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 SO-8 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. SO-8 Pb-Free Package. Halogen Free Product TYPICAL APPLICATION VIN+12V R4 100K APE1802 ON/OFF R3 1.5K C2 C3 470uF 0.1uF C6 0.1uF FB VSS EN VSS OCSET SW VCC SW L1 1 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 ( Top View ) APE1802X FB 1 8 Vss EN 2 7 Vss Ocset 3 6 SW Vcc 4 5 SW Package Type M : SO-8 SO-8 Data and specifications subject to change without notice 1 20130206V4.1 Advanced Power Electronics Corp. APE1802 ABSOLUTE MAXIMUM RATINGS (at TA=25°C) VCC PIN Voltage(VCC) ------------------------------------- VSS - 0.3 to VSS + 25V Feedback PIN Voltage(VFB) ----------------------------- 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 Junction Temperature Range(T J) -------- -20°C To 125°C Operating Supply Voltage(VOP) ------------------------- +3.6V to +23V Output Current (IOUT) -------------------------------------- 0 to 3.5A Peak Current (Ipeak) ---------------------------------------- 6A Thermal Resistance from Junction to Case(R thjc) 25°C/W Thermal Resistance from Junction to Ambient(R thja) 70°C/W Note. R thja is measured with the PCB copper area(need connect to SW pins) of approx. 1 in 2 (multi-layers) ELECTRICAL SPECIFICATIONS (VIN=12V, VOUT=3.3V, TA=25℃, unless otherwise specified) Parameter Feedback Voltage SYM VFB TEST CONDITION IOUT=0.1A Quiescent Current ICCQ MIN 0.784 TYP 0.8 MAX 0.816 UNITS V 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 OCSET Pin Bias Current IOCSET 110 130 150 uA ISW 4.5 - - A Line Regulation △VOUT/VOUT VCC = 8V~23V, IOUT=0.2A - 1 2 % Load Regulation △VOUT/VOUT IOUT = 0.1 to 3.5A - 0.2 0.5 % 260 330 400 KHz - - Switch Current Oscillation Frequency FOSC EN Pin Logic Input Threshold Voltage VSH Slew rate > 80mV/μs 2 VSL - - 0.8 ISH Slew rate > 80mV/μs VEN=2.5V (ON) - 20 - uA ISL VEN=0.3V (OFF) - -10 - uA VCC=5V, VFB=0V - 80 140 VCC=12V, VFB=0V - 55 90 EN Pin Input Current Internal MOSFET RDSON RDSON Efficiency EFFI SW pin VCC=12V, VOUT = 5V IOUT=2A IOUT=3.5A - 92 90 - V mΩ % 2 Advanced Power Electronics Corp. APE1802 PIN DESCRIPTIONS PIN SYMBOL VSS FB PIN DESCRIPTION GND Pin Feedback Pin Power -Off Pin EN H : Normal Operation(Step-down) 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 130uA 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: ISW(MIN) = IOCSET × R3 + 0.08 R DS(ON) (Normally, The ISW(MAX) setting more than IOUT 1.0A ). Example: ISW = (0.13mA x 1.5K + 0.08)/ 0.055= 5A (VIN=12V) ISW = (0.13mA x 2.7K + 0.08)/ 0.080= 5.39A (VIN=5V) SETTING THE OUTPUT VOLTAGE Application circuit item shows the basic application circuit with APE1802 adjustable output version. The external resistor sets the output voltage according to the following equation: V OUT R1 ⎞ ⎛ = 0.8V × ⎜1 + ⎟ ⎝ R2 ⎠ Table1 Resistor select for output voltage setting VOUT 5V 3.3V 2.5V 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 1.0V 3K 0.75K 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 APE1802 ON/OFF R3 1.5K C6 0.1uF FB VSS EN VSS OCSET SW VCC SW 1 L1 VOUT = 5V/3.5A 2 22uH R1 30K D1 B340 C1 1nF C8 0.1uF C4 470uF R2 5.6K 4 Advanced Power Electronics Corp. APE1802 PCB LAYOUT GUIDE If you need low Tc and Tj or large PD (Power Dissipation), the dual SW pins (5 and 6) on the SO8 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 and D1 as closely as possible. 5 Advanced Power Electronics Corp. APE1802 TYPICAL PERFORMANCE CHARACTERISTICS VFB VS VIN ICCQ VS VIN 0.820 6.0 0.816 5.0 0.812 0.808 4.0 ICCQ (mA) VFB (V) 0.804 0.800 0.796 0.792 0.788 3.0 2.0 1.0 0.784 0.780 0.0 4 6 8 10 12 14 16 18 20 22 24 4 6 8 10 Vin (V) 12 14 Vin (V) 16 18 20 80 100 22 24 Fosc vs Temperature FOSC VS VIN 360.0 360.0 350.0 350.0 340.0 330.0 Fosc(KHz) FOSC (KHz) 340.0 320.0 310.0 330.0 320.0 310.0 300.0 300.0 290.0 290.0 280.0 280.0 4 6 8 -20 10 12 14 16 18 20 22 24 0 20 60 120 Temp ( ℃ ) Vin (V) VFB vs temperature Iccq vs Temperature 0.820 6.0 0.815 5.0 ICCQ(mA) 0.810 0.805 VFB(V) 40 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 Temp (℃ ) 80 100 120 -20 0 20 40 60 80 100 120 Temp ( ℃ ) 6 EN PIN on test wave Advanced Power Electronics Corp. APE1802 TYPICAL PERFORMANCE CHARACTERISTICS Output Ripple (VIN=12V, VOUT=5V, IOUT=3A) Power on Test Wave (VIN=12V, VOUT=5V, IOUT=3A ) Load Transient Response (VIN=12V, VOUT=5V, IOUT=0.1~3A) EN PIN on test wave (VIN=12V, VOUT=5V, IOUT=3A ) Efficiency (VIN=12V, VOUT=5V) EN PIN on test wave (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 Iout(A) 3.0 0.0 1.0 2.0 3.0 Iout(A) 7 Advanced Power Electronics Corp. APE1802 MARKING INFORMATION SO-8 Part Number Package Code 1802M YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 8