IMP3 7 POWER MANAGEMENT Low Dropout Positive Voltage Regulators Key Features Low Dropout Voltage - 0.8V maximum at 100mA - 0.95V maximum at 800mA - 20% lower dropout voltage than "1117" LDO regulators Guaranteed Low Dropout Voltage at Multiple Current Levels 1% Trimmed 2.5V, 3.0V and 3.3V Outputs Reduced Quiescent Current: 75A Maximum Short Circuit and Thermal Protection Space Saving SOT-223 Surface Mount Package "1117" Pin Compatible - 800mA - 2.5V, 3.0V and 3.3V Output The IMP37 series of Low Dropout (LDO) three-terminal voltage regulators feature guaranteed low dropout voltages at currents up to 0.8A. The IMP37 regulator family dropout voltage is guaranteed to be 0.95V or lower at 0.8A. At 100mA, the maximum dropout voltage is 0.8V. Compared with "1117" type LDOs, the IMP37 has a 20% lower dropout voltage. Three fixed output voltages are offered: 2.5V, 3.0V and 3.3V. Output voltages are factory trimmed to within 1% of the nominal value. In addition to low dropout voltages, the IMP37 family features greatly reduced quiescent operating current. The 75A maximum specification represents an over 100 times improvement over competitive devices. Applications Devices are short circuit protected, and a thermal protection circuit shuts the regulator off should the junction temperature exceed 165C. The IMP37 is available in low-profile plastic SOT-223 and TO-263 packages and are pin compatible with fixed "1117" devices. High-efficiency linear power supplies Post regulator for switching supplies 5V to 3.3V linear regulators USB hubs Battery chargers Routers, ISDN/DSL modems Block Diagram Input 3 RCS 2 Out (Tab) IMP37 Error Amp + + - Current Limit - Thermal Protection + Ref - 1 GND (c) 1999 IMP, Inc. 408-432-9100/www.impweb.com 37_01.eps 1 IMP3 7 Pin Configuration SOT-223 TO-263 INPUT 3 IMP37 TAB IS VOUT 2 OUT 1 GND IMP37 TAB IS VOUT 3 INPUT 2 OUT 1 GND 37_04.eps 37_05.eps Front View Front View Pin Descriptions Package Marking Code Pin Number Name Function 1 GND Ground Pin 2 OUT Output Voltage IMP37-25JST SOT-223 3725 Input Voltage IMP37-30JST SOT-223 3730 IMP37-33JST SOT-223 3733 IMP37-25JCM TO-263 3725JCM IMP37-30JCM TO-263 3730JCM IMP37-33JCM TO-263 3733JCM 3 INPUT TAB TAB Part Number Output Voltage 37_Table03.eps Package Device Marking 37_Table05.eps Ordering Information Output Options Part Ordering Number Voltage Maximum Quiescent Current Dropout Voltage at 800mA SOT-223 Package TO-263 Package 2.5V 75A 0.95V IMP37-25JST IMP37-25JCM 3.0V 75A 0.95V IMP37-30JST IMP37-30JCM 3.3V 75A 0.95V IMP37-33JST IMP37-33JCM 37_t06.eps Note: Tape and reel shipping is available for the SOT-223 and TO-263 packages. Append the TAPE AND REEL designation "/T" to the ordering part number for tape and reel devices. For example, the IMP37-25JST/T is a 2.5V SOT-223 packaged device shipped in reels. 2 408-432-9100/www.impweb.com (c) 1999 IMP, Inc. IMP3 7 Absolute Maximum Ratings Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 7V Operating Junction Temperature . . . . . . . . . 0C to 150C Storage Temperature Range . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering) . . . . . . . . . . . . . 300C for 10 seconds These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Electrical Characteristics Specifications apply over the junction operating temperature range of TJ = 0C to +125C unless otherwise noted. Parameter Output Voltage Symbol Suffix Conditions VOUT Line Regulation (Note 1) Line Regulation (Note 1) Min Typ Max Units IOUT = 10mA, VIN = 4.85V, TJ = 25C 10mA IOUT IMAX, 4.25V VIN 5.5V 2.475 2.5 2.525 V 2.45 2.5 2.55 -30 IOUT = 10mA, VIN = 5V, TJ = 25C 2.97 3.00 3.03 2.94 3.00 3.06 -33 10mA IOUT IMAX, 4.75V VIN 5.5V IOUT = 10mA, VIN = 5V, TJ = 25C 3.267 3.30 3.333 3.235 3.30 3.365 -25 10mA IOUT IMAX, 4.75V VIN 5.5V IOUT = 10mA, 4.25V (VIN) 5.5V 12 19 -25 -30 IOUT = 10mA, 4.5V VIN 5.5V 12 19 -33 IOUT = 10mA, 4.5V VIN 5.5V IOUT = 10mA, 4.25V (VIN) 5.5V, TA = 25C 12 19 2.8 4.3 TA = 25C 2.8 4.3 TA = 25C 2.8 4.3 VIN = 4.25V, 5mA IOUT 800mA VIN = 4.75V, 5mA IOUT 800mA 25 30 25 30 VIN = 4.75V, 5mA IOUT 800mA IOUT = 100mA 25 30 -25 -30 -33 Load Regulation (Note 1) -25 -30 -33 Dropout Voltage (Note 2) Current Limit -xx IOUT(MAX) -xx TJ = 25C IQ -xx 800 VIN 6V TA = 25C, 30ms Pulse Ripple Rejection fRIPPLE = 120Hz, VIN = 5V, TA = 25C VRIPPLE = 1Vp-p, ILOAD= 10mA Temperature Stability Long Term Stability TA = 125C, 1000 Hrs RMS Output Noise (% of VOUT), 10Hz f 10kHz, TJ = 25C Junction-to-Case at TAB (TO-223) Junction-to-Case at TAB (TO-263) 950 408-432-9100/www.impweb.com mV V 1200 mA 5.0 mA 36 75 A 0.01 0.1 %/W 51 54 dB 0.5 % 0.3 % 0.003 % 15 C/W 10 Notes: 1. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured with low duty cycle pulse testing to maintain a constant junction temperature. 2. Dropout voltage is specified over the full output current range. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. 3. Minimum load current is defined as the minimum output current required to maintain regulation. (c) 1999 IMP, Inc. mV 0.95 -xx Thermal Regulation Thermal Resistance 0.8 IOUT = 800mA Minimum Load Current Quiescent Current IOUT = 10mA, 4.5V VIN 5.5V, IOUT = 10mA, 4.5V VIN 5.5V, mV 37_t07.eps 3 IMP3 7 Application Information The IMP37 voltage regulator ICs offer self-protection features which include short-circuit current protection and automatic thermal shutdown (for junction temperature above 165C). Circuit Stability Like all regulators, an output filter capacitor is required for circuit stability. Besides smoothing the output, the output capacitor "completes" the regulator's frequency compensation. The ESR of the output capacitor should be less than 0.5. Low ESR capacitors are preferred. Table 1 shows recommended minimum capacitance values for both aluminum and tantalum capacitors. Larger values of output capacitance do not cause stability problems. Table 1. Recommended Output Bypass Capacitors Thermal Management The maximum operating junction temperature for the IMP37 devices is 150C. The junction temperature can be calculated when the power dissipation and ambient temperature are known with this equation: TJ = TA + (PD x JA). The thermal resistance from juntion-to-ambient (JA) is the sum of the three thermal resistances: JA = JT + TS + SA Where JT = Junction-to-Tab thermal resistance TS = Tab-to-Heat Sink thermal resistance SA = Heat Sink-to-Air thermal resistance Table 2. Thermal Resistance of Packages Output Bypass Capacitor (ESR < 0.5) 10F Tantalum, 100F Aluminum Thermal Resistance Package Type An input bypass capacitor is recommended. A 10F or larger tantalum capacitor is suitable for most applications. Junction to Tab, JT SOT-223 15C/W TO-263 10C/W The IMP37 series devices have thermal limiting circuitry to protect the device from over current. For continuous operation, the maximum junction temperature rating must not be exceeded. IMP37 IN VIN * + 3.3V OUT GND + ** * Min. 15F Tantalum or 100F Aluminum. Capacitor May Be Increased Without Limit. ** 10F Tantalum or 100F Aluminum 37_02.eps Figure 1. Fixed 3.3V Regulator 4 408-432-9100/www.impweb.com (c) 1999 IMP, Inc. IMP3 7 Package Dimensions Plastic SOT-223 (4-Pin) Inches Min B Millimeters Max Min Max Plastic SOT-223 (4-Pin)* E H e S Q1 D Q A B1 A1 Q2 e1 C SOT-223 (4-Pin).eps A C2 L2 D L L1 0 - 8 B2 e B 0.067 0.060 0.004 0.0008 0.124 0.116 0.033 0.026 0.014 0.010 0.264 0.248 0.0905 NOM 0.181 NOM 0.146 0.130 0.287 0.264 0.041 0.033 0.051 0.043 10 MAX 16 10 16 10 1.70 0.10 3.15 0.85 0.35 6.70 1.50 0.02 2.95 0.65 0.25 6.30 2.30 NOM 4.50 NOM 3.70 7.30 1.05 1.30 3.30 6.70 0.85 1.10 10 MAX 16 16 10 10 TO-263 (3-Pin)** TO-263 (3-Pin) E A A1 B B1 C D e e1 E h S t Q Q1 Q2 C TO-263 (3-Pin).eps A 0.160 0.190 B 0.020 0.039 B2 0.045 0.055 C 0.018 0.029 C2 0.045 0.055 D 0.340 0.380 E 0.380 0.405 e 0.100 BSC L 0.575 0.625 L1 0.090 0.110 L2 ------ 0.055 * JEDEC Drawing TO-261AA ** JEDEC Drawing TO-263AA Add /T to Part Number for Tape and Reel. 37_Table04.eps (c) 1999 IMP, Inc. 408-432-9100/www.impweb.com 5 IMP3 7 IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Tel: 800-438-3722 Fax: 408-434-0335 Fax-on-Demand: 1-800-249-1614 (USA) Fax-on-Demand: 1-303-575-6156 (International) e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners. (c) 1999 IMP, Inc. Printed in USA Publication #: 8002 Revision: C Issue Date: 07/22/99 Type: Preliminary