PAM2320 EVB User Guide PAM2320 PSOP8 EV Board User Guide AE Department 1. Revision Information Date 2010/05 2011/06 Revision V1.1 V2.0 Description Initial Release Optimize EVB Comment PAM2310 EB09AA PAM2320 EB16AA 2. PAM2320 General Description The PAM2320 is a 3A step-down DC-DC converter. At heavy load, the constant-frequency PWM control performs excellent stability and transient response. No external compensation components are required. The PAM2320 supports a range of input voltages from 2.7V to 5.5V, allowing the use of adapter or DC-DC output 5V etc standard power source. The output voltage is adjustable from 0.6V to the input voltage. The PAM2320 employs internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1μA. Other key features include over-temperature and short circuit protection. The PAM2320 delivers 3A maximum output current while consuming only 42μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the PAM2320 an ideal choice for high output voltage, high current applications which require a low dropout threshold. The PAM2320 is available in PSOP8 package. This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM2320 EVB User Guide 3. Key Features z z z z z z z Output Current: Up to 3A Output Voltage: 0.6V to VIN Input Voltage: 2.7V to 5.5V Efficiency up to 95% 42μA (Typ) No Load Quiescent Current Shutdown Current: <1µA 100% Duty Cycle LDO Operation z z z z z z 1.5MHz Switching Frequency Internal Soft Start No external Compensation Required Current Limit Protection Thermal Shutdown PSOP8 Package 4. EV Board Schematic C1 C6 C7 IC1 C11 1 VIN R1 FB VOUT L1 SW 2 3 4 NC NC VIN EN SW NC GND FB 8 VIN EN 7 3 2 1 6 5 FB R2 C2 C8 C9 C10 5. EVB PAM2320 EB16AA Description PAM2320 EB16AA is an evaluation board for the PAM2320 PSOP8, a DC/DC converter. The board is targeted to be used in providing a simple and convenient evaluation environment for the PAM2320. Requires parts, power supply connectors etc. on the board, which makes it easy to be evaluated. This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM2320 EVB User Guide 6. EV Board View Top View 7. Resistor Select for Output Voltage Setting VOUT = (1+R1/R2)×VREF Vo 1.2V 1.5V 1.8V 2.5V 3.3V (VREF = 0.6V) R1 150k 225k 300k 475k 680k R2 150k 150k 150k 150k 150k L 2.2µH 2.2µH 2.2µH 2.2µH 3.3µH This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM2320 EVB User Guide 8. External Compnents Selection Input & output Capacitors (C1,C6,C7; C2,C8,C9,C10) (1) For lower output ripple, low ESR is required. (2) Low leakage current needed, X5R/X7R ceramic recommend, multiple capacitor parallel connection. Feed forward capacitor (C11) (1) Lower the output ripple. (2) Low leakage current needed, 100pF, COH/CH ceramic recommend. Output Voltage programmer resistors (R1, R2) (1) For programmer output voltage. (2) For accurate output voltage, 1% tolerance is required. Inductor (L1) (1) Low DCR for good efficiency. (2) Inductance saturate current must higher than the output current. 9. Evaluation Board BOM List Item Value C1, C6, C7 10µF C2, C8, C9, C10 10µF C11 100pF L1 3.3µH R1 R2 IC1 PCB 680K 150K Type X5R/X7R, Ceramic/1206 X5R/X7R, Ceramic/0805 COH/CH, Ceramic/0402 Rating 25V 10V 50V >4A 0603 1% 0603 1% PAM2320 PSOP-8 PAM2320 EB16AA Description Vender and Part No. HR-TECH Input coupling CAP, TMK316 BJ106KL-T AIYO YUDEN Output CAP EMK212ABJ106KD-T TAIYO YUDEN Feed forward CAP UMK105CH101JV-F WURTH 744777003 Inductor TAIYO YUDEN NRS8030T3R0NMGJ Voltage set RES This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM2320 EVB User Guide 10. PCB Layout Example Top Layer This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product. PAM2320 EVB User Guide Bottom Layer This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.