PAM2421AECADJR Diodes Incorporated

PAM2421/ PAM2422/ PAM2423 3A, 4.5A, 5.5A PWM STEP-UP DC-DC CONVERTER Description Pin Assignments The PAM242x devices are high-performance, fixed frequency, current-mode PWM step-up DC/DC converters that incorporate internal power MOSFETs. The PAM242x includes an integrated power MOSFET that supports peak currents of up to 3A/4.5A/5.5A. The PAM242x utilizes simple external loop compensation allowing optimization between component size, cost and AC performance across a wide range of applications. Additional functions include an externally programmable soft-start function for easy inrush current control, internal over-voltage protection (OVP), cycle-by-cycle current limit protection, under voltage lock-out and thermal shutdown. The PAM242x is available in the small SO-8EP package. SO-8EP Applications TFT LCD Monitors Features Battery-Powered Equipment Greater than 90% Efficiency Set-Top Boxes Adjustable Output Voltage Up to 24V DSL and Cable Modems and Routers Internal 24V Power MOSFET Peak Current 3A,4.5A,5.5A 520kHz Frequency Built-in Over-Voltage Protection (OVP) Open Protection Programmable Soft-Start Function Thermal Shutdowns Under-Voltage-Lockout Over-Current Protection SO-8EP Package Typical Applications Circuit SS34 L1 VIN VOUT 6.8mH 3.6V ~ 5.5V 12V/800mA C1 C2 C4 C5 10mF 470mF 10mF SW 470 mF PGND R1 85k SS C3 PAM242X VIN C8 1mF EN 10nF FB COMP R2 C6 AGND R3 10k 47pF 51k C7 2.2nF 1 of 10 PAM2421/ PAM2422/ PAM2423 January 2016 Diodes Incorporated www.diodes.com Document number: DS36383 Rev. 2 - 2 NEW PRODUCT PAM2421/ PAM2422/ PAM2423 Pin Descriptions Pin SO-8EP Function Number Pin Name 1 PGND Power Ground 2 VIN Supply Input Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low level to disable the IC. 3 EN When unused, connect EN pin to IN (do not leave pin floating). Error Amplifier Compensation Node 4 COMP Analog Ground 5 AGND Feedback Input.Connect this pin a resistor divider from the output to set the output 6 FB voltage. FB is regulated to 1.262V. Soft Start Control Input. Connect a capacitor from this pin to Ground to set soft-start timing duration. SS is discharged to ground in shutdown. SS may be left unconnected if 7 SS soft start is not desired. Switch Output. Connect this pin to the inductor and the schottky diode. To minimize EMI, minimize the PCB 8 SW trace path between this pin and the input bypass capacitor. Exposed PAD Connected to Ground Functional Block Diagram mA 2 of 10 PAM2421/ PAM2422/ PAM2423 January 2016 Diodes Incorporated www.diodes.com Document number: DS36383 Rev. 2 - 2 NEW PRODUCT