Page No. : 1/7 RS7202 250mA Low Quiescent Linear Regulator with Enable General Description The RS7202 series is a positive voltage regulator with high accuracy output voltage and ultra‐low quiescent current which is typically 2.0μA. The device is ideal for handheld communication equipments and battery powered applications which require low quiescent current. The RS7202 consists of a bandgap reference voltage source, an error amplifier, a P‐channel pass transistor, a resistor‐ divider for setting output voltage, a current limiter, and temperature limit protection circuit. The high‐accuracy output voltage is preset at an internally trimmed voltage 1.8V, 2.5V or 3.3V. Other output voltages can be mask‐ optioned from 1.2V to 5.0V with 100mV increment except the RS7202‐13 which has 1.3V output voltage and RS7202‐185 which has 1.85V output voltage. The RS7202 has been designed to be used with low cost ceramic capacitors and requires a minimum output capacitor of 1.0μF. The device is available in SOT‐25 package. Features Applications ● 2.0μA Quiescent Current (Typ.) ● Operating Voltages Range：+1.8V to +6V ● Output Voltages Range：+1.2V to +5.0V with 100mV Increment ● Maximum Output Current：250mA ● Low Dropout: 150mV@100mA (VOUT≧2.0V) ● High Accuracy of Output Voltage： ±2.0% : VOUT≧2.5 V ±50mV : VOUT≦2.5 V ● High Ripple Rejection：60dB ● Output Current Limit Protection (350mA) ● Short Circuit Protection (200mA) ● Thermal Overload Shutdown Protection ● Low ESR Capacitor Compatible ● SOT‐25 Package ● RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen Free with Commercial Standard) ● ● ● ● ● ● ● Battery‐powered equipment Voltage regulator for microprocessor Voltage regulator for LAN cards Wireless Communication equipment Audio/Video equipment Post Regulator for Switching Power Home Electric/Electronic Appliance Application Circuits DS‐RS7202‐05 April, 2011 www.Orister.com Page No. : 2/7 This integrated circuit can be damaged by ESD. Orister Corporation recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. Pin Assignments SOT‐25 PIN CODE (NE) 1 2 3 4 5 PACKAGE SOT‐25 DESCRIPTION SYMBOL VIN GND EN NC VOUT Regulator Input Pin Ground Pin Chip Enable Pin No Connection Regulator Output Pin Ordering Information DEVICE DEVICE CODE RS7202‐XX EE YY Z XX is nominal output voltage (for example, 12 = 1.2V, 20 = 2.0V, 33 = 3.3V, 285 = 2.85V). EE is EN Input Logic, Internal Pull‐Up / Down Resistor : (see EN Functions Table) YY is package & Pin Assignments designator : NE : SOT‐25 Z is Lead Free designator : P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package G: Green (Halogen Free with Commercial Standard) EN Functions Table EE Code GR GP EN H L H L Operational State ON OFF OFF ON DS‐RS7202‐05 April, 2011 www.Orister.com Page No. : 3/7 Block Diagram Absolute Maximum Ratings Parameter Symbol Ratings Units Input Voltage VIN to GND VIN 7.0 V EN to GND Voltage ‐ 7.0 V EN to Input Voltage ‐ 0.3 V Output Current Limit, I(LIMIT) ILIMIT 350 mA o Junction Temperature TJ +155 C o 250 Thermal Resistance SOT‐25 C/W θJA Power Dissipation SOT‐25 PD 400 mW o Operating Ambient Temperature TOPR ‐40 ~ +85 C o Storage Temperature TSTG ‐55~+150 C o Lead Temperature (soldering, 10sec) ‐ +260 C NOTE: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and function operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute‐maximum–rated conditions for extended periods may affect device reliability. Electrical Characteristics (TA=25°C, unless otherwise specified) Symbol VIN Parameter Input Voltage VOUT Output Voltage IMAX ILIMIT ISC IQ VDROP ΔVLINE ΔVLOAD VIH VIL IEN eN PSRR TC THYS Output Current Current Limit Short Circuit Current Quiescent Current Dropout Voltage Line Regulation Load Regulation EN Pin Input Voltage “H” EN Pin Input Voltage “L” EN Pin Leakage Current Output Noise Ripple Rejection Output Voltage Temperature Coefficient Thermal Shutdown Hysteresis Conditions ‐ VIN=VOUT+1.0V, VOUT≦2.5V VIN=VOUT+1.0V, VOUT≧2.5V ‐ ‐ VOUT=0V, VIN＞VOUT+0.48V ILOAD=0mA, VIN=VOUT+1.0V VOUT≧2.5V, IOUT=100mA VOUT+1.0V≦VIN≦6V, ILOAD=1mA IOUT=1mA to 100mA (see note 2) (see note 2) ‐ F=10KHz, COUT=1uF F=100Hz, COUT=1uF IOUT=1mA, ‐40°C≦TA≦80°C ‐ Min. 1.8 ‐0.05 ‐2% 250 ‐ ‐ ‐ ‐ ‐ ‐ 1.0 ‐ ‐ ‐ ‐ ‐ ‐ Typ. ‐ VOUT ‐ 0.5 200 2.0 150 0.1 0.01 ‐ ‐ 0.05 150 60 100 10 Max. 6.0 +0.05 +2% ‐ ‐ 300 4.5 200 0.2 0.02 ‐ 0.3 0.1 ‐ ‐ ‐ ‐ Unit V V mA A mA uA mV %/V %/mA V V uA uV(rms) dB ppm/oC o C DS‐RS7202‐05 April, 2011 www.Orister.com Page No. : 4/7 Detail Description The RS7202 is a low quiescent current LDO linear regulator. The device provides preset 1.8V, 2.5V and 3.3V output voltages for output current up to 350mA. Other mask options for special output voltages from1.5V to 5.0V with 100mV increment are also available. As illustrated in function block diagram, it consists of a 1.23V voltage, error amplifier, a P‐channel pass transistor, an ON/OFF control logic, and an internal feedback voltage divider. The 1.23V bandgap reference is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the voltage difference. If the feedback voltage is lower than the reference voltage, the pass‐transistor gate is pulled lower, which allows more current to pass to the output pin and increases the output voltage. If the feedback voltage is too high, the pass‐transistor gate is pulled up to decrease the output voltage. The output voltage is feedback through an internal resistive divider connected to VOUT pin. Additional blocks include with output current limiter and shutdown logic. Internal P‐channel Pass Transistor The RS7202 features a P‐channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P‐channel MOSFETs require no base drive, which reduces quiescent current. PNP–based regulators also waste considerable current in dropout conditions when the pass transistor saturates, and use high base‐drive currents under large loads. The RS7202 does not suffer from these problems and consumes only 2.0μA (Typical) of current consumption under light loads. Enable Function EN pin starts and stops the regulator. When the EN pin is switched to the power off level, the operation of all internal circuit stops, the build‐in P‐channel MOSFET output transistor between pins VIN and VOUT is switched off, allowing current consumption to be drastically reduced. The VOUT pin enters the GND level due to the several MΩ resistance of the feedback voltage divider between VOUT and GND pins. Output Voltage Selection The RS7202 output voltage is preset at an internally trimmed voltage 1.8V, 2.5V or 3.3V. The output voltage also can be mask‐optioned from 1.2V to 5.0V with 100mV increment by special order (but only 1.28V in stead of 1.3V). The first two digits of part number suffix identify the output voltage (see Ordering Information). For example, RS7202‐33 has a preset 3.3V output voltage. Current Limit The RS7202 also includes a fold back current limiter. It monitors and controls the pass‐transistor’s gate voltage, estimates the output current, and limits the output current within 350mA. Thermal Overload Protection Thermal overload protection limits total power dissipation in the RS7202. When the junction temperature exceeds TJ=+155°C, a thermal sensor turns off the pass transistor, allowing the IC to cool down. The thermal sensor turns the pass transistor active again after the junction temperature cools down by 10°C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the RS7202 in the event of fault conditions. For continuous operation, the maximum operating junction temperature rating of TJ=+125°C should not be exceeded. Dropout Voltage A regulator’s minimum input‐output voltage differential, or dropout voltage, determines the lowest usable supply voltage. In battery‐powered systems, this will determine the useful end‐of‐life battery voltage. The RS7202 uses a P‐channel MOSFET pass transistor, its dropout voltage is a function of drain‐to‐source on‐resistance (RDS(ON)) multiplied by the load current. VDROPOUT = VIN − VOUT = RDS (ON ) × IOUT DS‐RS7202‐05 April, 2011 www.Orister.com Page No. : 5/7 SOT‐25 Dimension NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion. D. Falls within JEDEC MO‐193 variation AB (5 pin). DS‐RS7202‐05 April, 2011 www.Orister.com Page No. : 6/7 Soldering Methods for Orister’s Products 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface‐mount devices Figure 1: Temperature profile tP Critical Zone TL to TP TP Ramp-up TL tL Temperature Tsmax Tsmin tS Preheat 25 Ramp-down t 25oC to Peak Time Profile Feature Average ramp‐up rate (TL to TP) Sn‐Pb Eutectic Assembly o <3 C/sec Pb‐Free Assembly <3oC/sec ‐ Temperature Min (Tsmin) 100oC 150oC ‐ Temperature Max (Tsmax) 150oC 200oC 60~120 sec 60~180 sec Preheat ‐ Time (min to max) (ts) Tsmax to TL o ‐ Ramp‐up Rate <3 C/sec <3 C/sec Time maintained above: o 217oC 183 C ‐ Temperature (TL) ‐ Time (tL) 60~150 sec Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp‐down Rate Time 25oC to Peak Temperature o o o 60~150 sec 240 C +0/‐5 C 260oC +0/‐5oC 10~30 sec 20~40 sec <6oC/sec <6oC/sec <6 minutes <8 minutes Peak temperature Dipping time 3. Flow (wave) soldering (solder dipping) Products o Pb devices. o 245 C ±5 C o Pb‐Free devices. o 260 C +0/‐5 C 5sec ±1sec 5sec ±1sec DS‐RS7202‐05 April, 2011 www.Orister.com Page No. : 7/7 Important Notice: © Orister Corporation Orister cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an Orister product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. Orister reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in Orister’s terms and conditions of sale, Orister assumes no liability whatsoever, and Orister disclaims any express or implied warranty relating to the sale and/or use of Orister products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent Orister deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. Orister and the Orister logo are trademarks of Orister Corporation. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. DS‐RS7202‐05 April, 2011 www.Orister.com