LM2825 Datasheet | National Semiconductor

Description The LM2825 is a plete 1A DC-DC Buck converter packaged in a 24-lead molded Dual-In-Line integrated circuit package. Contained within the package are all the active and passive ponents for a high efficiency step-down (buck) switching regulator. Available in fixed output voltages of 3.3V, 5V and 12V, as well as two adjustable versions, these devices can provide up to 1A of load current with fully guaranteed electrical specifications. Self-contained, this converter is also fully protected from output fault conditions, such as excessive load current, short circuits, or excessive temperatures. Features n n n n n n n n n n n Minimum design time required 3.3V, 5V and 12V fixed output versions Two adjustable versions allow 1.23V to 15V outputs Wide input voltage range, up to 40V Low-power standby mode, IQ typically 65 µA High efficiency, typically 80% ± 4% output voltage tolerance Excellent line and load regulation TTL shutdown capability/programmable Soft-start Thermal shutdown and current limit protection - 40˚C to +85˚C ambient temperature range Highlights n No external ponents required (fixed output voltage versions) n Integrated circuit reliability n MTBF over 20 million hours n Radiated EMI meets Class B stipulated by CISPR 22 n High power density, 35 W/in3 n 24-pin DIP package profile (1.25 x 0.54 x 0.26 inches) Applications n n n n n Simple high-efficiency step-down (buck) regulator On-card switching regulators Efficient pre-regulator for linear regulators Distributed power systems DC/DC module replacement Connection Diagram DS012661-27 Standard Application (Fixed output voltage versions) DS012661-2 “NC (Do not use)” pins: See Figure 11. Top View DS012661-1 Ordering Information Order Number LM2825N-3.3, LM2825N-5.0, LM2825N-12, LM2825N-ADJ or LM2825HN-ADJ See NS Package Number NA24F Radiated EMI Radiated emission of electromagnetic fields is measured at 10m distance. The emission levels are within the Class B limits stipulated by CISPR 22. 30....