AME, Inc. 600mA CMOS LDO AME8861 n General Description The AME8861 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-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. n Functional Block Diagram IN OUT Overcurrent Shutdown Thermal Shutdown EN BYP R1 AMP The AME8861 is stable with an output capacitance of 2.2µF or greater. n Features l l l l l l l l l Very Low Dropout Voltage 600mA Output Accurate to within 1.5% 30µA Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Noise Reduction Bypass Capacitor Power-Saving Shutdown Mode l Space-Saving SOT-25 Package l Factory Pre-set Output Voltages l Low Temperature Coefficient R2 Vref=1.215V GND n Typical Application INPUT OUT IN OUTPUT AME8861 BYP 5V GND EN C1 C2 C3 1µ µF 1000pF 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. 600mA CMOS LDO AME8861 n Pin Configuration SOT-25 Top View 5 AME8861 1. IN 2. GND 3. EN 4. BYP 5. OUT 4 AME8861 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 Pin Configuration A: 1. 2. 3. 4. 5. 2 IN GND EN BYP OUT Operating Temperature Range Package Type Number of Pins E: -40OC to 85OC E: SOT-2X V: 5 Voltage Special Feature 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 Marking Output Voltage Package Operating Temp. Range AME8861AEEV250 AXCww 2.5V SOT-25 - 40oC to + 85oC AME8861AEEV300 AWGww 3.0V SOT-25 - 40oC to + 85oC AME8861AEEV330 AXCww 3.3V SOT-25 - 40oC to + 85oC Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability. AME, Inc. 600mA CMOS LDO AME8861 n Absolute Maximum Ratings Parameter Maximum Unit 8 V PD / (VIN - VO) A GND - 0.3 to VIN + 0.3 V Input Voltage Output Current 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 Ambient Temperature Range Junction Temperature Rating Unit - 40 to + 85 o - 40 to + 125 o C C n Thermal Information Parameter Thermal Resistance (θja) Internal Power Dissipation (PD ) (DT = 100oC) Maximum SOT-25 260 SOT-25 380 Unit o C/W mW Maximum Junction Temperature 150 o Maximum Lead Temperature (10 Sec) 300 o C C 3 AME, Inc. 600mA CMOS LDO AME8861 n Electrical Specifications TA = 25OC unless otherwise noted Parameter Symbol Input Voltage VIN Output Voltage Accuracy VO Test Condition IO=1mA Min Typ Max Units Note 1 7 V -1.5 1.5 % 1.3V<=VO(NOM)<=1.4V Dropout Voltage VDROPOUT IO=600mA 1.4V<VO(NOM)<=2.0V VO=VO(NOM) -2.0% 2.0V<VO(NOM)<=2.8V 1900 See 1400 chart 800 2.8V<VO(NOM) mV 600 IO VO>1.2V 600 Current Limit ILIM VO>1.2V 600 Short Circuit Current ISC VO<0.8V 300 600 mA Quiescent Current IQ IO=0mA 30 50 µA Ground Pin Current IGND IO=1mA to 600mA 35 Output Current Line Regulation Load Regulation REGLINE REGLOAD mA 800 mA µA 1.3V <= VO <= 1.4V -0.2 0.2 IO=1mA 1.4V < VO <= 2.0V -0.15 0.15 VIN =V O+1 to VO+2 2.0V < VO < 4.0V -0.1 0.02 0.1 V O >= 4.0V -0.4 0.2 0.4 0.2 1 % IO=1mA to 600mA % Over Temperature Shutdown OTS 150 o Over Temperature Hysterisis OTH 30 o TC 30 V O Temperature Coefficient Power Supply Rejection Output Voltage Noise PSRR eN IO=100mA f=1kHz 75 CO=2.2µF ceramic f=10kHz 55 CBY P=0.01µF f=100kHz 30 f=10Hz to 100kHz IO=10mA, Co=2.2µF 30 C C ppm/ oC dB µVrms CBY P=0.01µF VEH VIN =2.7V to 7V 2.0 Vin V V EL VIN =2.7V to 7V 0 0.4 V IEH VEN =V IN , V IN =2.7V to 7V 0.1 µA IEL VEN =0V, VIN =2.7V to 7V 0.5 µA Shutdown Supply Current ISD V IN =5V, V O=0V, V EN <VEL 1 µA PG Leakage Current ILC V PG=7V 1 µA EN Input Threshold EN Input Bias Current 0.5 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. 600mA CMOS LDO AME8861 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. 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 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 1µA. This pin behaves much like an electronic switch. 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 External Capacitors The AME8861 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. 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 ~ 0.01µF. 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. 600mA CMOS LDO AME8861 Ground Current vs. Input Voltage Load Step (1mA-600mA) Vo(10mV/DIV) 45 85 O C 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 1200 ILOAD=600mA 800 600 400 100m A C L =2.2µF T antalum C B Y P =0 -2 0 PSRR (dB) Drop Out Voltage (V) -1 0 1000 -3 0 -4 0 -5 0 10m A 100m A -6 0 200 -7 0 100 µ A 100 µA 1m A -8 0 0 1 2 3 4 5 10 6 1K 10M 100K Frequency (Hz) Output Voltage (V) Safe Operating Area Power Supply Rejection Ratio -2 0 100m A 650 400 PSRR (dB) Output Current (mA) -3 0 270 1m A -4 0 -5 0 100m A -6 0 -7 0 1.2 2 3 Input-Output Voltage Differential (V) 6 C L =2.2µF T antalum C B Y P =1000pF -8 0 10 10m A 100µA 100µA 1K 100K Frequency (Hz) 10M AME, Inc. 600mA CMOS LDO AME8861 Overtemperature Shutdown OUT Vo (1mV DIV) (200mA/DIV) Noise Measurement 0 R L O A D =6.6 Ω VOUT (1V/DIV) I C L =2.2µF N o Filter 0 TIM E (20m s/DIV) TIM E (0.5Sec/DIV) Short Circuit Response IOUT (200mV/DIV) C L O A D =2.2µF C IN =1.0µF R L O A D =3.3Ω V O U T N O M =3.3V TIM E (2m S/DIV) TIM E (2m S/DIV) C L =2µF R L =10Ω 0 0 VIN(1V/DIV) Line Transient Response VOUT (10mV/DIV) Output (1V/DIV) Enable (2V/DIV) Chip Enable Transient Response TIM E ( 1m S/DIV) C L O A D =2.2µF C IN =1µF R L O A D <100m Ω VOUT (1V/DIV) IOUT (200mA/DIV) VOUT (1V/DIV) Current Limit Response C L O A D =2.2µF 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. 600mA CMOS LDO AME8861 n Package Dimension SOT-25 Top View Side View SYMBOLS MIN E H L D £ c 1 S1 A 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 e è1 A A1 MAX 0.0472REF 0.15 S1 8 MIN 0.00 L Front View MAX 1.20REF INCHES A1 H e b MILLIMETERS 1.90 BSC 2.60 3.00 0.37BSC 0o 10o 0.95BSC 0.07480 BSC 0.10236 0.11811 0.0146BSC 0o 10 o 0.0374BSC 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 2003 Document: 2006-DS8861-D Corporate Headquarter U.S.A. (Subsidiary) AME, Inc. Analog Microelectronics, Inc. 2F, 189 Kang-Chien 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