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| AME, Inc. AME8861 600mA CMOS LDO n General Description The AME8861 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-25 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. In applications requiring a low noise, regulated supply, place a 1000 pF capacitor between Bypass and ground. The AME8861 is stable with an output capacitance of 2.2F or greater. n Functional Block Diagram IN OUT Overcurrent Shutdown Thermal Shutdown EN BYP AMP R1 n Features l l l l l l l l l Very Low Dropout Voltage 600mA Output Accurate to within 1.5% 30A Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Noise Reduction Bypass Capacitor Power-Saving Shutdown Mode Vref=1.215V R2 GND n Typical Application INPUT IN OUT OUTPUT AME8861 BYP GND EN l Space-Saving SOT-25 Package l Factory Pre-set Output Voltages l Low Temperature Coefficient C1 5V 1F C2 1000pF C3 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. AME8861 600mA CMOS LDO n Pin Configuration SOT-25 Top View 5 4 AME8861 AME8861 1. IN 2. GND 3. EN 4. BYP 5. OUT 1 2 3 n Ordering Information AME8861 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 Number of Pins V: 5 Pin Configuration Package Type Voltage Special Feature A: 1. 2. 3. 4. 5. IN GND EN BYP OUT E: SOT-2X 300: V=3.0V 250: V=2.5V 330: V=3.3V L: Low Profile Y: Lead Free & Low Profile Z: Lead Free Part Number AME8861AEEV250 AME8861AEEV300 AME8861AEEV330 2 Marking AXCww AWGww AXCww Output Voltage 2.5V 3.0V 3.3V Package SOT-25 SOT-25 SOT-25 Operating Temp. Range - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability. AME, Inc. AME8861 600mA CMOS LDO n Absolute Maximum Ratings Parameter Input Voltage Output Current Input, Output Voltage ESD Classification Maximum 8 PD / (VIN - VO) 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 n Recommended Operating Conditions Parameter Ambient Temperature Range Junction Temperature Rating - 40 to + 85 - 40 to + 125 Unit o o C C n Thermal Information Parameter Thermal Resistance (ja) Internal Power Dissipation (PD ) (DT = 100oC) Maximum Junction Temperature Maximum Lead Temperature (10 Sec) SOT-25 SOT-25 Maximum 260 380 150 300 Unit o C/W mW o C C o 3 AME, Inc. AME8861 600mA CMOS LDO n Electrical Specifications TA = 25OC unless otherwise noted Parameter Symbol Input Voltage Output Voltage Accuracy VIN VO IO=1mA 1.3V<=VO(NOM)<=1.4V Dropout Voltage VDROPOUT IO=600mA VO=VO(NOM) -2.0% 1.4V Test Condition Min Note 1 -1.5 Typ Max 7 1.5 1900 Units V % See 1400 chart 800 600 mV mA mA 600 50 mA A A C C ppm/ oC 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. AME8861 600mA CMOS LDO 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. n Detailed Description The AME8861 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 600mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The AME8861 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8861 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 Enable The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1A. This pin behaves much like an electronic switch. n External Capacitors The AME8861 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. A third capacitor can be connected between the BYPASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001 ~ 0.01F. A larger 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. 5 AME, Inc. AME8861 Ground Current vs. Input Voltage 40 600mA CMOS LDO Load Step (1mA-600mA) Vo(10mV/DIV) 45 Ground Current ( A) 35 30 25 85 O C 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 1200 0 -1 0 Power Supply Rejection Ratio Drop Out Voltage (V) 1000 ILOAD=600mA PSRR (dB) -2 0 -3 0 -4 0 -5 0 -6 0 800 C L =2.2F T antalum C B Y P =0 100m A 600 400 100m A 10m A 200 -7 0 -8 0 1 2 3 4 5 6 10 100 A 1K 100 A 100K 1m A 10M 0 Output Voltage (V) Frequency (Hz) Safe Operating Area -2 0 650 -3 0 Power Supply Rejection Ratio 100m A C L =2.2F T antalum C B Y P =1000pF Output Current (mA) 400 270 PSRR (dB) -4 0 1m A -5 0 100m A -6 0 -7 0 -8 0 10 10m A 100A 1K 100A 100K 10M 1.2 2 3 Input-Output Voltage Differential (V) Frequency (Hz) 6 AME, Inc. AME8861 Noise Measurement (200mA/DIV) 600mA CMOS LDO Overtemperature Shutdown Vo (1mV DIV) OUT C L =2.2F N o Filter 0 R L O A D =6.6 VOUT (1V/DIV) I 0 TIM E (20m s/DIV) TIM E (0.5Sec/DIV) Current Limit Response VOUT (1V/DIV) IOUT (200mV/DIV) Short Circuit Response C L O A D =2.2F C IN =1F R L O A D <100m IOUT (200mA/DIV) TIM E (2m S/DIV) VOUT (1V/DIV) C L O A D =2.2F C IN =1.0F R L O A D =3.3 V O U T N O M =3.3V TIM E (2m S/DIV) Chip Enable Transient Response Output (1V/DIV) Enable (2V/DIV) VIN(1V/DIV) Line Transient Response C L =2F R L =10 0 0 TIM E ( 1m S/DIV) VOUT (10mV/DIV) C L O A D =2.2F I L O A D =1m A V O U T D C =3.3V V IN D C =4.5V TIM E (200m S/DIV) 7 AME, Inc. AME8861 600mA CMOS LDO n Package Dimension SOT-25 Top View D Side View SYMBOLS A A1 b D E e H L e1 S1 MILLIMETERS MIN MAX 0.15 0.55 3.10 1.80 INCHES MIN 0.0000 0.0118 0.1063 0.0551 MAX 0.0059 0.0217 0.1220 0.0709 L 1.20REF 0.00 0.30 2.70 1.40 0.0472REF H E 1.90 BSC 2.60 3.00 0.07480 BSC 0.10236 0.11811 0.0146BSC 0o 10 o S1 e c 1 0.37BSC 0o 10o Front View A 0.95BSC 0.0374BSC b 8 A1 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 2003 Document: 2006-DS8861-D Corporate Headquarter AME, Inc. 2F, 189 Kang-Chien 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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