 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| AME AME8848 n General Description The AME8848 of positive, linear regulators feature low quiescent current (30A typ.) with low dropout voltage, making them ideal for battery applications. The spacesaving SOT-223 packages are 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" operating conditions. The AME8848 is stable with an output capacitance of 2.2F or greater. 1A CMOS LDO n Functional Block Diagram IN OUT Overcurrent Shutdown Thermal Shutdown R1 AMP n Features l Very Low Dropout Voltage l Guaranteed 1A Output l Accurate to within +1.5% l 30A Quiescent Current l Over-Temperature Shutdown l Current Limiting l Short Circuit Current Fold-back l Space-Saving SOT-223 Packages l Factory Pre-set Output Voltages l Low Temperature Coefficient l All AME's Lead Free Products Meet RoHS Standards IN Vref=1.215V R2 GND n Typical Application AME8848 OUT GND OUT IN C1 5V 1F C2 2.2F 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 n Pin Configuration SOT-223 Top View AME8848AEGT 1. IN 1A CMOS LDO AME8848 2. GND(TAB) 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 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 (SOT-223) 2 Rev.A.04 AME AME8848 n Ordering Information Part Number AME8848AEGT180Z AME8848AEGT250Z AME8848AEGT330Z 1A CMOS LDO Marking* BLIyww BLJyww BLKyww Output Voltage 1.8V 2.5V 3.3V Package SOT-223 SOT-223 SOT-223 Operating Ambient Temperature Range - 40oC to +85oC - 40oC to +85oC - 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 n Absolute Maximum Ratings Parameter Input Voltage Output Current Input, Output Voltage ESD Classification 1A CMOS LDO Maximum 8 1.2 GND - 0.3 to VIN + 0.3 B* Unit V A V Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device. *HBM B:2000V~3999V n Recommended Operating Conditions Parameter Ambient Temperature Range Junction Temperature Range Storage Temperature Range Symbol TA TJ TSTG Rating - 40 to +85 - 40 to +125 - 65 to +150 Unit o o o C C C n Thermal Information Parameter Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron(10 Sec)** Package SOT-223 SOT-223 SOT-223 Die Attach Symbol JC Maximum 25 120 900 350 Unit o C/W C/W mW o Conductive Epoxy JA PD o C * Measure JC on backside center of tab. ** MIL-STD-202G 210F 4 Rev.A.04 AME AME8848 n Electrical Specifications TA = 25OC unless otherwise noted. Parameter Input Voltage Output Voltage Accuracy Symbol VIN VOUT IOUT=1A VOUT=VOUT(NOM) - 2.0% 1A CMOS LDO Test Condition Min Note 1 Typ Max 7 1.5 Units V % IOUT=1mA 1.8V<=VOUT(NOM)<=2.0V -1.5 Dropout Voltage VDROP 2.0V 1.8V<=VOUT<=2.0V 1700 See 1200 chart 1000 1000 1100 400 30 35 -0.15 -0.1 -0.4 0.02 0.2 0.4 150 30 30 60 50 20 30 0.15 0.1 0.4 1.2 800 50 mV mA mA mA A A 2.0V % IOUT = 1mA to 1000mA % o C C o ppm/oC dB eN COUT=2.2F Vrms 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 n Detailed Description The AME8848 of CMOS regulators contains a PMOS pass transistor, voltage reference, error amplifier, overcurrent protection, and thermal shutdown. 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. 1A CMOS LDO n External Capacitors The AME8848 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. 6 Rev.A.04 AME AME8848 Ground Current vs. Input Voltage 45 40 1A CMOS LDO Load Step (1mA-1000mA) IO UT (500mA/DIV) VOUT (10mV/DIV) COUT = 2.2F CIN = 2.2F Ground Current (A) 35 30 25 20 15 10 5 0 0 1 2 3 4 85O C VOUT 25 C O I OUT 5 6 7 8 Input Voltage (V) Time (20mS/DIV) Dropout Voltage vs. Output Voltage 1600 1400 0 Power Supply Ripple Rejection Ratio -10 -20 Dropout Voltage (mV) 1200 1000 800 600 400 200 0 1.8 PSRR (dB) Top to Bottom IOUT = 1000mA IOUT = 800mA IOUT = 600mA IOUT = 400mA IOUT = 200mA COUT = 2.2F Tantalum 100mA -30 -40 -50 -60 -70 -80 10 100mA 10mA 100 A 1K 100 A 100K 1mA 10M 2.5 3.3 4 5 Output Voltage (V) Frequency (Hz) Line Transient Response VIN (1V/DIV) Noise Measurement VIN = 5.0V COUT = 2.2F VOUT (1mV/DIV) COUT = 2.2F No Filter VOUT (1mV/DIV) Time (2mS/DIV) Time (20ms/DIV) Rev.A.04 7 AME AME8848 Current Limit Response IOUT (500mA/DIV) VOUT (1V/DIV) VOUT (1V/DIV) IOUT (500mV/DIV) COUT = 2.2F CIN = 1.0F VOUT(NOM) = 3.3V 1A CMOS LDO Short Circuit Response C OUT = 2.2F C IN = 1F R LOAD < 100m Time (2mS/DIV) Time (2mS/DIV) 8 Rev.A.04 AME AME8848 n Date Code Rule Marking A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Date Code W W W W W W W W W W W W W W W W W W W W Year xxx0 xxx1 xxx2 xxx3 xxx4 xxx5 xxx6 xxx7 xxx8 xxx9 1A CMOS LDO n Tape and Reel Dimension SOT-223 P W AME PIN 1 AME Carrier Tape, Number of Components Per Reel and Reel Size Package SOT-223 Carrier Width (W) 12.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 2500pcs Reel Size 3301 mm Rev.A.04 9 AME AME8848 n Package Dimension SOT-223 Top View D B1 Side View 1A CMOS LDO SYMBOLS c C o MILLIMETERS MIN 0.01 0.60 2.90 0.24 6.30 3.30 INCHES MIN 0.0004 0.0236 0.1140 0.0094 0.2480 0.1299 MAX 0.10 0.84 3.15 0.38 6.71 3.71 MAX 0.0039 0.0330 0.1240 0.0150 0.2640 0.1460 A1 B B1 C D E 13 (4X) H E PIN 1 e Front View 13 o(4X) e F H B 2.30 BSC 1.40 6.70 0 o 0.0906 BSC 0.0551 0.2638 0 o 1.80 7.30 10 o 0.0709 0.2874 10o F A1 10 Rev.A.04 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. , 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 |
Price & Availability of AME8848AEGT250Z
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |