EZ1580/EZ1581 EZ1582/EZ1583 Dual Input Low Dropout Regulator POWER MANAGEMENT Description Features The EZ158X family of high performance positive voltage ‹ 540mV dropout @ 7A in dual supply mode regulators are designed for use in applications requiring (EZ1580) very low dropout voltage at up to 7, 5, 3 and 1.5 amps. ‹ Remote sense operation Capable of supplying up to 2.8V on boards where both ‹ Fast transient response 5V and 3.3V supplies are available, the superior dropout ‹ 0.5% initial accuracy characteristics of the EZ158X result in reduced heat ‹ Line regulation typically 0.08% dissipation compared to regular LDOs. This allows for ‹ Load regulation typically 0.08% heatsink size reduction or elimination. Additionally, the ‹ 5 Pin TO-220 and TO-263 packages EZ158X provides excellent regulation over variations in line, load and temperature. Remote sense operation Applications allows compensating for trace, connector and other resistive losses. ‹ Microprocessor supplies ‹ Split plane microprocessor supplies Outstanding features include very low dropout ‹ Advanced graphics cards performance at rated current, fast transient response, ‹ Sound cards remote sense, internal current limiting, thermal shutdown ‹ Low voltage logic supplies and safe operating area protection of the output device. ‹ Switching power supply post regulation The EZ158X is a five terminal adjustable or fixed 2.5V voltage regulator available in the popular 5 pin TO-220 and TO-263 plastic packages. Typical Application Circuits (3) Adjustable Output Parts U1 EZ158XCX 1 SNS VREF 5 3.3V POWER IN PWR 3 2.5V OUT OUT 4 5V CONTROL IN CTL ADJ  R2 R1 V = V 1+ + I • R2 124   OUT REF ADJ C1 C2 C3 R1 2   33uF 10uF 68uF R2 124 GROUND GROUND Fixed Output Parts U1 EZ158XCX-2.5 1 SNS 5 3.3V POWER IN PWR 3 2.5V OUT OUT 4 5V CONTROL IN CTL GND C1 C2 C3 2 33uF 10uF 68uF GROUND GROUND Notes: (1) Capacitor values are for reference only. Good quality, low ESR tantalum or aluminum electrolytic capacitors should be used. Increasing the value of the output capacitor will improve the overall transient response. (2) If the same voltage is input to both PWR and CTL, then the dropout voltage will become 1.3V maximum. (3) A small (~0.033µF) capacitor can be used to bypass the ADJ pin to improve transient response, if needed. June 23, 2010 1 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Absolute Maximum Ratings Pl arameter Sm ymbo Ms aximu Unit PV ower Input Voltage 7V PWR CV ontrol Input Voltage 1V 3.2 CTL PP ower Dissipation IW nternally Limited D Thermal Resistance Junction to Ambient EZ158X TO-220 50 °C/W θ JA EZ158X TO-263 60 Thermal Resistance Junction to Case EZ1580/1 (TO-220 & TO-263) 2 °C/W θ JC EZ1582/3 (TO-220 & TO-263) 3 OT perating Junction Temperature Range 0C to +125 ° J ST torage Temperature Range -C 65 to +150 ° STG LT ead Temperature (Soldering) 10 Sec. 3C 00 ° LEAD ED SD Rating (Human Body Model) E2 S kV (7) Electrical Characteristics Unless specified: V = V , V = 0V, C = C = C = 10µF. Values in bold apply over full operating temperature range. OUT SNS ADJ CTL PWR OUT Pl arameter Ss ymbo Tn estCondition Mp i Tx y Ms a Unit (1) Reference Voltage V V = 2.05V, V = 4.5V, I=7 10mA10 .2313 .251V .26 REF PWR CTL OUT (V Adj. Voltage Versions) = 2.05V, 19 .231 1.26 PWR V=< 4.5V, 10mAI