AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER General Description Features * * * * * * * * * * * Input voltage: 3.6V to 22V Output voltage: 0.8V to VCC Duty ratio: up to 100% PWM control Oscillation frequency: 500KHz typ Soft-start Current Limit, Enable function Thermal Shutdown function Built-in internal SW P-channel MOS Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application Efficiency 90% SOP-8L: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish / RoHS Compliant (Note 1) AP5002 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP5002 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 500KHz to 50KHz. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. Applications * * * * * * * * * PC Motherboard LCD Monitor Graphic Card DVD-Video Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor core supply Networking power supply Ordering Information AP 5002 X X X Package S: SOP-8L Note: Note: Lead Free G : Green Packing - U : Tube -13 : Taping 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device Package Code Packaging (Note 2) AP5002S S SOP-8L Tube Part Number Quantity Suffix 100 -U 13" Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP5002 Rev. 2 1 of 9 www.diodes.com AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Pin Assignments Pin Descriptions ( Top View ) 8 Vss 7 Vss Comp 3 6 Output VCC 4 5 Output FB 1 EN 2 Name Pin FB 1 EN AP5002 Comp VCC Output SOP-8L VSS Description Feedback pin Power-off pin H: Normal operation 2 (Step-down operation) L: Step-down operation stopped (All circuits deactivated) 3 Compensation pin 4 IC power supply pin Switch Pin. Connect external 56 inductor/diode here. Minimize trace area at this pin to reduce EMI. 78 GND Pin Block Diagram Output Oscillation Circuit Reference Voltage Source Vcc + PWM-Switched Control Circuit FB - Thermal Shutdown 100uA VEN EN AP5002 Rev. 2 2 of 9 www.diodes.com Vss Comp AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Absolute Maximum Ratings Symbol VCC VFB VEN VOUTPUT PD TJ TST Parameter VCC Pin Voltage Feedback Pin Voltage EN Pin Voltage Switch Pin Voltage Power Dissipation Operating Junction Temperature Range Storage Temperature Range Rating VSS - 0.3 to VSS + 23 VSS - 0.3 to VCC VSS - 0.3 to VIN VSS - 0.3 to VIN 1000 -20 to +125 -65 to +150 Unit V V V V mW o C o C Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Recommended Operating Conditions Symbol VIN IOUT TA AP5002 Rev. 2 Parameter Input Voltage Output Current Operating Ambient Temperature 3 of 9 www.diodes.com Min 3.6 0 -20 Max 22 2 85 Unit V A o C AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Electrical Characteristics Symbol VIN VFB IFB ISW ISSS Parameter Input Voltage Feedback Voltage Feedback Bias Current Switch Current Current Consumption During Power Off VOUT Line Regulation /VOUT VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH EN Pin Input Voltage VSL EN Pin Input Leakage ISH Current ISL TSS Soft-Start Time RDSON Internal MOSFET Rdson JA JC Note: (VIN = 12V, TA = 25C, unless otherwise specified) Conditions Min 3.6 0.784 3.5 Typ. 0.8 0.1 - Max 22 0.816 0.5 - Unit V V A A VEN = 0V - 10 - A VIN = 5V~18V, IOUT = 0.2A - 1 2 % IOUT = 0.1 to 2A - 0.5 1 % Measure waveform at SW pin 400 500 600 KHz Measure waveform at SW pin 40 - - KHz Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin Ven = 2V Ven = 0.8V -VIN = 5V, VFB = 0V VIN = 12V, VFB = 0V 2.0 -10 -10 0.3 - 2 110 70 0.8 10 10 5 150 100 -IOUT = 0.1A IOUT = 0.1A -- V A A ms m Thermal shutdown 145 o Minimum Duty Cycle 6.5 % Thermal Resistance Junction-to-Ambient Thermal Resistance Junction-to-Case C SOP-8L (Note 3) 124 o C/W SOP-8L (Note 3) 25 o C/W 3. Test condition: Device mounted on 2oz copper, minimum recommended pad layout, FR-4 PCB. AP5002 Rev. 2 4 of 9 www.diodes.com AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Typical Application Circuit U1 VIN+12V 1 FB VSS EN VSS 8 ON/OFF R5 100K C2 22uF 2 7 L1 10uH C3 VOUT = 5V 1 3 0.1uF C6 0.1uF 4 COMP Output VCC Output 2 6 5 D1 B340 R1 6.8K C1 330pF C8 0.1uF AP5002 R4 2K C4 22uF R2 1.2K C7 0.1uF U1 VIN+12V 1 FB VSS EN VSS 8 ON/OFF R5 100K C2 22uF 2 7 L1 10uH C3 1 3 0.1uF C6 0.1uF 4 COMP Output VCC Output VOUT = 3.3V 2 6 5 D1 B340 R1 3.3K C1 330pF C8 0.1uF AP5002 R4 2K C4 22uF R2 1K C7 0.1uF U1 VIN+12V 1 FB VSS EN VSS 8 ON/OFF R5 100K C2 22uF 2 7 L1 10uH C3 1 3 0.1uF C6 0.1uF 4 COMP Output VCC Output VOUT = 1V 2 6 5 D1 B340 R1 3.3K C8 0.1uF AP5002 R4 1K AP5002 Rev. 2 C7 0.1uF 5 of 9 www.diodes.com C1 330pF R2 11K AUGUST 2007 (c) Diodes Incorporated C4 22uF AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Typical Performance Characteristics AP5002 Vin vs. Frequency (Vout=3.3V; Iout=0.2A) FB (V) Frequency (KHz) 592 590 588 586 584 582 580 578 576 574 572 570 0 5 10 Vin(V) 15 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.74 20 0 5 10 15 20 Vin (V) AP5002 Line Regulation ( Iout=0.2A) 3.46 AP5002 Vin vs. FB (Vout=3.3V; Iout=0.2A) AP5002 Load Regulation (Vin=12V) 3.46 3.455 Vout(V) Vout(V) 3.45 3.45 3.445 3.44 3.44 3.43 3.435 3.43 3.42 0 5 10 Vin(V) 15 20 0 0.5 1 Iout(A) 1.5 2 AP5002 Efficiency 100 90 Vout=5V Efficiency(%) 80 70 Vout=3.3V 60 50 40 30 20 10 0 0 AP5002 Rev. 2 0.5 1 Iout(A) 1.5 2 6 of 9 www.diodes.com AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Typical Performance Characteristics (Continued) AP5002 Vout Ripple (Vin=12V; Vout=5V; Iout=2A) AP5002 Vout Ripple (Vin=12V; Vout=5V; Iout=0.2A) Test Circuit VCC OUTPUT FB Oscillation open open COMP A EN + - VSS Enable function test VCC OUTPUT OUTPUT COMP EN FB VSS FB COMP EN VCC Feedback function test 22u 6.8K 6.8K 1500p + - A V + VSS - 1.2K Operation function test AP5002 Rev. 2 7 of 9 www.diodes.com AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER Function Description PWM Control The AP5002 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP5002, the pulse width varies in a range up to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Under Voltage Lockout The under voltage lockout circuit of the AP5002 assures that the high-side MOSFET driver output remain in the off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V. RDS(ON) Current Limiting The current limit threshold is set by the internal circuit. Marking Information (Top view) 8 7 6 5 Logo AP5002 Part Number YY XX X 1 2 3 G : Green X Internal Code Xth week: 01~52 Year: "07" = 2007 "08" = 2008 4 ~ 0.08/0.25 0.254 5.79/6.20 (unit: mm) 3.70/4.10 Package Information Detail "A" 7~9 0.3/0.5 1.27typ 0.38/1.27 45 0.20typ 1.75max. 1.30/1.50 0.35max. Gauge Plane Seating Plane 7~9 Detail "A" 3.70/4.10 4.80/5.30 AP5002 Rev. 2 8 of 9 www.diodes.com AUGUST 2007 (c) Diodes Incorporated AP5002 PWM CONTROL 2A STEP-DOWN CONVERTER IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP5002 Rev. 2 9 of 9 www.diodes.com AUGUST 2007 (c) Diodes Incorporated