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| Dual Input Low Dropout Regulator POWER MANAGEMENT Description 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. 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 or fixed 2.5V voltage regulator available in the popular 5 pin TO-220 and TO-263 plastic packages. EZ1580/EZ1581 EZ1582/EZ1583 Features 540mV dropout @ 7A in dual supply mode (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 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) 3.3V POWER IN 5V CONTROL IN 5 4 U1 1 SNS EZ158XCX VREF 3 PWR CTL ADJ OUT 2.5V OUT R1 124 C3 68uF C1 33uF C2 10uF 2 R2 VOUT = VREF 1 + + I ADJ * R 2 R1 R2 124 GROUND GROUND Fixed Output Parts U1 1 SNS 3.3V POWER IN 5V CONTROL IN 5 4 PWR CTL GND C1 33uF GROUND C2 10uF 2 C3 68uF GROUND 3 2.5V OUT EZ158XCX-2.5 OUT 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 (~0.033F) capacitor can be used to bypass the ADJ pin to improve transient response, if needed. Revision: October 29, 2003 1 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Absolute Maximum Ratings Parameter Power Input Voltage Control Input Voltage Power Dissipation Thermal Resistance Junction to Ambient EZ158X TO-220 EZ158X TO-263 Thermal Resistance Junction to Case EZ1580/1 (TO-220 & TO-263) EZ1582/3 (TO-220 & TO-263) Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec. ESD Rating (Human Body Model) Symbol VPWR VCTL PD J A Maximum 7 13.2 Internally Limited 50 60 2 3 0 to +125 -65 to +150 300 2 Units V V W C/W J C TJ TSTG TLEAD ESD C/W C C C kV Electrical Characteristics(7) Unless specified: VOUT = VSNS, VADJ = 0V, CCTL = CPWR = COUT = 10F. Values in bold apply over full operating temperature range. Parameter Reference Voltage(1) (Adj. Voltage Versions) Output Voltage(1) (2.5V Version) Line Regulation(1) Load Regulation(1) VPWR Dropout Voltage EZ1581, EZ1582, EZ1583 VPWR Dropout Voltage EZ1580 (1)(2) (1)(2) Symbol VREF Test Conditions VPWR = 2.05V, VCTL = 4.5V, IOUT = 10mA VPWR = 2.05V, VCTL = 4.5V, 10mA < IOUT < IRATED Min 1.237 1.231 -1 -1.5 Typ 1.250 Max 1.263 1.269 Units V VOUT VPWR = 3.3V, VCTL = 4.5V, IOUT = 10mA VPWR = 3.3V, VCTL = 4.5V, 10mA < IOUT < IRATED VOUT +1 +1.5 % REG(LINE) REG(LOAD) VPWR = (VOUT + 0.8V) to 5.5V, VCTL = 4.5V to 12V, IOUT = 10mA VPWR = VOUT + 0.8V, VCTL = 4.5V, IOUT = 10mA to IRATED 1.0 1.0 3.0 5.0 mV mV VPWR - VOUT VCTL = 4.75V, I O = IRATED 0.40 0.50 0.50 0.60 V VCTL = 4.75V, I O = IRATED 0.54 0.70 0.62 0.80 V 2003 Semtech Corp. 2 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Electrical Characteristics (Cont.)(7) Unless specified: VOUT = VSNS, VADJ = 0V, CCTL = CPWR = COUT = 10F. Values in bold apply over full operating temperature range. Parameter Control Pin Current (3) EZ1583 EZ1582 EZ1581 EZ1580 Adjust Pin Current Minimum Load Current(4) Current Limit EZ1583 EZ1582 EZ1581 EZ1580 Ripple Rejection Ratio(5) Thermal Regulation (6) Symbol Test Conditions Min Typ Max Units ICTL VPWR = VOUT + 0.8V, VCTL = 4.5V, IOUT = IRATED 6 30 33 60 120 120 120 120 120 10 mA IADJ IOUT(MIN) VPWR = 2.05V, VCTL = 4.5V, IOUT = 10mA VPWR = VOUT + 0.8V, VCTL = 5V 50 5 A mA ICL VPWR = VOUT + 0.8V, VCTL = 4.5V, VOUT = 100mV 1.6 3.1 5.1 7.1 A RA REG (THERMAL) VPWR = VCTL = 5V, I O = IRATED 60 80 0.002 0.02 dB %/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. 2003 Semtech Corp. 3 www.semtech.com EZ1580/EZ1581 EZ1582/EZ1583 POWER MANAGEMENT Pin Configurations Pin 1 2 3 4 5 Function SNS AD J OUT CTL PWR Ordering Information Device(1) EZ1580CT-X.X EZ1581CT-X.X EZ1582CT-X.X EZ1583CT-X.X EZ1580CM-X.X.TR EZ1581CM-X.X.TR EZ1582CM-X.X.TR EZ1583CM-X.X.TR TO-263, 5-pin (3) P ackag e TO-220, 5-pin(2) IOUT (A) 7 5 3 2.5 7 5 3 2.5 - Tab is OUT Block Diagram EZ158xCM-X.XTRT(4) Notes: (1) Where -X.X denotes voltage options. Available voltage is: 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. (4) Lead free product. Where x = 0; 1; 2 or 3. X.X denotes voltage options. Pin Descriptions Pin # 1 2 3 4 Symbol SNS AD J OUT CTL Pin Name SENSE ADJUST OUTPUT CONTROL Pin Function This pin is the positive side of the reference voltage for this device. With this pin it is possible to Kelvin sense the output voltage at the load. This pin is the negative side of the reference voltage for this device. Transient response can be improved by adding a small bypass capacitor from the adjust pin to ground. This is the power output of the device. This pin is electrically connected to the tab. This pin is the supply pin for the control circuitry for the device. The current flow into this pin will be approximately 1% of the output current. For the device to regulate, the voltage on this pin must be between 1.0V and 1.3V greater than the output voltage. This is the collector input to the power device of the EZ1583. The ouput load current is supplied through this pin. For the device to regulate, the voltage on this pin must be between 0.1V and 0.8V greater than the output voltage, depending upon load current. 4 www.semtech.com 5 PWR POWER 2003 Semtech Corp. 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. 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 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. 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 2003 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 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2003 Semtech Corp. 6 www.semtech.com |
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