A Product Line of 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 SOP-8(EP) package. Features Applications Greater than 90% Efficiency Adjustable Output Voltage Up to 24V TFT LCD Monitors Internal 24V Power MOSFET Battery-Powered Equipment Peak Current 3A,4.5A,5.5A Set-Top Boxes 520kHz Frequency DSL and Cable Modems and Routers Built-in Over-Voltage Protection (OVP) Open Protection Programmable Soft-Start Function Thermal Shutdowns Under-Voltage-Lockout Over-Current Protection SOP-8(EP) Package Typical Applications Circuit 1 of 10 November 2012 PAM2421/PAM2422/PAM2423 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 1 A Product Line of Diodes Incorporated PAM2421/ PAM2422/ PAM2423 Pin Descriptions Pin SOP-8(EP) Function Number Pin Name 1 PGND Power Ground 2 IN Supply Input Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low 3 EN level to disable the IC. When unused, connect EN pin to IN (do not leave pin floating). 4 COMP Error Amplifier Compensation Node 5 AGND Analog Ground 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 7 SS timing duration. SS is discharged to ground in shutdown. SS may be left unconnected if soft start is not desired. Switch Output. Connect this pin to the inductor and the schottky diode. To minimize 8 SW EMI, minimize the PCB trace path between this pin and the input bypass capacitor. Connected to Ground Exposed PAD Functional Block Diagram 2 of 10 November 2012 PAM2421/PAM2422/PAM2423 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 1