MIC29310/29312 Micrel MIC29310/29312 3A Fast-Response LDO Regulator General Description Features The MIC29310 and MIC29312 are low cost versions of Low cost versions of MIC29300 family MIC29300 family low-dropout (LDO) regulators. Manufac- Fast transient response tured on Micrels proprietary Super beta PNP process, 3A current over full temperature range the MIC29310/2 is a 3A LDO regulator with very low-dropout 600mV dropout voltage at full load voltage (600mV over the full load) and low ground current. Low ground current Along with a total accuracy of 2% (over temperature, line Accurate 1% guaranteed tolerance and load regulation) these regulators feature very fast tran- Zero current shutdown mode (MIC29312) sient recovery from input voltage surges and output load Fixed voltage and adjustable versions current changes. Applications The MIC29310 is available in xed 3.3V and 5V outputs Processor peripheral and I/O supplies voltages the MIC29312 has an adjustable output which can PC add-in cards be set by two external resistors to a voltage between 1.24V High-ef ciency green computer systems to 15V. In addition, all versions are fully protected against High-ef ciency linear power supplies overcurrent faults, reversed input polarity, reversed lead High-ef ciency switching supply post regulator insertion, and overtemperature operation. Battery-powered equipment A TTL logic enable (EN) pin is available in the MIC29312 to shutdown the regulator. When not used, the device can be set to continuous operation by connecting EN to the input (IN). The MIC29310/2 is available in the standard 3- and 5-pin TO-220 and TO-263 packages with an operating junction temperature range of 0C to +125C. For applications requiring even lower dropout voltage, input voltage greater than 16V, or an error ag, see the MIC29300/29301/29302/ 29303. Typical Application MIC29312 On V OUT EN OUT Off R1* MIC29310-x.x V V V IN ADJ IN IN OUT IN OUT GND R2* GND R1 V = 1.240 + 1 OUT R2 * For best performance, total series resistance (R1 + R2) should be small enough to pass the minimum regulator load current of 10mA. Fixed Regulator Con guration Adjustable Regulator Con guration Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC29310/29312 Micrel Ordering Information Part Number Junction Temperature Voltage Package (1) Range Standard RoHS Compliant MIC29310-3.3BT MIC29310-3.3WT 3.3V 0C to +125C TO-220 MIC29310-3.3BU MIC29310-3.3WU 3.3V 0C to +125C TO-263 MIC29310-5.0BT MIC29310-5.0WT 5.0V 0C to +125C TO-220 MIC29310-5.0BU MIC29310-5.0WU 5.0V 0C to +125C TO-263 MIC29312BT MIC29312WT Adj. 0C to +125C TO-220 MIC29312BU MIC29312WU Adj. 0C to +125C TO-263 Note: 1. RoHS compliant with high-melting solder exemption. Pin Con guration 3OUT 3OUT 2GND 2GND 1IN 1IN MIC29310-x.xBT/WT MIC29310-x.xBU/WU TO-220-3 (T) TO-263-3 (U) 5ADJ 5ADJ 4OUT 4OUT 3GND 3GND 2IN 2IN 1EN 1EN MIC29312-x.xBU/WU MIC29312-x.xBT/WT TO-263-5 (U) TO-220-5 (T) Pin Description Pin Number Pin Number Pin Name Pin Function MIC29310 MIC29312 1 EN Enable (Input): Active-high, logic-level enable/shutdown control. 1 2 IN Unregulated Input: +16V maximum supply. 2, TAB 3, TAB GND Ground: Ground pin and TAB are internally connected. 3 4 OUT Regulator Output 5 ADJ Ouput Voltage Adjust: 1.24V feedback from external resistive divider. Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Input Voltage (V ) ..........................................20V to +20V Input Voltage (V ) ........................................ +2.3V to +16V IN IN Power Dissipation (P ) ............................. Internally Limited Junction Temperature (T ) ............................ 0C to +125C D J Storage Temperature Range (T ) ............. 65C to +150C Package Thermal Resistance S TO-263 ( ) ......................................................... 2C/W Lead Temperature (soldering, 5 sec.) ........................ 260C JC TO-220 ( ) ......................................................... 2C/W ESD, Note 3 JC TO-220 ( ) ....................................................... 55C/W JA MIC29310/29312 2 November 2006 TAB TAB TAB TAB
