AP5001

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 9

Technical content

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 1 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated

  • Input voltage: 3.6V to 20V
  • Output voltage: 0.8V to VCC
  • Duty ratio: 0% to 100% PWM control
  • Oscillation frequency:800KHz typ
  • Soft-start Current Limit, Enable function
  • Thermal Shutdown function
  • Built-in internal SW P-channel MOS
  • Low ESR output capacitor (MLCC, multi-layer ceramic capacitor) support
  • Efficiency 86%
  • SOP-8L: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish / RoHS Compliant (Note 1) AP5001 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS. AP5001 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 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 800KHz 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 20V, it is also suitable for the operation via an AC adapter.
  • PC Motherboard
  • LCD Monitor
  • Graphic Card
  • DVD-Video Player
  • Telecom Equipment
  • ADSL Modem
  • Printer and other Peripheral Equipment
  • Microprocessor core supply
  • Networking power supply AP5001 X X X Package Packing S: SOP-8L -U : Tube -13 : Tape & Reel Lead Free G:G r e e n Tube 13” Tape and Reel Device Package Code Packaging (Note 2) Quantity Part Number Suffix Quantity Part Number Suffix AP5001S S SOP-8L 100 -U 2500/Tape & Reel -13 Note: 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. Features General Description

Applications

Ordering Information

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 2 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated ( Top View ) FB OutputComp SOP-8L AP5001 Output EN Vss Vss VCC Name Pin Description FB 1 Feedback pin EN 2 Power-off pin H: Normal operation (Step-down operation) L: Step-down operation stopped (All circuits deactivated) Comp 3 Compensation pin VCC 4 IC power supply pin Output 5、6 Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. VSS 7、8 GND Pin Block Diagram Oscillation Circuit Reference Voltage Source PWM-Switched Control Circuit VssVEN EN 100uA Comp FB Vcc Thermal Shutdown Output Pin Assignments Pin Descriptions

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 3 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated Absolute Maximum Ratings Symbol Parameter Rating Unit ESD HBM Human Body Model ESD Protection 5 KV ESD MM Machine Model ESD Protection 200 V VCC VCC Pin Voltage VSS - 0.3 to VSS + 22 V VFB Feedback Pin Voltage VSS - 0.3 to VCC V VEN EN Pin Voltage VSS - 0.3 to VIN V VOUTPUT Switch Pin Voltage VSS - 0.3 to VIN V PD Power Dissipation 1000 mW TJ Operating Junction Temperature Range -20 to +125 oC TST Storage Temperature Range -65 to +150 oC Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values m ust therefore not be exceeded under any conditions. Recommended Operating Conditions Symbol Parameter Min Max Unit VIN Input Voltage 3.6 20 V IOUT Output Current 0 1.5 A TA Operating Ambient Temperature -20 85 oC

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 4 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated Electrical Characteristics (VIN = 12V, TA = 25°C, unless otherwise specified) Symbol Parameter Conditions Min Typ. Max Unit VFB Feedback Voltage I OUT = 0.1A 0.784 0.8 0.816 V IFB Feedback Bias Current I OUT = 0.1A - 0.1 0.5 µA ISW Switch Current -- 2.5 - - A ISSS Current Consumption During Power Off V EN = 0V - 10 - µA ∆VOUT /VOUT Line Regulation VIN = 5V~18V, IOUT = 0.2A - 1 2 % ∆VOUT /VOUT Load Regulation I OUT = 0.1 to 1.5A - 1 2 % fOSC Oscillation Frequency Measure waveform at SW pin 700 800 900 KHz fOSC1 Frequency of Current Limit or Short Circuit Protect Measure waveform at SW pin 40 - - KHz VSH Evaluate oscillation at SW pin 2.0 - - VSL EN Pin Input Voltage Evaluate oscillation stop at SW pin - - 0.8 V ISH Ven = 2V -10 - 10 µA ISL EN Pin Input Leakage Current Ven = 0.8V -10 - 10 µA TSS Soft-Start Time -- 0.3 2 5 ms VIN = 5V, VFB = 0V - 110 150 RDSON Internal MOSFET Rdson VIN = 12V, VFB = 0V - 70 100 mΩ Thermal shutdown 145 oC Minimum Duty Cycle 6.5 % θJA Thermal Resistance Junction-to-Ambient SOP-8L (Note 3) 124 oC/W θJC Thermal Resistance Junction-to-Case SOP-8L (Note 3) 25 oC/W Note: 3. Test condition: Device mounted on 2oz copper, minimum recommended pad layout, FR-4 PCB.

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 5 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated Typical Application Circuit AP5001 4 5 8FB EN COMP VCC Output Output VSS VSS 0.1uF 0.1uF 0.1uF 0.1uF 330pF 22uF Dii 229 B230A L1 10uH 1 2 0.8~2K 3.3K VIN+12V 100K VOUT = 3.3V 22uF ON/OFF Note: 4. VOUT=VFB ) (1 + × VOUT (V) R1 (KΩ) R2 (KΩ)

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 6 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated Typical Performance Characteristics AP5001 Vin vs. Frequency (Vout=3.3V; Iout=0.2A) 848 850 852 854 856 858 860 862 864 866 0 51 0 1 5 2 0 Vin(V) Frequency(KHZ) AP5001 Vin vs. FB (Vout=3.3V; Iout=0.2A) 0.8 0.802 0.804 0.806 0.808 0 5 10 15 20 25Vin(V) VFB(V) AP5001 Line Regulation ( Iout=0.2A) 3.43 3.435 3.44 3.445 3.45 3.455 3.46 0 5 10 15 20 Vin(V) Vout(V) AP5001 Load Regulation (Vin=12V) 3.42 3.43 3.44 3.45 3.46 00 . 511 . 52 Iout(A) Vout(V) AP5001 Efficiency 100 0 0.5 1 1.5 Iout(A) Efficiency(%) Vout=5V Vout=3.3V

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 7 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated Typical Performance Characteristics (Continued) AP5001 Vout Ripple (Vin=12V; Vout=5V; Iout=0.2A) AP5001 Vout Ripple (Vin=12V; Vout=5V; Iout=1.5A) Test Circuit A FBVCC VSSEN open open FBVCC VSSEN Oscillation OUTPUT OUTPUTA FBVCC VSSEN - + V OUTPUT COMP COMP COMP Enable function test Feedback function test Operation function test 1.2K 6.8K 22u 6.8K 1500p

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 8 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated Function Description PWM Control The AP5001 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP5001, the pulse width varies in a range from 0 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 AP5001 assures that the high-side MOSFET driver outputs 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 setting by the internal circuit. Marking Information AP5001 (Top view) YY XX Part Number Logo Xth week: 01~52 Year: "07" = 2007 "08" = 2008 X G : Green X Internal Code 8765 1 2 34 Package Information (unit: mm) 1.27typ 0.3/0.5 7°~9° 4.80/5.30 3.70/4.10 5.79/6.20 0.20typ 7°~9° 3.70/4.10 0.38/1.27 0.08/0.25 Gauge Plane 0.254 Seating Plane 0.35max. 45° Detail "A" Detail "A" 1.30/1.50 1.75max. Land Pattern Recommendation 0.78 6x-1.27 8x-1.0 5.1 8x-0.41 (Unit: mm)

PWM CONTROL 1.5A STEP-DOWN CONVERTER AP5001 Rev. 1 9 of 9 OCTOBER 2007 www.diodes.com © Diodes Incorporated IMPORTANT NOTICE LIFE SUPPORT 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. 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.