Buck Converter - DC-DC, High Efficiency, Adjustable Output Voltage, Low Ripple 1.7 MHz, 1 A NCP1529 The NCP1529 step down DC DC converter is a monolithic www.onsemi.com integrated circuit for portable applications powered from one cell Liion or three cell Alkaline/NiCd/NiMH batteries. The device is able MARKING to deliver up to 1.0 A on an output voltage range externally adjustable DIAGRAM from 0.9 V to 3.9 V or fixed at 1.2 V or 1.35 V. It uses synchronous 5 rectification to increase efficiency and reduce external part count. The device also has a builtin 1.7 MHz (nominal) oscillator which reduces TSOP5 DXJAYW SN SUFFIX component size by allowing a small inductor and capacitors. Automatic 5 CASE 483 1 switching PWM/PFM mode offers improved system efficiency. 1 Additional features include integrated softstart, cyclebycycle DXJ = Specific Device Code current limiting and thermal shutdown protection. A = Assembly Location The NCP1529 is available in a space saving, low profile Y = Year 2x2x0.5 mm UDFN6 package and TSOP5 package. W = Work Week = PbFree Package Features (Note: Microdot may be in either location) Up to 96% Efficiency Best In Class Ripple, including PFM mode UDFN6 1 6 Source up 1.0 A XXM MU SUFFIX 2 5 3 4 CASE 517AB 1.7 MHz Switching Frequency Adjustable from 0.9 V to 3.9 V or Fixed at 1.2 V or 1.35 V XX = Specific Device Code Synchronous rectification for higher efficiency M = Date Code = PbFree Package 2.7 V to 5.5 V Input Voltage Range (Note: Microdot may be in either location) Low Quiescent Current 28 A Shutdown Current Consumption of 0.3 A Thermal Limit Protection ORDERING INFORMATION Short Circuit Protection See detailed ordering and shipping information in the package dimensions section on page 14 of this data sheet. All Pins are Fully ESD Protected These are PbFree Devices Typical Applications Cellular Phones, Smart Phones and PDAs Digital Still Cameras MP3 Players and Portable Audio Systems Wireless and DSL Modems USB Powered Devices Portable Equipment L L V V V OUT V VIN SW VIN SW OUT IN IN C C IN IN C C OUT OUT R1 C ff OFF ON OFF ON EN FB EN FB GND GND R2 Figure 1. Typical Application for Adjustable Version Figure 2. Typical Application for Fixed Version Semiconductor Components Industries, LLC, 2010 1 Publication Order Number: August, 2020 Rev. 6 NCP1529/DNCP1529 PIN FUNCTION DESCRIPTION Pin Pin TSOP5 UDFN6 Pin Name Type Description 1 6 EN Analog Input Enable for switching regulators. This pin is active HIGH and is turned off by logic LOW on this pin. 2 2,4,7 GND Analog / This pin is the GND reference for the NFET power stage and the analog (Note 1) Power Ground section of the IC. The pin must be connected to the system ground. 3 5 SW Analog Output Connection from power MOSFETs to the Inductor. 4 3 VIN Analog / Power supply input for the PFET power stage, analog and digital blocks. The Power Input pin must be decoupled to ground by a 4.7 F ceramic capacitor. 5 1 FB Analog Input Feedback voltage from the output of the power supply. This is the input to the error amplifier. 1. Exposed pad for UDFN6 package, named Pin 7, must be connected to system ground. PIN CONNECTIONS FB EN EN 1 5 FB 1 6 7 GND 2 GND 2 5 SW SW 3 4 VIN VIN 3 4 GND (Top View) (Top View) Figure 3. Pin Connections TSOP5 Figure 4. Pin Connections UDFN6 PERFORMANCES 100 90 80 70 60 50 40 30 20 10 0 0 500 1000 I (mA) OUT Figure 5. Efficiency vs Output Current V = 3.6 V, V = 3.3 V IN OUT www.onsemi.com 2 EFFICIENCY (%)