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| IMP3 7 POWER MANAGEMENT Low Dropout Positive Voltage Regulators - 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. 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. Key Features x Low Dropout Voltage - 0.8V maximum at 100mA - 0.95V maximum at 800mA - 20% lower dropout voltage than "1117" LDO regulators x Guaranteed Low Dropout Voltage at Multiple Current Levels x 1% Trimmed 2.5V, 3.0V and 3.3V Outputs x Reduced Quiescent Current: 75A Maximum x Short Circuit and Thermal Protection x Space Saving SOT-223 Surface Mount Package x "1117" Pin Compatible Applications x x x x x x 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 3 RCS 2 Input Out (Tab) IMP37 + - Current Limit Thermal Protection Error Amp - + + Ref - 1 GND 37_01.eps (c) 1999 IMP, Inc. 408-432-9100/www.impweb.com 1 IMP3 7 Pin Configuration SOT-223 3 IMP37 TAB IS VOUT 2 OUT TAB IS VOUT INPUT 3 IMP37 2 1 1 GND 37_04.eps 37_05.eps TO-263 INPUT OUT GND Front View Front View Pin Descriptions Pin Number 1 2 3 TAB Package Marking Code Name GND OUT INPUT TAB Function Ground Pin Output Voltage Input Voltage Output Voltage 37_Table03.eps Part Number IMP37-25JST IMP37-30JST IMP37-33JST IMP37-25JCM IMP37-30JCM IMP37-33JCM Package SOT-223 SOT-223 SOT-223 TO-263 TO-263 TO-263 Device Marking 3725 3730 3733 3725JCM 3730JCM 3733JCM 37_Table05.eps Ordering Information Output Options Voltage 2.5V 3.0V 3.3V Part Ordering Number Dropout Voltage at 800mA 0.95V 0.95V 0.95V Maximum Quiescent Current 75A 75A 75A SOT-223 Package IMP37-25JST IMP37-30JST IMP37-33JST TO-263 Package IMP37-25JCM IMP37-30JCM 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 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. Storage Temperature Range . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering) . . . . . . . . . . . . . 300C for 10 seconds 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 -25 -30 IOUT = 10mA, VIN = 4.85V, TJ = 25C 10mA IOUT IMAX, 4.25V VIN 5.5V IOUT = 10mA, VIN = 5V, TJ = 25C 10mA IOUT IMAX, 4.75V VIN 5.5V IOUT = 10mA, VIN = 5V, TJ = 25C 10mA IOUT IMAX, 4.75V VIN 5.5V IOUT = 10mA, 4.25V (VIN) 5.5V IOUT = 10mA, 4.5V VIN 5.5V IOUT = 10mA, 4.5V VIN 5.5V IOUT = 10mA, 4.25V (VIN) 5.5V, TA = 25C IOUT = 10mA, 4.5V VIN 5.5V, IOUT = 10mA, 4.5V VIN 5.5V, TA = 25C TA = 25C Min 2.475 2.45 2.97 2.94 3.267 3.235 Typ 2.5 2.5 3.00 3.00 3.30 3.30 12 12 12 2.8 2.8 2.8 25 25 25 Max 2.525 2.55 3.03 3.06 3.333 3.365 19 19 19 4.3 4.3 4.3 30 30 30 0.8 0.95 Units V -33 Line Regulation (Note 1) -25 -30 -33 -25 -30 -33 mV Line Regulation (Note 1) mV Load Regulation (Note 1) -25 -30 -33 VIN = 4.25V, 5mA IOUT 800mA VIN = 4.75V, 5mA IOUT 800mA VIN = 4.75V, 5mA IOUT 800mA IOUT = 100mA IOUT = 800mA TJ = 25C VIN 6V TA = 25C, 30ms Pulse fRIPPLE = 120Hz, VIN = 5V, TA = 25C VRIPPLE = 1Vp-p, ILOAD= 10mA TA = 125C, 1000 Hrs (% of VOUT), 10Hz f 10kHz, TJ = 25C Junction-to-Case at TAB (TO-223) Junction-to-Case at TAB (TO-263) 51 800 mV Dropout Voltage (Note 2) Current Limit Minimum Load Current Quiescent Current Thermal Regulation Ripple Rejection Temperature Stability Long Term Stability RMS Output Noise Thermal Resistance IQ IOUT(MAX) -xx V -xx -xx -xx 950 1200 5.0 mA mA A %/W dB % % % C/W 37_t07.eps 36 0.01 54 0.5 0.3 0.003 15 10 75 0.1 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. 408-432-9100/www.impweb.com 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). 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 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 Output Bypass Capacitor (ESR < 0.5) 10F Tantalum, 100F Aluminum An input bypass capacitor is recommended. A 10F or larger tantalum capacitor is suitable for most applications. Table 2. Thermal Resistance of Packages Package Type SOT-223 TO-263 Thermal Resistance Junction to Tab, JT 15C/W 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 VIN * IN OUT GND 3.3V + + ** * 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) B Inches Min A A1 B B1 C D e e1 E h S t Q Q1 Q2 Millimeters Max Min 1.70 0.10 3.15 0.85 0.35 6.70 2.30 NOM 4.50 NOM 3.70 7.30 1.05 1.30 10 MAX 16 16 10 10 3.30 6.70 0.85 1.10 Max 1.50 0.02 2.95 0.65 0.25 6.30 Plastic SOT-223 (4-Pin)* 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 E H S e Q1 Q B1 Q2 D A A1 e1 C SOT-223 (4-Pin).eps TO-263 (3-Pin) E L2 A C2 TO-263 (3-Pin)** 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 D L L1 B2 e B C 0 - 8 TO-263 (3-Pin).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 |
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