AP1621 PWM/PFM Dual Mode Step-down DC/DC Controller Features General Descriptions - Input voltage range:2.2V~7VVOUT type - Adjustable version2.5% - Oscillator frequency: 300KHz20% - High Efficiency: 92%typ . - Stand-by capability: ISTB2A.Max . - Output voltage type possibleFB - Package: SOT23-5 The AP1621 series are multi-functional step-down DC/DC converters with built-in speed, low ON resistance drivers. A more than 1A output current is possible using an externally connected transistor, coil, diode and capacitor. Output voltage is set-up by external resistor.2.5% accuracy. With a 300KHz switching frequency, the size of the external components can be reduced. Control switches from PWM to PFM during light loads with the AP1621PWM/PFM switchableand the series is highly efficient from light loads to large output currents. During stand-by time CE pin "LOW",current consumption is reduced to less than 2A. With U.V.L.O internal, the external MOSFET. Will be forcibly switched off if used below the stipulated voltage. Applications Electronic Information Organizers Palmtops Cellular and portable phones Portable Audio Systems Various Multi-function Power Supplies Pin Assignment Pin Descriptions Pin No. A B (Top View) Pin Name Function FB CE VDD VOUT 1 4 V OUT External PMOSFET Connection 5 4 5 4 2 2 GND Ground 3 5 V DD Power Supply 4 1 CE Chip Enable: H: Enable L: Disable 5 3 FB Feedback pin AP1621A 1 2 VOUT GND AP1621B 3 1 2 3 VDD CE GND FB SOT23-5 This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.2 Dec. 23, 2004 1/5 AP1621 PWM/PFM Dual Mode Step-down DC/DC Controller Ordering Information AP1621X X X X X Version A : A version B : B version Vout Package Blank: Adjustable -33: 3.3V W : SOT23-5 Packing Lead Free Blank : Normal A : Taping L : Lead Free Package Block Diagrams FB VDD Phase Compensation + + - Vref with CE CE - PWM/PFM Controller Buffer, Driver Vout PWM Comparator Ramp Wave Generator, OSC GND Absolute Maximum Ratings Ta=25C Parameter VIN Pin Voltage VOUT Pin Voltage FB Pin Voltage CE Pin Voltage VOUT Pin Current Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature Symbol Rating Unit VDD VOUT VFB VCE VOUT -0.3 ~ 8 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 100 V V V V mA Pd 250 mW Topr -30 ~ +80 C Tstg -40 ~ +125 C Anachip Corp. www.anachip.com.tw Rev. 1.2 Dec 23, 2004 2/5 AP1621 PWM/PFM Dual Mode Step-down DC/DC Controller Electrical Characteristics AP1621 VOUT3.3V, FOSC300kHz Parameter FB Voltage Output Voltage Maximum Input Voltage UVLO VoltageMin. Operating Voltage Ta=25C Symbol VFB VOUT VIN VUVLO Supply Current IDD Stand-by Current ISTB Oscillator Frequency Fosc Maximum Duty Ratio PFM Duty Ratio MAXDTY PFMDTY CE "High" Voltage VCEH CE "Low" Voltage VCEL Conditions AP1621-33 only Same as IDD, voltage required to maintain H at VOUT No external components, CE=VIN, VOUT=0V No external components, CE=VIN, VOUT=0V Measuring of EXT/waveform, VIN=output voltage+0.3V No load (AP1621 only) No external components, VFB=0V, apply 0.65V (min.) to CE, determine VOUT"Low" Same as VCEH, determine EXT/"High" Min. Typ. Max. Unit 1.1625 3.2 7 1.2 3.3 - 1.2375 3.4 - V V V - - 2.2 V - 35 102 A - - 2 A 240 300 360 KHz 100 15 25 35 % % 0.65 - - *Vcc - - 0.20 *Vcc Efficiency EFFI 92 % Measuring conditions: Unless otherwise specified, connect external components. VIN=5.0V,LOUT=220mA Series Amendment: AP1621 External Components: CCE 0.1F, RCE100k Anachip Corp. www.anachip.com.tw Rev. 1.2 Dec 23, 2004 3/5 AP1621 PWM/PFM Dual Mode Step-down DC/DC Controller Typical Application Circuit (1) AP1621-Adj PMOS OUT L C FB R VCC VOUT FB + V CC C VCC RA D1 AP1621 RB =~200K - RCE 100K CE V SS CCE 0.1uF Vo = Vref x (1 + RA ) RB (2) AP1621-33 Only PMOS R VCC L VOUT FB OUT + V CC C VCC D1 AP1621 - RCE 100K CE V SS CCE 0.1uF Marking Information 4 7 5 XX Y M X 1 2 3 XX : Identification code (See Appendix) Y : Year: 0-9 M : Month: A~L Appendix Output version ADJ 3.3V X : Blank: normal L: Lead Free Package Part Number AP1621A AP1621B EU EX EZ ET SOT23-5L Anachip Corp. www.anachip.com.tw Rev. 1.2 Dec 23, 2004 4/5 AP1621 PWM/PFM Dual Mode Step-down DC/DC Controller Package Information Package Type: SOT23-5L D e1 1(4x) 4 5 E1 E A 0.10 C 5x A2 Seating Plane A1 1 2 2(4x) 3 b e With Plating b1 C C1 Gauge Plane 0.25 mm Base Metal L b Symbol A A1 A2 b b1 c c1 D E E1 L L1 e e1 1 2 L1 Dimensions In Millimeters Min. Nom. Max. 1.05 1.20 1.35 0.05 0.10 0.15 1.00 1.10 1.20 0.25 0.55 0.25 0.40 0.45 0.08 0.20 0.08 0.11 0.15 2.70 2.85 3.00 2.60 2.80 3.00 1.50 1.60 1.70 0.35 0.45 0.55 0.60 Ref. 0.95 Bsc. 1.90 Bsc. o o o 0 5 10 o o o 3 5 7 6o 8o 10o Anachip Corp. www.anachip.com.tw Dimensions In Inches Min. Nom. Max. 0.041 0.047 0.053 0.002 0.004 0.006 0.039 0.043 0.047 0.010 0.022 0.010 0.016 0.018 0.003 0.008 0.003 0.004 0.006 0.106 0.112 0.118 0.102 0.110 0.118 0.059 0.063 0.067 0.014 0.018 0.022 0.024 Ref. 0.037 Bsc. 0.075 Bsc. o o o 0 5 10 o o o 3 5 7 6o 8o 10o Rev. 1.2 Dec 23, 2004 5/5