Advanced Power Electronics Corp. APE1802 PWM CONTROL 3.5A STEP-DOWN CONVERTER FEATURES DESCRIPTION APE1802 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. APE1802 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an 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 23V, it is also suitable for the operation via an AC adapter. Input voltage：3.6V to 23V Output voltage：0.8V to Vcc Duty ratio：0% to 100% PWM control Oscillation frequency：330KHz typ. Current Limit(CL), Enable function. Thermal Shutdown function. Short Circuit Protect (SCP). Built-in internal SW P-channel MOS. SOP-8L Pb-Free package. TYPICAL APPLICATION VIN+12V R4 100K C2 C3 470uF 0.1uF 1 FB ON/OFF APE1802 VSS 2 EN R3 1.5K C6 0.1uF 8 VSS 7 3 OCSET SW 6 4 VCC SW 5 1 L1 VOUT = 5V/3.5A 2 22uH R1 30K D1 B340 C1 1nF C8 0.1uF C4 470uF R2 5.6K VOUT = VFB x (1 + R1 ) R2 VFB = 0.8V ; R2 suggest 0.8K ~ 6k L1 recommend value (VIN=12V ) VOUT 1.8 V 2.5V 3.3V 5V IOUT=3.5A 12uH 15uH 18uH 22uH PACKAGE ORDERING INFORMATION APE1802X Package Type M : SOP-8 Data and specifications subject to change without notice 1 200808292 Advanced Power Electronics Corp. APE1802 ABSOLUTE MAXIMUM RATINGS (at T =25°C) A VCC PIN Voltage(VCC) -------------------------------------- VSS - 0.3 to VSS + 25V Feedback PIN Voltage(V FB) ------------------------------ VSS -0.3V to VCC ON/OFF PIN Voltage(VEN) ------------------------------- VSS -0.3V to VCC + 0.3V Switch PIN Voltage(VSW ) ---------------------------------- VSS -0.3V to VCC + 0.3V Power Dissipation(PD) ------------------------------------- Internally Limited Storage Temperature Range(T ST) --------------------- -40°C To 150°C Operating Temperature Range(T OP) ------------------ -20°C To 125°C Operating Supply Voltage(VOP) ------------------------ +3.6V to +23V Output Current (I OUT) -------------------------------------- 0 to 3.5A Peak Current (I peak) ---------------------------------------- 6A Thermal Resistance from Junction to Case(Rth JC) 25°C/W Thermal Resistance from Junction to Ambient(Rth JA) 70°C/W Note. Rth JA is measured with the PCB copper area(need connect to SW pins) of approx. 1 in 2 (multi-layers) PACKAGE INFORMATION ( Top View ) 8 Vss 7 Vss 3 6 SW 4 5 SW FB 1 EN 2 Ocset Vcc APE1802 SOP–8L ELECTRICAL SPECIFICATIONS (VIN=12V, TA=25℃, unless otherwise specified) Parameter SYM TEST CONDITION MIN TYP MAX UNITS Feedback Voltage VFB IOUT=0.1A 0.784 0.8 0.816 V 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 95 110 140 uA ISW 45 - - A % OCSET pin bias current Switch Current Line Regulation Load Regulation Oscillation Frequency △VOUT/VOUT VCC= 8V~23V, IOUT=0.2A △VOUT/VOUT IOUT= 0.1A to 3.5A FOSC SW PIN - 1 2 - 0.2 0.5 % 260 330 400 KHz 2 Advanced Power Electronics Corp. APE1802 ELECTRICAL SPECIFICATIONS(Cont.) EN PIN Logic Input Threshold Voltag EN PIN Input Current Internal MOSFET RDS(ON) VSH High (regulator ON) 2 VSL Low (regulator OFF) ISH VEN=2.5V(ON) ISL RDS(ON) EFFI Efficiency - - - - 0.8 V - 20 - uA VEN=0.3V(OFF) - -10 - uA VCC=5V, VFB=0V - 80 140 VCC=12V, VFB=0V - 55 90 VCC=12V VOUT=5V IOUT=2A 92 - IOUT=3.5A 90 - V mΩ % PIN DESCRIPTIONS PIN SYMBOL VSS PIN DESCRIPTION GND Pin Feedback Pin FB Power -Off Pin H : Normal Operation(Step-down) EN L : Step-down Operation Stopped (All circuits deactivated) OCSET Add an external resistor to set max switch output current. SW Switch Pin. Connect External Inductor & Diode here. VCC IC Power Supply Pin BLOCK DIAGRAM SW Oscillation Circuit Reference Voltage Vcc + PWM - Switched Control Circuit - Thermal Shutdown FB Vss 110uA VEN EN OCSET 3 Advanced Power Electronics Corp. APE1802 FUNCTION PIN DESCRIPTION PWM CONTROL The APE1802 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the APE1802, 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: I ISW(MIN) = OCSET × R3 + 0.08 R DS(ON) (Normally, The ISW(MAX) setting more than IOUT 1.0A ). Example: ISW = (110u x 1.5K + 0.08)/ 55m= 4.75A (Vin=12V) ISW = (110u x 2.7K + 0.08)/ 80m= 4.7A (Vin=5V) SETTING THE OUTPUT VOLTAGE Application circuit item shows the basic application circuit with APE1803 adjustable output version. The external resistor sets the output according to the following equation : V OUT = 0.8V x (1+R1/R2) Table1 Resistor select for output voltage setting VOUT 5V 3.3V 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 2K 1.2V 3K 1.5K 1.0V 3K 0.75K 2.5V R2 setting 5.6k that System Operation Current (No load) can be reducing to under 4mA. VIN>+9V C2 C3 470uF 0.1uF R4 100K ON/OFF R3 1.5K C6 0.1uF APE1802 1 FB VSS 8 2 EN VSS 7 3 OCSET SW 6 4 VCC SW 5 L1 2 22uH R1 30K D1 B340 VOUT = 5V/3.5A 1 C1 1nF C8 0.1uF C4 470uF R2 5.6K 4 Advanced Power Electronics Corp. APE1802 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 Advanced Power Electronics Corp. APE1802 TYPICAL CHARACTERISTICS VFB VS VIN ICCQ VS VIN ICCQ VS VIN VFB VS VIN 0.820 6.0 0.816 5.0 0.812 4.0 0.804 ICCQ (mA) VFB (V) 0.808 0.800 0.796 3.0 2.0 0.792 0.788 1.0 0.784 0.780 0.0 4 6 8 10 12 14 16 18 20 22 24 4 6 8 10 12 14 Vin (V) Vin (V) FOSC VS VIN 20 22 24 Fosc vs Temperature FOSC VS VIN 360.0 350.0 350.0 340.0 340.0 330.0 Fosc(KHz) FOSC (KHz) 18 FOSC VS TEMPERATURE 360.0 320.0 310.0 330.0 320.0 310.0 300.0 300.0 290.0 290.0 280.0 280.0 4 6 8 -20 10 12 14 16 18 20 22 24 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) 16 0.800 0.795 4.0 3.0 2.0 0.790 1.0 0.785 0.0 0.780 -20 0 20 40 60 80 -20 100 120 0 20 40 60 80 100 120 Temp (℃ ) Temp (℃ ) 6 . Advanced Power Electronics Corp. APE1802 TYPICAL CHARACTERISTICS Output Ripple Power on test wave (VIN=12V, VOUT=5V, IOUT=3A) (VIN=12V, VOUT=5V, IOUT=3A ) VOUT VOUT (AC) SW VIN SW ISW ISW Load Transient Response EN PIN on test wave (VIN=12V, VOUT=5V, IOUT=0.1~3A) (VIN=12V, VOUT=5V, IOUT=3A ) VOUT VOUT VOUT (AC) SW VIN SW ISW ISW Efficiency Efficiency (VIN=12V, VOUT=5V) (VIN=12V, VOUT=3.3V) VOUT=3.3V 100% 90% 90% 80% 80% 70% 70% Efficiency(%) Efficiency(%) VOUT=5V 100% 60% 50% 40% 60% 50% 40% 30% 30% 20% 20% 10% 10% 0% 0% 0.0 1.0 2.0 0.0 3.0 1.0 2.0 3.0 Iout(A) Iout(A) 7 . ADVANCED POWER ELECTRONICS CORP. Package Outline : SO-8 D Millimeters 8 7 6 5 E1 1 2 3 4 e B E SYMBOLS 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 E 5.80 6.15 6.50 E1 3.80 3.90 4.00 e 1.27 TYP G 0.254 TYP L 0.38 － 0.90 α 0.00 4.00 8.00 A A1 G 1.All Dimension Are In Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : SO-8 Part Number 1802M YWWSSS Package Code Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 8