AME, Inc. 750mA CMOS LDO AME8844 n General Description The AME8844 family of positive, linear regulators feature low quiescent current (45A typ.) with low dropout voltage, making them ideal for battery applications. n Functional Block Diagram (Fixed Versions) OUT IN Overcurrent Shutdown Output voltages are set at the factory and trimmed to 1.5% accuracy. Thermal Shutdown These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. EN R1 Vref x115% An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. AMP PG The AME8844 is stable with an output capacitance of 4.7F or greater. R2 Vref x85% Vref n Features l l l l l l l l l l l l l l Very Low Dropout Voltage Guaranteed 750mA Output Accurate to within 1.5% 45A Quiescent Current Typically Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Noise Reduction Bypass Capacitor (Fixed Versions) Power-Saving Shutdown Mode Space-Saving MSOP-8 Package 6 Factory Pre-set Output Voltages Low Temperature Coefficient Adjustable Version Power Good Output Function. n Applications l l l l l Instrumentation Portable Electronics Wireless Devices PC Peripherals Battery Powered Widgets GND n Functional Block Diagram (Adjustable Version) IN OUT Overcurrent Shutdown Thermal Shutdown R1 AMP EN (external) ADJ 1.242V R2 (external) GND n Typical Applications IN IN OUT OUT AME8844 PG 5V GND EN C1 C3 1 F 4.7 F 1 AME, Inc. 750mA CMOS LDO AME8844 n Pin Configuration MSOP-8 Top View 8 7 6 MSOP-8 Top View AME 8844AEQAxxx 1. EN 2. VIN 5 3. 4. 5. 6. 7. 8. 8844 Xyww 1 2 3 4 PG VOUT GND GND GND GND 8 7 6 AME 8844BEQAADJ 1. EN 2. VIN 3. ADJ 4. VOUT 5. GND 6. GND 7. GND 8. GND 5 8844 Byww 1 2 3 4 Note: X: represents the regulator output voltage. yww: represents the date code. Please contact AME for details. n Ordering Information AME8844 AEQA xxx 2 AME8844 BEQA ADJ Voltage 150: V=1.5V 180: V=1.8V 250: V=2.5V 330: V=3.3V Voltage ADJ: Adjustable Pin Out Types [Package Type] Q:MSOP-8 [Pin Count] A:8 Pin Out Types [Package Type] Q:MSOP-8 [Pin Count] A:8 Operating Temperature E:-40oC to 85oC Operating Temperature E:-40oC to 85oC AME, Inc. 750mA CMOS LDO AME8844 n Ordering Information (contd.) Part Number Marking Output Voltage Package Operating Temp. Range AME8844AEQA150 8844 Lyww 1.50 MSOP-8 - 40oC to + 85oC AME8844AEQA180 8844 Myww 1.80 MSOP-8 - 40oC to + 85oC AME8844AEQA250 8844 Dyww 2.50 MSOP-8 - 40oC to + 85oC AME8844AEQA330 8844 Ayww 3.30 MSOP-8 - 40oC to + 85oC AME8844BEQAADJ 8844 Byww ADJ MSOP-8 - 40oC to + 85oC Note: ww represents the date code Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability. 3 AME, Inc. 750mA CMOS LDO AME8844 n Absolute Maximum Ratings Parameter Maximum Unit 8 V Output Current PD / (VIN - VO) mA Output Voltage GND - 0.3 to V IN + 0.3 V Input Voltage ESD Classification B Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device n Recommended Operating Conditions Parameter Rating Ambient Temperature Range Junction Temperature Unit - 40 to + 85 o C - 40 to + 125 o C n Thermal Information Parameter Thermal Resistance (jc ) Internal Power Dissipation (PD ) ( T = 100oC)* Maximum MSOP-8 MSOP-8 o C/W W Maximum Junction Temperature 150 o Maximum Lead Temperature (10 Sec) 300 o * Assuming a heat sink capable of twice times (jc) ** Estimated 4 80 Unit C C AME, Inc. 750mA CMOS LDO AME8844 n Electrical Specifications VIN = VO(NOM) +2V, VEN = VIN, TA = 25OC unless otherwise noted Parameter Symbol Input Voltage Output Voltage Accuracy VIN VO Dropout Voltage Output Current Current Limit Short Circuit Current Quiescent Current Ground Pin Current VDROPOUT IO ILIM ISC IQ IGND Line Regulation REGLINE Load Regulation Over Temerature Shutdown Over Temerature Hysterisis V O Temperature Coefficient ADJ Input Bias Current Minimum Load Current ADJ Reference Voltage REGLOAD OTS OTH TC Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Output Under Voltage Output Over Voltage PG Leakage Current PG Voltage Low Test Condition Min IO=1mA Note 1 -1.5 VO(NOM)=1.5V VO(NOM)=1.8V VO=VONOM -2.0% VO(NOM)>=2.0V VO>1.2V VO>1.2V VIN =VO(NOM) +1V, V O < 0.4V IO=0mA IO=1mA to 750mA V O < 2.0V IO=1mA 4.0 > VO >= 2.0V V IN =VO+1 to VO+2 4.0V <= VO IO=1mA to 750mA IO=750mA IADJ Iload V REF PSRR eN VEH V EL IEH IEL ISD VUV VOV Vin = 2.5V IO=100mA CO=4.7F ceramic f=10Hz to 100kHz IO=10mA f=1kHz f=10kHz f=100kHz Max 7 1.5 1000 See 650 chart 500 750 750 750 45 45 -0.15 -0.1 -0.4 -1 0.02 0.2 150 30 30 1 70 0.15 0.1 0.4 1 0.5 105 V % mV mA mA mA A A % % % % C C ppm/ oC A A V o dB Vrms 30 2.0 0 Units o 70 1.221 1.240 1.26 75 55 30 Co=4.7F V IN =2.7V to 7V V IN =2.7V to 7V VEN =VIN , V IN =2.7V to 7V VEN =0V, VIN =2.7V to 7V VIN =5V, VO=0V, VEN <VEL PG goes Low when V OUT too Low PG goes Low when VOUT too High Typ Vin V 0.4 V 1 A 1 A 2 A 84 %V O(NOM) %V O(NOM) ILC VPG=7V 1 A V OL ISINK=0.25mA 0.4 V Note1:VIN(min)=VOUT+VDROPOUT 5 AME, Inc. 750mA CMOS LDO AME8844 n Detailed Description n Enable The AME8844 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 2A. 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 140oC, or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The AME8844 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75 ohms. n External Capacitors The AME8844 is stable with an output capacitor to ground of 4.7F 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. 100K Ohm resistor is necessary between VEN source and EN pin when VEN is higher than VIN. (Note: There is no internal pull-up for EN pin. It can not be floating) n Adjustable Version The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.24V and VOUT is given by the equation: VOUT = Vadj ( 1 + R1 / R2 ) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1 + R2 will reduce stability. In general, R1 and R2 in the 10's of k will produce adequate stability, given reasonable layout precautions. To improve stability characteristics, keep parasitics on the ADJ pin to a minimum, and lower R1 and R2 values. n Power Good The AME8844 includes the Power Good feature. When the output is not within 15% of the specified voltage, it pulls low. This can occur under the following conditions: 1) 2) 3) 4) Input Voltage too low. During Over-Temperature. During Over-Current. If output is pulled up. (Note: PG pin is an open-drain output.) 6 AME, Inc. 750mA CMOS LDO AME8844 Dropout Voltage VS ILOAD Dropout Voltage VS VOUT 1 1 .2 0 .8 Dropout Voltage (V) Dropout Voltage (V) I L O A D =1.5A V O U T =1.5 1 1.8 0 .8 2.0 0 .6 2.1 0 .4 2.8 0 .2 3.3 0 .6 I L O A D =1.0A 0 .4 I L O A D =0.5A 0 .2 0 0 0 0 .3 0 .6 0 .9 1 .2 1 .5 0 1 .8 2 4 6 8 V O U T (V) I LO AD (A) Quiescent Current vs. Temperature Ground Current vs. VIN 50 45 39 Ground Current ( A) Quiescent Current @ 5V (uA) 41 37 35 33 31 29 40 35 IOUT = 140mA VOUT = 1.5V 30 25 20 15 27 10 25 -4 5 -5 25 55 85 2 115 3 4 5 6 7 8 VIN (V) o Tem perature ( C) Ground Current vs. Load Current VOUT vs. Temperature(2.5V) 38.5 2 .5 0 0 2 .4 9 5 37.5 Output Voltage (V) Ground Current ( A) 38 VIN = 2.5V VOUT = 1.5V 37 36.5 36 35.5 2 .4 9 0 2 .4 8 5 2 .4 8 0 35 34.5 0 0.25 0.5 0.75 1 Load Current (mA) 1.25 1.5 2 .4 7 5 -4 5 -5 25 55 85 115 Tem perature ( o C) 7 AME, Inc. 750mA CMOS LDO AME8844 Load Regulation vs. Temperature Dropout Voltage vs. Load Current(2.5V) 400 Dropout Voltage @1.5A (mV) 0 .3 0 Load Regulation (%) 0 .2 5 0 .2 0 0 .1 5 0 .1 0 0 .0 5 0 .0 0 -4 5 115 oC 85 oC 55 oC 350 300 25 oC 250 -5 oC -45 oC 200 150 100 50 0 -5 25 55 85 115 0.3 0.6 0.9 1.2 1.5 Load Current (A) Temperature ( o C) Line Transient Response AME8844BEQA VADJ vs. Temperature VOUT (50mV/DIV) 1 .2 4 4 1 .2 4 3 1 .2 4 1 1 .2 4 0 1 .2 3 9 VIN (2V/DIV) VADJ (V) 1 .2 4 2 1 .2 3 8 1 .2 3 7 1 .2 3 6 1 .2 3 5 -4 5 -5 25 55 85 0 115 Tim e (20m S/DIV) Tem perature ( o C) V IN = 5V C IN = 4.7F C O U T = 4.7F VOUT 1V/DIV 0 Tim e 500 S/DIV 8 Current Limit Response 0V ILOAD 1A/DIV VOUT 10mV/DIV ILoad 1A/DIV Load Step 40mA to 1.5A C IN = 4.7F C O U T = 4.7F V IN = 4.0V V O U T = 1.8V C IN = 4.7F C O U T = 4.7F T R = T F = 1S V O U T = 1.5V I L IM IS C 0A Tim e 1m S/DIV AME, Inc. 750mA CMOS LDO AME8844 Current Limit vs. VIN Short Circuit Current vs. VIN 1 .6 3 2 .8 Current Limit (A) 2 .4 1 .4 Short Circuit Current (A) C IN = 4.7F C O U T = 4.7F V O U T = 1.8V 2 .6 2 .2 2 1 .8 1 .6 1 .4 C IN = 4.7F C O U T = 4.7F 1 .2 1 0 .8 0 .6 0 .4 0 .2 1 .2 0 1 2 3 4 5 6 7 2 8 3 4 5 6 7 8 V IN (V) V IN (V) Overtemperature Shutdown Stability vs. ESR vs. ILoad 10000 IOUT 1A/DIV U nstable R egion 1000 CLESR ( ) VOUT 1V/DIV V IN = 4V C IN = 4.7F C O U T = 4.7F C L =5F 100 0A 10 1 S table R egion 0 .1 0V U ntested R egion 0 .0 1 0 250 500 750 Stability vs. ESR vs. ILoad 1250 1500 Stability vs. ESR vs. ILoad 10000 10000 U nstable R egion U nstable R egion 1000 1000 100 C L =2F C L =10F CLESR ( ) 100 CLESR ( ) 1000 ILO AD (m A) Tim e 100m S/DIV 10 1 S table R egion 0 .1 10 1 S table R egion 0 .1 0 .0 1 U ntested R egion 0 .0 1 0 250 500 750 1000 ILO AD (m A) 1250 1500 0 .0 0 1 0 U ntested R egion 250 500 750 1000 1250 1500 ILO AD (m A) 9 AME, Inc. 750mA CMOS LDO AME8844 n External Resistor Divider Table R1 (K Ohm) 1 10 5 10 20 R2(kohm)=(1.24*R1(kohm))/(Vout-1.24) Vout 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 2 20.67 11.27 7.75 5.90 4.77 4.00 3.44 3.02 2.70 2.43 2.21 2.03 1.88 1.75 1.63 1.53 1.44 1.36 1.29 1.23 1.17 1.12 1.07 1.02 0.98 0.95 0.91 0.88 0.85 0.82 0.79 0.77 0.75 0.73 0.70 0.69 0.67 41.33 22.55 15.50 11.81 9.54 8.00 6.89 6.05 5.39 4.86 4.43 4.07 3.76 3.49 3.26 3.06 2.88 2.73 2.58 2.46 2.34 2.23 2.14 2.05 1.97 1.89 1.82 1.76 1.70 1.64 1.59 1.54 1.49 1.45 1.41 1.37 1.33 103.33 56.36 38.75 29.52 23.85 20.00 17.22 15.12 13.48 12.16 11.07 10.16 9.39 8.73 8.16 7.65 7.21 6.81 6.46 6.14 5.85 5.59 5.34 5.12 4.92 4.73 4.56 4.40 4.25 4.11 3.97 3.85 3.73 3.63 3.52 3.43 3.33 206.67 112.73 77.50 59.05 47.69 40.00 34.44 30.24 26.96 24.31 22.14 20.33 18.79 17.46 16.32 15.31 14.42 13.63 12.92 12.28 11.70 11.17 10.69 10.25 9.84 9.47 9.12 8.79 8.49 8.21 7.95 7.70 7.47 7.25 7.05 6.85 6.67 413.33 225.45 155.00 118.10 95.38 80.00 68.89 60.49 53.91 48.63 44.29 40.66 37.58 34.93 32.63 30.62 28.84 27.25 25.83 24.55 23.40 22.34 21.38 20.50 19.68 18.93 18.24 17.59 16.99 16.42 15.90 15.40 14.94 14.50 14.09 13.70 13.33 AME, Inc. 750mA CMOS LDO AME8844 n External Resistor Divider Table (contd.) R1 (K Ohm) 1 5 10 20 R2(kohm)=(1.242*R1(kohm))/(Vout-1.242) Vout 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 2 0.65 0.63 0.62 0.60 0.59 0.57 0.56 0.55 0.54 0.53 0.51 0.50 0.49 0.48 0.48 0.47 0.46 0.45 0.44 0.43 0.43 0.42 0.41 0.41 0.40 0.39 0.39 0.38 0.37 0.37 0.36 0.36 0.35 0.35 0.34 0.34 0.33 0.33 1.30 1.27 1.23 1.20 1.18 1.15 1.12 1.10 1.07 1.05 1.03 1.01 0.99 0.97 0.95 0.93 0.92 0.90 0.88 0.87 0.85 0.84 0.82 0.81 0.80 0.78 0.77 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68 0.67 0.66 3.25 3.16 3.08 3.01 2.94 2.87 2.81 2.74 2.68 2.63 2.57 2.52 2.47 2.42 2.38 2.33 2.29 2.25 2.21 2.17 2.13 2.09 2.06 2.03 1.99 1.96 1.93 1.90 1.87 1.85 1.82 1.79 1.77 1.74 1.72 1.69 1.67 1.65 6.49 6.33 6.17 6.02 5.88 5.74 5.61 5.49 5.37 5.25 5.15 5.04 4.94 4.84 4.75 4.66 4.58 4.49 4.41 4.34 4.26 4.19 4.12 4.05 3.99 3.92 3.86 3.80 3.75 3.69 3.64 3.58 3.53 3.48 3.43 3.39 3.34 3.30 12.98 12.65 12.34 12.04 11.75 11.48 11.22 10.97 10.74 10.51 10.29 10.08 9.88 9.69 9.50 9.32 9.15 8.99 8.83 8.67 8.52 8.38 8.24 8.10 7.97 7.85 7.73 7.61 7.49 7.38 7.27 7.17 7.07 6.97 6.87 6.78 6.68 6.60 Note: Small load(greater than 2 mA) is necessary as R1 or R2 is larger than 50 K Ohm. Otherwise, outputvoltage probably cannot be pulled down to 0 V on disable mode. 11 AME, Inc. 750mA CMOS LDO AME8844 n Package Dimension MSOP-8 SYMBOLS Top View DETAIL A D e1 TOP PKG. BTM PKG. E1 L2 E c L L1 PIN 1 I.D (SHINNY SURFACE) Front View A MAX MIN MAX A - 1.07 - 0.04197 A1 0.05 0.20 0.002 0.008 A2 0.81 0.92 0.032 0.036 b 0.28 0.38 0.011 0.015 b1 0.28 0.33 0.011 0.013 c 0.13 0.23 0.005 0.009 c1 0.13 0.17 0.005 0.006 D 2.90 3.10 0.114 0.122 E 4.77 4.98 0.188 0.196 E1 2.90 3.10 0.114 0.122 e 0.65 TYP 0.0255 TYP e1 1.95 TYP 0.0767 TYP A1 e b End View SECTION B-B b b1 BASE METAL B c B E1 See Detail A 12 c1 WITH PLATING 0.406 0.686 L1 0.94 REF L2 0.254 TYP e A2 INCHES MIN L R0.127(0.005) TYP ALL CORNER & EDGES MILLIMETERS 0 o 8 0.01598 0.02701 0.037 REF 0.010 TYP o 0o 8o NOTE: 1. Controlling dimension : Millimeter, converted inchdimension are not necessarily exact. 2. Dimensiioning and tolerancing per ansi Y14.5m-1994. 3. Dimension "d" does not include mold flash,protrusion or gate burr, mold flash,protrusion and gate burr shall not exceed 0.15mm(0.006") per side. Dimension e1 do not include inter-lead flash or protrusion, inter-lead flash and protrusion shall not exceed 0.15mm(0.006") per side. 4. The package top be smaller than the package bottom. Dimension d and e1 are determined at outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. Dimension 'b' does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm(0.0031) total in excess of the "b" dimension at maximum material condition. AME, Inc. 750mA CMOS LDO AME8844 n Tape and Reel Diagram PIN 1 W P Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size MSOP-8L 12mm 9.1mm 4000 13in 13 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. AME, Inc. , July 2003 Document: 2013-DS8844-E Corporate Headquarter AME, Inc. U.S.A. (Subsidiary) Analog Microelectronics, Inc. 2F, 189 Kang-Chien Road, Nei-Hu Dist. 3100 De La Cruz Blvd. Suite 201 Taipei 114 Taiwan, R.O.C. Tel: 886 2 2627-8687 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: 886 2 2659-2989 Fax: (408) 988-2489