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AME, Inc. AME8844 750mA CMOS LDO 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. Output voltages are set at the factory and trimmed to 1.5% accuracy. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. The AME8844 is stable with an output capacitance of 4.7F or greater. n Functional Block Diagram (Fixed Versions) IN Overcurrent Shutdown OUT Thermal Shutdown EN Vref x115% PG R1 AMP 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. GND n Functional Block Diagram (Adjustable Version) IN OUT Overcurrent Shutdown Thermal Shutdown AMP R1 EN ADJ (external) 1.242V R2 (external) GND n Typical Applications IN IN OUT n Applications l l l l l Instrumentation Portable Electronics Wireless Devices PC Peripherals Battery Powered Widgets OUT AME8844 PG GND EN C1 5V 1F C3 4.7F 1 AME, Inc. AME8844 750mA CMOS LDO n Pin Configuration MSOP-8 Top View 8 7 6 5 MSOP-8 Top View AME 8844AEQAxxx 1. EN 2. VIN 3. 4. 5. 6. 7. 8. PG VOUT GND GND GND GND 8 7 6 5 8844 Xyww 8844 Byww 1 2 3 4 1 2 3 4 AME 8844BEQAADJ 1. EN 2. VIN 3. ADJ 4. VOUT 5. GND 6. GND 7. GND 8. GND Note: X: represents the regulator output voltage. yww: represents the date code. Please contact AME for details. n Ordering Information AME8844 AEQA xxx Voltage 150: V=1.5V 180: V=1.8V 250: V=2.5V 330: V=3.3V Pin Out Types [Package Type] Q:MSOP-8 [Pin Count] A:8 AME8844 BEQA ADJ Voltage ADJ: Adjustable Pin Out Types [Package Type] Q:MSOP-8 [Pin Count] A:8 Operating Temperature E:-40oC to 85oC Operating Temperature E:-40oC to 85oC 2 AME, Inc. AME8844 750mA CMOS LDO n Ordering Information (contd.) Part Number AME8844AEQA150 Marking 8844 Lyww 8844 Myww 8844 Dyww 8844 Ayww 8844 Byww Output Voltage 1.50 Package MSOP-8 Operating Temp. Range - 40oC to + 85oC AME8844AEQA180 1.80 MSOP-8 - 40oC to + 85oC AME8844AEQA250 2.50 MSOP-8 - 40oC to + 85oC AME8844AEQA330 3.30 MSOP-8 - 40oC to + 85oC AME8844BEQAADJ 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. AME8844 750mA CMOS LDO n Absolute Maximum Ratings Parameter Input Voltage Output Current Output Voltage ESD Classification Maximum 8 Unit V mA V PD / (VIN - VO) GND - 0.3 to V IN + 0.3 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 - 40 to + 85 - 40 to + 125 Unit o C C o n Thermal Information Parameter Thermal Resistance (jc ) Internal Power Dissipation (PD ) ( T = 100oC)* Maximum Junction Temperature Maximum Lead Temperature (10 Sec) MSOP-8 MSOP-8 150 300 Maximum 80 Unit o C/W W o C C o * Assuming a heat sink capable of twice times (jc) ** Estimated 4 AME, Inc. AME8844 750mA CMOS LDO n Electrical Specifications VIN = VO(NOM) +2V, VEN = VIN, TA = 25OC unless otherwise noted Parameter Input Voltage Output Voltage Accuracy Dropout Voltage Output Current Current Limit Short Circuit Current Quiescent Current Ground Pin Current Line Regulation Load Regulation Over Temerature Shutdown Over Temerature Hysterisis V O Temperature Coefficient ADJ Input Bias Current Minimum Load Current ADJ Reference Voltage Power Supply Rejection Symbol VIN VO VDROPOUT IO ILIM ISC IQ IGND REGLINE REGLOAD OTS OTH TC IADJ Iload V REF PSRR IO=100mA CO=4.7F ceramic f=10Hz to 100kHz IO=10mA IO=750mA Test Condition IO=1mA 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 Min Note 1 -1.5 Typ Max Units V % mV mA mA mA A A % % % % C C ppm/ oC A A V o o 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 Vin = 2.5V f=1kHz f=10kHz f=100kHz Co=4.7F 70 1.221 1.240 1.26 75 55 30 30 2.0 0 dB 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 eN VEH V EL IEH IEL ISD VUV VOV ILC Vrms Vin V 0.4 V 1 A 1 A 2 A 84 %V O(NOM) %V O(NOM) 1 A 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 0.5 105 V OL ISINK=0.25mA 0.4 V Note1:VIN(min)=VOUT+VDROPOUT 5 AME, Inc. AME8844 750mA CMOS LDO n Detailed Description The AME8844 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 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 Enable 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. 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: 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. 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. AME8844 Dropout Voltage VS ILOAD 1 .2 1 1 750mA CMOS LDO Dropout Voltage VS VOUT I L O A D =1.5A 0 .8 V O U T =1.5 Dropout Voltage (V) Dropout Voltage (V) 0 .8 1.8 2.0 0 .6 0 .6 2.1 0 .4 I L O A D =1.0A 0 .4 2.8 3.3 I L O A D =0.5A 0 .2 0 .2 0 0 0 .3 0 .6 0 .9 1 .2 1 .5 1 .8 0 0 2 4 6 8 I LO AD (A) V O U T (V) Quiescent Current vs. Temperature 50 41 Ground Current vs. VIN Quiescent Current @ 5V (uA) 39 37 35 33 31 29 27 25 -4 5 -5 25 55 o 45 Ground Current (A) 40 35 30 25 20 15 10 IOUT = 140mA VOUT = 1.5V 85 115 2 3 4 5 6 7 8 Tem perature ( C) VIN (V) Ground Current vs. Load Current 38.5 38 2 .5 0 0 VOUT vs. Temperature(2.5V) Ground Current (A) 37 36.5 36 35.5 35 34.5 0 0.25 0.5 0.75 VIN = 2.5V VOUT = 1.5V Output Voltage (V) 37.5 2 .4 9 5 2 .4 9 0 2 .4 8 5 2 .4 8 0 1 1.25 1.5 2 .4 7 5 -4 5 -5 25 55 85 115 Load Current (mA) Tem perature ( o C) 7 AME, Inc. AME8844 Load Regulation vs. Temperature 0 .3 0 750mA CMOS LDO Dropout Voltage vs. Load Current(2.5V) 400 0 .2 5 Dropout Voltage @1.5A (mV) 350 300 250 200 150 100 50 0 Load Regulation (%) 115 oC 85 oC 55 oC 25 oC -5 oC -45 oC 0 .2 0 0 .1 5 0 .1 0 0 .0 5 0 .0 0 -4 5 -5 25 55 85 115 0.3 0.6 0.9 1.2 1.5 Temperature ( o C) Load Current (A) AME8844BEQA VADJ vs. Temperature 1 .2 4 4 1 .2 4 3 1 .2 4 2 Line Transient Response VOUT (50mV/DIV) VADJ (V) 1 .2 4 1 1 .2 4 0 1 .2 3 9 1 .2 3 8 1 .2 3 7 1 .2 3 6 1 .2 3 5 VIN (2V/DIV) C IN = 4.7F C O U T = 4.7F T R = T F = 1S V O U T = 1.5V -4 5 -5 25 55 85 115 0 Tim e (20m S/DIV) Tem perature ( o C) Load Step 40mA to 1.5A ILoad 1A/DIV VOUT 1V/DIV Current Limit Response V IN = 5V C IN = 4.7F C O U T = 4.7F 0 C IN = 4.7F C O U T = 4.7F V IN = 4.0V V O U T = 1.8V VOUT 10mV/DIV 0V ILOAD 1A/DIV I L IM IS C 0A Tim e 500 S/DIV Tim e 1m S/DIV 8 AME, Inc. AME8844 Current Limit vs. VIN 3 2 .8 2 .6 1 .6 750mA CMOS LDO Short Circuit Current vs. VIN Short Circuit Current (A) 1 .4 1 .2 1 0 .8 0 .6 0 .4 0 .2 0 Current Limit (A) 2 .4 2 .2 2 1 .8 1 .6 1 .4 1 .2 1 2 C IN = 4.7F C O U T = 4.7F V O U T = 1.8V C IN = 4.7F C O U T = 4.7F 3 4 5 6 7 8 2 3 4 5 6 7 8 V IN (V) V IN (V) Overtemperature Shutdown 10000 Stability vs. ESR vs. ILoad U nstable R egion 1000 IOUT 1A/DIV 0A CLESR ( ) V IN = 4V C IN = 4.7F C O U T = 4.7F 100 C L =5F 10 VOUT 1V/DIV 1 S table R egion 0V 0 .1 0 .0 1 0 250 U ntested R egion 500 750 1000 1250 1500 Tim e 100m S/DIV ILO AD (m A) Stability vs. ESR vs. ILoad 10000 10000 Stability vs. ESR vs. ILoad U nstable R egion 1000 100 U nstable R egion 1000 100 C L =2F CLESR ( ) CLESR ( ) C L =10F 10 1 0 .1 0 .0 1 10 1 S table R egion S table R egion 0 .1 0 .0 1 0 250 500 U ntested R egion 750 1000 1250 1500 0 .0 0 1 0 U ntested R egion 250 500 750 1000 1250 1500 ILO AD (m A) ILO AD (m A) 9 AME, Inc. AME8844 750mA CMOS LDO n External Resistor Divider Table R1 (K Ohm) 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 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 1 2 5 10 20 R2(kohm)=(1.24*R1(kohm))/(Vout-1.24) 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 10 AME, Inc. AME8844 750mA CMOS LDO n External Resistor Divider Table (contd.) R1 (K Ohm) 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 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 2 5 10 20 R2(kohm)=(1.242*R1(kohm))/(Vout-1.242) 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. AME8844 750mA CMOS LDO n Package Dimension MSOP-8 Top View D e1 TOP PKG. SYMBOLS DETAIL A MILLIMETERS MIN MAX 1.07 0.20 0.92 0.38 0.33 0.23 0.17 3.10 4.98 3.10 INCHES MIN 0.002 0.032 0.011 0.011 0.005 0.005 0.114 0.188 0.114 MAX 0.04197 0.008 0.036 0.015 0.013 0.009 0.006 0.122 0.196 0.122 A A1 A2 b b1 c c1 D E E1 e e1 L 0.05 0.81 0.28 0.28 0.13 0.13 2.90 4.77 2.90 BTM PKG. E1 E L2 L L1 c PIN 1 I.D (SHINNY SURFACE) 0.65 TYP 1.95 TYP 0.406 0.686 0.0255 TYP 0.0767 TYP 0.01598 0.02701 0.037 REF 0.010 TYP o Front View R0.127(0.005) TYP ALL CORNER & EDGES L1 L2 e 0.94 REF 0.254 TYP 0 o A A2 A1 e b 8 0o 8o End View SECTION B-B b b1 BASE METAL B B E1 See Detail A c c1 WITH PLATING 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. 12 AME, Inc. AME8844 750mA CMOS LDO n Tape and Reel Diagram PIN 1 W P Carrier Tape, Number of Components Per Reel and Reel Size Package MSOP-8L Carrier Width (W) 12mm Pitch (P) 9.1mm Part Per Full Reel 4000 Reel Size 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. (c) AME, Inc. , July 2003 Document: 2013-DS8844-E Corporate Headquarter AME, Inc. 2F, 189 Kang-Chien Road, Nei-Hu Dist. 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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