LP3881ES-1.8/NOPB

LP3881 www.ti.com SNVS224F – MARCH 2003 – REVISED APRIL 2013 LP3881 0.8A Fast-Response Ultra Low Dropout Linear Regulators Check for Samples: LP3881 FEATURES DESCRIPTION • • • • • • • • The LP3881 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. 1 2 Ultra Low Dropout Voltage (75 mV @ 0.8A Typ) Low Ground Pin Current Load Regulation of 0.04%/A 60 nA Typical Quiescent Current in Shutdown 1.5% Output Accuracy (25°C) TO-220, TO-263 and SOIC-8 Packages Over Temperature/Over Current Protection −40°C to +125°C Junction Temperature Range APPLICATIONS • • • • • • • DSP Power Supplies Server Core and I/O Supplies PC Add-in-Cards Local Regulators in Set-Top Boxes Microcontroller Power Supplies High Efficiency Power Supplies SMPS Post-Regulators The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220, TO-263 and SOIC-8 packages. Dropout Voltage: 75 mV (typ) @ 0.8A load current. Ground Pin Current: 3 mA (typ) at full load. Shutdown Current: 60 nA (typ) when S/D pin is low. Precision Output Voltage: 1.5% room temperature accuracy. TYPICAL APPLICATION CIRCUIT At least 4.7 µF of input and output capacitance is required for stability. 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2003–2013, Texas Instruments Incorporated LP3881 SNVS224F – MARCH 2003 – REVISED APRIL 2013 www.ti.com Connection Diagrams Figure 1. TO-220, Top View Figure 2. TO-263, Top View VOUT 1 VOUT 2 VBIAS 3 GND 4 GND 8 N/C 7 VIN 6 S/D 5 GND Figure 3. SOIC-8, Top View . . Block Diagram These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated Product Folder Links: LP3881 LP3881 www.ti.com SNVS224F – MARCH 2003 – REVISED APRIL 2013 ABSOLUTE MAXIMUM RATINGS (1) −65°C to +150°C Storage Temperature Range Lead Temp. (Soldering, 5 seconds) ESD Rating 260°C Human Body Model (2) 2 kV Machine Model (3) Power Dissipation (4) 200V Internally Limited VIN Supply Voltage (Survival) −0.3V to +6V VBIAS Supply Voltage (Survival) −0.3V to +7V −0.3V to +7V Shutdown Input Voltage (Survival) IOUT (Survival) Internally Limited −0.3V to +6V Output Voltage (Survival) −40°C to +150°C Junction Temperature (1) (2) (3) (4) Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications, see Electrical Characteristics. Specifications do not apply when operating the device outside of its rated operating conditions. The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin. The machine model is a 220 pF capacitor discharged directly into each pin. The machine model ESD rating of pin 5 is 100V. At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink thermal values. θJ-A for TO-220 devices is 65°C/W if no heatsink is used. If the TO-220 device is attached to a heatsink, a θJ-S value of 4°C/W can be assumed. θJ-A for TO-263 devices is approximately 40°C/W if soldered down to a copper plane which is at least 1.5 square inches in area. θJ-A value for typical SOIC-8 PC board mounting is 166°C/W. If power dissipation causes the junction temperature to exceed specified limits, the device will go into thermal shutdown. OPERATING RATINGS VIN Supply Voltage (VOUT + VDO) to 5.5V Shutdown Input Voltage 0 to +6V IOUT 0.8A −40°C to +125°C Operating Junction Temperature Range VBIAS Supply Voltage 4.5V to 6V Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated Product Folder Links: LP3881 3 LP3881 SNVS224F – MARCH 2003 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL = 10 mA, CIN = COUT = 4.7 µF, VS/D = VBIAS. Symbol VO Parameter Conditions Output Voltage Tolerance 10 mA < IL < 0.8A VO(NOM) + 1V ≤ VIN ≤ 5.5V 4.5V ≤ VBIAS ≤ 6V Min (1) Typical (2) 1.198 Max (1) Units 1.234 1.216 1.186 1.246 1.478 1.522 1.5 1.455 V 1.545 1.773 1.827 1.8 1.746 (3) 1.854 ΔVO/ΔVIN Output Voltage Line Regulation VO(NOM) + 1V ≤ VIN ≤ 5.5V 0.01 %/V ΔVO/ΔIL Output Voltage Load Regulation (4) 10 mA < IL < 0.8A 0.04 0.06 %/A VDO Dropout Voltage (5) IL = 0.8A (TO220 and TO263 only) 75 120 160 IL = 0.8A (SOIC only) 80 140 190 10 mA < IL < 0.8A 3 7 8 mA 0.03 1 30 µA 1 2 3 mA VS/D ≤ 0.3V 0.03 1 30 µA VOUT = 0V 2.5 IQ(VIN) Quiescent Current Drawn from VIN Supply VS/D ≤ 0.3V IQ(VBIAS) ISC Quiescent Current Drawn from VBIAS Supply Short-Circuit Current 10 mA < IL < 0.8A mV A Shutdown Input VSDT Output Turn-off Threshold Output = ON 1.3 0.7 Output = OFF 0.7 Td (OFF) Turn-OFF Delay RLOAD X COUT