Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER General Description Features The AP4305 is a highly integrated solution for a constant voltage/constant current mode SMPS application. * * * * * * The AP4305 contains one 1.21V voltage reference with 0.5% accuracy, one current sensing circuit and two operational amplifiers. Combining the voltage reference with one operational amplifier makes AP4305 an ideal voltage controller for use in adapters and battery chargers. The other low voltage reference combined with the other operational amplifier makes it an ideal current limiter for output low side current sensing. AP4305 Constant Voltage and Constant Current Control Precision Internal Voltage Reference Few External Components Easy Compensation Low Supply Current: 0.5mA Operating Temperature Range: -40 to 105oC Applications * * Adapters Battery Chargers The AP4305 is available in SOT-23-6 package. SOT-23-6 Figure 1. Package Type of AP4305 May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 1 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Pin Configuration K Package (SOT-23-6) Pin 1 Dot by Marking VCTRL 1 6 VCC GND 2 5 VSENSE VOUT 3 4 ICTRL Figure 2. Pin Configuration of AP4305 (Top View) Pin Description Pin Number Pin Name Function 1 VCTRL 2 GND Ground 3 VOUT Output pin. Sinking current only 4 ICTRL Input pin of the current control loop 5 VSENSE Input pin of the current control loop 6 VCC Input pin of the voltage control loop Power supply May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 2 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Functional Block Diagram VCC 6 1.210V 3 VOUT 1 VCTRL 2 GND 200mV 5 4 ICTRL VSENSE Figure 3. Functional Block Diagram of AP4305 Ordering Information AP4305 - Circuit Type G1: Green Package K: SOT-23-6 TR: Tape and Reel Package Temperature Range SOT-23-6 -40 to 105oC Part Number AP4305KTR-G1 Marking ID G2B Packing Type Tape & Reel BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green. May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 3 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Power Supply Voltage VCC 20 V Input Voltage VIN -0.3 to VCC V Junction Temperature TJ 150 Storage Temperature TSTG -65 to 150 oC TLEAD 260 oC JC 92 Lead Temperature (Soldering, 5sec) Package Thermal Resistance (Junction to Case) o o C C/W Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Power Supply Voltage Operating Temperature Range Symbol Min Max Unit VCC 2.5 18 V TA -40 105 oC May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 4 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Electrical Characteristics (VCC=5V, TA=25oC, unless otherwise specified.) Parameter Symbol Conditions Min Typ Max TA=25oC 0.5 1 -40oC<TA<105oC 0.6 Unit TOTAL CURRENT CONSUMPTION Total Supply Current Not Including the Output Sinking Current ICC mA VOLTAGE CONTROL LOOP Transconduction Gain (VCTRL). Sink Current Only Gmv Voltage Control Loop Reference VREF Input Bias Current (VCTRL) 1 TA=25oC mA/mV 2.5 -40oC<TA< 105oC IIBV 3.5 TA=25oC 1.204 -40oC<TA< 105oC 1.186 1.21 1.216 V 1.234 TA=25oC 50 -40oC<TA< 105oC 100 nA CURRENT CONTROL LOOP Transconduction Gain (ICTRL). Sink Current Only Current Control Loop Reference Current Out of Pin ICTRL at 200mV Gmi VSENSE IIBI TA=25oC 1.5 7 IOUT=2.5mA, TA=25oC 198 200 IOUT=2.5mA, -40oC<TA< 105oC 192 mA/mV 202 208 TA=25oC 25 -40oC<TA< 105oC 50 TA=25oC 200 TA=25oC 27 -40oC<TA< 105oC 35 mV A OUTPUT STAGE Low Output Voltage at 10mA Sinking Current VOL Output Short Circuit Current. Output to VCC, Sink Current Only IOS mV 50 mA May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 5 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Typical Performance Characteristics 1.220 203 1.215 VCC=12V VCC=5V VCC=2.5V 202 VSENSE (mV) VREF (V) 1.210 1.205 201 200 1.200 199 1.195 1.190 -40 -20 0 20 40 60 80 100 198 -40 120 -20 0 o Ambient Temperature ( C) 60 80 100 120 Figure 5. VSENSE vs. Ambient Temperature 45 100 VCC=12V VCC=5V VCC=2.5V 80 VCC=12V VCC=5V VCC=2.5V 40 35 IIBI (A) 60 IIBV (nA) 40 o Figure 4. VREF vs. Ambient Temperature 40 30 20 25 0 20 -20 -40 20 Ambient Temperature ( C) -20 0 20 40 60 80 100 15 -40 120 -20 0 20 40 60 80 100 120 o o Ambient Temperature ( C) Ambient Temperature ( C) Figure 6. IIBV vs. Ambient Temperature Figure 7. IIBI vs. Ambient Temperature May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 6 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Typical Performance Characteristics (Continued) 1.6 1.4 VCC=12V VCC=5V VCC=2.5V 50 1.2 Supply Current (mA) Output Short Circuit Current (mA) 60 40 30 20 VCC=12V VCC=5V VCC=2.5V 10 0 -40 -20 0 20 40 60 80 100 1.0 0.8 0.6 0.4 0.2 0.0 -40 120 o -20 0 20 40 60 80 100 120 o Ambient Temperature ( C) Ambient Temperature ( C) Figure 8. Output Short Circuit Current vs. Figure 9. Supply Current vs. Ambient Temperature Ambient Temperature May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 7 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Typical Application VOUT+ To primary AP4305 VCC R4 1.210V R3 VOUT + R2 IL C1 + VCTRL Load C3 GND R5 VSENSE ICTRL R1 R6 500 VOUT- Rss VOUT = VREF x R1 + R 2 R1 (V) VSENSE RSS (A) CurrentLimit = Figure 10. Typical Application 1 of AP4305 May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 8 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Typical Application (Continued) VOUT+ To primary AP4305 VCC R4 1.210V R3 VOUT + R2 IL C1 + VCTRL Load C3 GND ICTRL R5 VSENSE R1 R6 500 VOUTRss VOUT = [VREF + ( I L x RSS )] x R1 + R 2 - ( I L x RSS ) R1 CurrentLimit = VSENSE RSS (V) (A) Figure 11. Typical Application 2 of AP4305 May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 9 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Typical Application (Continued) VOUT+ To primary AP4305 VCC R4 1.210V VOUT + R3 R2 IL C1 + VCTRL Load C3 GND ICTRL R5 VSENSE R1 R6 500 VOUTRss VOUT = VREF x R1 + R 2 - ( I L x RSS ) R1 CurrentLimit = (V) VSENSE x VREF (VSENSE + VREF )x RSS (A) Figure 12. Typical Application 3 of AP4305 May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 10 Data Sheet CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305 Mechanical Dimensions SOT-23-6 Unit: mm(inch) 0 2.820(0.111) 8 3.020(0.119) 0.300(0.012) 0.400(0.016) 5 0.300(0.012) 0.600(0.024) 4 1.500(0.059) 1.700(0.067) 2.650(0.104) 2.950(0.116) 6 0.200(0.008) Pin 1 Dot by Marking 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.150(0.006) 1.800(0.071) 2.000(0.079) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.450(0.057) MAX 1.300(0.051) May 2010 Rev. 2. 0 BCD Semiconductor Manufacturing Limited 11 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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