AME AME8848 n General Description The AME8848 of positive, linear regulators feature low quiescent current (30µA typ.) with low dropout voltage, making them ideal for battery applications. The spacesaving SOT-223 packages are attractive for "Pocket" and "Hand Held" applications. 1A CMOS LDO n Functional Block Diagram IN OUT Overcurrent Shutdown These rugged devices have both thermal shutdown, and current fold-back to prevent device failure under the "Worst" operating conditions. R1 Thermal Shutdown The AME8848 is stable with an output capacitance of 2.2µF or greater. AMP Vref=1.215V n Features R2 GND l Very Low Dropout Voltage l Guaranteed 1A Output l Accurate to within +1.5% l 30µA Quiescent Current l Over-Temperature Shutdown n Typical Application l Current Limiting l Short Circuit Current Fold-back l Space-Saving SOT-223 Packages IN IN l Factory Pre-set Output Voltages AME8848 OUT OUT GND l Low Temperature Coefficient l All AME's Lead Free Products Meet RoHS Standards 5V C1 C2 1µF 2.2µF n Applications l Instrumentation l Portable Electronics l Wireless Devices l Cordless Phones l PC Peripherals l Battery Powered Widgets Rev.A.04 1 AME AME8848 1A CMOS LDO n Pin Configuration SOT-223 Top View AME8848AEGT 1. IN 2. GND(TAB) AME8848 3. OUT 1 2 3 * Die Attach: Conductive Epoxy n Ordering Information AME8848 x x x x xxx x Special Feature Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration Pin Configuration A: 1. IN 2. GND 3. OUT (SOT-223) 2 Operating Ambient Temperature Range E: -40OC to +85OC Package Type G: SOT-223 Number of Pins T: 3 Output Voltage 180: V=1.8V 250: V=2.5V 330: V=3.3V Special Feature Z: Lead Free Rev.A.04 AME AME8848 1A CMOS LDO n Ordering Information Part Number Marking* Output Voltage Package Operating Ambient Temperature Range AME8848AEGT180Z BLIyww 1.8V SOT-223 - 40oC to +85oC AME8848AEGT250Z BLJyww 2.5V SOT-223 - 40oC to +85oC AME8848AEGT330Z BLKyww 3.3V SOT-223 - 40oC to +85oC Note: ww & yww represents the date code pls refer to Date Code Rule on Package Dimension. * A line on top of the first letter represents lead free plating such as BLIyww. Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability. Rev.A.04 3 AME AME8848 1A CMOS LDO n Absolute Maximum Ratings Parameter Maximum Unit 8 V 1.2 A GND - 0.3 to VIN + 0.3 V Input Voltage Output Current Input, Output Voltage B* ESD Classification Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device. *HBM B:2000V~3999V n Recommended Operating Conditions Parameter Symbol Rating Unit Ambient Temperature Range TA - 40 to +85 o Junction Temperature Range TJ - 40 to +125 o Storage Temperature Range TSTG - 65 to +150 o C C C n Thermal Information Parameter Package Thermal Resistance* (Junction to Case) SOT-223 Thermal Resistance (Junction to Ambient) SOT-223 Internal Power Dissipation SOT-223 Solder Iron(10 Sec)** Die Attach Conductive Epoxy Symbol Maximum θ JC 25 o θJA 120 o PD 900 350 Unit C/W C/W mW o C * Measure θJC on backside center of tab. ** MIL-STD-202G 210F 4 Rev.A.04 AME AME8848 1A CMOS LDO n Electrical Specifications TA = 25OC unless otherwise noted. Parameter Input Voltage Output Voltage Accuracy Test Condition Symbol VIN VOUT IOUT=1mA Min Max Units Note 1 7 V -1.5 1.5 % 1700 See 1200 chart 1000 1.8V<=VOUT(NOM)<=2.0V Dropout Voltage VDROP IOUT=1A VOUT=VOUT(NOM) - 2.0% Typ 2.0V<VOUT(NOM)<=2.8V 2.8V<VOUT(NOM) mV Output Current IOUT VOUT>=1.8V 1000 mA Output Current Limit ILIM VOUT>=1.8V 1100 mA Output Short Circuit Current ISC VOUT<0.8V 400 800 mA Quiescent Current IQ IOUT=0mA 30 50 µA Ground Pin Current IGND IOUT=1mA to 1000mA 35 Output Voltage Line Regulation Output Voltage Load Regulation REGLINE REGLOAD µA IOUT=1mA 1.8V<=VOUT<=2.0V -0.15 VIN =VOUT+1 to 2.0V<VOUT<4.0V -0.1 0.02 0.1 VOUT+2 VOUT>=4.0V -0.4 0.2 0.4 0.4 1.2 IOUT = 1mA to 1000mA 0.15 % % Thermal Shutdown Temperature TSHDN 150 o C Temperature Hysterisis THYS 30 o C TC 30 Output Voltage Temperature Coefficient Power Supply Ripple Rejection Output Voltage Noise PSRR eN IOUT=100mA COUT=2.2µF f =10Hz to 100KHz IOUT=10mA f =100Hz 60 f =1KHz 50 f =10KHz 20 COUT=2.2µF 30 ppm/oC dB µVrms Note1: VIN(MIN) = VOUT + V DROP 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. Rev.A.04 5 AME AME8848 1A CMOS LDO n Detailed Description n External Capacitors The AME8848 of CMOS regulators contains a PMOS pass transistor, voltage reference, error amplifier, overcurrent protection, and thermal shutdown. The AME8848 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. The P-channel MOSFET 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 1100mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The AME8848 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8848 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. 6 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. Rev.A.04 AME AME8848 1A CMOS LDO Ground Current vs. Input Voltage Load Step (1mA-1000mA) 45 85O C 35 30 25 O 25 C 20 15 10 5 0 0 1 2 3 4 5 COUT = 2.2µF CIN = 2.2µF IO UT (500mA/DIV) VOUT (10mV/DIV) Ground Current (µA) 40 6 7 VOUT I OUT 8 Time (20mS/DIV) Input Voltage (V) Dropout Voltage vs. Output Voltage Power Supply Ripple Rejection Ratio 0 1600 Top to Bottom IOUT = 1000mA IOUT = 800mA IOUT = 600mA IOUT = 400mA IOUT = 200mA 1200 1000 -10 100mA 800 600 -30 -40 -50 400 -60 200 -70 0 1.8 2.5 3.3 4 5 -80 10 Rev.A.04 100 µ A 1K 100 µ A 1mA 100K 10M Noise Measurement VOUT (1mV/DIV) VOUT (1mV/DIV) VIN (1V/DIV) Line Transient Response Time (2mS/DIV) 10mA 100mA Frequency (Hz) Output Voltage (V) VIN = 5.0V COUT = 2.2µF COUT = 2.2µF Tantalum -20 PSRR (dB) Dropout Voltage (mV) 1400 COUT = 2.2µF No Filter Time (20ms/DIV) 7 AME AME8848 1A CMOS LDO COUT = 2.2µF CIN = 1.0µF VOUT(NOM) = 3.3V Time (2mS/DIV) 8 Short Circuit Response VOUT (1V/DIV) IOUT (500mV/DIV) IOUT (500mA/DIV) VOUT (1V/DIV) Current Limit Response C OUT = 2.2µF C IN = 1µF R LOAD < 100mΩ Time (2mS/DIV) Rev.A.04 AME AME8848 1A CMOS LDO n Date Code Rule Marking Date Code Year A A A W W xxx0 A A A W W xxx1 A A A W W xxx2 A A A W W xxx3 A A A W W xxx4 A A A W W xxx5 A A A W W xxx6 A A A W W xxx7 A A A W W xxx8 A A A W W xxx9 n Tape and Reel Dimension SOT-223 P W AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Rev.A.04 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size SOT-223 12.0±0.1 mm 4.0±0.1 mm 2500pcs 330±1 mm 9 AME AME8848 1A CMOS LDO n Package Dimension SOT-223 Top View Side View SYMBOLS D B1 θ C MILLIMETERS INCHES 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 3.15 0.1140 0.1240 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 o 13 (4X) H PIN 1 E e Front View 10 2.30 BSC e 0.0906 BSC F 1.40 1.80 0.0551 0.0709 F H 6.70 7.30 0.2638 0.2874 A1 θ 13 o(4X) 0 o 10 o 0 o 10o B Rev.A.04 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. , November 2008 Document: 2095-DS8848-A.04 Corporate Headquarter AME, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel : 886 2 2627-8687 Fax: 886 2 2659-2989