Analog Microelectronics, Inc. AME8841 600mA CMOS LDO n General Description n Features The AME8841 linear regulator features low quiescent current (30µA typ.) with low dropout voltage, making it ideal for battery applications. The space-saving SO-8 package is attractive for "Pocket” and "Hand Held" applications. l These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. l l l l l l l l The AME8841 is stable with an output capacitance of 2.2µF or greater. l l l l l l l n Pin Configuration n Applications l l Very Low Dropout Voltage Guaranteed 600mA Output Accurate to within 1.5% 30µA Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Power-Saving Shutdown Mode Space-Saving SO-8 Package Many fixed output voltages available Low Temperature Coefficient Instrumentation Portable Electronics Wireless Devices Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales SO-8 Top View NC OUT IN GND AME 8841 EN NC NC OUT n Functional Block Diagram IN OUT n Typical Application Overcurrent Shutdown IN IN Thermal Shutdown AME8841 GND EN 5V OUT OUT EN C1 C3 1µF 2.2µF R1 AMP V ref =1.215V R2 GND 1 Analog Microelectronics, Inc. 600mA CMOS LDO AME8841 n Absolute Maximum Ratings: Parameter Maximum Unit 8 V PD / (VIN - VO) A GND - 0.3 to V IN + 0.3 V Input Voltage Output Current Input, Output Voltage ESD Classification B n Recomended Operating Conditions: Parameter Ambient Temperature Range Junction Temperature Rating Unit -40 to +85 o -40 to +125 o C C n Thermal Paramters Parameter Thermal Resistance (θja) Internal Power Dissipation (PD ) (∆ T = 100oC) Maximum 123.7 810 Unit o C/W mW Maximum Junction Temperature 150 o Maximum Lead Temperature ( 10 Sec) 300 o C C Caution: Stress above the listed absolute rating may cause permanent damage to the device 2 Analog Microelectronics, Inc. AME8841 600mA CMOS LDO n Ordering Information P art N um ber A M E 8841A E HA A M E 8841B E HA A M E 8841CE HA A M E 8841DE HA A M E 8841E E HA A M E 8841FE HA A M E 8841GE HA A M E 8841HE HA A M E 8841IE HA A M E 8841JE HA A M E 8841K E HA A M E 8841LE HA A M E 8841M E HA A M E 8841NE HA A M E 8841OE HA A M E 8841RE HA Marking 8841 A E HA y y ww 8841 B E HA y y ww 8841 CE HA y y ww 8841 DE HA y y ww 8841 E E HA y y ww 8841 FE HA y y ww 8841 GE HA y y ww 8841 HE HA y y ww 8841 IE HA y y ww 8841 JE HA y y ww 8841 K E HA y y ww 8841 LE HA y y ww 8841 M E HA y y ww 8841 NE HA y y ww 8841 OE HA y y ww 8841 RE HA y y ww Output P ackage Operating Temp. 3.3V S O-8 -40 O C to + 85 O C 3.0V S O-8 -40 O C to + 85 O C 2.8V S O-8 -40 O C to + 85 O C 2.5V S O-8 -40 O C to + 85 O C 3.8V S O-8 -40 O C to + 85 O C 3.6V S O-8 -40 O C to + 85 O C 3.5V S O-8 -40 O C to + 85 O C 2.7V S O-8 -40 O C to + 85 O C 3.4V S O-8 -40 O C to + 85 O C 2.85V S O-8 -40 O C to + 85 O C 3.7V S O-8 -40 O C to + 85 O C 1.5V S O-8 -40 O C to + 85 O C 1.8V S O-8 -40 O C to + 85 O C 2.9V S O-8 -40 O C to + 85 O C 3.1V S O-8 -40 O C to + 85 O C 2.65V S O-8 -40 O C to + 85 O C P lease c ons ult A M E s ales office or authorized Rep./Distributor for other output voltage and pac kage type availability . 3 Analog Microelectronics, Inc. 600mA CMOS LDO AME8841 n Electrical Specifications TA = 25 o C unless otherwise noted Parameter Symbol Input Voltage VIN Output Voltage Accuracy VO Dropout Voltage VDROPOUT Test Condition Min IO=1mA Typ Max Units Note 1 7 V -1.5 1.5 % 1.4V<VO(NOM)<=2.0V IO=600mA VO=VONOM -2.0% 1400 See chart 2.0V<VO(NOM)<=2.8V 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 30 50 µA 0.15 % 0.1 % Output Current Line Regulation REGLINE IO=5mA VIN=VO+1 to VO+2 VO < 2.0V -0.15 4.0V > VO >= 2.0V -0.1 VO >= 4.0V -0.4 mA 800 0.02 mA 0.4 % Over Temerature Shutdown OTS 150 o Over Temerature Hysterisis OTH 30 o VO Temperature Coefficient TC 30 Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Note1:VIN(min)=VOUT+VDROPOUT 4 800 PSRR eN f=1kHz 50 f=10kHz 20 f=100kHz 15 Co=2.2µF 30 IO=100mA CO=2.2µF f=10Hz to 100kHz IO=10mA,CBYP=0µF C C ppm/oC dB mVrms VEH VIN=2.7V to 7V 2.0 Vin V VEL VIN=2.7V to 7V 0 0.4 V IEH VEN=VIN, VIN=2.7V to 7V 0.1 µA IEL VEN=0V, VIN=2.7V to 7V 0.5 µA ISD VIN=5V, VO=0V, VEN<VEL 1 µA 0.5 Analog Microelectronics, Inc. AME8841 600mA CMOS LDO n Detailed Description n Enable The AME8841 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. 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 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 110oC. The AME8841 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8841 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 AME8841 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. 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 Analog Microelectronics, Inc. 600mA CMOS LDO AME8841 Load Step ( 1mA-600mA) Ground Current vs. Input Voltage Vo(10mV/DIV) 45 35 85 O C 30 25 Output C L =2.2µF CIN=2.2µF 25 O C 20 IL(200mA/DIV) µA) Ground Current (µ 40 15 10 5 0 0 1 2 3 4 5 6 7 IL o a d 0 8 TIME ( 20mS/DIV) Input Voltage (V) Drop Out Voltage vs. Output Voltage Power Supply Rejection Ratio 0 -10 0.25 IL O A D= 6 0 0 m A -20 0.2 PSRR (dB) Drop Out Voltage (V) 0.3 0.15 0.1 -30 -40 -50 10mA 100mA -70 0 2 2.5 3 3.5 4 4.5 5 5.5 Output Voltage (V) 600 8807AEHA 8841AEHA 100 10 0.1 -80 1.0E+01 100 µA 1.0E+03 100 µA 1.0E+05 Frequency (Hz) Safe Operating Area Output Current (mA) 100mA -60 0.05 1.0 Input-Output Voltage Differential (V) 6 C L =2.2 µF Tantalum C B Y P =0 8.0 1mA 1.0E+07 Analog Microelectronics, Inc. AME8841 600mA CMOS LDO Noise Measurement (200mA/DIV) Overtemperature Shutdown OUT 0 R LOAD =6.6Ω VOUT (1V/DIV) I Vo (1mV/ DIV) CL = 2.2µF NO FILTER 0 TIME (0.5Sec/DIV) TIME (20mS/DIV) I OUT (200mV/DIV) Short Circuit Response C L O A D =2.2µF C I N =1.0µF R L O A D =3.3Ω V O U T N O M =3.3V TIME (2mS/DIV) TIME (2mS/DIV) Line Transient Response 0 VIN(1V/DIV) 0 VOUT (10mV/DIV) C L =2µF R L =10Ω Output (1V/DIV) Enable (2V/DIV) Chip Enable Transient Response TIME ( 1mS/DIV) C L O A D =2.2µF C IN = 1µF R L O A D < 1 0 0 mΩ V OUT (1V/DIV) IOUT (200mA/DIV) VOUT (1V/DIV) Current Limit Response C L O A D =2.2µF IL O A D = 1 m A V O U T D C =3.3V V I N D C =4.5V TIME (200mS/DIV) 7 Analog Microelectronics, Inc. 600mA CMOS LDO AME8841 EN pin vs. Temp. Quiescent Current vs.Temp. -0.20 EN pin LO bias current (uA) Quiescent Current (uA) 40 38 36 34 32 30 28 26 -20 0 20 40 60 Temperature (0C) -0.25 -0.30 -0.35 -0.40 -0.45 -0.50 80 -20 20 80 Dropout Voltage @ 600mA (mV) 500 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -20 0 20 40 60 480 460 440 420 400 380 360 -20 80 0 Temperature (0C) 20 40 60 80 Tem perature (0C) Vout vs. Temp. Load Regulation vs. Temp. 2.660 0.55 2.655 Load Regulation (%) Vout @ Vin=Vout+2V (V) 60 Dropout Voltage vs. Temp. 0.65 2.650 2.645 2.640 2.635 2.630 0.50 0.45 0.40 0.35 2.625 2.620 -20 0 20 40 60 0 Temperature ( C) 8 40 Tem perature (0C) Shut Down Current vs. Temp. Shut Down Current (uA) 0 80 0.30 -20 0 20 40 Tem perature (0C) 60 80 Analog Microelectronics, Inc. AME8841 600mA CMOS LDO n Package Dimension SO-8 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 INCHES MIN MAX 0.053 0.069 0.004 0.010 — 0.33 — 0.51 — 0.013 — 0.020 C D E 0.19 4.80 3.80 0.25 5.00 4.00 0.007 0.189 0.150 0.010 0.1970 0.157 e — 5.80 0.40 — 6.20 1.27 0.10 — 0.228 0.016 — 0.244 0.050 0.004 SYMBOLS A A1 A2 B θ H L y θ — ° 0 ° 8 ° 0 ° 8 9 www.analogmicro.com E-Mail: [email protected] Life Support Policy: These products of Analog Microelectronics, Inc. are not authorized for use as critical components in lifesupport devices or systems, without the express written approval of the president of Analog Microelectronics, Inc. Analog Microelectronics, 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. Analog Microelectronics, Inc. , August 2001 Document: 2006-DS8841-C Corporate Headquarters Asia Pacific Headquarters Analog Microelectronics, Inc. AME, Inc. 3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 2F, NO. 187 Kang-Chien Road, Nei-Hu Dist., Taipei 114, Taiwan, R.O.C. Tel : (408) 988-2388 Fax: (408) 988-2489 Tel : 886 2 2627-8687 Fax : 886 2 2659-2989