AP1625 PWM/PFM Dual Mode Step-down DC/DC Controller Features General Descriptions - Input voltage range:2.2V~8V（VOUT type） - Adjustable version（±2.5%） - Oscillator frequency: 270KHz（±15%） - High Efficiency: 92%（typ .） - Stand-by capability: ISTB＝3µA.（max .） - Soft-start time set-up externally type possible - Output voltage type possible（FB） - Package: SOT23-5 The AP1625 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 270KHz switching frequency, the size of the external components can be reduced. Control switches from PWM to PFM during light loads with the AP1625（PWM/PFM switchable）and the series is highly efficient from light loads to large output currents. In relation to soft-start time external capacitor regulated types. During stand-by time （CE pin “LOW”）,current consumption is reduced to less than 0.5µA. 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 (Top View) FB CE 5 4 1 2 3 VOUT VDD GND Pin No. Pin Name Function 1 V OUT External PMOSFET Connection 2 V DD 3 GND Ground Power Supply 4 CE Chip Enable Soft-start capacitor connection 5 FB Feedback pin 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.1.1 May.27, 2004 1/5 AP1625 PWM/PFM Dual Mode Step-down DC/DC Controller Ordering Information AP1625 X X X Package W : SOT23-5 Packing Lead Free Blank : Normal A : Taping L : Lead Free Package Block Diagrams FB VDD Phase Compensation + + - - Vref with Soft Start CE CE PWM/PFM Controller Buffer, Driver Vout PWM Comparator Ramp Wave Generator, OSC GND Absolute Maximum Ratings Ta=25°C 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 ~ 8.5 -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.1.1 May.27, 2004 2/5 AP1625 PWM/PFM Dual Mode Step-down DC/DC Controller Electrical Characteristics AP1625 （VOUT＝3.3V, FOSC＝270KHz） Parameter Symbol FB Maximum Input Voltage UVLO Voltage（min. operating voltage） VFB VIN Ta=25°C Conditions Min. Typ. Max. 1.17 8 1.2 1.23 Unit V V Same as IDD, voltage required to 2.2 V maintain H at VOUT No external components, 40 110 µA Supply Current IDD CE=VIN, VOUT=0V No external components, Stand-by Current ISTB 2 µA CE=VIN, VOUT=0V Measuring of EXT/waveform, Oscillator Frequency Fosc 230 270 310 KHz VIN=output voltage+0.3V Maximum Duty Ratio MAXDTY 100 % PFM Duty Ratio PFMDTY NO load (AP1625 only) 15 25 35 % NO external components, VFB=0V, apply 0.65V (min.) to CE,determine 0.5 CE”High” Voltage VCEH Vcc VOUT”Low” determine Same as VCEH, 0.20 V CE”Low” Voltage VCEL EXT/”High” Efficiency EFFI 92 % Soft-Start Time Tss Use a 33 nF Capacitor 5 15 msec Measuring conditions: Unless otherwise specified, connect external components. VIN=5.0V,LOUT=220mA Series Amendment: AP1625 External Components: Css ＝0.033µF, Rss＝470kΩ The Following Parameter Applies: Soft Start Time（Tss）:Connect Rss,CSS. CE,0V→3.0V（When VIN<3.0V, VIN＝3.0V） VUVLO Anachip Corp. www.anachip.com.tw Rev.1.1 May.27, 2004 3/5 AP1625 PWM/PFM Dual Mode Step-down DC/DC Controller Typical Application Circuit AP1625 L PMOS RSS VIN VDD +CIN CFB VOUT SD CE VOUT RFB1 +CL FB GND CSS RFB2 RL Marking Information SOT23-5L 4 XX Y M X 1 Appendix 7 5 2 3 XX : Identification code (See Appendix) Y : Year: 0-9 M : Month: A~L Part Number Package AP1625 SOT23-5 Identification Code EW X : Blank: normal L: Lead Free Package SOT23-5L Anachip Corp. www.anachip.com.tw Rev.1.1 May.27, 2004 4/5 AP1625 PWM/PFM Dual Mode Step-down DC/DC Controller Package Information Package Type: SOT23-5L D e1 θ 1(4x) 4 5 E1 E A 0.10 C 5x A2 Seating Plane A1 1 2 θ 2(4x) 3 b e With Plating b1 C C1 Gauge Plane 0.25 mm θ Base Metal L b Symbol A A1 A2 b b1 c c1 D E E1 L L1 e e1 θ θ1 θ2 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. 5o 10o 0o o o 5 7o 3 o o 6 8 10o 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. 0o 5o 10o o o 3 5 7o o o 6 8 10o Anachip Corp. www.anachip.com.tw Rev.1.1 May.27, 2004 5/5