Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Feature General Description 0.7V maximum dropout voltage at 3A load current Built-in Thermal shutdown * Output current limiting * Adjustable or fixed output voltage 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V * Fast transient response * Good noise rejection * Packages: TO252-5L, TO220-5L and TO263-5L RoHS Compliant APE1185 is a 3A regulator with extremely low dropout voltage. This product is specifically designed to provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies where high efficiency of the switch can be achieved without the cost and complexity associated with switching regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply. * * Ordering Information APE1185 X - XX Package Low Dropout Regulator Vout H:TO252-5L S:TO263-5L P:TO220-5L Blank : Adj 12 = 1.2V 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V Typical Application 5V 10uF Vctr1 3.3V Vin 2.5V/3A VOUT GND Vsense 470uF 470uF This datasheet contains new product information. Advanced Power Electronics Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. 200926071-1/7 Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Block Diagram Vin Vout Vsense Vctrl + + - CURRENT LIMIT 1.25V (1.2V) + + - THERMAL SHUTDOWN Adj Pin Configuration FRONT VIEW FRONT VIEW 5 4 3 2 1 Vin Vctrl Vout Adj(GND) Vsense 4 Vctrl Metal Tab GND 3 Vout 2 Adj(GND) 1 Vsense Tab is Vout Tab is Vout ( APE1185H ) (APE1185S) FRONT VIEW 5 Vin 5 4 3 2 1 Vin Vctrl Vout Adj(GND) Vsense Tab is Vout (APE1185P) Pin Descriptions Name Adj (GND) I/O Vsense I Vin I Vctrl I Vout O Description A resistor divider from this pin to the Vout pin and ground sets the output voltage. (GND only for fixed mode) This pin is the positive side of the reference that allows remote load sensing to achieve excellent load regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. The input of the regulator. Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be higher than Vout in order for the device to regulate. This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. This pin must always by higher than the Vout pin in order the device to regulate. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability. The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability. 2/7 Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Absolute Maximum Ratings Symbol Parameter Rating Unit VIN Input Voltage 16 V Vctrl Control Input voltage 18 V PD Power dissipation TST Storage temperature Range TOP Internally limited Operation Junction Temperature Range -65 to +150 o C 0 to +150 o C Electrical Characteristics o o Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150 C. Typical value refer to Tj=25 C. Vout=Vsense. Sym. Parameter VREF Reference Voltage Line Regulation Vout Output Voltage Load Regulation Dropout Voltage (Vctrl -Vout) Dropout Voltage (Vin -Vout) Current Limit Minimum Load Current Test Condition o Io=10mA, Tj=25 C, (Vin-Vout)=0.7V, APE1185-Adj Vctrl=VIN+1V o I =10mA, VOUT+0.7V<VIN<12V, TJ =25 C APE1185-XX O Vctrl=VIN+1V = 10mA, TJ = 25oC, 2.2VVIN12V I APE1185-1.2 OUT Vctrl=VIN+1V = 10mA, TJ = 25oC, 2.2VVIN12V I APE1185-1.5 OUT Vctrl=VIN+1V = 10mA, TJ = 25oC, 2.5VVIN12V I APE1185-1.8 OUT Vctrl=VIN+1V o IOUT = 10mA, TJ = 25 C, 3.2VVIN12V APE1185-2.5 Vctrl=VIN+1V IOUT = 10mA, TJ = 25oC, 4.0VVIN12V APE1185-3.3 Vctrl=VIN+1V o = 10mA, TJ = 25 C, 5.7VVIN12V I APE1185-5.0 OUT Vctrl=VIN+1V 0mA<Io<3A, TJ =25oC APE1185-Adj (VIN- VOUT)=2V ,Vctrl =VIN + 1V o VIN=3V, 0mA<Io<3A, TJ =25 C APE1185-1.2 Vctrl=4V o V =3V, 0mA<Io<3A, TJ =25 C APE1185-1.5 IN Vctrl=4V o V =3.3V, 0mA<Io<3A, TJ =25 C APE1185-1.8 IN Vctrl=4.3V o V =4V, 0mA<Io<3A, TJ =25 C APE1185-2.5 IN Vctrl=5V V = 5V, 0mA<Io<3A, TJ=25oC APE1185-3.3 IN Vctrl=6V VIN = 8V, 0mA<Io<3A, TJ=25oC APE1185-5.0 Vctrl=9V Vadj=0V for all conditions below. Vin=2.05V, Io=1.5A Vin=2.05V, Io=2A Vin=2.05V, Io=3A Vadj=0V for all conditions below. Vctrl =2.75V, Io=1.5A Vctrl =2.75V, Io=2A Vctrl =2.75V, Io=3A Vctrl =2.75V, Vin=2.05V,Vo=100mV, Vadj=0V Vctrl =5V, Vin=3.3V, Vadj=0V Min. Typ. Max. Unit 1.225 1.250 1.275 V 0.5 % 1.176 1.200 1.224 V 1.470 1.500 1.530 V 1.764 1.800 1.836 V 2.450 2.500 2.550 V 3.235 3.300 3.365 V 4.900 5.000 5.100 V 1 % 10 12 mV 12 15 mV 15 18 mV 20 25 mV 26 33 mV 40 50 mV 1.25 1.15 1.25 1.40 0.26 0.50 0.70 0.38 0.60 0.85 3.5 V V A 5 10 mA 3/7 Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Electrical Characteristics(Continued) o o Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150 C. Typical value refer to Tj=25 C. Vout=Vsense. Sym. Iadj JC Parameter Test Condition Thermal Regulation 30mS Pulse Vctrl =5V, Vin=5V, Io=3A, Vadj=0V, Tj=25, Vripple=1Vpp at Ripple Rejection 120Hz Vadj=0V for all conditions below. V =2.75V, Vin=2.05V, Io=1.5A Control Pin Current ctrl Vctrl =2.75V, Vin=2.05V, Io=2A Vctrl=2.75V, Vin=2.05V, Io=3A Adjust Pin Current Vctrl=2.75V, Vin=2.05,Vadj=0 TO-263: Control Circuitry/Power Transistor Thermal Resistance TO-220: Control Circuitry/Power Transistor Junction-to-Case TO-252: Control Circuitry/Power Transistor Min. Typ. 0.01 60 Max. Unit 0.02 %/W 70 6 30 33 50 2.7 2.7 10 dB 25 60 70 150 mA A C/W O C/W O C/W O NOTE: APE1185-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Functional Descriptions Introduction The APE1185 regulator is 5 terminal device designed specifically to provide extremely low dropout voltages comparable to the PNP type without the disadvantage of the extra power dissipation due to the base current associated with PNP regulators. This is done by bringing out the control pin of the regulator that provides the base current to the power NPN and connecting it to a voltage that is greater than the voltage present at the Vin pin. This flexibility makes the APE1185 ideal for applications where dual inputs are available such as a computer motherboard with an ATX style power supply that provides 5V and 3.3V to the board. One such application is the new graphic chip sets that require anywhere from 2.4V to 2.7V supply. The APE1185 can easily be programmed with the addition of two external resistors to any voltages within the range of 1.2V to 15.5V. Another major requirement of these graphic chips is the need to switch the load current from zero to several amps in tens of nanoseconds at the processor pins, which translates to an approximately 300 to 500ns of current step at the regulator. In addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification. The APE1185 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer number of output capacitors. Another feature of the device is its true remote sensing capability that allows accurate voltage setting at the load rather than at the device. Output Voltage Setting The APE1185-ADJ can be programmed to any voltages in the range of 1.2V to 15.5V with the addition of R1 and R2 external resistors according to the following formula: 4/7 Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Functional Descriptions(Continued) Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically Vin Vout APE1185-ADJ Vsense Vctrl Vref Adj Iadj=50uA The APE1185-ADJ keeps a constant 1.25V between the Vsense pin and the Adj pin. By placing a resistor R1 across these two pins and connecting the Vsense ans Vout pin together, a constant current flows through R1, adding to the Iadj current and into the R2 resistor producing a voltage equal to the (1.25/R1)*R2 + Iadj*R2. This voltage is then added to the 1.25V to set the output voltage. This is summarized in the above equation. Since the minimum load current requirement of the APE1185-ADJ is 10mA, R1 is typically selected to be a 121 resistor so that it automatically satisfies this condition. Notice that since the Iadj is typically in the range of 50uA it only adds a small error to the Vin R1+ R2+ output voltage and should be considered when very precise output voltage setting is required. Load Regulation Since the APE1185 has separate pins for the output (Vout) and the sense (Vsense), it is ideal for providing true remote sensing of the output voltage at the load. This means that the voltage drops due to parasitic resistance such as PCB traces between the regulator and the load are compensated for using remote sensing. Figure following shows a typical application of the APE1185-ADJ with remote sensing. Vin Vout APE1185-ADJ Vsense Vctrl Vctrl Adj R1 RL R2 Stability The APE1185-XX requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for the microprocessor applications use standard electrolytic capacitors with typical ESR in the range of 50 to 100m and an output capacitance of 100uF to 1000uF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The APE1185-XX takes advantage of the phenomena in making the overall regulator loop stable. For most applications a minimum of 100uF aluminum electrolytic capacitor insures both stability and good transient response. 5/7 Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Performance Characteristic 800 750 700 1200 Vpower = 2.05 V Vpower Dropout Voltage (mV) Vcontrol Dropout Voltage (mV) 1100 1000 Tj = 20 oC 900 Tj = 120 oC 800 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Vcontrol = 2.75 V 650 600 550 500 Tj = 120 oC 450 400 350 300 Tj = 20 oC 250 200 150 100 50 0 Output Current (A) 0.5 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Output Current (A) Vcontrol Dropout Voltage vs Output Current Vpower Dropout Voltage vs Output Current 1. 253 0. 15 0. 14 1. 252 0. 12 1. 251 Load Regulation (%) Reference Voltage (V) 0. 10 1. 250 1. 249 1. 248 1. 247 0 Tj = 120 oC 0. 08 0. 06 0. 04 Tj = 20 oC 0. 02 20 40 60 80 Junction Temperature ( oC) 100 120 Reference Voltage vs Junction Temperature 0 0 0.5 1.0 1.5 2.0 2.5 Output Current (A) 3.0 3.5 4.0 Load Regulation vs Output Current 6/7 Advanced Power Electronics Corp. APE1185 3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Performance Characteristic (continued ) VCONTROL = 5.0V VPOWER = 3.3V VOUT = 2.5V CCONTRROL=10uF CPOWER = 100uF CADJ = 0.1uF COUT = 470uF ILOAD 10mA to 3A Transient Response Marking Information ( Top View) Part Number 1185X-XX Logo ~ Y WW SSS Package Code XX: Blank=adj, 12= 1.2V, 15= 1.5V 18= 1.8V, 25= 2.5V 33= 3.3V, 50= 5.0V SSS: Internal code ( Optional) WW : Nth week : 01~52 Y : Year : "1"=2001 "2"=2002 ( TO252-5L / TO220-5L / TO263-5L ) 7/7 ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-263-5L Millimeters SYMBOLS MIN NOM MAX A 4.40 4.60 4.80 b 0.66 0.79 0.91 L4 0.00 0.15 0.30 c 0.36 0.43 0.50 L1 2.29 2.54 2.79 E 9.80 10.10 10.40 7.60 E1 c2 1.25 8.60 8.80 D1 5.90 e 1.70 L 1.45 1.27 L2 D 1.35 9.00 14.60 15.20 15.80 0 4 8 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : TO-263-5L 1185S-XX Part Number Package Code Output Voltage LOGO YWWSSS Date Code (YWWSSS) YLast Digit Of The Year WWWeek SSSSequence ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-252(5L) A SYMBOLS B Millimeters MIN NOM MAX A 6.40 6.6 6.80 B 5.2 5.35 5.50 C 6.80 7.00 7.20 D 2.20 2.50 2.80 1.27 REF. P E3 C M S 0.50 0.65 0.80 E3 3.50 4.00 4.50 G 0.40 0.50 0.60 H 2.20 2.30 2.40 J 0.45 0.50 0.55 K 0.00 0.075 0.15 L 0.90 1.20 1.50 M 5.40 5.60 5.80 D S P G 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. H K J L Part Marking Information & Packing : TO-252(5L) Part Number Package Code 1185H-XX Output Voltage LOGO YWWSSS Date Code (YWWSSS) YLast Digit Of The Year WWWeek SSSSequence ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-220-5L Millimeters SYMBOLS MIN NOM MAX A 4.07 4.45 4.82 b 0.76 0.89 1.02 C D E e 0.36 0.50 0.64 14.22 14.86 15.50 9.78 10.16 10.54 1.57 1.71 1.85 e1 6.68 6.81 6.93 F 1.14 1.27 1.40 H1 5.46 6.16 6.86 J1 2.29 2.74 3.18 L 13.21 13.97 14.73 p Q 3.68 3.81 3.94 2.54 2.73 2.92 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : TO-220-5L Part Number LOGO 1185P-XX Output Voltage Package Code YWWSSS Date Code (YWWSSS) YLast Digit Of The Year WWWeek SSSSequence