EZ1580/EZ1581 EZ1582/EZ1583 Dual Input Low Dropout Regulator POWER MANAGEMENT Description Features The EZ158X family of high performance positive voltage regulators are designed for use in applications requiring very low dropout voltage at up to 7, 5, 3 and 1.5 amps. Capable of supplying up to 2.8V on boards where both 5V and 3.3V supplies are available, the superior dropout characteristics of the EZ158X result in reduced heat dissipation compared to regular LDOs. This allows for heatsink size reduction or elimination. Additionally, the EZ158X provides excellent regulation over variations in line, load and temperature. Remote sense operation allows compensating for trace, connector and other resistive losses. u 540mV dropout @ 7A in dual supply mode u u u u u u (EZ1580) Remote sense operation Fast transient response 0.5% initial accuracy Line regulation typically 0.08% Load regulation typically 0.08% 5 Pin TO-220 and TO-263 packages Applications u u u u u u Outstanding features include very low dropout performance at rated current, fast transient response, remote sense, internal current limiting, thermal shutdown and safe operating area protection of the output device. The EZ158X is a five terminal adjustable voltage regulator available in the popular 5 pin TO-220 and TO-263 plastic packages. Microprocessor supplies Split plane microprocessor supplies Advanced graphics cards Sound cards Low voltage logic supplies Switching power supply post regulation Typical Application Circuits Adjustable Output Parts(3) U1 3.3V POWER IN 5 5V CONTROL IN 4 1 SNS EZ158XCX VREF PWR OUT 3 ADJ C1 33uF 2.5V OUT R2 VOUT = VREF 1 + + I ADJ • R 2 R1 CTL C2 10uF R1 124 C3 68uF 2 R2 124 GROUND GROUND Fixed Output Parts U1 EZ158XCX-2.5 U1 SNS 5 3.3V POWER IN PWR OUT 4 5V CONTROL IN 3 2.5V POWER IN 5 3.3V CONTROL IN 4 2.5V OUT PWR OUT CTL GROUND C2 10uF 2 3 1.5V OUT CTL GND C1 33uF EZ158XCX-1.5 1 SNS 1 GND C3 68uF C1 47uF GROUND GROUND C2 10uF 2 C3 100uF 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. Revision 1, January 2001 1 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Absolute Maximum Ratings Parameter Sy mbol Maximum U nits Power Input Voltage VPWR 7 V C ontrol Input Voltage VCTL 13.2 V Power D i ssi pati on PD Internally Li mi ted W Thermal Resi stance Juncti on to Ambi ent EZ158X TO-220 EZ158X TO-263 q JA 50 60 °C /W Thermal Resi stance Juncti on to C ase EZ1580/1 (TO-220 & TO-263) EZ1582/3 (TO-220 & TO-263) q JC 2 3 °C /W Operati ng Juncti on Temperature Range TJ 0 to +125 °C Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Solderi ng) 10 Sec. TLEAD 300 °C ESD Rati ng (Human Body Model) ESD 2 kV Electrical Characteristics(7) Unless specified: VOUT = VSNS, VADJ = 0V, CCTL = CPWR = COUT = 10µF. Values in bold apply over full operating temperature range. Parameter Reference Voltage(1) Sy mbol Test C onditions Min Ty p Max U nits VREF VPWR = 2.05V, VCTL = 4.5V, IOUT = 10mA 1.237 1.250 1.263 V VPWR = 2.05V, VCTL = 4.5V, 10mA < IOUT < IRATED 1.231 VPWR = VOUT + 0.8V, VCTL = 4.5V, IOUT = 10mA -1 VPWR = VOUT + 0.8V, VCTL = 4.5V, 10mA < IOUT < IRATED -1.5 (Adj. Voltage Versi ons) Output Voltage(1) VOUT (Fi xed Voltage Versi ons) 1.269 VOUT +1 % +1.5 Li ne Regulati on(1) REG(LINE) VPWR = (VOUT + 0.8V) to 5.5V, VCTL = 4.5V to 12V, IOUT = 10mA 1.0 3.0 mV Load Regulati on(1) REG(LOAD) VPWR = VOUT + 0.8V, VCTL = 4.5V, IOUT = 10mA to IRATED 1.0 5.0 mV VPWR - VOUT VCTL = 4.75V, I O = IRATED 0.40 0.50 V 0.50 0.60 0.54 0.62 0.70 0.80 VPWR D ropout Voltage (1)(2) EZ1581, EZ1582, EZ1583 VPWR D ropout Voltage EZ1580 ã 2001 Semtech Corp. (1)(2) VCTL = 4.75V, I O = IRATED 2 V www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Electrical Characteristics (Cont.)(7) Unless specified: VOUT = VSNS, VADJ = 0V, CCTL = CPWR = COUT = 10µF. Values in bold apply over full operating temperature range. Parameter Sy mbol Test C onditions ICTL VPWR = VOUT + 0.8V, VCTL = 4.5V, IOUT = IRATED Min Ty p Max U nits 6 120 mA EZ1582 30 120 EZ1581 33 120 EZ1580 60 120 C ontrol Pi n C urrent (3) EZ1583 Adjust Pi n C urrent Mi ni mum Load C urrent(4) IADJ VPWR = 2.05V, VCTL = 4.5V, IOUT = 10mA 50 120 µA IOUT(MIN) VPWR = VOUT + 0.8V, VCTL = 5V 5 10 mA ICL VPWR = VOUT + 0.8V, VCTL = 4.5V, 1.6 DVOUT = 100mV 3.1 C urrent Li mi t EZ1583 EZ1582 EZ1581 5.1 EZ1580 7.1 Ri pple Rejecti on Rati o(5) Thermal Regulati on (6) RA VPWR = VCTL = 5V, I O = IRATED REG (THERMAL) 60 A 80 0.002 dB 0.02 %/W NOTES: (1) Low duty cycle pulse testing with Kelvin connections required. (2) Minimum input to output voltage differential required to maintain 1% regulation. (3) Current used to drive the output section. (4) Required to maintain regulation. Resistor divider R1, R2 is usually utilized for minimum load current. (5) VRIPPLE = 1VPK-PK, 120Hz. (6) 30ms. (7) IRATED = 1.5A for EZ1583, 3A for EZ1582, 5A for EZ1581 and 7A for EZ1580. ã 2001 Semtech Corp. 3 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Pin Configurations Ordering Information D ev ice(1) P ackag e IOUT (A) TO-220, 5-pi n(2) 7 Pin Function EZ1580C T-X.X 1 SNS EZ1581C T-X.X 5 2 AD J EZ1582C T-X.X 3 3 OUT EZ1583C T-X.X 1.5 4 C TL EZ1580C M-X.X.TR 5 PWR EZ1581C M-X.X.TR 5 EZ1582C M-X.X.TR 3 EZ1583C M-X.X.TR 1.5 Tab i s OUT TO-263, 5-pi n (3) 7 Notes: (1) Where -X.X denotes voltage options. Available voltages are: 1.5V and 2.5V. Leave blank for adjustable version (1.3 to 5.7V). (2) Only available in tube packaging. A tube contains 50 devices. (3) Only available in tape and reel packaging. A reel contains 800 devices. Block Diagram Pin Descriptions Pin # Sy mbol Pin N ame Pin Function 1 SNS SENSE Thi s pi n i s the posi ti ve si de of the reference voltage for thi s devi ce. Wi th thi s pi n i t i s possi ble to Kelvi n sense the output voltage at the load. 2 AD J AD JUST Thi s pi n i s the negati ve si de of the reference voltage for thi s devi ce. Transi ent response can be i mproved by addi ng a small bypass capaci tor from the adjust pi n to ground. 3 OUT OUTPUT Thi s i s the power output of the devi ce. Thi s pi n i s electri cally connected to the tab. 4 C TL C ONTROL Thi s pi n i s the supply pi n for the control ci rcui try for the devi ce. The current flow i nto thi s pi n wi ll be approxi mately 1% of the output current. For the devi ce to regulate, the voltage on thi s pi n must be between 1.0V and 1.3V greater than the output voltage. 5 PWR POWER Thi s i s the collector i nput to the power devi ce of the EZ1583. The ouput load current i s suppli ed through thi s pi n. For the devi ce to regulate, the voltage on thi s pi n must be between 0.1V and 0.8V greater than the output voltage, dependi ng upon load current. ã 2001 Semtech Corp. 4 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Applications Information The EZ158X is a low dropout regulator designed to power low voltage microcontrollers, graphics ICs, sound cards etc. fan costs. For lower current applications, the heatsink might be eliminated altogether. For a load of 7A at 2.5V, the regulator would dissipate 17.5W when converting from 5V, but only 5.6W from a 3.3V input. The dropout voltage is minimized by utilizing a separate input voltage, VCTL, which should exceed VOUT by at least 1.3V. The 2.5V (for example) power for the load can be derived from a 3.3V system supply. Since the efficiency of a linear regulator is the ratio of the output to the input voltage, heat dissipation is reduced by using a 3.3V input (versus a 5V one), thereby lowering heatsink and cooling Remote Kelvin sensing of the output voltage can be achieved by connecting the sense pin to the output at the load. Remote sensing will reduce errors associated with resistive trace losses between regulator and processor. Outline Drawing - TO-220-5 Outline Drawing - TO-263-5 ã 2001 Semtech Corp. 5 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Minimum Land Pattern - TO-263-5 Contact Information Semtech Corporation Power Management Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 ã 2001 Semtech Corp. 6 www.semtech.com