Advanced Power Electronics Corp. APE1707 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 38.5V 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 40V Output Load Current 2A SO-8, ESOP-8, TO-263-5L and TO-252-5L Pb-Free Packages. Low Power Standby Mode. Built-in Switching Transistor on Chip The APE1707 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 APE1707 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 SO-8, ESOP-8, TO-263-5L and TO-252-5L packages. Halogen Free Product TYPICAL APPLICATION 1. ADJUSTABLE OUTPUT VOLTAGE VERSION VIN=12V 1 C2 0.1uF Vout=5.0V/2A 2 47uH U1 C1 470uF L1 Vcc Vss SW Vss FB Vss EN Vss D1 B340A R1 4.7K C3 470uF C6 0.1uF R2 1.5K APE1707 Data and specifications subject to change without notice 1 20130206V2.1 Advanced Power Electronics Corp. APE1707 TYPICAL APPLICATION 2. ADJUSTABLE OUTPUT VOLTAGE VERSION WITH DELAYED STARTUP VIN=12V L1 Vout=2.5V/2A 1 2 33uH U1 C1 470uF C2 0.1uF C4 0.1uF R3 100k Vcc Vss SW Vss FB Vss EN Vss R1 1.8K D1 B240A C3 470uF C6 0.1uF R2 1.8K APE1707 ON/OFF VOUT = VFB x (1 + R1/R2 ), VFB = 1.23V, R2 = 0.47K ~ 3K 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 L1 recommend value (IOUT=2A,) VOUT 2.5V 3.3V 5V 12V V IN =12V 33uH 33uH 47uH NA V IN =24V 33uH 33uH 47uH 68uH 3. FIXED OUTPUT VOLTAGE VERSION VIN=12~24V C2 0.1uF 2 33uH U1 C1 470uF Vout=3.3V/2A L1 1 Vcc Vss SW Vss FB Vss EN Vss D1 B340A C3 470uF C6 0.1uF APE1707-33 2 Advanced Power Electronics Corp. APE1707 TYPICAL APPLICATION 4. INVERTING -5V REGULATOR WITH DELAYED STARTUP VIN=5~20V 33uH 2A/30V 0.1uF 220uF 0.1uF 220uF Vcc Vss SW Vss FB Vss EN Vss 100uF 0.1uF IN5400 3A/20V VOUT -5V200mA APE1707-50 100k ORDERING / PACKAGE INFORMATION Package Type Output Voltage M : SO-8 MP : ESOP-8 H : TO-252-5L S : TO-263-5L ( Top View ) 33:3.3V 50:5.0V 12: 12V Blank:ADJ 5 EN 4 FB 3 Vss 2 SW 1 Vcc Metal Tab Vss ( Top View ) 5 EN 4 FB 3 VSS 2 SW 1 VCC Metal Tab Vss ( Top View ) ( Top View) VCC 1 8 VSS VCC 1 SW 2 7 VSS SW 2 FB 3 6 VSS FB 3 EN 4 5 VSS EN 4 SO-8 TO-263-5L (Side View) TO-252-5L (Side View) APE1707X-XX VSS 8 VSS 7 VSS 6 VSS 5 VSS ESOP-8 3 Advanced Power Electronics Corp. APE1707 ABSOLUTE MAXIMUM RATINGS (at TA=25°C) Maximum Supply Voltage(VCC) ------------------------- +45V ON/OFF PIN Input Voltage(VEN) ------------------------ -0.3V to 40V Feedback PIN Voltage(VFB) ------------------------------ -0.3V to 12V Output Voltage to Ground(VOUT) ------------------------ -0.8V Power Dissipation(PD) ------------------------------------- (TJ-TA)/Rthja Storage Temperature Range(T ST) --------------------- -65°C To 150°C Operating Junction Temperature Range(T J) -------- -20°C To 125°C Operating Supply Voltage(VOP) +4.5V to +40V Thermal Resistance from Junction to Case(R thjc) TO-263-5L 3.5°C/W TO-252-5L 8°C/W SO-8 20°C/W ESOP-8 10°C/W Thermal Resistance from Junction to Ambient(R thja) TO-263-5L 25°C/W TO-252-5L 35°C/W SO-8 60°C/W ESOP-8 40°C/W Note. R thja is measured with the PCB copper area(need connect to VSS pins) of approximately 1.5 in 2 (Multi-layer). ELECTRICAL SPECIFICATIONS (Unless otherwise specified, T A=25°C, VCC=12V for 3.3V, 5V, adjustable version and VCC=18V for the 12V version. ILOAD = 0.2A) Parameter Quiescent Current SYM IQ Feedback Bias Current IFB Shutdown Supply Current ISD of Short Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Load Regulation( △VOUT/VOUT ) Saturation Voltage SW Pin=-0.8V FSCP DC ICL Current Limit SW Pin=0V VFB=1.3V (Adjustable version only) EN pin=5V VCC=40V FOSC Oscillator Frequency Oscillator Frequency Circuit Protect TEST CONDITION VFB=12V force driver off SW Pin Leakage Current △VOUT VSA T ISW L MIN - TYP 4 MAX 8 UNITS - -10 -50 nA - 100 200 uA mA 127 150 173 KHz (Adjustable) When V FB<0.5V - 50 - KHz (Fixed)When < V OUT*40% - 50 - KHz VFB=0V force driver on - 100 - VFB=12V force driver off - 0 - 2.5 - - A - 0.6 1.2 % - 1.2 1.4 V - - -200 uA - -5 - mA Pear current, No outside circuit V FB=0V force driver on IOUT = 0.2 to 2A IOUT=2A, No outside circuit VFB=0V force driver on No outside circuit, VFB=12V force driver off VCC=40V force driver off % 4 Advanced Power Electronics Corp. APE1707 ELECTRICAL SPECIFICATIONS(Cont.) Parameter EN Pin Logic Input Threshold Voltage SYM VIL TEST CONDITION Low (regulator ON) VIH EN Pin Logic Input Current IH High (regulator OFF) VEN=2.5V (OFF) EN Pin Input Current IL VEN=0.5V (ON) TSD Thermal Shutdown Temp Version Characteristics Symbol APE1707-ADJ Output Feedback Voltage VFB Efficiency APE1707-3.3V APE1707-5.0V APE1707-12V MIN - Conditions ILOAD =0.2A VOUT programmed for 3.3V η VOUT VCC=12V, ILOAD=2A ILOAD =0.2A Output Voltage η VOUT VCC=12V, ILOAD=2A ILOAD =0.2A Efficiency Output Voltage η VOUT VCC=12V, ILOAD=2A ILOAD =0.2A Efficiency η VCC=15V, ILOAD=2A Output Voltage Efficiency TYP 1.3 MAX 0.6 - UNITS V 2 - -0.1 -10 - -0.01 -1 - 135 - °C MIN TYP MAX UNITS 1.193 1.23 1.267 V uA - 79 - % 3.2 3.3 3.4 V - 80 - % 4.85 5.0 5.15 V - 84 - % 11.64 12 12.36 V - 90 - % PIN DESCRIPTIONS PIN SYMBOL VSS PIN DESCRIPTION GND pin FB Output voltage feedback control EN ON/OFF shutdown SW Switching output VCC Operating voltage input BLOCK DIAGRAM EN 200mV V CC 220mV CURRENT SOURCE BIAS 1.235V REFERENCE 2.5V REGULATOR START UP + _ COMP. Current limit FB _ 150kHz OSC. COMP. + R2 + AMP _ + COMP. _ COMP. CONTROL + DRIVER R1 2A SWITCH SW Thermal Shutdown Vss ADJ : R2=0Ω, R1=OPEN 5 Advanced Power Electronics Corp. APE1707 FUNCTION DESCRIPTION PIN FUNCTION 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. 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 APE1707 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 APE1707 (SO-8 package) operating as a buck-switching regulator in an ambient temperature of 25℃ (still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures require 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. 6 Advanced Power Electronics Corp. APE1707 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. 7 Advanced Power Electronics Corp. APE1707 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=3.3V, 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. APE1707 MARKING INFORMATION TO-252-5L Part Number Package Code 1707H-XX Logo YWWSSS Output Voltage : Blank : Adj ; 50 : 5.0V 33 : 3.3V ; 12 : 12V Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence TO-263-5L Part Number Package Code 1707S - XX Logo YWWSSS Output Voltage : Blank : Adj ; 50 : 5.0V 33 : 3.3V ; 12 : 12V Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence SO-8 / ESOP-8 1707X-&& YWWSSS Part Number Package Code : M : SO-8 ; MP : ESOP-8 Output Voltage : Blank : Adj ; 50 : 5.0V 33 : 3.3V ; 12 : 12V Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 9