S5U2178 CMOS Low Dropout Voltage Regulator Elektronische Bauelemente RoHS Compliant Product Description The S5U2178 series positive,linear regulators feature low quiescent current (45µA typ.) with low dropout voltage, making them ideal for battery applications. Output voltage are set at the factory and trimmed to 1.5% accuracy.These rugged devices have both Thermal Shutdown and Current Fold-back to prevent device failure under the "Worst" of operating conditions. In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground.The S5U2178 is stable with an output capacitance of 4.7µF or greater. Features REF. * Low Temperature Coefficient * Over-Temperature Shutdown * Highly Accurate ± 1.5% * Very Low Dropout Voltage A b L4 c L1 E Millimeter Min. Max. 4.40 4.80 0.66 0.91 0.00 0.30 B 0.36 0.5 2.29 2.79 9.80 10.4 REF. c2 L2 D e L Millimeter Min. Max. 1.25 1.45 1.27 REF. 8.6 9.0 1.70 REF. 14.6 15.8 0˚ 8˚ * Noise Reduction Bypass Capacitor * Short Circuit Current Fold-back * Guaranteed 1.5 A output * Current Limiting * Power-Saving Shutdown Mode Applications * PC Peripherals * Wireless Devices * Portable Electronics * Battery Powered Widgets * Instrumentation Functional Block Diagram Typical Application Circuit S5U2178 http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 1 of 6 S5U2178 CMOS Low Dropout Elektronische Bauelemente Voltage Regulator Absolute Maximum Ratings Parameter Symbol Ratings Unit VIN 8 V Output Current IOUT PD/( VIN- VO) A Output Voltage VOUT 1.5~5.0 V Operating Ambient Temperature Topr -40 ~ +85 Tj -40 ~ +125 Tj Max 150 jc 5 PD 3000 Input Max Voltage Junction Temperature Maximum Junction Temperature Thermal Resistance Internal Power Dissipation( T=100 ) EDS Classification Output Voltage Symbol VOUT (E) Output Current Current Limit Load Regulation IO ILIM REGLOAD Dropout Voltage (Note1) VDROPOUT unless otherwise Condition Min Line Regulation Input Voltage Over Temperature Shutdown Over Temperature Hysterisis Output Voltage Temperature Coefficient Short Circuit Current - - A 1.5 2.0 - A IO=1mA to 1.5A -1 0.2 1 % 2.0V - - 1300 2.8V - - 800 - - 600 - 45 70 A A 1.5V<VOUT(T) IO=1.5A VO=VOUT(E)-2% 2.0V<VOUT(T) - 45 - -0.15 - 0.15 -0.1 0.02 0.1 -0.4 - 0.4 mV % Note3 - 7 - 150 - - 30 - TC - 30 - ppm/ - 750 - mA ISC Output Voltage Noise eN Output Voltage Noise eN http://www.SeCoSGmbH.com/ (Note2) VIN OTS OTH PSRR 01-Jun-2002 Rev. A V 1.5 IO=1mA~1.5A IO=1mA VOUT(T)<2.0V VIN=VOUT(T)+1 to 2.0V VOUT(T)<4.0V VOUT(T)+1 (T)+2 to (T)+1 to 4.0V VOUT(T) Power Supply Rejection Shutdown Supply Current 1.5% VOUT>1.2V IGND PSRR EN Input Bias Current Unit VOUT>1.2V IO=0mA Power Supply Rejection EN Input Threshold Max -1.5% IQ REGLINE TYP VOUT(T) VEN=VEHmin, IO=1mA 2.8V<VOUT(T) Quiescent Current Ground Pin Current mW B Electrical Characteristics VIN=VOUT(T)+2V, VEN=VIN, TA=25 Parameter /W VEH VEL IEH IEL ISD VOUT<0.4V Io=100mA Co=4.7 F ceramic Io=100mA Co=4.7 F ceramic CBYP=0.01 F f=10Hz~100kHz Io=10mA, CBYP=0 F f=10Hz~100kHz Io=10mA, CBYP=0.01 F V f=1kHz - 50 - f=10kHz - 20 - f=1kHz - 75 - f=10kHz - 55 - Co=4.7 F - 30 - Vrms Co=4.7 F - 30 - Vrms 2.0 - VIN V 0 - 0.4 V dB dB VIN=7V - - 0.1 A VEN= 0V, VIN=7V - - 0.5 A VIN=5V, VOUT=0V, VEN=0V - 0.5 2 A Any changing of specification will not be informed individual Page 2 of 6 S5U2178 CMOS Low Dropout Elektronische Bauelemente Voltage Regulator Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT (T) + 2.0V” is provided at the VIN pin while maintaining a certain IOUT value). 2: VOUT (T) =Specified Output Voltage 3: VIN (MIN) =V OUT+VDROPOUT Ordering Information(contd.) Part Number S5U2178-15 S5U2178-25 S5U2178-47 Marking 8G152 XXXX 8G252 XXXX 8G472 XXXX Output Voltage Part Number 1.5V S5U2178-18 2.5V S5U2178-33 4.7V S5U2178-50 Marking Output Voltage 8G182 XXXX 8G332 XXXX 8G502 XXXX 1.8V 3.3V 5.0V Detailed Description The S5U 2178 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and thermal shutdown.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. Over-current and Thermal shutdown circuits o become active when the junction temperature exceeds140 C, or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC.The S5U 2178 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 Ω , the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds of 0.75 Ω . External Capacitors The S5U 2178 is stable with an output capacitance to ground of 4.7uF or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic 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 0.1uF ceramic capacitor with a 10uF 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. A third capacitor can be connected between the BY-PASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001~0.01uF. A large capacitor improves the AC ripple rejection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. All capacitors should be placed in closed proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection. Enable When EN pin is 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. 100KΩ resistor is necessary between VEN source and EN pin when VEN is high than VIN. (Note: There is no internal pull-up for EN pin. It can not be floating.) ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 3 of 6 S5U2178 Elektronische Bauelemente CMOS Low Dropout 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 6 S5U2178 Elektronische Bauelemente http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A CMOS Low Dropout Voltage Regulator Any changing of specification will not be informed individual Page 5 of 6 S5U2178 Elektronische Bauelemente ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A CMOS Low Dropout Voltage Regulator Any changing of specification will not be informed individual Page 6 of 6