Advanced Power Electronics Corp. APE1802 TYPICAL APPLICATION PACKAGE ORDERING INFORMATION PWM CONTROL 3.5A STEP-DOWN CONVERTER APE1802X

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1 PWM CONTROL 3.5A STEPDOWN CONVERTER FEATURES Input voltage:3.6v to 3V Output voltage:0.8v to Vcc Duty ratio:0% to 00% PWM control Oscillation frequency:330khz typ. Current Limit(CL), Enable function. Thermal Shutdown function. Short Circuit Protect (SCP). Builtin internal Pchannel MOS. SOP8L PbFree package. DESCRIPTION consists of stepdown switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. provides lowripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 00%. 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 Pchannel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as stepdown switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP8L package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 3V, it is also suitable for the operation via an AC adapter. TYPICAL APPLICATION VIN+V R4 00K ON/OFF FB VSS 8 C 470uF C3 0.uF R3.5K C6 0.uF EN VSS 7 3 OCSET 6 4 VCC 5 R VOUT = VFB x ( + ) R VFB = 0.8V ; R suggest 0.8K ~ 6k L uh R 30K D B340 R C nf VOUT = 5V/3.5A C8 0.uF C4 470uF L recommend value (V IN =V ) V OUT.8 V.5V 3.3V 5V I OUT =3.5A uh 5uH 8uH uh PACKAGE ORDERING INFORMATION X Package Type M : SOP8 Data and specifications subject to change without notice

2 ABSOLUTE MAXIMUM RATINGS (at T A =5 C) V CC PIN Voltage(V CC ) VSS 0.3 to VSS + 5V Feedback PIN Voltage(V FB ) V SS 0.3V to V CC ON/OFF PIN Voltage(V EN ) V SS 0.3V to V CC + 0.3V Switch PIN Voltage(V ) V SS 0.3V to V CC + 0.3V Power Dissipation(P D ) Internally Limited Storage Temperature Range(T ST ) 40 C To 50 C Operating Temperature Range(T OP ) 0 C To 5 C Operating Supply Voltage(VOP) +3.6V to +3V Output Current (I OUT ) 0 to 3.5A Peak Current (I peak ) 6A Thermal Resistance from Junction to Case(Rth JC ) 5 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 pins) of approx. in (multilayers) PACKAGE INFORMATION ( Top View ) FB 8 Vss EN Ocset Vss Vcc 4 5 SOP 8L ELECTRICAL SPECIFICATIONS (V IN =V, T A =5, unless otherwise specified) Parameter SYM TEST CONDITION MIN TYP MAX UNITS Feedback Voltage V FB I OUT =0.A V Quiescent Current I CCQ V FB =.V force driver off 3 5 ma Feedback Bias Current I FB I OUT =0.A ua Shutdown Supply Current I SD V EN =0V 0 ua OCSET pin bias current I OCSET ua Switch Current I 45 A Line Regulation V OUT /V OUT V CC = 8V~3V, I OUT =0.A % Load Regulation V OUT /V OUT I OUT = 0.A to 3.5A % Oscillation Frequency F OSC PIN KHz

3 ELECTRICAL SPECIFICATIONS(Cont.) EN PIN Logic Input Threshold Voltag EN PIN Input Current V SH I SH High (regulator ON) V EN =.5V(ON) 0 V ua V SL I SL Low (regulator OFF) V EN =0.3V(OFF) V ua Internal MOSFET R DS(ON) R DS(ON) V CC =5V, V FB =0V V CC =V, V FB =0V mω Efficiency EFFI V CC =V I OUT =A 9 V OUT =5V I OUT =3.5A 90 % PIN DESCRIPTIONS PIN SYMBOL V SS FB EN OCSET V CC PIN DESCRIPTION GND Pin Feedback Pin Power Off Pin H : Normal Operation(Stepdown) L : Stepdown Operation Stopped (All circuits deactivated) Add an external resistor to set max switch output current. Switch Pin. Connect External Inductor & Diode here. IC Power Supply Pin BLOCK DIAGRAM Vcc Oscillation Circuit Reference Voltage Thermal Shutdown PWMSwitched Control Circuit V EN 0uA + FB Vss EN OCSET 3

4 FUNCTION PIN DESCRIPTION PWM CONTROL The consists of DC/DC converters that employ a pulsewidth modulation (PWM) system. In converters of the, the pulse width varies in a range from 0 to 00%, 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 lowripple 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 0uA sink current crossing the resistor sets the voltage at pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an overcurrent condition is triggered. Please refer to the formula for setting the current limit value: IOCSET R (Normally, The I (MAX) setting more than I OUT.0A ). Example: I = (0u x.5k )/ 55m= 4.75A (Vin=V) I = (0u x.7k )/ 80m= 4.7A RDS(ON) SETTING THE OUTPUT VOLTAGE I (MIN) = (Vin=5V) Application circuit item shows the basic application circuit with APE803 adjustable output version. The external resistor sets the output according to the following equation : V OUT = 0.8V x (+R/R) Table Resistor select for output voltage setting V OUT R R 5V 3.3V.5V.3K.5K.K 6.8K 4.7K 4.7K 30K 8K K.8V K.5K.5V.K K.V 3K.5K.0V 3K 0.75K R setting 5.6k that System Operation Current (No load) can be reducing to under 4mA. VIN>+9V R4 00K ON/OFF FB VSS 8 C 470uF C3 0.uF R3.5K C6 0.uF EN VSS 7 3 OCSET 6 4 VCC 5 L uh R 30K D B340 R C nf VOUT = 5V/3.5A C8 0.uF C4 470uF 4

5 PCB LAYOUT GUIDE If you need low T C & T J or large PD(Power Dissipation), The dual pins (5 & 6) on the SOP8L package are internally connected to die pad, The PCB layout should allow for maximum possible copper area at the pins.. Connect C3 to VCC PIN as closely as possible to get good power filter effect.. Connect R3 to VCC PIN as closely as possible. 3. Connect ground side of the C & D as closely as possible. 5

6 TYPICAL CHARACTERISTICS VFB VS VIN ICCQ VS VIN 0.80 VFB VS VIN 6.0 ICCQ VS VIN VFB (V) ICCQ (ma) Vin (V) Vin (V) FOSC VS VIN FOSC VS TEMPERATURE FOSC VS VIN Fosc vs Temperature FOSC (KHz) Fosc(KHz) Vin (V) Temp ( ) VFB VS TEMPERATURE ICCQ VS TEMPERATURE VFB vs temperature Iccq vs Temperature VFB(V) ICCQ(mA) Temp ( ) Temp ( ). 6

7 TYPICAL CHARACTERISTICS Output Ripple (V IN =V, V OUT =5V, I OUT =3A) Power on test wave (V IN =V, V OUT =5V, I OUT =3A ) V OUT (AC) V OUT V IN I I Load Transient Response (V IN =V, V OUT =5V, I OUT =0.~3A) EN PIN on test wave (V IN =V, V OUT =5V, I OUT =3A ) V OUT V OUT V OUT (AC) V IN I I Efficiency(%) 00% 90% 80% 70% 60% 50% 40% 30% 0% 0% 0% Efficiency (V IN =V, V OUT =5V) VOUT=5V Iout(A) Efficiency(%) 00% 90% 80% 70% 60% 50% 40% 30% 0% 0% 0% Efficiency (V IN =V, V OUT =3.3V) VOUT=3.3V Iout(A). 7

8 Package Outline : SO8 ADVANCED POWER ELECTRONICS CORP. D Millimeters SYMBOLS MIN NOM MAX A A E E B c D E E e B e.7 TYP G 0.54 TYP L α A A G.All Dimension Are In Millimeters..Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : SO8 Part Number 80M YWWSSS Package Code Date Code (YWWSSS) Y:Last Digit Of The Year WW:Week SSS:Sequence 8