Advanced Power Electronics Corp. APE1701 150KHz, 2A PWM BUCK DC/DC CONVERTER FEATURES DESCRIPTION Output Voltage : 3.3V, 5V, 12V and Adjustable Output Voltage Adjustable Version Output Voltage Range, 1.23V to 19.5V 150KHz Fixed Switching Frequency. Voltage Mode Non-synchronous PWM Control. Thermal-shutdown and Current-limit Protection. ON/OFF Shutdown Control Input. Short Circuit Protect(SCP) Operating Voltage can be up to 22V Output Load Current 2A SO-8 Package Low Power Standby Mode. Built-in Switching Transistor on Chip The APE1701 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. If current limit function occurs and VFB is down below 0.5V, the switching frequency will be reduced. The APE1701 series operates at a switching frequency of 150KHz thus allow smaller sized filter components than what would be needed with lower frequency switching regulators. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chips are available in a standard SO-8 package. RoHS Compliant TYPICAL APPLICATION 1. ADJUSTABLE OUTPUT VOLTAGE VERSION VIN=12V C2 0.1uF Vcc Vss SW Vss FB Vss EN Vss ON/OFF 2 33uH U1 C1 470uF Vout=5.0V/2A L1 1 D1 B340A R1 4.7K C3 470uF C6 0.1uF R2 1.5K APE1701 VOUT = VFB (1 + R1/R2 ) VFB = 1.23V R2 = 0.47K ~ 2.6K Table 1 Resistor select for output voltage setting VOUT 5V 3.3V R2 R1 1.5K 4.7K 1.8K 5.6K 1.5K 2.5K 1.8K 3.0K 2.5V 1.8K 1.8K 1.8V 1.8K 0.82K Data and specifications subject to change without notice 1 201207176 Advanced Power Electronics Corp. APE1701 TYPICAL APPLICATION 2. FIXED OUTPUT VOLTAGE VERSION VIN=12V 1 2 C1 470uF C2 0.1uF 3 4 Vout=3.3V/2A 2 33uH U1 1 L1 Vcc Vss SW Vss FB Vss EN 8 7 D1 B240A 6 C3 470uF C6 0.1uF 5 Vss APE1701-33 3. ADJUSTABLE OUTPUT VOLTAGE VERSION WITH DELAYED STARTUP VIN=12V L1 1 22uH U1 1 C1 470uF C2 0.1uF 2 C4 0.1uF 3 4 R3 100k Vout=2.5V/2A 2 Vcc Vss SW Vss FB Vss EN Vss R1 1.3K 8 7 D1 B240A 6 C3 470uF 5 C6 0.1uF R2 1.2K APE1701 ON/OFF VOUT = VFB (1 + R1/R2 ) VFB = 1.23V R2 = 0.47K ~ 2.6K 4. INVERTING -5V REGULATOR WITH DELAYED STARTUP VIN=5~20V 33uH 2A/30V 0.1uF 220uF 220uF 0.1uF 1 Vcc 2 SW 3 FB 4 EN 100k Vss 8 Vss 7 Vss Vss APE1701-50 6 5 100uF 0.1uF IN5400 3A/20V VOUT -5V200mA 2 Advanced Power Electronics Corp. APE1701 ABSOLUTE MAXIMUM RATINGS (at TA=25°C) Maximum Supply Voltage(VCC) -------------------------- +24V ON/OFF PIN Input Voltage(VEN) ------------------------ -0.3V to VCC Feedback PIN Voltage(VFB) ------------------------------ -0.3V to 16V Output Voltage to Ground(VOUT) ------------------------ -0.8V Power Dissipation(PD) ------------------------------------- (TJ-TA)/RthJA Storage Temperature Range(T ST) ---------------------- -65°C To 150°C Operating Temperature Range(T OP) ------------------- -20°C To 125°C Operating Supply Voltage(VOP) ------------------------- +4.5V to +22V Thermal Resistance from Junction to Case(Rth JC) 20°C/W Thermal Resistance from Junction to Ambient(RthJA) 60°C/W Note. RthJA is measured with the PCB copper area(need connect to VSS pins) of approximately 1.5 in2 (Multi-layer). ORDERING / PACKAGE INFORMATION (Top View) APE1701X - XX Package Type Vcc SW FB EN Output Voltage M : SO-8 Blank : ADJ 33 : 3.3V 50 : 5.0V 12 : 12V 1 2 3 4 8 7 6 5 Vss Vss Vss Vss SO-8 ELECTRICAL SPECIFICATIONS (Unless otherwise specified, T A=25oC, VCC=12V for 3.3V, 5V, adjustable version and V CC=18V for the 12V version. ILOAD = 0.2A) MIN TYP MAX UNITS Quiescent Current IQ VFB=12V force driver off - 4 8 mA Feedback Bias Current IFB VFB=1.3V(ADJ Version Only) - -10 -50 nA Shutdown Supply Current ISD VEN=5V, VCC=22V - 35 100 uA Current Limit ICL 2.4 - - A - 100 - % Parameter SYM Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Oscillation Frequency Oscillation Frequency of Short Circuit Protect SW PIN=-0.8V SW PIN Leakage Current Pear Current, No outside circuit VFB=0V force driver on VFB=0V force driver on VFB=12V force driver off - 0 - % 127 150 173 KHz (Adjustable) When VFB < 0.5V - 50 - KHz (Fixed) When < VOUT x 40% - 50 - KHz - 1.2 1.4 V - - -200 uA - -5 - mA FOSC FSCP VSAT Saturation Voltage SW PIN=0V DC TEST CONDITION IOUT=2A, No outside circuit VFB=0V force driver on No outside circuit ISWL VFB=12V force driver on VCC=22V force driver off 3 Advanced Power Electronics Corp. APE1701 ELECTRICAL SPECIFICATIONS(Cont.) Parameter SYM EN PIN Logic Input Threshold Voltage EN PIN Input Current Thermal Shutdown Temp. Version UNITS 0.6 V - V High (regulator OFF) 2 IH VEN=2.5V(OFF) - -0.1 -0.5 uA IL VEN=0.5V(ON) - - -0.01 uA - 135 - °C MIN TYP MAX UNITS 1.193 1.23 1.267 V - 79 - % 3.2 3.3 3.4 V - 80 - % 4.85 5.0 5.15 V - 84 - % 11.64 12 12.36 V - 90 - % TSD VFB Efficiency η Output Voltage VOUT Efficiency η Output Voltage VOUT Efficiency η Output Voltage VOUT Efficiency η APE1701-12V MAX VIH Output Feedback Voltage APE1701-5.0V TYP - Symbol APE1701-3.3V MIN Low (regulator ON) Characteristics APE1701-ADJ TEST CONDITION VIL Conditions 1.3 ILOAD =0.2A VOUT programmed for 3.3V VCC=12V, ILOAD=2A ILOAD =0.2A VCC=12V, ILOAD=2A ILOAD =0.2A VCC=12V, ILOAD=2A ILOAD =0.2A VCC=15V, ILOAD=2A PIN DESCRIPTIONS PIN SYMBOL VSS PIN DESCRIPTION GND Pin FB Control Voltage Feedback Control EN ON/OFF Shutdown SW Switching Output VCC IC Power Supply Pin 4 Advanced Power Electronics Corp. APE1701 BLOCK DIAGRAM EN 200mV V CC 220mV CURRENT SOURCE BIAS 1.235V REFERENCE 2.5V REGULATOR START UP + _ COMP. Current limit _ 150kHz OSC. FB COMP. + R2 + AMP _ + COMP. _ COMP. CONTROL + DRIVER R1 SWITCH SW Thermal Shutdown Vss ADJ : R2=0Ω, R1=OPEN FUNCTION DESCRIPTION VCC This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. VSS Circuit ground. SW Internal switch. The voltage at this pin switches between (+VCC – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT / VCC. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be minimized. FEEDBACK Senses the regulated output voltage to complete the feedback loop. EN Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 100uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of VCC) shuts the regulator down. If this shutdown feature is not needed, the EN pin can be wired to the ground pin. 5 Advanced Power Electronics Corp. APE1701 FUNCTION DESCRIPTION THERMAL CONSIDERATIONS The SO-8 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The APE1701 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the APE1701 (SO-8 package) operating as a buckswitching regulator in an ambient temperature of 25oC (still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures requires more heat sinker. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper (need connect to the VSS pins) should be used in the board layout, (One exception is the SW(switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature increments are all approximate. The increments are affected by a lot of factors. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. 6 Advanced Power Electronics Corp. APE1701 TYPICAL PERFORMANCE CHARACTERISTICS Iccq VS VIN 6.00 3.40 5.00 3.35 4.00 Iccq(mA) Vout(V) VOUT VS VIN 3.45 3.30 3.00 3.25 2.00 3.20 1.00 3.15 0.00 4 6 8 10 12 14 16 18 20 22 24 Vin(V) 4 6 8 10 12 14 16 18 20 22 24 Vin(V) FOSC VS TEMP 180 165 170 160 160 FOSC (KHz) Fosc(KHz) Fosc VS VIN 170 155 150 150 140 130 145 120 140 4 6 8 -20 10 12 14 16 18 20 22 24 Vin(V) 0 20 60 80 100 120 temp (℃ ) VFB VS TEMP ICCQ VS TEMP 6.0 1.28 5.0 ICCQ (mA) 1.26 VFB (V) 40 1.24 1.22 1.20 4.0 3.0 2.0 1.0 0.0 1.18 -20 0 20 40 60 temp (℃ ) 80 100 120 -20 0 20 40 60 80 100 120 temp (℃ ) 7 Advanced Power Electronics Corp. APE1701 TYPICAL PERFORMANCE CHARACTERISTICS Output Ripple (VIN=12V, VOUT=3.3V, IOUT=2A) Power on Test Wave (VIN=12V, VOUT=5V, IOUT=2A ) Load Transient Response (VIN=12V, VOUT=5V, IOUT=0.1~2A) EN on Test Wave (VIN=12V, VOUT=5V, IOUT=2A ) Efficiency (VIN=12V, VOUT=3.3V) Efficiency (VIN=12V, VOUT=5.0V) Vin=12V 90% 80% 80% 70% 70% 60% 60% Efficiency(%) Efficiency(%) Vin=12V 90% 50% 40% 30% 50% 40% 30% 20% 20% 10% 10% 0% 0% 0.0 0.5 1.0 Iout(A) 1.5 2.0 0.0 0.5 1.0 Iout(A) 1.5 2.0 8 Advanced Power Electronics Corp. APE1701 MARKING INFORMATION SO-8 Part Number Package Code 1701M-&& YWWSSS Output Voltage : Blank : Adj 33 : 3.3V ; ; 50 : 5.0V 12 : 12V Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 9