RS1117A 1.0A Low Dropout Positive Voltage Regulator DESCRIPTION The RS1117A is a 1A low-dropout positive voltage regulator. It is available in fixed and adjustable output voltage versions. Over current and thermal protection are integrated onto the chip. Output current will limit as while it reaches the pre‐set current or temperature limit. The dropout voltage is specified at 1.40V Maximum at full rated output current. The RS1117A series provides excellent regulation over line, load and temperature variations. FEATURES Low Dropout Voltage 1.40V (Max.) at 1.0A Adjustable or Fixed Voltage (1.8V, 2.5V, 3.3V, 5.0V) Over Current Protection Thermal Overload Protection Maximum Line Regulation 0.2% Maximum Load Regulation 1.0% Adjust Pin Current Less Than 120μA APPLICATIONS SCSI-2 Active Termination High Efficiency Linear Regulators 5V to 3.3V Voltage Converter Battery Charger Battery Management Circuits for Notebook and Palmtop PCs Core Voltage Supply: FPGA, PLD, DSP, CPU APPLICATION CIRCUIT Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist.,New Taipei City 23145, Taiwan RS1117A ORDER INFORMATION Device Device Code RS1117A-XX YY Z XX is package designator: M: SOT-89 SJ: SOT-223 J: TO-252 YY is nominal output voltage designator: AD: ADJ 18: 1.8V 25: 2.5V 33: 3.3V 50: 5.0V Z is Lead Free designator: P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package G: Green (Halogen Free with Commercial Standard) PIN ASSIGNMENTS SOT-89 SOT-223 TO-252 PIN DESCRIPTION Package SOT-89 SOT-223 TO-252 V1.2 Pin No. 1 2 3 1 2, 4 3 1 2, 4 3 Pin Name ADJ/GND VOUT VIN ADJ/GND VOUT VIN ADJ/GND VOUT VIN Description Ground Pin or ADJ Terminal Pin for Adjustable. Regulator Output Pin Regulator Input Pin Ground Pin or ADJ Terminal Pin for Adjustable. Regulator Output Pin Regulator Input Pin Ground Pin or ADJ Terminal Pin for Adjustable. Regulator Output Pin Regulator Input Pin 2 May 2014 RS1117A FUNCTION DESCRIPTION OUTPUT VOLTAGE ADJUSTMENT Like most regulators, RS1117A series regulate the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version, the VREF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minimum output load). The output voltage is given by the following equation: VOUT =VREF (1+R2/R1) + IADJ R2 Figure 1 On fixed versions of RS1117A series, the voltage divider is provided internally. THERMAL PROTECTION RS1117A series have thermal protection which limits junction temperature to 150℃. However, device functionality is only guaranteed to a maximum junction temperature of +125℃. The power dissipation and junction temperature for RS1117A in all packages given by P D=(VIN-VOUT)IOUT, TJUNCTION=TAMBIENT+(PDθJA), Note: TJUNCTION must not exceed 125℃. CURRENT LIMIT PROTECTION RS1117A series are protected against overload conditions. Current protection is triggered at typically 1.5A. STABILITY AND LOAD REGULATION RS1117A series require a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 47μF tantalum or 100μF aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does not exceed 0.5Ω. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT=100μF or more is typical for high current regulator design. RS1117A series load regulation are limited by the resistance of the wire connecting it to the load(RP). For the adjustable version, the best load regulation is accomplished when the top of the resistor divider(R1) is connected directly to the output pin of the RS1117A series. When so connected, RP is not multiplied by the divider ratio. For fixed output versions, the top of R1 is internally connected to the output and ground pin can be connected to low side of the load as a negative side sense if, so desired. V1.2 3 May 2014 RS1117A Figure 2 THERMAL CONSIDERATION The RS1117A series contain thermal limiting circuitry designed to protect itself for over-temperature conditions. Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It contains junction-to-case, case-to-heat-sink interface and heat sink resistance itself. An additional heat sink is applied externally sometimes. It can increase the maximum power dissipation. For example, the equivalent junction temperature of 300mA output current is 115℃ without external heat sink. Under the same junction temperature IC can operates 500mA with an adequate heat sink. Therefore, to attach an extra heat sink is recommended. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. The bonding wires are appending paths. The former is the lowest resistance path. Proper mounting is required to ensure the best possible thermal flow this area of the package to the heat sink. Thermal compound at the case-to-heat-sink interface is strongly recommended. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer can be used, as long its thermal resistance is considered. PROTECTION DIODE (The figure is shown as Regulator with Reverse Diode Protection in advanced applications) In general operation, RS1117A series don’t need any protection diodes. From the cross-section structure of RS1117A series, the output pin is connected to P+ substrate, and the input pin is connected to N-well. There is a parasitic reverse diode between them. It can handle microsecond surge currents of 5A to 10A. Even with large output capacitance, it is very difficult to get those values of surge currents in normal operation. Only with high value output capacitors, such as 1000μF. And with the input pin instantaneously shorted to ground, can damage occur. A crowbar circuit at the input of the RS1117A series can generate those kinds of currents, and a diode from output to input is recommended. Normal power supply cycling or even plugging and unplugging in the system will not generate currents large enough to do any damage. V1.2 4 May 2014 RS1117A ABSOLUTE MAXIMUM RATINGS Parameter Input Voltage Power Dissipation Operating Junction Temperature Range Storage Temperature Range Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient Lead Temperature (Soldering) 5 sec. HBM (Human Body Mode) Symbol VIN PD TOPR TSTG θJC θJA TLEAD Ratings 15 Internally Limited (see Note) -20 to +125 -40 to +150 15 120 260 2 Unit V W ℃ ℃ ℃/W ℃/W ℃ KV/Min Note: SOT-223: 0.9W(Max.), SOT-89: 0.6W(Max.), TO-252: 0.9W(Max.), TO-220: 2.1W(Max.) ELECTRICAL CHARACTERISTICS (TA=25℃, unless otherwise specified) RS1117A-18 (1.8V) Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Quiescent Current Temp. Coefficient Temp. Stability RMS Output Noise Ripple Rejection Ratio Symbol VOUT REGLINE REGLOAD VDROPOUT IS IQ TC TS VN RA Test Conditions VIN=5V, IO=0A TJ=0℃ to 125℃ VIN=4.75V to 7V, IO=0A TJ=0℃ to 125℃ VIN=5V, IO=0A to 1A TJ=0℃ to 125℃ ΔVO=±1%, IO=0A to 1A TJ=0℃ to 125℃ VIN=4.75V to 7V TJ=0℃ to 125℃ VIN=5V, IO=0A to 1A TJ=0℃ to 125℃ VIN=4.75V to 7V, IO=0A to 1A TJ=0℃ to 125℃ VIN=5V, IO=100mA 10Hz ≦ f ≦ 10KHz TJ=25℃ VIN=5V, IO=1A TJ=0℃ to 125℃ Min. 1.764 1.0 60 Typ. 1.800 0.1 1.2 1.5 6.0 0.005 0.5 0.003 72 Max. 1.836 0.2 1.0 1.40 13 - Symbol VOUT REGLINE REGLOAD VDROPOUT IS IQ TC TS VN RA Test Conditions VIN=7V, IO=0A TJ=0℃ to 125℃ VIN=7V to 9V, IO=0A TJ=0℃ to 125℃ VIN=7V, IO=0A to 1A TJ=0℃ to 125℃ ΔVO=±1%, IO=0A to 1A TJ=0℃ to 125℃ VIN=7V to 10V TJ=0℃ to 125℃ VIN=7V, IO=0A to 1A TJ=0℃ to 125℃ VIN=7V to 10V, IO=0A to 1A TJ=0℃ to 125℃ VIN=5V, IO=100mA 10Hz ≦ f ≦ 10KHz TJ=25℃ VIN=5V, IO=1A TJ=0℃ to 125℃ Min. 4.900 1.0 60 Typ. 5.000 0.1 1.2 1.5 6.0 0.005 0.5 0.003 72 Max. 5.100 0.2 1.0 1.40 13 - Units V % V A mA %/℃ % %ΔVO dB RS1117A-50 (5.0V) Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Quiescent Current Temp. Coefficient Temp. Stability RMS Output Noise Ripple Rejection Ratio V1.2 5 Units V % V A mA %/℃ % %ΔVO dB May 2014 RS1117A RS1117A-33 (3.3V) Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Quiescent Current Temp. Coefficient Temp. Stability RMS Output Noise Ripple Rejection Ratio Symbol VOUT REGLINE REGLOAD VDROPOUT IS IQ TC TS VN RA Test Conditions VIN=5V, IO=0A TJ=0℃ to 125℃ VIN=4.75V to 7V, IO=0A TJ=0℃ to 125℃ VIN=5V, IO=0A to 1A TJ=0℃ to 125℃ ΔVO=±1%, IO=0A to 1A TJ=0℃ to 125℃ VIN=4.75V to 7V TJ=0℃ to 125℃ VIN=5V, IO=0A to 1A TJ=0℃ to 125℃ VIN=4.75V to 7V, IO=0A to 1A TJ=0℃ to 125℃ VIN=5V, IO=100mA 10Hz ≦ f ≦ 10KHz TJ=25℃ VIN=5V, IO=1A TJ=0℃ to 125℃ Min. 3.234 1.0 60 Typ. 3.300 ‐ 0.1 1.2 1.5 6.0 0.005 0.5 0.003 72 Max. 3.370 0.2 1.0 1.40 13 - Units V Symbol VOUT REGLINE REGLOAD VDROPOUT IS IQ TC TS VN RA Test Conditions VIN=5V, IO=0A TJ=0℃ to 125℃ VIN=4.75V to 7V, IO=0A TJ=0℃ to 125℃ VIN=5V, IO=0A to 1A TJ=0℃ to 125℃ ΔVO=±1%, IO=0A to 1A TJ=0℃ to 125℃ VIN=4.75V to 7V TJ=0℃ to 125℃ TJ=0℃ to 125℃ VIN=5V, IO=0A to 1A VIN=4.75V to 7V, IO=0A to 1A VIN=5V, IO=100mA TJ=0℃ to 125℃ 10Hz ≦ f ≦ 10KHz TJ=25℃ VIN=5V, IO=1A TJ=0℃ to 125℃ Min. 2.450 1.0 60 Typ. 2.500 ‐ 0.1 1.2 1.5 6.0 0.005 0.5 0.003 72 Max. 2.550 0.2 1.0 1.40 13 - V A mA %/℃ % %ΔVO dB Symbol VREF Test Conditions VIN=5V, IO=10mA TJ=0℃ to 125℃ VIN=4.75V to 7V, TJ=0℃ to 125℃ IO=10mA VIN=5V, IO=10mA to 1A TJ=0℃ to 125℃ ΔVO =±1%, TJ=0℃ to 125℃ IO=10mA to 1A VIN=2.7V to 7V TJ=0℃ to 125℃ VIN=2.75V to 7V, IO=10mA to 1A VIN=2.75V to 7V, TJ=0℃ to 125℃ IO=10mA to 1A VIN=2.75V to 7V, TJ=0℃ to 125℃ IO=10mA to 1A VIN=5V, IO=100mA TJ=0℃ to 125℃ VIN=5V 10Hz ≦ f ≦ 10KHz TJ=25℃ VIN=5V, IO=1A TJ=0℃ to 125℃ Min. 1.225 Typ. 1.250 Max. 1.275 Units V - ‐ 0.2 - 0.1 1.0 - 1.2 1.40 V 1.0 - 1.5 0.005 - A %/℃ - 55 120 - 0.2 5.0 60 0.5 5.0 0.003 72 10 - % V A mA %/℃ % %ΔVO dB RS1117A-25 (2.5V) Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Quiescent Current Temp. Coefficient Temp. Stability RMS Output Noise Ripple Rejection Ratio Units V % RS1117A-AD (ADJ) Parameter Reference Voltage Line Regulation Load Regulation REGLINE REGLOAD Dropout Voltage VDROPOUT Current Limit Temp. Coefficient IS TC Adjust Pin Current IADJ Adjust Pin Current Change Temp. Stability Minimum Load Current RMS Output Noise Ripple Rejection Ratio ΔIADJ V1.2 TS IO VN RA 6 % μA % mA %ΔVO dB May 2014 RS1117A CHARACTERISTICS CURVE V1.2 7 May 2014 RS1117A PACKAGE INFORMATION SOT-89 Symbol Millimeter A B C D E F Min. 4.40 4.05 1.50 2.40 0.36 *1.50 Max. 4.60 4.25 1.70 2.60 0.51 - G H I *3.00 1.40 0.35 1.60 0.41 Notes: 1. All dimensions are in millimeter. V1.2 8 May 2014 RS1117A SOT-223 Notes: 1. Refer to JEDEC TO-261 AA. 2. All dimensions are in millimeter. V1.2 9 May 2014 RS1117A TO-252 Notes: 1. Refer to JEDEC TO-252 AA. 2. All dimensions are in millimeter. V1.2 10 May 2014 RS1117A IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.2 11 May 2014