AP3201AMHTR-G1

Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter General Description Features The AP3201A is a 380kHz fixed frequency, current mode, PWM buck (step-down) DC-DC converter, capable of driving a 2A load with high efficiency, excellent line and load regulation. The device integrates N-channel power MOSFET switch with low on-resistance. Current mode control provides fast transient response and cycle-by-cycle current limit. • • • • • • • • • • A standard series of inductors are available from several different manufacturers optimized for use with the AP3201A. This feature greatly simplifies the design of switch-mode power supplies. AP3201A Input Voltage Range: 4.75V to 18V Fixed 380kHz Frequency High Efficiency: up to 93% Output Current: 2A Current Mode Control Built-in Over Current Protection Built-in Thermal Shutdown Function Built-in UVLO Function Built-in Over Voltage Protection Programmable Soft-start Applications This IC is available in HMSOP-10 package.  • • • •   LCD TV Set Top Box Portable DVD Digital Photo Frame HMSOP-10 Figure 1. Package Type of AP3201A Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Pin Configuration MH Package (HMSOP-10)           Figure 2. Pin Configuration of AP3201A (Top View) Pin Description Pin Number Pin Name Function 1, 3 NC 2 BS 4 IN 5 SW 6 GND 7 FB 8 COMP 9 EN 10 SS No connection or tied to ground Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage across the bootstrap capacitor drives the internal high-side power MOSFET Supply input pin. A capacitor should be connected between the IN pin and GND pin to keep the input voltage constant Power switch output pin. This pin is connected to the inductor and bootstrap capacitor Ground pin Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. When the FB pin voltage exceeds 20% of the nominal regulation value of 0.920V, the over voltage protection is triggered. When the FB pin voltage is below 0.6V, the oscillator frequency is lowered to realize short circuit protection Compensation pin. This pin is the output of the transconductance error amplifier and the input to the current comparator. It is used to compensate the control loop. Connect a series RC network from this pin to GND. In some cases, an additional capacitor from this pin to GND pin is required Control input pin. Forcing this pin above 1.5V or set this pin floating enables the IC. Forcing this pin below 0.5V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1PA Soft-start control input pin. SS controls the soft start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1PF capacitor sets the soft-start period to 10ms. To disable the soft-start feature, leave SS unconnected Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Functional Block Diagram Figure 3. Functional Block Diagram of AP3201A Ordering Information AP3201A - Circuit Type G1: Green Package MH: HMSOP-10 TR: Tape & Reel Package Temperature Range HMSOP-10 -40 to 85ºC Part Number AP3201AMHTR-G1 Marking ID 3201AMH-G1 Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit IN Pin Voltage VIN -0.3 to 20 V EN Pin Voltage VEN -0.3 to VIN V SW Pin Voltage VSW 20 V BS Pin Voltage VBS -0.3 to VSW+6 V FB Pin Voltage VFB -0.3 to 6 V VCOMP -0.3 to 6 V SS Pin Voltage VSS -0.3 to 6 V Thermal Resistance TJA 60 ºC/W Operating Junction Temperature TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10sec) TLEAD 260 ºC ESD (Machine Model) 200 V ESD (Human Body Model) 2000 V COMP Pin Voltage 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 Symbol Min Max Unit Input Voltage VIN 4.75 18 V IOUT (Max) 2 TA -40 Maximum Output Current Operating Ambient Temperature Mar. 2011 Rev. 1. 0 A 85 ºC BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Electrical Characteristics VIN=VEN=12V, VOUT=3.3V, unless otherwise specified. Specification with standard typeface are for TA=25 ºC, and those in boldface type apply over the full operating temperature range (TA=-40 ºC to 85 ºC) Parameter Symbol Input Voltage VIN Quiescent Current IQ Shutdown Supply Current ISHDN Conditions Min Typ Max Unit 18 V 1.0 1.5 mA 1 10 PA 0.920 0.938 V 4.75 VFB=1.0V, VEN=2V VEN=0V Feedback Voltage VFB Feedback Over Voltage Threshold VFBOV 1.1 V Feedback SCP Voltage Threshold VFBSCP 0.6 V Feedback Bias Current IFB 0.902 VFB=1V -0.1 0.1 ISW=0.5A : : High-side Switch On-resistance (Note 2) RDSONH Low-side Switch On-resistance (Note 2) RDSONL ISW=0.05A 10 High-side Switch Leakage Current ILEAKH VIN=18V, VEN=0V VSW=0V 0.1 High-side Switch Current Limit ILIMH Low-side Switch Current Limit ILIML EN Pin Threshold PA 0.22 2.8 From drain to source VENH 10 PA 3.8 A 0.15 A 1.5 V VENL 0.5 PA EN Pull-up Current IEN-PH VEN=0V Input UVLO Threshold VUVLO VIN Rising Input UVLO Hysteresis VHYS 0.3 V Oscillator Frequency FOSC1 380 kHz Short Circuit Oscillator Frequency FOSC2 90 kHz Maximum Duty Cycle DMAX VFB=0.8V 90 % Minimum Duty Cycle DMIN VFB=1.0V Error Amplifier Voltage Gain (Note 3) AEA 400 V/V Error Amplifier Transconductance GEA 700 PA/V COMP to Current Sense Transconductance GCS 2.4 A/V Thermal Shutdown (Note 3) TOTSD 160 ºC Thermal Shutdown Hysteresis (Note 3) THYS 30 ºC 10 ms 6 PA Soft-start Time (Note 3) tSS Soft-start Current ISS Mar. 2011 IOUT=500mA CSS=0.1PF Rev. 1. 0 1.0 3.5 3.9 4.4 0 V % BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter Note 2: RDSON= AP3201A VSW 1 - VSW2 I SW1 - I SW2 Note 3: Not tested, guaranteed by design. Typical Performance Characteristics 375 3.50 350 3.45 325 3.40 Output Voltage (V) High-side Switch On-resistance (m:) TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. 300 275 250 225 3.35 3.30 3.25 3.20 200 3.15 175 3.10 150 3.05 125 -40 -20 0 20 40 60 80 100 120 3.00 0.0 140 0.5 1.0 Case Temperature ( C) Figure 4. High-side Switch On-resistance vs. Case Temperature 2.0 Figure 5. Output Voltage vs. Output Current 1.10 1.5 1.4 Quiescent Current (mA) 1.05 1.00 Feedback Volage (V) 1.5 Output Current (A) o 0.95 0.90 0.85 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.80 0.6 0.75 -60 -40 -20 0 20 40 60 80 100 120 0.5 -60 140 -20 0 20 40 60 80 100 120 140 Case Temperature ( C) Figure 7. Quiescent Current vs. Case Temperature Figure 6. Feedback Voltage vs. Case Temperature Mar. 2011 -40 o O Case Temperature ( C) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Typical Performance Characteristics (Continued) TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. IL 1A/div VSW 5V/div VOUT-AC 20mV/div VOUT-AC 100mV/div IL 1A/div Time (2Ps/div) Time (200Ps/div) Figure 8. Output Ripple (IOUT=2A) Figure 9. Load Transient (IOUT=1 to 2A) VEN 2V/div VOUT 1V/div VEN 2V/div VOUT 1V/div IL 1A/div IL 1A/div VSW 10V/div VSW 10V/div Time (10ms/div) Time (10ms/div) Figure 10. Enable Turn on Characteristic (IOUT=2A, CC Mode) Mar. 2011 Figure 11. Enable Turn off Characteristic (IOUT=2A, CC Mode) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Typical Performance Characteristics (Continued) TA=25 ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. VOUT 2V/div VOUT 2V/div IL 1A/div IL 1A/div VSW 5V/div VSW 5V/div Time (100Ps/div) Time (100Ps/div) Figure 12. Short Circuit Protection (IOUT=2A) Mar. 2011 Figure 13. Short Circuit Recovery (IOUT=2A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Typical Application Input 12V 10nF 4 IN 9 SW EN 10 CIN FB GND 6 CSS 0.1 F 5 AP3201A SS 10 F 2 BS C 330pF 7 COMP 8 CC 1nF 15 H Output 3.3V/2A R1 25.8k R2 10k C OUT 22 F R C 8.2k Figure 14. Typical Application of AP3201A Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A Mechanical Dimensions HMSOP-10 Unit: mm(inch) 0.400(0.016) 4.700(0.185) 5.100(0.201) 2.900(0.114) 3.100(0.122) 0.750(0.030) 2.500(0.100) 0.750(0.030) 2.500(0.100) 0.800(0.031) 2.900(0.114) 3.100(0.122) 0e 6e 0.170(0.007) 0.270(0.011) 0.500(0.020) BSC 0.950(0.037) REF 0.130(0.005) 0.200(0.008) 0.170(0.007) 0.230(0.009) BASE METAL 0.000(0.000) 0.150(0.006) 1.100(0.043) MAX. 0.080(0.003) 0.180(0.007) 0.170(0.007) 0.270(0.011) PLATING Note: 1. Eject hole, oriented hole and mold mark is optional. 2. The figure of exposed pad is not restrained as regular rectangle. Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 10 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others. 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