synchronous buck regulator for on−board DC to DC applications in a 14−pin SOIC.
The NCP1581 is designed specifically for tracking applications by providing the track input.
The NCP1581 operates at a fixed internal 400 kHz switching frequency allowing the use of small external components.
The device features a programmable soft start set by an external capacitor, under−voltage lockout and output under−voltage detection that latches off the device when an output short is detected.
Features • Power up Sequencing / Tracking • Enable Input • Internal 400 kHz Oscillator • Programmable Soft−Start • Fixed Frequency Voltage Mode • Voltage Mode Adaptive Deadtime • This is a Pb−Free Device Applications • Tracking Applications • Game Consoles • Computing Peripheral Voltage Regulators • Graphics Cards • General DC to DC Converters http://onsemi.
com MARKING SOIC−14 DIAGRAM 14 D SUFFIX 1 CASE 751A NCP1581G A = Assembly Location AWLYWW WL = Wafer Lot Y = Year 1 WW = Work Week G = Pb−Free Package PIN CONNECTIONS 1 FB NC VP SS NC COMP VCC NC NC VC LDRV HDRV GND PGND (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 13 of this data sheet.
NCP1581 Figure 1.
Typical Application Circuit © Semiconductor Components Industries, LLC, 2010 1 January, 2010 − Rev.
0 Publication Order Number: NCP1581/D Figure 2.
Simplified Block Diagram http://onsemi.
com 2 VCC GND SS V CC UVLO VP/EN 0.
65V V BIAS 2 2 uA POR Oscillator 64uA Max CT POR S Q R Reset Dom PWM FAULT VP/EN FB COMP POR 25k 25k Error Amp Error Comparator 0.
4V POR R S POR Q 2V SS FAULT Delay 2V 2V Delay VC HDRV VCC LDRV PGND Circuit Description: Block Diagram NCP1581 NCP1581 Table 1.
PIN FUNCTION DESCRIPTION Pin Name Description 1 FB Inverting input to ...


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