AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Features General Descriptions - 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 - Pb-Free Package: SOT23-5, SON-6(3×3×0.8mm) 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. Applications 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. ● Electronic Information Organizers ● Palmtops ● Cellular and portable phones ● Portable Audio Systems ● Various Multi-function Power Supplies 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. Pin Assignment Pin Descriptions (Top View) Pin Name CE/SS 4 FB 5 VOUT VCC GND CE/SS FB SVCC AP1604A 1 VOUT 2 GND Function Output Voltage Input Supply Ground Chip Enable / Soft Start Feedback pin Signal Power for SON only 3 VCC SOT23-5 FB 1 6 V OUT SVCC 2 5 VCC CE 3 4 GND SON-6 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 Jun. 27, 2005 1/7 AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Ordering Information AP1604 X X X Version A: AP1604A Packing Package A : Taping W: SOT23-5 SN: SON-6 (3*3*0.8mm) Block Diagrams SVCC FB VCC Phase Compensation + - + ERR AMP VOUT - Soft Start Vref with CE CE/SS Current Limit PWM/PFM Controller PWM Comparator Ramp Wave Generator, OSC GND Absolute Maximum Ratings Symbol Parameter Ratings Ta=25°C Units 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 V V V V Pd Continuous Total Power Dissipation Internal limited Topr Operating Ambient Temperature -25 ~ +80 °C Tstg Storage Temperature -40 ~ +125 °C Anachip Corp. www.anachip.com.tw Rev.1.1 Jun. 27, 2005 2/7 AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Electrical Characteristics VIN=5V, VOUT＝2V, Load=300mA, Ta=25°C Sym. VFB VIN Parameter Conditions FB Input Voltage Line Regulation Load Regulation UVLO Voltage（min. operating voltage） Operating Current 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 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 Typical Performance Characteristics Vcc v.s. Quiescent Current 200 200 180 180 160 160 Quiescent Current (uA) Operating Current (uA) Vcc v.s. 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 Vcc (V) 3 3.5 4 4.5 5 5.5 Vcc (V) Anachip Corp. www.anachip.com.tw Rev.1.1 Jun. 27, 2005 3/7 AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Typical Performance Characteristics (Continued) Vcc v.s. Frequency 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 700 680 660 Frequency (KHz) Stand-by Current (uA) Vcc v.s. Stand-by Current 640 620 600 580 560 540 520 500 2.5 3 3.5 4 4.5 5 5.5 2.5 3 3.5 Vcc (V) Vcc v.s. Current Limit 5 5.5 4.5 5 5.5 700 800 600 1.3 500 1.1 RDS(ON) (mΩ) 1.2 Current Limit (A) 4.5 Vcc v.s. RDS(ON) 1.4 Current Limit 1 0.9 0.8 0.7 400 300 200 100 0.6 Vout=2V 0 0.5 3 3.5 4 4.5 5 2.5 5.5 3 3.5 Vcc (V) Line Regulation 4 Vcc (V) Load Regulation 0.3 3 0.2 2 0.1 1 V / VOUT (%) V / VOUT (%) 4 Vcc (V) 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 Load (mA) 600 Anachip Corp. www.anachip.com.tw Rev.1.1 Jun. 27, 2005 4/7 AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Typical Application Circuit 2.2V ~ 5.5V VIN VOUT AP1604A 1MΩ CE/SS GND 0.1uF B240A R2 FB R1 10nF 0.1uF 68uF ~ 68uF 10uH VOUT VCC 100nF Vout = 1 × (1 + R2 R1 R1=100K ~ 200K ) Marking Information (1) SOT23-5L 4 XX : Identification code (See Appendix) Y : Year: 0-9 M : Month: A~L XX Y M 1 Appendix 7 5 2 Part Number Package AP1604A SOT23-5 Identification Code ER 3 SOT23-5L (2) SON-6L (3*3*0.8mm) XX XX Appendix Identification Code ( See the table ) Date Code Year: 0~9 Month: A~L Part Number Package Identification code AP1604A SON-6L (3*3*0.8mm) S4 Anachip Corp. www.anachip.com.tw Rev.1.1 Jun. 27, 2005 5/7 AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Package Information (1) Package Type: SOT23-5L D e1 θ 1(4x) 4 5 E1 A E 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 L1 Dimensions In Millimeters Min. Nom. Max. Dimensions In Inches Min. Nom. Max. A 1.05 1.20 1.35 0.041 0.047 0.053 A1 0.05 0.10 0.15 0.002 0.004 0.006 A2 1.00 1.10 1.20 0.039 0.043 0.047 b 0.25 - 0.55 0.010 - 0.022 b1 0.25 0.40 0.45 0.010 0.016 0.018 c 0.08 - 0.20 0.003 - 0.008 c1 0.08 0.11 0.15 0.003 0.004 0.006 D 2.70 2.85 3.00 0.106 0.112 0.118 E 2.60 2.80 3.00 0.102 0.110 0.118 E1 1.50 1.60 1.70 0.059 0.063 0.067 L 0.35 0.45 0.55 0.014 0.018 0.022 L1 0.60 Ref. 0.024 Ref. e 0.95 Bsc. 0.037 Bsc. e1 θ 1.90 Bsc. 0.075 Bsc. 0o 5o o o 10o o 0o 5o o o 10o θ1 3 5 7 3 5 7o θ2 6o 8o 10o 6o 8o 10o Anachip Corp. www.anachip.com.tw Rev.1.1 Jun. 27, 2005 6/7 AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Package Information (Continued) (2) SON-6L (3×3×0.8mm) C 0.25 L E1 2x Pin1 ID Area E 0.10 C SEATING PLANE Symbol A A1 A3 b D D1 E E1 L e e1 y Dimensions In Millimeters Min. Nom. Max. 0.70 0.75 0.80 0.00 0.02 0.05 0.203 REF. 0.30 0.40 0.45 2.90 3.00 3.10 1.90 2.10 2.30 2.90 3.00 3.10 1.30 1.50 1.70 0.30 0.40 0.50 0.95 BSC. 1.90 BSC. 0.00 0.08 Dimensions In Inches Min. Nom. Max. 0.028 0.030 0.031 0.000 0.001 0.002 0.008 REF 0.012 0.016 0.018 0.114 0.118 0.122 0.075 0.083 0.091 0.114 0.118 0.122 0.051 0.059 0.067 0.012 0.016 0.020 0.037 BSC. 0.075 BSC. 0.000 0.003 Anachip Corp. www.anachip.com.tw Rev.1.1 Jun. 27, 2005 7/7