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 and Green Package: SOP-8L 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 AP1605 X X X Package Lead-Free S : SOP-8L L : Lead-Free G : Green Note: 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 (Note 2) Package Code Packaging Quantity AP1605S S SOP-8L 100 Tube Part Number Suffix -U 13” Tape and Reel Quantity Part Number Suffix 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. AP1605 Rev. 1 1 of 7 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Pin Descriptions Pin Assignments Pin Name FB ( Top View ) FB 1 CE 2 8 Vss AP1605 Pin No. SOP 1 CE 2 Vcc 3 PVcc 4 SW 5, 6 Vss 7, 8 7 Vss Vcc 3 6 SW PVcc 4 5 SW SOP-8L 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 Block Diagram SW PV CC FB AP1605 V CC PWM /PFM -Switched Control Circuit + - CE Oscillation Circuit Reference Voltage Source V SS AP1605 Rev. 1 2 of 7 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Absolute Maximum Ratings Symbol Parameter 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 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 VCC PVCC TOPR Operating Temperature Range TSTG Caution: Storage Temperature Range Symbol VIN VREF VUVLO MAXDTY PFMDTY Switch Current ∆VOUT1 ∆VOUT2 FOSC VCEH VCEL CE Pin “Low” Voltage ISH ISL EFFI Power-Off Pin Input Leakage Current Efficiency ISSS -20 to +125 o C C ( VIN = 5V, TA = 25°C, unless otherwise specified ) 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 Current Consumption POWERON Current Consumption During Power Off Line Regulation Load Regulation Oscillation Frequency CE Pin “High” Voltage ISS o 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. Electrical Characteristics ISW -20 to +85 AP1605 Rev. 1 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 3 of 7 www.diodes.com *Vcc µA µA % JANUARY 2007 © 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 R ON /OFF 3.5M R Bias 10M C PVCC C VCC 100 uF 0.1uF AP1605 Rev. 1 CC AP 1605 V CC C ON /OFF 0.2uF RA FB + CE V SS R SENCE 1M RB D1 =~10K - C OUTPUT 100 uF Vout = VFB × (1 + 4 of 7 www.diodes.com RA ) RB JANUARY 2007 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Test Circuit Vcc PVcc SW FB Oscillation open open A + Vcc A CE V EN Vcc Vss - 100uF V EN Enable function test Vcc PVcc SW CE Vss FB Feedback function test 10uH RB Vcc Vcc + - 100uF SW FB + V PVcc CE - RA 100uF Vss Operating function test Function 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. 1 5 of 7 www.diodes.com JANUARY 2007 © Diodes Incorporated AP1605 PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR Marking Information (1) SOP-8L ( Top View ) 8 5 Logo Part no. L : Lead Free Package G: Green Package AP1605 YY WW X X 4 Device AP1605S Package Information ~ 1 Internal code Xth week: 01~52 Year: "01" =2001 "02" =2002 Package Identification Code SOP-8L AP1605 ( All Dimensions in mm ) 0.254 0.08/0.25 5.79/6.20 3.70/4.10 Package Type: SOP-8L Gauge Plane Seating Plane 0.38/1.27 Detail "A" 7°~9° 0.20typ 1.75max. 1.30/1.50 0.35max. 45° 0.3/0.5 1.27typ 7°~9° Detail "A" 3.70/4.10 4.80/5.30 AP1605 Rev. 1 6 of 7 www.diodes.com JANUARY 2007 © 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. 1 7 of 7 www.diodes.com JANUARY 2007 © Diodes Incorporated