AME, Inc. 750mA CMOS LDO AME8843 n General Description The AME8843 family of positive, linear regulators feature low quiescent current (30µA typ.) with low dropout voltage, making them ideal for battery applications. The space-saving SOT-223 package is attractive for "Pocket" and "Hand Held" applications. n Functional Block Diagram IN OUT Overcurrent Shutdown R1 Thermal Shutdown These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. AMP The AME8843 is stable with an output capacitance of 2.2µF or greater. R2 Vref=1.215V GND n Features l l l l l l l l l l Very Low Dropout Voltage Guaranteed 750mA Output Accurate to within 1.5% 30µA Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Space-Saving SOT-223 Package Factory Pre-set Output Voltages Low Temperature Coefficient n Typical Application IN OUT IN AME8843 OUT GND 5V C1 C2 1µ µF 2.2µ µF n Applications l l l l l l l Instrumentation Portable Electronics Wireless Devices Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales 1 AME, Inc. 750mA CMOS LDO AME8843 n Pin Configuration SOT-223 Top View AME8843 1 2 AME8843 1. VIN 2. GND 3. VOUT 3 n Ordering Information AME8843 x x x x x x Special Feature Voltage Number of Pins Package Type Operating Temperature Range Pin Configuration Pin Configuration A: 1. VIN 2. GND 3. VOUT 2 Operating Temperature Range Package Type Number of Pins E: -40OC to 85OC G: SOT-223 T: 3 Voltage 180: V=1.8V 250: V=2.5V Special Feature Z: Lead Free AME, Inc. 750mA CMOS LDO AME8843 n Ordering Information (contd.) Part Number Marking Output Voltage Package Operating Temp. Range AME8843AEGT180 AWZyww 1.8V SOT-223 - 40oC to + 85oC AME8843AEGT180Z AWZyww 1.8V SOT-223 - 40oC to + 85oC AME8843AEGT250 AWFyww 2.5V SOT-223 - 40oC to + 85oC AME8843AEGT250Z AWFyww 2.5V SOT-223 - 40oC to + 85oC Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability. n Absolute Maximum Ratings Parameter Maximum Unit Input Voltage 8 V Output Current 1 A GND - 0.3 to VDD + 0.3 V Input, Output Voltage ESD Classification B Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device n Recommended Operating Conditions Parameter Supply Voltage Ambient Temperature Range Junction Temperature Rating Unit 4.5 to 5.5 V - 40 to + 85 o C - 40 to + 125 o C n Thermal Information Parameter Thermal Resistance (θjc ) Internal Power Dissipation (PD ) (∆ T = 100oC) Maximum SOT-223 15 SOT-223 625 Unit o C/W mW Maximum Junction Temperature 150 o Maximum Lead Temperature (10 Sec) 300 o C C 3 AME, Inc. 750mA CMOS LDO AME8843 n Electrical Specifications TA = 25OC unless otherwise noted Parameter Test Condition Symbol Input Voltage VIN Output Voltage Accuracy VO IO=1mA Min Typ Max Units Note 1 7 V -1.5 1.5 % 1.3V<=VO(NOM)<=1.4V Dropout Voltage VDROPOUT IO=750mA 1.4V<VO(NOM)<=2.0V VO=VO(NOM) -2.0% 2.0V<VO(NOM)<=2.8V 1900 See 1400 chart 1000 mV 750 2.8V<VO(NOM) IO VO>1.2V 750 mA Current Limit ILIM VO>1.2V 1500 2000 mA Short Circuit Current ISC VO<0.8V 750 Quiescent Current IQ IO=0mA 30 Ground Pin Current IGND IO=1mA to 750mA 35 Output Current Line Regulation Load Regulation Over Temperature Shutdown Over Temperature Hysterisis VO Temperature Coefficient Power Supply Rejection Output Voltage Noise REGLINE REGLOAD mA 50 µA 1.3V <= V O <= 1.4V -0.2 0.2 IO=1mA 1.4V < V O <= 2.0V -0.15 0.15 V IN =VO+1 to VO+2 2.0V < V O < 4.0V -0.1 0.02 0.1 4.0V <= V O -0.4 0.2 0.4 0.2 1 IO=1mA to 750mA µA % % 150 o C OTH 30 o C TC 30 OTS PSRR eN IO=100mA CO=2.2µF f=10Hz to 100kHz IO=10mA,CBY P=0µF f=1kHz 50 f=10kHz 20 f=100kHz 15 Co=2.2µF 30 ppm/ oC dB µVrms Note1: VIN(MIN)=VOUT+VDROPOUT Note2: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before a current source load is applied. 4 AME, Inc. AME8843 750mA CMOS LDO n Detailed Description The AME8843 family of CMOS 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 become active when the junction temperature exceeds 150oC, or the current exceeds 750mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The AME8843 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8808 also incorporates current foldback 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. n External Capacitors The AME8843 is stable with an output capacitor to ground of 2.2µF 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 0.1µF ceramic capacitor with a 10µF 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 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection. 5 AME, Inc. 750mA CMOS LDO AME8843 Ground Current vs. Input Voltage Load Step (1mA-600mA) Vo(10mV/DIV) 45 85 OC 35 30 Output C L=2.2µF CIN=2.2µF 25 O 25 C 20 IL(200mA/DIV) Ground Current (µ µ A) 40 15 10 5 ILoad 0 0 0 1 2 3 4 5 6 7 8 TIME ( 20mS/DIV) Input Voltage (V) Drop Out Voltage vs. Output Voltage Power Supply Rejection Ratio 0 0.3 ILOAD=600mA 0.2 0.15 0.1 100mA CL=2.2µF Tantalum C BYP =0 -20 PSRR (dB) Drop Out Voltage (V) -10 0.25 -30 -40 -50 10mA 100mA -60 0.05 -70 100 µ A 100 µ A 1mA -80 0 2 2.5 3 3.5 4 4.5 5 5.5 10 Output Voltage (V) 1K 100K Frequency (Hz) Safe Operating Area Line Transient Response 75OC rise SOT-223 370 With HS capable of twice θjc 3 1.2 2 Input-Output Voltage Differential (V) 6 VOUT(10mV/DIV) Output Current (mA) 500 VIN(1V/DIV) 750 C LOAD =2.2µF I LOAD =1mA V OUTDC =3.3V V INDC =4.5V TIME (200mS/DIV) 10M AME, Inc. 750mA CMOS LDO AME8843 0 R LOAD=6.6 Ω VOUT (1V/DIV) CL=2.2µF No Filter Overtemperature Shutdown I OUT (200mA/DIV) Vo (1mV DIV) Noise Measurement 0 TIME (20ms/DIV) TIME (0.5Sec/DIV) TIME (2mS/DIV) IOUT (200mV/DIV) CLOAD=2.2µF CIN=1.0µF RLOAD=3.3Ω VOUTNOM=3.3V Short Circuit Response CLOAD=2.2µF CIN=1µF RLOAD<100mΩ VOUT (1V/DIV) IOUT (200mA/DIV) VOUT (1V/DIV) Current Limit Response TIME (2mS/DIV) 7 AME, Inc. 750mA CMOS LDO AME8843 n Package Dimension SOT-223 Top View Side View SYMBOLS D B1 c £ C 13o(4X) H E e MILLIMETERS MIN MAX MIN MAX A1 0.01 0.10 0.0004 0.0039 B 0.60 0.84 0.0236 0.0330 B1 2.90 5.00 0.1140 0.1969 C 0.24 0.38 0.0094 0.0150 D 6.30 6.71 0.2480 0.2640 E 3.30 3.71 0.1299 0.1460 2.30 BSC e Front View 13o(4X) F A1 8 H θ B INCHES 6.70 0 o 0.0906 BSC 7.30 10 o 0.2638 0 o 0.2874 10 o www.ame.com.tw E-Mail: [email protected] Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. AME, Inc. , June 2004 Document: 2013-DS8843-A Corporate Headquarter U.S.A.(Subsidiary) AME, Inc. Analog Microelectronics, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan, R.O.C. 3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2046 Tel: 886 2 2627-8687 Fax: 886 2 2659-2989 Tel : (408) 988-2388 Fax: (408) 988-2489