Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter FEATURES APE1801 GENERAL DESCRIPTION APE1801 consists of step-down switching regulator with PWM control. These - Input voltage：3.6V to 20V - Output voltage：0.8V to Vcc devise include a reference voltage source, oscillation circuit, error amplifier, - Duty ratio：0% to 100% PWM control internal PMOS and etc. - Oscillation frequency：330KHz typ. - Soft-Start(SS), Current Limit(CL), Enable function. characteristics. The PWM control circuit is able to vary the duty ratio linearly - Thermal Shutdown function. from 0 up to 100%. This converter also contains an error amplifier circuit as well - Short Circuit Protect (SCP). as a soft-start circuit that prevents overshoot at startup. An enable function, an - Built-in internal SW P-channel MOS. over current protect function and short circuit protect function are built inside, and - SOP-8L Pb-Free package. when OCP or SCP happens, the operation frequency will be reduced. Also, an APE1801 provides low-ripple power, high efficiency, and excellent transient internal compensation block is built in to minimum external component count. 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 package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 20V, it is also suitable for the operation via an AC adapter. This datasheet contains new product information. Advanced Power Electronics 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. 200726073-1/7 Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter APE1801 Block Diagram SW Oscillation Circuit Reference Voltage Source with Soft Start Vcc + PWM - Switched Control Circuit - FB Thermal Shutdown Vss 110uA VEN EN OCSET PIN ASSIGNMENT The package of APE1801 is SOP-8L; the pin assignment is given by: Name Description FB Feedback pin Power-off pin H：normal operation(Step-down) L：Step-down operation stopped (All circuits deactivated) Add an external resistor to set max switch output current. ( Top View ) 8 Vss 7 Vss 3 6 SW 4 5 SW FB 1 EN 2 Ocset Vcc APE1801 SOP–8L EN OCSET VCC SW VSS IC power supply pin Switch pin. Connect inductor & diode here. GND pin external ORDER/MARKING INFORMATION Order Information APE1801 X Package Type M : SOP-8L Top Marking 1801M YWWXXX Part number ID code: internal WW: 01~52 Year : 7 = 2007 2/7 Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter APE1801 Absolute Maximum Ratings (at Ta=25℃) Characteristics Symbol Rating Unit VCC Pin Voltage VCC VSS - 0.3 to VSS + 22 V Feedback Pin Voltage VFB VSS - 0.3 to VCC V ON/OFF Pin Voltage VEN VSS - 0.3 to VCC + 0.3 V Switch Pin Voltage VSW VSS - 0.3 to VCC + 0.3 V Power Dissipation PD Internally limited mW Storage Temperature Range TST -40 to +150 ℃ Operating Temperature Range TOP -20 to +125 ℃ Operating Supply Voltage VOP +3.6 to +20 V Thermal Resistance from Junction to case θJC 25 ℃/W Thermal Resistance from Junction to ambient θJA 70 ℃/W Note : θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer). Electrical Characteristics (VIN = 12V, Ta=25℃, unless otherwise specified) Characteristics Symbol Conditions Min Typ Max Units Feedback Voltage VFB IOUT=0.1A Quiescent Current ICCQ VFB=1.2V force driver off - 3 5 mA Feedback Bias Current IFB IOUT=0.1A - 0.1 0.5 uA Shutdown Supply Current ISD VEN =0V - 2 10 uA IOCSET 95 110 125 uA ISW 3.0 - - A OCSET pin bias current Switch Current 0.784 0.800 0.816 V Line Regulation △VOUT/VOUT VCC = 5V~20V, IOUT=0.2A - 1 2 % Load Regulation △VOUT/VOUT IOUT = 0.1 to 2A - 0.2 0.5 % KHz Oscillation Frequency EN Pin Logic input threshold voltage EN Pin Input Current Soft-Start Time FOSC SW pin 260 330 400 VSH High (regulator ON) 2.0 - - VSL Low (regulator OFF) - - 0.8 ISH VEN=2.5V (ON) - 20 - uA ISL VEN=0.3V (OFF) - -10 - uA 0.3 4 8 ms VCC=5V, VFB=0V - 100 140 VCC=12V, VFB=0V - 70 100 TSS Internal MOSFET RDSON RDSON Efficiency EFFI VCC = 12V, IOUT = 1A VOUT = 5V IOUT = 2A - 92 92 - V mΩ % 3/7 Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter APE1801 Application Circuit VIN+12V R4 100K ON/OFF 1 2 C2 470uF C3 0.1uF R3 1.3K 3 4 APE1801 FB VSS EN VSS OCSET SW VCC SW 8 7 6 L1 1 33uH 5 D1 B340 VOUT = VFB x (1 + VOUT = 5V/2A 2 R1 30K C1 1nF C8 0.1uF C4 470uF R2 5.6K R1 ) R2 VFB = 0.8V ; R2 suggest 0.8K ~ 6k L1 recommend value (VIN=12V ,IOUT=2A,) VOUT 1.8 V 2.5V 3.3V 5V L1 Value 18uH 22uH 27uH 33uH Function Descriptions PWM Control The APE1801 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the APE1801, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. RDS(ON) Current Limiting The current limit threshold is setting by the external resistor (R3) connecting from VCC supply to OCSET pin. The internal 110uA sink current crossing the resistor sets the voltage at pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an over-current condition is triggered. Please refer to the formula for setting the current limit value IOCSET × R3 + 0.08 = ISW(MAX) R DS(ON) ( Normally, The ISW(MAX) setting more than IOUT 1.0A ). Example: ISW = (110uA x 1.3k + 0.08)/ 70mΩ= 3.2A ISW = (0.11 x 1.3 + 0.08)/ 0.07= 3.2A 4/7 Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter APE1801 Setting the Output Voltage Application circuit item shows the basic application circuit with APE1801 adjustable output version. The external resistor sets the output voltage according to the following equation: R1 ⎞ ⎛ V OUT = 0.8V × ⎜⎝1 + R2 ⎟⎠ Table 1 Resistor select for output voltage setting VOUT R2 R1 1.3K 6.8K 5.6K 30K 1.5K 4.7K 5.6K 18K 2.2K 4.7K 5.6K 12K 1.8V 2K 2.5K 1.5V 2.2K 2.0K 1.2V 3K 1.5K 5V 3.3V 2.5V R2 setting 5.6k that system operation current (No load) can be reduce to under 4mA. VIN>+9V C2 C3 470uF 0.1uF R4 100K R3 1.3K ON/OFF APE1801 1 FB VSS 8 2 EN VSS 7 3 OCSET SW 6 4 VCC SW 5 1 L1 VOUT = 5V/2A 2 33uH R1 30K D1 B340 C1 1nF C8 0.1uF C4 470uF R2 5.6K PCB Layout Guide If you need low Tc & Tj or large PD(Power Dissipation), The dual SW pins(5&6) on the SOP-8L package are internally connected to die pad, The PCB layout should allow for maximum possible copper area at the SW pins. 1. Connect C3 to VCC pin as closely as possible to get good power filter effect. 2. Connect R3 to VCC pin as closely as possible. 3. Connect ground side of the C2 & D1 as closely as possible. 5/7 Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter APE1801 Typical Characteristics VFB VS VIN ICCQ VS VIN ICCQ VS VIN VFB VS VIN 0.820 6.0 0.815 5.0 ICCQ(mA) 0.810 VFB(V) 0.805 0.800 0.795 4.0 3.0 2.0 0.790 1.0 0.785 0.0 0.780 3 5 7 9 11 13 15 Vin(V) 17 19 3 21 7 9 13 15 17 19 FOSC VS VIN FOSC VS TEMPERATURE FOSC VS VIN Fosc vs Temperature 21 360.0 350.0 340.0 340.0 330.0 330.0 Fosc(KHz) 350.0 320.0 310.0 320.0 310.0 300.0 300.0 290.0 290.0 280.0 280.0 3 5 7 9 11 13 15 17 19 -20 21 0 20 Vin(V) 40 60 80 100 120 Temp (℃ ) VFB VS TEMPERATURE ICCQ VS TEMPERATURE Iccq vs Temperature VFB vs temperature 6.0 0.820 0.815 5.0 ICCQ(mA) 0.810 0.805 VFB(V) 11 Vin(V) 360.0 Fosc(KHz) 5 0.800 0.795 0.790 4.0 3.0 2.0 1.0 0.785 0.0 0.780 -20 0 20 40 60 Temp ( ℃ ) 80 100 120 -20 0 20 40 60 80 100 120 Temp ( ℃ ) 6/7 Advanced Power Electronics Corp. PWM Control 2A Step-Down Converter APE1801 Typical Characteristics Output Ripple Power on test wave (VIN=12V, VOUT=5V, IOUT=2A) (VIN=12V, VOUT=5V, IOUT=2A ) VOUT VOUT(AC) VIN SW SW ISW ISW Load Transient Response EN PIN on test wave (VIN=12V, VOUT=5V, IOUT=0.1~2A) (VIN=12V, VOUT=5V, IOUT=2A ) VOUT VOUT VOUT(AC) SW VIN SW ISW ISW Efficiency Efficiency (VIN=12V, VOUT=5V/3.3V) (VIN=5V, VOUT=3.3V/2.5V) VIN=5V 100% 90% 90% 80% 80% 70% 70% Efficiency(%) Efficiency(%) VIN=12V 100% 60% 50% 40% 30% 20% 50% 40% Vout=5V 30% Vout=3.3V 20% 10% 0% 0.0 60% Vout=2.5V VIN=3.3V 10% 0.5 1.0 Iout(A) 1.5 2.0 0% 0.0 0.5 1.0 1.5 2.0 Iout (A) 7/7 ADVANCED POWER ELECTRONICS CORP. Package Outline : SOP-8L D 8 7 Millimeters 6 2 3 MIN NOM MAX A 1.35 1.55 1.75 A1 0.10 0.18 0.25 B 0.33 0.41 0.51 C 0.19 0.22 0.25 D 4.80 4.90 5.00 E1 3.80 3.90 4.00 E 5.80 6.15 6.50 L 0.38 0.71 1.27 θ 0 4.00 8.00 5 E1 1 SYMBOLS E 4 e e B 1.27 TYP A A1 DETAIL A L 1.All Dimension Are In Millimeters. 2.Dimension Does Not Include Mold Protrusions. c DETAIL A Part Marking Information & Packing : SOP-8L Part Number Package Code 1801M YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence θ