SQ2131 CMOS Positive Voltage Regulator Elektronische Bauelemente RoHS Compliant Product Description The SQ2131 is a fixed 1.2V of positive, linear regulators feature low quiescent current (60µA typ.) with low dropout voltage, making them ideal for battery applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. The SQ2131 is stable with an output capacitance of 2.2µF or greater. Features * High Accurate ± 3.0% REF. * Over-Temperature Shutdown * Power Good Output Function A B C D E F * Very Low Dropout Voltage * Low Temperature Coefficient * Short Circuit Current Fold-back * Guaranteed 150mA output Millimeter Min. Max. 2.70 3.10 2.60 3.00 1.40 1.80 0.30 0.55 0 0.10 0° 10° REF. G H I J K L Dimensions Millimeter 1.90 REF. 1.20 REF. 0.12 REF. 0.37 REF. 0.60 REF. 0.95 REF. * Current Limiting * Power-Saving Shutdown Mode Applications * PC Peripherals * Wireless Devices * Portable Electronics * Battery Powered Widgets Functional Block Diagram * Electronic Scales * Instrumentation * Cordless Phones Typical Application Circuit IN IN BYP + C1 5V 1uF http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A SQ2131 GND OUT OUT EN C2 2.2uF Any changing of specification will not be informed individual Page 1 of 5 SQ2131 CMOS Positive Elektronische Bauelemente Voltage Regulator Fig 1. Typical Application Schematic Fig 2. Typical Application For Processor VID Code Power Sequencing Schematic SQ2131 SQ2131 Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input 2 Gnd Ground 3 EN Enable/Shutdown (Input): CMOS Compatible Input Logic High= Enable; Logic Low= Shutdown. Do Not Leave Open 4 PG Power Good Output 5 VOUT Regulator Output Ordering Information(contd.) Part Number SQ2131-12 Marking Output Voltage 1C122 XXXX 1.2V Part Number Marking Output Voltage Detailed Description The SQ2131 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and thermal shutdown and Power Good function. The P-channel pass transistor receives data from the error amplifier,over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. o Over-current and Thermal shutdown circuits become active when the junction temperature exceeds150 C, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The SQ2131 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The SQ2131 also incorporates current fold-back to reduce power dissipation when the output is short circuited.This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. External Capacitors The SQ2131 is stable with an output capacitance to ground of 2.2uF or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Elertrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 uF ceramic capacitor with a 10 uF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1uF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable . The can be achieved with a "Star" connection. Enable The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1uA. This pin behaves much like an electronic switch. http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 2 of 5 SQ2131 CMOS Positive Elektronische Bauelemente Voltage Regulator Power Good The SQ2131 includes the Power Good feature.When the output is not within ± 15% of the specified voltage, it pulls low. This can occur under the following conditions: 1. Input Votage Too Low. 2. During Over-Temperature. 3. During Over-Current. 1. If Output Is Pulled Up. (Note: PG pin is an open-drain output.) Absolute Maximum Ratings Parameter Ratings Symbol Input Voltage VIN Output Current IOUT Iutput,Output Voltage V PD/(VIN-VO) mA V GND-0.3 to VIN+0.3 Topr Operating Ambient Temperature Max. Junction Temperature Thermal Resistance C Tj Max. -40~+125 150 θja 260 PD 380 B o T=100 C) o -40~+85 Tj Junction Temperature Power Dissipation ( EDS Classification Unit 7 o C o C o C /W mW o Electrical Characteristics Ta=25 C VIN=2.7v, VEN=VIN,IO=100uA unless otherwise noted Parameter Output Voltage Symbol Min. VO -3.0% _ 350 _ 4 % Io=0.1mA to 150mA mV Io=150mA,VOUT=Vo-2% Typ. Max. Unit Condition 3.0% V Io=0.1mA mA Vo<0.1V ILIM 150 Load Regulation REGLOAD -4 1 Dropout Voltage VDROPOUT _ _ 1300 60 80 Current Limit Quiescent Current IQ _ Ground Pin Current IGND _ REGLINE - 0.3 _ VIN 2.7 _ Line Regulation Input Voltage Over Temperature Shutdown OTS _ 65 _ 0.3 6 uA VIN=6V,Io=0mA,Vo=Vo(NOM) uA VIN=6V,Io=1mA to 150mA % Io=0.1mA,VIN=2.7V to 6V V 150 _ o _ 30 _ o C C Over Temperature Hystersis OTH Output Voltage Temperature Coefficient TC _ 30 PG Leakage Current ILC _ 0.1 _ uA VPG=6V,PG is off VOL _ _ 0.1 V ISINK=0.1mA 1.5 _ 5 ms _ 50 _ _ 20 _ _ 15 _ PG Voltage Low VPG Delay Power Supply Rejection TPGD PSRR _ ppm/ oC f=1kHz dB eN _ 30 _ uVrms Output Under Voltage VUV _ _ 95 %VO(NOM) VEH 1.6 _ VIN VEL 0 _ 0.4 Io=100mA Co=2.2uF f=10kHz f=100Hz Output Voltage Noise EN Input Threshold See Timing Diagram on Page 5 Co=2.2uF f=10Hz~100kHz Io=10mA PG ON @ % of VOUT V IEH _ 0.1 _ IEL _ 0.1 _ Shutdown Supply Current ISD _ 0.5 1 uA VIN=5V,Vo=0V,VEN=0V Shutdown Output Voltage Vo,SD 0 _ 0.4 V Output Loading ≤1200Ω,VEN=0V EN Input Bias Current uA VEN=VIN VEN=0V *Note1: VIN(MIN)=VOUT+VDROPOUT ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 3 of 5 SQ2131 Elektronische Bauelemente CMOS Positive Voltage Regulator Characteristics Curve http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 4 of 5 SQ2131 Elektronische Bauelemente CMOS Positive Voltage Regulator Timing Diagram http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 5 of 5