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| AME, Inc. AME8843 750mA CMOS LDO n General Description The AME8843 family of positive, linear regulators feature low quiescent current (30A 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. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. The AME8843 is stable with an output capacitance of 2.2F or greater. n Functional Block Diagram IN OUT Overcurrent Shutdown Thermal Shutdown R1 AMP Vref=1.215V R2 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% 30A 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 IN OUT AME8843 OUT GND C1 5V 1F C2 2.2F 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. AME8843 750mA CMOS LDO n Pin Configuration SOT-223 Top View AME8843 1. VIN 2. GND 3. VOUT AME8843 1 2 3 n Ordering Information AME8843 x x x x x x Special Feature Voltage Number of Pins Package Type Operating Temperature Range Pin Configuration Operating Temperature Range E: -40OC to 85OC Pin Configuration Package Type Number of Pins T: 3 Voltage Special Feature A: 1. VIN 2. GND 3. VOUT G: SOT-223 180: V=1.8V 250: V=2.5V Z: Lead Free 2 AME, Inc. AME8843 750mA CMOS LDO n Ordering Information (contd.) Part Number AME8843AEGT180 AME8843AEGT180Z AME8843AEGT250 AME8843AEGT250Z Marking AWZyww AWZyww AWFyww AWFyww Output Voltage 1.8V 1.8V 2.5V 2.5V Package SOT-223 SOT-223 SOT-223 SOT-223 Operating Temp. Range - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability. n Absolute Maximum Ratings Parameter Input Voltage Output Current Input, Output Voltage ESD Classification Maximum 8 1 GND - 0.3 to VDD + 0.3 B Unit V A V 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 4.5 to 5.5 - 40 to + 85 - 40 to + 125 Unit V o C C o n Thermal Information Parameter Thermal Resistance (jc ) Internal Power Dissipation (PD ) ( T = 100oC) Maximum Junction Temperature Maximum Lead Temperature (10 Sec) SOT-223 SOT-223 Maximum 15 625 150 300 Unit o C/W mW o C C 3 o AME, Inc. AME8843 750mA CMOS LDO n Electrical Specifications TA = 25OC unless otherwise noted Parameter Input Voltage Output Voltage Accuracy Symbol VIN VO IO=750mA VO=VO(NOM) -2.0% IO=1mA 1.3V<=VO(NOM)<=1.4V Dropout Voltage VDROPOUT 1.4V o o Test Condition Min Note 1 -1.5 Typ Max 7 1.5 1900 Units V % See 1400 chart 1000 750 mV mA mA mA 50 A A % C C ppm/ oC Output Voltage Noise eN 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 2.2F 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 0.1F ceramic capacitor with a 10F 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 0.1F 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. AME8843 Ground Current vs. Input Voltage 45 40 750mA CMOS LDO Load Step (1mA-600mA) Vo(10mV/DIV) Ground Current ( A) 35 30 25 85 OC Out put C L=2. 2F CI N=2. 2F 15 10 5 0 0 1 2 3 4 5 6 7 8 IL(200mA/DIV) 20 25 C O I Load 0 Input Voltage (V) TIME ( 20mS/DIV) Drop Out Voltage vs. Output Voltage 0.3 0 -10 Power Supply Rejection Ratio Drop Out Voltage (V) 0.25 ILOAD=600mA PSRR (dB) -20 -30 -40 -50 -60 0.2 CL=2.2F Tantalum C BYP =0 100mA 0.15 0.1 100mA 10mA 0.05 -70 -80 2 2.5 3 3.5 4 4.5 5 5.5 10 100 A 1K 100 A 100K 1mA 10M 0 Output Voltage (V) Frequency (Hz) Safe Operating Area 750 500 Output Current (mA) 75OC rise VIN(1V/DIV) Line Transient Response SOT-223 370 With HS capable of twice jc 3 1.2 2 Input-Output Voltage Differential (V) VOUT(10mV/DIV) C LOAD =2.2F I LOAD =1mA V OUTDC =3.3V V INDC =4.5V TIME (200mS/DIV) 6 AME, Inc. AME8843 Noise Measurement I OUT (200mA/DIV) 750mA CMOS LDO Overtemperature Shutdown Vo (1mV DIV) CL=2.2F No Filter 0 R LOAD=6.6 VOUT (1V/DIV) 0 TIME (20ms/DIV) TIME (0.5Sec/DIV) Current Limit Response IOUT (200mV/DIV) VOUT (1V/DIV) Short Circuit Response CLOAD=2.2F CIN=1F RLOAD<100m IOUT (200mA/DIV) VOUT (1V/DIV) CLOAD=2.2F CIN=1.0F RLOAD=3.3 VOUTNOM=3.3V TIME (2mS/DIV) TIME (2mS/DIV) 7 AME, Inc. AME8843 750mA CMOS LDO n Package Dimension SOT-223 Top View D B1 Side View SYMBOLS c C MILLIMETERS MIN MAX 0.10 0.84 5.00 0.38 6.71 3.71 INCHES MIN 0.0004 0.0236 0.1140 0.0094 0.2480 0.1299 MAX 0.0039 0.0330 0.1969 0.0150 0.2640 0.1460 A1 B B1 C D E e 0.01 0.60 2.90 0.24 6.30 3.30 13o(4X) H E e Front View F A1 B 13o(4X) 2.30 BSC 6.70 0 o 0.0906 BSC 0.2638 0 o H 7.30 10 o 0.2874 10 o 8 www.ame.com.tw E-Mail: sales@ame.com.tw 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. (c) AME, Inc. , June 2004 Document: 2013-DS8843-A Corporate Headquarter AME, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan, R.O.C. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989 U.S.A.(Subsidiary) Analog Microelectronics, Inc. 3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489 |
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