Advanced Power Electronics Corp. APE1723 200KHz, 1A PWM BUCK DC/DC CONVERTER FEATURES DESCRIPTION Output Voltage : Adjustable Output Version. Adjustable Version Output Voltage Range : 0.745V to 24V. 200KHz Fixed Switching Frequency. Thermal-shutdown and Current-limit Protection. ON/OFF Shutdown Control Input. Short Circuit Protect (SCP). Operating Voltage can be up to 26V. Output Load Current : 1A. Low Power Standby Mode. Built-in Switching Transistor on Chip. SOT-23-5L and SO-8 packages. The APE1723 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 1A 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 the APE1723’s VFB is down below 0.5V, the switching frequency will be reduced. The APE1723 operates at a switching frequency of 200KHz thus allow smaller sized filter components. Other features include a guaranteed +3% tolerance on output voltage under specified input voltage and output load conditions, The chips are available in SOT-23-5L and SO-8 packages. TYPICAL APPLICATION C1 100uF Vout=5V/1A L1 VIN=12V C2 0.1uF U1 APE1723 5 VIN SW 1 R3 100k (Refer table) D1 B140A 4 EN ON/OFF C4 0.1uF FB 3 2 Vss R1 6.8K C3 C6 220uF 0.1uF R2 1.2K VOUT = VFB x (1+R1/R2) , VFB= 0.745V, R2 = 0.75K ~4 K Table 1 Resistor select for output voltage setting VOUT R2 R1 5V 1.2K 6.8K 3.3V 2.4K 8.2K 2.5V 2K 4.7K 1.8V 3.3K 4.7K 1.5V 2K 2K 1.3V 2K 1.5K 1.2V 2K 1.2K L1 recommend value (VIN=12V, IOUT=1A) VOUT 1.8V 2.5V 3.3V 5V L1 Value 33uH 33uH 47uH 47uH Data and specifications subject to change without notice 1 200812231 Advanced Power Electronics Corp. APE1723 ABSOLUTE MAXIMUM RATINGS (at TA=25°C) Maximum Supply Voltage(VIN) -------------------------- +30V Feedback PIN Voltage(VFB) ----------------------------- -0.3V to 12V ON/OFF PIN Voltage(VEN) ------------------------------- -0.3V to VIN Output Voltage to Ground(VOUT) ------------------------ -0.8V Power Dissipation(PD) ------------------------------------- (TJ-TA)/RthJA W Storage Temperature Range(T ST) --------------------- -65°C To 150°C Operating Junction Temperature Range(T OPJ) ----- -40°C To 125°C Operating Supply Voltage(VOP) ------------------------- +4.5V to 26V Thermal Resistance from Junction to Case(Rth JC) SO-8 50°C/W SOT-23-5L 180°C/W Thermal Resistance from Junction to Ambient(RthJA) SO-8 120°C/W SOT-23-5L 250°C/W Note. Rth JA is measured with the PCB copper area(need connect to V SS pins) of approx. 1.5 in 2 (multi-layers) ORDERING/PACKAGE INFORMATION (Top View) APE1723X Package Type Y5 : SOT-23-5L M : SO-8 SW 1 VSS 2 FB 3 ( Top View ) 5 4 VIN EN NC 1 8 NC SW 2 7 NC EN 3 6 VIN VSS 4 5 FB SOT-23-5L SO-8 ELECTRICAL SPECIFICATIONS (VCC=12V, VOUT=3.3V, ILOAD=0.3A, TA=25°C, unless otherwise specified) Parameter SYM TEST CONDITION IOUT=0.3A MIN 0.723 TYP MAX 0.745 0.767 UNITS V Feedback Voltage VFB Quiescent Current IQ VFB=1.2V force driver off - 3.5 6 mA Feedback Bias Current IFB IOUT=0.1A - -10 -50 nA ISD VEN =0V Shutdown Supply Current Oscillator Frequency Oscillator Frequency Circuit Protect Max. Duty Cycle (ON) Min. Duty Cycle (OFF) - 2 10 uA 140 200 260 KHz (Adjustable) When VFB<0.5V - 50 - KHz VFB=1.2V force driver off - 0 - VFB=0V force driver on - 100 - 1.2 - - A - 1.2 1.5 V FOSC of Short FSCP DC Current Limit ILIMIT Saturation Voltage VSA T Pear current, No outside circuit V FB=0V force driver on IOUT=1A, No outside circuit VFB=0V force driver on % 2 Advanced Power Electronics Corp. APE1723 ELECTRICAL SPECIFICATIONS(Cont.) Parameter SYM SW Pin=0V SW Pin Leakage current SW Pin=-0.8V EN Pin Logic Voltage TEST CONDITION VIN=26V, No outside circuit ISWL Input Threshold TYP MAX UNITS - - -200 uA -5 - mA VFB=1.0V force driver off - VIH High (regulator ON) - VIL Low (regulator OFF) IH VEN=2.5V (ON) 0.5 - 20 - VEN=0.3V (OFF) - -5 - - 145 - EN Pin Logic Input Current EN Pin Input Current IL Thermal Shutdown Temp MIN TSD 2 - V uA °C PIN DESCRIPTIONS PIN SYMBOL VSS FB PIN DESCRIPTION GND Pin Feedback Pin Power -Off Pin H : Normal Operation(Step-down) EN L : Step-down Operation Stopped (All circuits deactivated) SW Switch Output VIN Operating Voltage Input NC No Connect Pin BLOCK DIAGRAM EN 200mV VIN 220mV CURRENT SOURCE BIAS 0.745V REFERENCE 2.5V REGULATOR START UP + _ COMP. Current limit _ OSC. COMP. + + AMP _ + COMP. COMP. _ FB CONTROL + DRIVER SW Thermal Shutdown Vss 3 Advanced Power Electronics Corp. APE1723 FUNCTION PIN DESCRIPTION Pin Functions VIN 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 (+VIN – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be minimized. FB 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 10uA. Pulling this pin below a threshold voltage of approximately 0.5V shuts the regulator down, and pulling this pin above 2.0V (up to a maximum of VIN) turns the regulator on. 4 Advanced Power Electronics Corp. APE1723 TYPICAL PERFORMANCE CHARACTERISTICS Iout vs VFB (Vin=12V) 0.76 0.755 0.755 0.75 0.75 VFB (V) VFB (V) 0.76 Temperature vs VFB (Vin=12V Iout=300mA) 0.745 0.745 0.74 0.74 0.735 0.735 0.73 0.73 100 300 500 800 1000 -40 1200 -20 4 4 3.6 3.6 Iccq (mA) Iccq (mA) 4.4 2.8 50 85 105 125 3.2 2.8 2.4 2.4 2 2 4.5V 8V 12V 16V 20V 24V -40 26V -20 260 Frequency (KHz) 220 200 180 160 25 50 85 105 125 Temperature vs Frequency (Vin=12V Iout=300mA) Vin vs Frequency 260 240 0 Temperature (℃ ) Vin(V) Frequency (KHz) 25 Temperature vs Iccq (Vin=12V) Vin vs Iccq 4.4 3.2 0 Temperature (℃ ) Iout (mA) 240 220 200 180 160 140 140 4.5V 8V 12V 16V Vin(V) 20V 24V 26V -40 -20 0 25 50 85 105 Temperature (℃) 125 5 Advanced Power Electronics Corp. APE1723 TYPICAL PERFORMANCE CHARACTERISTICS Temperature vs Fscp (Vin=12V) 59 80 57 70 55 Fscp (KHz) Fscp (KHz) Vin vs Fscp 53 51 60 50 40 30 49 20 47 10 0 45 4.5V 8V 12V 16V 20V 24V -40 26V -20 Vin(V) 1.9 1.9 1.7 1.7 Current Limit (A) Current Limit (A) Vin vs Current Limit 1.5 1.3 1.1 0.9 50 85 105 125 Temperature vs Current Limit (Vin=12V) 1.5 1.3 1.1 0.9 0.5 0.5 4.5V 8V 12V 16V 20V 24V -40 26V -20 0 25 50 85 105 125 Temperature (℃ ) Vin(V) Iout vs Saturation Voltage (Vin=12V) Temperature vs Ishutdown (Vin=12V) 6 5 1.4 Ishutdown (uA) Saturation Voltage (V) 25 0.7 0.7 1.6 0 Temperature (℃ ) 1.2 1 0.8 4 3 2 1 0.6 0 0.4 100 300 500 800 Iout (mA) 1000 1200 -40 -20 0 25 50 85 105 125 Temperature (℃ ) 6 Advanced Power Electronics Corp. APE1723 TYPICAL PERFORMANCE CHARACTERISTICS Iout vs EFFI (Vin=8V Vout=5V) 90.00% 86.00% 86.00% EFFICIENCY EFFICIENCY 90.00% Iout vs EFFI (Vin=12V Vout=5V) 82.00% 78.00% 74.00% 82.00% 78.00% 74.00% 70.00% 200 500 800 Iout (mA) 1000 70.00% 200 500 800 1000 Iout (mA) Output Ripple (12V→5V @1A) Output Ripple (24V→5V @1A) EN Off→ON Test (12V→5V @1A) EN Off→ON Test (24V→5V @1A) 7 Advanced Power Electronics Corp. APE1723 TYPICAL PERFORMANCE CHARACTERISTICS Load Transient (12V→5V @0.1~1A) Load Transient (24V→5V @0.1~1A) 8 ADVANCED POWER ELECTRONICS CORP. Package Outline : SOT-23-5L Millimeters SYMBOLS MIN NOM MAX A 1.00 1.10 1.30 A1 0.00 --- 0.10 A2 0.70 0.80 0.90 b 0.30 0.40 0.50 C 0.10 0.15 0.25 D 2.70 2.90 3.10 E 1.40 1.60 1.80 e --- 1.90(TYP) --- H 2.60 2.80 3.00 L 0.37 --- --- θ1 0° 5° 9° e1 --- 0.95(TYP) --- Note 1：Package Body Sizes Exclude Mold Flash Protrusions or Gate Burrs. Note 2：Tolerance ± 0.1000 mm(4mil) Unless Otherwise Spe- cified. Note 3：Coplanarity：0.1000 mm Note 4：Dimension L Is Measured in Gage plane. Part Marking Information & Packing : SOT-23-5L Part Number : N1 Year ---- 8 : 2008 A : 2010 XXYW Weak : (01~26) A~Z (27~52) a~z 9 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 Package Code 1723M YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 10