AP1605 DIODES | Alldatasheet

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Technical content

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 1 of 7 JANUARY 2007 www.diodes.com © Diodes Incorporated

  • 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 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. 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.
  • 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 AP1605 X X X Package Packing - U : Tube -13 : Taping S : SOP-8L Lead-Free L : Lead-Free G : Green Note: 2. Pad layout as shown on Dio des 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

Tube 13” Tape and Reel Device (Note 2) Package Code Packaging Quantity Part Number Suffix Quantity Part Number Suffix AP1605S S SOP-8L 100 -U 2500/Tape & Reel -13

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 2 of 7 JANUARY 2007 www.diodes.com © Diodes Incorporated ( Top View ) FB SWVcc SOP-8L AP1605 SW Vss Vss PVcc CE Pin No. Pin Name SOP Description FB 1 Feedback pin CE 2 Chip Enable: H: Enable L: Disable Vcc 3 IC signal power supply pin, add a 10 Ω resistor to PVcc and a 0.1µF capacitor to GND. PVcc 4 IC power supply pin SW 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/PFM -Switched Control Circuit AP1605 VSS FB PVCC SW VCC CE Pin Assignments Pin Descriptions

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 3 of 7 JANUARY 2007 www.diodes.com © Diodes Incorporated Absolute Maximum Ratings Symbol Parameter Rating Unit VCC VCC Pin Voltage V SS - 0.3 to VSS + 8 V PVCC PV CC Pin Voltage V SS - 0.3 to VSS + 8 V FB FB Pin Voltage V SS - 0.3 to VSS + 8 V VCE ON/OFF Pin Voltage V SS - 0.3 to VSS + 8 V VSW Switch Pin Voltage V SS - 0.3 to VIN + 0.3 V PD Power Dissipation 1200 mW TOPR Operating Temperature Range -20 to +85 oC TSTG Storage Temperature Range -20 to +125 oC Caution: The absolute maximum ratings are rated values ex ceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Electrical Characteristics ( VIN = 5V, TA = 25°C, unless otherwise specified ) Symbol Parameter Conditions Min. Typ. Max. Unit VIN Input Voltage AP1605 Series 2.5 -- 7 V VREF Internal Reference Voltage 1.1625 1.2 1.2375 V VUVLO UVLO Voltage Voltage required to maintain V OUT -- -- 2.2 V MAXDTY Maximum Duty Ratio 100 -- -- % PFMDTY PFM Duty Ratio 15 25 35 % ISW Switch Current Duty = 50% 3 -- -- A ISS Current Consumption POWERON VOUT = 2.5V -- 35 100 µA ISSS Current Consumption During Power Off VON/OFF = 0V -- -- 2 µA ∆VOUT1 Line Regulation 2.5V~7V @ I OUT = 0.1A -- 0.2 0.5 % ∆VOUT2 Load Regulation 0.1A~3A -- 1 1.5 % FOSC Oscillation Frequency 220 300 380 KHz VCEH CE Pin “High” Voltage Evaluate oscillation at SW pin 0.65 -- -- VCEL CE Pin “Low” Voltage Evaluate oscillation stop at SW pin -- -- 0.2 *Vcc ISL Power-Off Pin Input Leakage Current -- -0.1 -- 0.1 µA EFFI Efficiency V IN = 5V, VOUT = 2.5V IOUT = 1A -- 93 -- %

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 4 of 7 JANUARY 2007 www.diodes.com © Diodes Incorporated Typical Application Circuit （1） Normal Application CC RA RB OUT VSS FB PVCC SW VCC RVCC CVCC AP1605 =~200K CE RCE CCE R R (1VFBVout B A +×= 100K 0.1uF （2） Application with Short Circuit Protection AP 1605 -VSS CE CC RA RB VOUT : 1.8V FB PVCC SW VCC DVCC 1N4148 for above 5V Vin and Schottky for below 5V Vin CVCC 0.1uF CPVCC 100 uF CON/OFF 0.2uF RON/OFF 3.5M RBias 10M RSENCE COUTPUT 100 uF VIN : 2.5V~7V R R (1VFBVout B A +×= =~10K

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 5 of 7 JANUARY 2007 www.diodes.com © Diodes Incorporated Test Circuit A FBVcc Vss open open FBVcc Vss Osc il lation SW SW PVcc PVcc A FBVcc Vss V SW PVcc CE CE CEVcc Vcc Vcc VEN VEN Enable function test Feedback function test Operating function test 10uH RA RB 100 uF 100 uF 100uF 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. Therefor e, these converters provide a low-ripple power over broad rang es of input voltage and load current.

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 6 of 7 JANUARY 2007 www.diodes.com © Diodes Incorporated Marking Information (1) SOP-8L ( Top View ) Logo Part no. Internal code Year: "01" =2001 "02" =2002 Xth week: 01~52 ~1 4 8 5 AP1605 YY WW X X L : Lead Free Package G: Green Package Device Package Identification Code AP1605S SOP-8L AP1605 Package Information ( All Dimensions in mm ) Package Type: SOP-8L 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.

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR AP1605 Rev. 1 7 of 7 JANUARY 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.