AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER General Description Features • • • • • • • • • • Input voltage range: 2.2V~5.5V (VOUT type) Oscillator frequency: 600KHz (Typ.) Internal reference: 1.0V (Typ.) High efficiency: 93% (Typ.) Stand-by capability: ISTB=2µA. (Typ.) Soft-start time set-up externally type possible Current limit and thermal shutdown protection Packages: SOT25-5L Lead Free Finish/RoHS Compliant for Lead Free and “Green” products (Note 1) SOT25-5L: Available in “Green” Molding Compound (No Br, Sb) The AP1604 series are multi-functional step-down DC/DC converters with built-in speed, low ON resistance drivers. It is capable to deliver more than 800mA output current with external coil, diode and capacitor. Output voltage is set-up by the external resistors. (±2.5% accuracy). The 600KHz AP1604 that can work out with small value external components comes out more compact board. The device switches to and works under PFM mode with light loads. It keeps at high efficiency for both light loads and large output current. AP1604 can be soft-start with a proper capacitor connected between CE/SS pin and ground. The stand-by current is less than 2uA when CE/SS pin is at “LOW” status. The device is forced to switch off as the voltage at that pin is lower than the stipulated voltage. Applications • • • • • Electronic Information Organizers Palmtops Cellular and portable phones Portable Audio Systems Various Multi-function Power Supplies Ordering Information AP1604 X X X X Version Package A: AP1604A Notes: W: SOT25-5L L : Lead Free G : Green -7 : 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) AP1604AW Note: Packing Lead Free 7” Tape and Reel Quantity Part Number Suffix Package Code Packaging W SOT25-5L 3000/Tape & Reel -7 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. AP1604A Rev. 2 1 of 7 www.diodes.com OCTOBER 2006 © Diodes Incorporated AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Pin Description Pin Name VOUT GND VCC CE/SS FB Function Output Voltage Ground Input Supply Chip Enable / Soft Start Feedback pin Pin Assignment (Top View) CE/SS 4 FB 5 AP1604A 1 V OUT 2 GND 3 VCC SOT25-5L Block Diagram SVCC FB + - AP1604A Rev. 2 Vref with CE Current Limit + ERR AMP Soft Start CE/SS VCC Phase Compensation PWM/PFM Controller 2 of 7 www.diodes.com - VOUT PWM Comparator Ramp Wave Generator, OSC GND OCTOBER 2006 © Diodes Incorporated AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Absolute Maximum Ratings Symbol TA=25°C Parameter Ratings Units V V V V VCC/SVCC VOUT VFB VCE/SS VIN Pin Voltage VOUT Pin Voltage FB Pin Voltage CE/SS Pin Voltage -0.3 ~ 6.5 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 Pd Continuous Total Power Dissipation Internal limited Topr Operating Ambient Temperature -25 ~ +80 °C Tstg Storage Temperature -40 ~ +125 °C Electrical Characteristics VIN = 5V, VOUT＝2V, Load = 300mA, TA = 25°C Sym. VFB VIN Parameter FB Input Voltage Line Regulation Load Regulation UVLO Voltage（min. operating voltage） Operating Current Conditions VIN = 2.2 ~ 5.5V, Load = 10mA IOUT = 10 ~ 800mA VCC, voltage required to maintain H at VUVLO VOUT ICC CE/SS = VIN, No Load No external components, ICCQ Supply Current CE/SS = VIN, VFB = 1.2V No external components, ISTB Stand-by Current CE/SS = 0V, VFB = 0V peak current ICL Current Limit VIN = 5V, VOUT = 2V Fosc Oscillator Frequency Load = 300mA, VIN = 5V, VOUT = 2V MAXDTY Maximum Duty Ratio PFMDTY PFM Duty Ratio No load Apply 1.4V (min.) to CE/SS, determine VCEH CE/SS ”High” Voltage VOUT ”High” VCEL CE/SS ”Low” Voltage Same as VCEH, determine VOUT/”Low” EFFI Efficiency VCC = 5V, VOUT = 3.3V, Load = 300mA Rdson Rdson Condition IOUT = 300mA, VIN = 5V, VOUT = 2V AP1604A Rev. 2 3 of 7 www.diodes.com Min. 0.975 2.2 - Typ. 1.0 - Max. 1.025 5.5 0.12 1.2 Units V V % % - - 2 V - 100 150 µA - 90 120 µA - 2 - µA 800 1000 1200 mA 500 85 15 600 90 25 700 35 kHz % % 1.4 - - V - 93 350 0.6 450 V % mΩ OCTOBER 2006 © Diodes Incorporated AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Typical Performance Characteristics Vcc vs. Quiescent Current 200 200 180 180 160 160 Quiescent Current (uA) Operating Current (uA) Vcc vs. Operating Current 140 120 100 80 60 40 20 0 140 120 100 80 60 40 20 0 2.5 3 3.5 4 4.5 5 5.5 2.5 3 3.5 Vcc (V) 4.5 5 5.5 Vcc vs. Frequency 700 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 680 660 Frequency (KHz) Stand-by Current (uA) Vcc vs. Stand-by Current 640 620 600 580 560 540 520 2.5 3 3.5 4 4.5 5 500 5.5 2.5 Vcc (V) 3 Vcc vs. Current Limit 3.5 4 Vcc (V) 4.5 5 5.5 4.5 5 5.5 Vcc vs. RDS(ON) 1.4 600 1.3 500 1.1 RDS(ON) (mΩ) 1.2 Current Limit (A) 4 Vcc (V) Current Limit 1 0.9 0.8 0.7 400 300 200 100 0.6 Vout=2V 0.5 3 3.5 4 4.5 5 0 5.5 Vcc (V) AP1604A Rev. 2 4 of 7 www.diodes.com 2.5 3 3.5 4 Vcc (V) OCTOBER 2006 © Diodes Incorporated AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Typical Performance Characteristics (Continued) Load Regulation 0.3 3 0.2 2 0.1 1 V / VOUT (%) V / VOUT (%) Line Regulation 0.0 -0.1 -0.2 0 -1 -2 -0.3 -3 2.5 3 3.5 4 Vcc (V) 4.5 5 5.5 0 100 200 300 400 500 600 Load (mA) 700 800 Typical Application Circuit 2.2V ~ 5.5V VIN CE/SS GND B240A R2 FB R1 10nF 0.1uF 68uF ~ 0.1uF VOUT AP1604A 1MΩ 68uF 10uH VOUT VCC 100nF Vout = 1 × (1 + R2 ) R1 R1 = 100K ~ 200K AP1604A Rev. 2 5 of 7 www.diodes.com OCTOBER 2006 © Diodes Incorporated AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Marking Information (1) SOT25-5L 4 7 5 XX Y M X 1 2 3 XX : Identification code Y : Year: 0-9 M : Month: A~L X : Blank : Lead-Free G : Green Part Number Package Identification Code AP1604AW SOT25-5L ER Package Information (1) Package Type: SOT25-5L AP1604A Rev. 2 6 of 7 www.diodes.com OCTOBER 2006 © Diodes Incorporated AP1604A PWM/PFM DUAL MODE STEP-DOWN DC/DC 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. AP1604A Rev. 2 7 of 7 www.diodes.com OCTOBER 2006 © Diodes Incorporated