AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR General Description Features • • • • • • • • • AP1605 consists of CMOS step-down switching regulator with PWM/PFM dual mode control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. Low current consumption: In operation: 100µA max. Power off: 2µA max. Input voltage: 2.5V to 7V Adjustable version (+2.5%) PWM/PFM dual Mode Oscillation frequency: 300KHz (Typ.) With a power-off function. Built-in internal SW P-channel MOS Lead Free package: SOP-8L SOP-8L: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) AP1605 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM/PFM control circuit is able to vary the duty ratio linearly 0%~0.25% (PFM) and 25%~100% (PWM). 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 of up to 7V, it is also ideal when operating via an AC adapter. Applications • • • • • • On-board power supply of battery devices for portable telephones, electronic notebooks, PDA, and other hand-held sets Power supplies for audio equipment, including portable CD players and headphone stereo equipment Fixed voltage power supply for cameras, video equipment and communications equipment Power supplies for microcomputers. Conversion from four Ni-H or Ni-Cd cells or two lithium-ion cells to 3.3V/3V Conversion of AC adapter input to 5V/3V Ordering Information AP 1605 S X - 13 Device Lead-free AP1605SL-13 AP1605SG-13 Notes: Package Lead Free Packing S : SOP-8L L : Lead Free G : Green 13 : Tape & Reel Package Code S S Packaging (Note 2) SOP-8L SOP-8L 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 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. AP1605 Rev. 2 1 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Pin Assignments ( Top View ) FB 1 8 Vss CE 2 7 Vss Vcc 3 6 SW PVcc 4 5 SW SOP-8L Pin Descriptions Pin Name Pin No. FB 1 CE 2 Vcc 3 PVcc 4 SW 5, 6 Vss 7, 8 AP1605 Rev. 2 Description Feedback pin Chip Enable: H: Enable L: Disable IC signal power supply pin, add a 10Ω resistor to PVcc and a 0.1µF capacitor to GND. IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. GND Pin 2 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Block Diagram SW PV CC FB AP1605 V CC PWM /PFM -Switched Control Circuit + - CE Oscillation Circuit Reference Voltage Source V SS Absolute Maximum Ratings Symbol Rating Unit VCC Pin Voltage VSS - 0.3 to VSS + 8 V PVCC Pin Voltage VSS - 0.3 to VSS + 8 V FB FB Pin Voltage VSS - 0.3 to VSS + 8 V VCC PVCC Parameter VCE ON/OFF Pin Voltage VSS - 0.3 to VSS + 8 V VSW Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V PD Power Dissipation 1200 mW TOPR Operating Temperature Range TSTG Caution: Storage Temperature Range -20 to +85 o C -20 to +125 o C 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. AP1605 Rev. 2 3 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Electrical Characteristics Symbol VIN VREF VUVLO MAXDTY PFMDTY ISW Parameter Conditions Min. Input Voltage AP1605 Series 2.5 Internal Reference Voltage 1.1625 UVLO Voltage Voltage required to maintain VOUT -Maximum Duty Ratio 100 PFM Duty Ratio 15 Switch Current ∆VOUT1 ∆VOUT2 FOSC VCEH Current Consumption POWERON Current Consumption During Power Off Line Regulation Load Regulation Oscillation Frequency CE Pin “High” Voltage VCEL CE Pin “Low” Voltage ISH ISL EFFI Power-Off Pin Input Leakage Current Efficiency ISS ISSS (VIN = 5V, TA = 25°C, unless otherwise specified) AP1605 Rev. 2 Typ. -1.2 --25 Max. Unit 7 V 1.2375 V 2.2 V -% 35 % Duty = 50% 3 -- -- A VOUT = 2.5V -- 35 100 µA VON/OFF = 0V -- -- 2 µA --220 0.65 0.2 1 300 -- 0.5 1.5 380 -- % % KHz -- -- 0.2 -0.1 -0.1 -- --93 0.1 0.1 -- 2.5V~7V @ IOUT = 0.1A 0.1A~3A Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin --VIN = 5V, VOUT = 2.5V IOUT = 1A 4 of 8 www.diodes.com *Vcc µA µA % FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Typical Application Circuit （1） Normal Application OUT PV CC SW CC RA R VCC FB + AP1605 V CC RB =~200K D1 C VCC - RCE 100K CE V SS CCE 0.1uF Vout = VFB × (1 + RA ) RB （2） Application with Short Circuit Protection V IN : 2.5V~7V V OUT : 1.8V PV CC SW D VCC 1N4148 for above 5V Vin and Schottky for below 5V Vin CC AP 1605 RA V CC FB R ON /OFF 3.5M R Bias 10M C PVCC C VCC 100 uF 0.1uF C ON /OFF 0.2uF + CE RB V SS D1 =~10K - C OUTPUT 100 uF R SENCE 1M Vout = VFB × (1 + RA ) RB AP1605 Rev. 2 5 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Test Circuit Functional Description PWM/PFM Control (AP1605 Series) The AP1605 consists of DC/DC converters that employ a PWM/PFM auto-switch system. In converters of the AP1605, the PFM mode varies in a range of duty cycle from 0% to 25%, and the PWM mode varies in a range of duty cycle from 25% to 100% according to the load current, and yet 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. AP1605 Rev. 2 6 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Marking Information (1) SOP-8L ( Top View ) 5 8 L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code Logo AP1605 YY WW X X Part Number 1 Package Information 4 ( All Dimensions in mm ) 0.254 0.10/0.20 3.85/3.95 5.90/6.10 (1) Package Type: SOP-8L Gauge Plane Seating Plane 0.62/0.82 Detail "A" 7°~9° 0.15/0.25 1.30/1.50 1.75max. 0.35max. 45° 7°~9° Detail "A" 0°/8° 0.3/0.5 1.27typ 4.85/4.95 5.4 8x-0.60 8x-1.55 6x-1.27 Land Pattern Recommendation (Unit: mm) AP1605 Rev. 2 7 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR 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. AP1605 Rev. 2 8 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated