NCP1521BEVB NCP1521B Adjustable Output Voltage Step-Down Converter Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Overview which reduces component size by allowing smaller inductors and capacitors. Automatic switching PWM/PFM mode offers improved system efficiency. Additional features include integrated soft−start, cycle−by−cycle current limiting and thermal shutdown protection. The NCP1521B is available in space saving, low profile TSOP5 and UDFN6 packages. The NCP1521B 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 part is available in adjustable output voltage versions ranging 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 Figure 1. Board Picture in TSOP−5 © Semiconductor Components Industries, LLC, 2012 April, 2012 − Rev. 1 Figure 2. Board Picture in mDFN−6 1 Publication Order Number: EVBUM2104/D NCP1521BEVB MAXIMUM RATINGS Maximum ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum−rated conditions is not implied. Functional operation should be restricted to the Recommend Operating Conditions (Note 1). Rating Symbol Value Unit Vmin −0.3 V Vmax 7.0 V Vmax VIN + 0.3 V Rqja 300 260 °C/W Operating Ambient Temperature Range TA −40 to 85 °C Storage Temperature Range Tstg −55 to 150 °C Junction Operating Temperature TJ −40 to 125 °C Latch−up current maximum rating Ta=85°C (Note 4) other pins Lu $100 mA 2.0 200 kV V 1 per IPC Minimum Voltage All Pins Maximum Voltage All Pins (Note 2) Maximum Voltage EN1, EN2, FB, LX Thermal Resistance Junction−to−Air ESD Withstand Voltage (Note 3) TSOP−5 UDFN−6 Human Body Model Machine Model Moisture Sensitivity Level (Note 5) Vesd MSL 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. Maximum electrical ratings are defined as those values beyond which damage to the device may occur at TA = 25°C 2. According JEDEC standard JESD22−A108B 3. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) per JEDEC standard: JESD22−A114 Machine Model (MM) per JEDEC standard: JESD22−A115 4. Latchup current maximum rating per JEDEC standard: JESD78. 5. JEDEC Standard: J−STD−020A. ELECTRICAL CHARACTERISTICS For Electrical Characteristic, please see our NCP1521B datasheet available at http://www.onsemi.com/PowerSolutions/product.do?id=NCP1521B NCP1521B – BOARD CONNECTIONS Symbol Switch Descriptions INPUT POWER VIN+ This is the positive connection for power supply. VIN− This is the return connection for the power supply GND1, GND2 Ground clip SETUP 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 OUTPUT POWER VOUT+ This is the positive connection of the output voltage. VOUT− This is the return connection of the output voltage. TEST POINT 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 NCP1521BEVB NCP1521B – BOARD SCHEMATIC TPLX TP3 TPVIN TP1 L1 2.2mH U1 CON2 1 2 VIN VIN C1 4.7mF VIN 1 VIN 2 EN LX 5 TPVOUT TP4 SW VOUT VOUT 1 2 GND 3 EN FB R1 510k 4 C3 18pF CON2 NCP1521 VIN C2 R4 4.7mF 250k 1.5V 1.2V TPEN TP2 ENABLE CON3x1 GND2 JMP2 R3 330k 1 3 5 GND1 JMP1 1 1 2 3 SELECT CON3x2 H1 FIX H2 FIX H3 FIX H4 FIX 1 1 1 2 2 2 4 6 EN 1 1 R2 510k Figure 3. Board Schematic in TSOP−5 FB 2 VIN VIN 1 3 FB GND LX VIN GND NCP1521 C1 4.7mF 6 5 SW L1 2.2mH VOUT VOUT R1 510k 4 R2 510k GND2 JMP2 CON2 TPEN TP2 C2 R4 4.7mF 250k SELECT CON3x2 VIN EN H1 FIX H2 FIX H3 FIX H4 FIX Figure 4. Board Schematic in mDFN−6 http://onsemi.com 3 1 1 1 2 2 1 2 3 C3 18pF 1 3 5 ENABLE CON3x1 R3 330k 2 4 6 1 1 GND1 JMP1 1 2 FB 1.2V VIN EN 1 CON2 1 2 EN U1 1.5V TPVIN TP1 TPVOUT TP4 TPLX TP3 NCP1521BEVB NCP1521B – TEST PROCEDURE Equipment needed • • • • 4. Connect the power supply connector to connectors VIN+ and VIN−. The DC current measurement on VIN line should be around 0.3 mA. 5. Close ENABLE connector. The DC current measurement on VIN line should be around 40 mA. 6. Measure the output voltage between VOUT+ and VOUT− connectors. You should see around 1.2 V voltage operation. 7. Remove the ENABLE jumper. The DC current measurement on VIN line should be back around 0.3 mA. 10 pt. Times (list:bull2) Power supply Digital Volt Meter Digital Amp Meter Test 1. Jumper ENABLE should be open. 2. Jumper SELECT should be closed to 1.2 V. 3. Set the power supply to 3.6 V and the current limit of at least 800 mA. NCP1521B – BILL OF MATERIAL Designator Qty Description Value Tolerance Footprint U1 1 IC, Converter, DC/DC NA NA TSOP5 UDFN ON Semiconductor NCP1521B NCP1521BU C1 1 Ceramic capacitor 4.7 mF, 10 V, X5R 10% 0805 TDK C1608X5R1A475 C2 1 Ceramic capacitor 10 mF, 6,3 V, X5R 10% 0603 TDK C1608X5R0J105 C3 1 Ceramic capacitor 18 pF, 50 V, COG 5% 0603 TDK C1608C0G1H180 R1, R2 2 SMD resistor 510k 1% 0603 std std R3 1 SMD resistor 330k 1% 0603 std std R4 1 SMD resistor 240k 1% 0603 std std L1 1 Inductor 2.2 mH 30% 1210 Coilcraft LPS3008−222NL VIN, VOUT 4 Connector NA NA NA Kontek Comatel Cambion 3110014000500 160−1724−02−05−00 ENABLE 1 3 Pin Jumper Header NA NA 2.54mm TYCO/AMP Molex / Waldom 5−826629−0 90120−0160 SELECT 1 3x2 Pin Jumper Header NA NA 2.54mm TYCO/AMP Molex / Waldom 4731955180470 90131−0140 GND1, GND2 2 Jumper for GND NA NA 10.16mm Harwin Molex / Waldom D3082−01 90120−0160 TPEN, TPLX, TPVIN, TPVOUT 4 Test point type 3 NA NA f1.60mm Keystone 5010 PCB 1 50.8mm x 50.8mm x 1.0 mm 4 Layers NA NA NA Any TLS−P−004−A−1106−BR TLS−P−003−A−0207−BR http://onsemi.com 4 Manufacturer Manufacturer Part Number NCP1521BEVB NCP1521B – PCB LAYOUT Board Reference: TLS−P−004−A−1106−BR Board Reference: TLS−P−003−A−0207−BR Figure 5. Assembly Layer in TSOP−5 Figure 6. Assembly Layer in mDFN−6 Figure 7. Part Layout in TSOP−5 Figure 8. Part Layout in mDFN−6 http://onsemi.com 5 NCP1521BEVB Figure 9. Top Layer Routing in TSOP−5 Figure 10. Top Layer Routing in mDFN−6 Figure 11. Ground Layer Routing in TSOP−5 Figure 12. Ground Layer Routing in mDFN−6 http://onsemi.com 6 NCP1521BEVB Figure 13. Power Layer Routing in TSOP−5 Figure 14. Power Layer Routing in mDFN−6 Figure 15. Bottom Layer Routing in TSOP−5 Figure 16. Bottom Layer Routing in mDFN−6 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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