NCP1523BGEVB NCP1523B Adjustable Output Voltage Step Down Converter Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Overview and capacitors. Available in PWM mode only (NCP1523BFCT2G), it offers a very efficient load transient solution. Finally, it includes an integrated soft-start, cycle-by-cycle current limiting, and thermal shutdown protection. The NCP1523B is available in a space saving, 8 pin chip scale package. The NCP1523B step-down PWM DC-DC converter is optimized for portable applications powered from one cell Li-ion or three cell Alkaline/NiCd/NiMH batteries. The device is available in an adjustable output voltage from 0.9 V to 3.3 V. It uses synchronous rectification to increase efficiency and reduce external part count. The device also has a built-in 1.5 MHz (nominal) oscillator which reduces component size by allowing a small inductor Figure 1. NCP1523B Evaluation Board Semiconductor Components Industries, LLC, 2013 July, 2013 − Rev. 2 1 Publication Order Number: EVBUM2202/D NCP1523BGEVB Table 1. ABSOLUTE MAXIMUM RATINGS (TA = 25C) Rating Symbol Value Unit Maximum Voltage All Pins Vmin −0.3 V Maximum Voltage All Pins (Note 1) Vmax 7 V Maximum Voltage Enable, FB, LX Vmax VIN + 0.3 V Thermal Resistance Junction to Air RqJA 159 C/W Ta −40 to 85 C Operating Ambient Temperature Range Storage Temperature Range Tstg −55 to 150 C Junction Operating Temperature Tj −40 to 125 C Latch-up Current Maximum Rating TA = 85C (Note 3) Lu 100 mA 2.0 200 kV V ESD Withstand Voltage (Note 2) Human Body Model Machine Model VESD Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. According JEDEC standard JESD22−A108B 2. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) 2.0 kV per JEDEC standard: JESD22−A114 Machine Model (MM) 200 V per JEDEC standard: JESD22−A115 3. Latch-up current maximum rating per JEDEC standard: JESD78. Electrical Characteristics For Electrical Characteristic, please see our NCP1523/D data sheet available on our website. Table 2. INPUT POWER Symbol Switch Descriptions VIN+ This is the Positive Connection for the Power Supply VIN− This is the Return Connection for the Power Supply GND1, GND2 Ground Clip Table 3. SETUP Symbol Switch Descriptions ENABLE To Enable the Buck Converter, Connect a Shorting Jumper between ENABLE−1 and ENABLE−2 To Disable the Buck Converter, Connect a Shorting Jumper between ENABLE−3 and ENABLE−2 SELECT A Shorting Jumper Must be Used to Select an Output Voltage of 1.2 V, 1.5 V or 1.8 V Table 4. OUTPUT POWER Symbol Switch Descriptions VOUT+ This is the Positive Connection of the Output Voltage VOUT− This is the Return Connection of the Output Voltage Table 5. TEST POINT Symbol Switch Descriptions TPVIN This is the Test Point of the Input Voltage TPEN This is the Test Point of the Enable Pin TPLX This is the Test Point of the Inductor Voltage TPVOUT This is the Test Point of the Output Voltage http://onsemi.com 2 NCP1523BGEVB Figure 2. NCP1523B Evaluation Board Schematic http://onsemi.com 3 NCP1523BGEVB PCB LAYOUT Figure 3. NCP1523B Assembly Layer Figure 4. NCP1523B Layout http://onsemi.com 4 NCP1523BGEVB Figure 5. NCP1523B Top Layer Routing Figure 6. NCP1523B Bottom Layer Routing http://onsemi.com 5 NCP1523BGEVB NCP1523B TEST PROCEDURE Equipment Needed Test 1. Jumper ENABLE should be open. 2. Set the power supply to 3.6 V and the current limit of at least 800 mA. 3. Connect the power supply connector to connectors VIN+ and VIN−. The DC current measurement on Vin line should be around 0.3 mA. 4. Close ENABLE connector. The DC current measurement on Vin line should be around 3 mA. 5. Measure the output voltage between VOUT+ and VOUT− connectors. You should see around 1.2 V voltage operation. 6. Remove the ENABLE jumper. The DC current measurement on Vin line should be back around 0.3 mA. Power Supply Digital Volt Meter Digital Amp Meter Table 6. NCP1523B BILL OF MATERIALS Designator Qty. Description Value Tolerance Footprint Manufacturer Manufacturer Part Number Lead Free U1 1 IC, Converter, DC/DC NA NA 8-pin Flip Chip ON Semiconductor NCP1523B Yes C1, C2 2 Ceramic Capacitor 4.7 mF, 6.3 V, X5R 10% 0603 Murata GRM188R60J475KE19D Yes R1, R2 2 SMD Resistor 510 kW 1% 0603 std std Yes R3 1 SMD Resistor 330 kW 1% 0603 std std Yes R4 1 SMD Resistor 240 kW 1% 0603 std std Yes L1 1 Inductor 2.2 mH 30% 1210 Coilcraft LPS3008-222NL Yes VIN, VOUT 4 Connector NA NA NA Kontek Comatel Cambion 3110014000500 160-1724-02-05-00 Yes ENABLE 1 3 Pin Jumper Header NA NA 2.54 mm TYCO/AMP Molex/Waldom 5-826629-0 90120-0160 Yes SELECT 1 3 2 Pin Jumper Header NA NA 2.54 mm TYCO/AMP Molex/Waldom 4731955180470 90131-0140 GND1, GND2 2 Jumper for GND NA NA 10.16 mm Harwin Molex/Waldom D3082-01 90120-0160 Yes TPEN, TPLX, TPVIN, TPVOUT 4 Test Point Type 3 NA NA 1.60 mm Keystone 5010 Yes PCB 1 50.8 50.8 1.0 (mm) 4 Layers NA NA NA Any TLS-P-002-A-1006-BR Yes ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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