Advanced Power Electronics Corp. APE2901 MICROPOWER VFM STEP-UP DC/DC Converter FEATURES DESCRIPTION Very Low Supply Current Regulated Output Voltage Wide Range of Output Voltage is Available from 2.5V to 5.0V by 0.1V Steps Output Voltage Accuracy ±5% Output Current up to 100mA Low Ripple and Low Noise Very Low Start-up Voltage High Efficiency (Vout = 5V TYP. 87%) Few External Components Internal Soft-Start Low Profile: SOT-23, SOT-89 & SOT-23-5L Pb-Free The APE2901 is a high efficiency VFM Step-up DC/DC converter for small, low input voltage or battery powered systems with ultra low quiescent supply current. The APE2901 accept a positive input voltage from start-up voltage to VOUT and convert it to a higher output voltage in the 2.5 to 5V range. The APE2901 combine ultra low quiescent supply current and high efficiency to give maximum battery life. The high switching frequency and the internally limited peak inductor current permits the use of small, low cost inductors. Only three external components are needed an inductor a diode and an output capacitor. The APE2901 is suitable to be used in battery powered equipment where low noise, low ripple and ultra low supply current are required. The APE2901 is available in very small package: SOT-23, SOT-89 & SOT-23-5L. Typical applications are pagers, cameras & video camera, cellular telephones, wireless telephones, palmtop computer, battery backup supplies, battery powered i t TYPICAL APPLICATION VIN VOUT 47uH C1 100uF NC NC D1 B140 SW GND OUT C2 47uF C3 1uF APE2901 ORDERING INFORMATION APE2901XX-XX Package Type Y5 : SOT-23-5L N : SOT-23 G : SOT-89 VOUT 22 : 2.2V 25 : 2.5V 26 : 2.6V 27 : 2.7V : 50 : 5.0V Data and specifications subject to change without notice 1 201009076 Advanced Power Electronics Corp. APE2901 ABSOLUTE MAXIMUM RATINGS (TA= 25 VIN Supply Voltage(VIN) …………………………… o C) 5.5 V SW Voltage(VSW ) …………………………………… 5.5 V OUT Voltage(VOUT) ………………………………… 5.5 V Power Dissipation(PD) ……………………………… ( TJ-TA ) / Rthja W Storage Temperature Range(T ST) ………………… -40°C To 150°C Operating Junction Temperature Range(T OP) …… -20°C To + 100°C Note. Rth JA is measured with the PCB copper area of approximately 1 in2(Multi-layer) that need connect to GND pin of the APE2901. PACKAGE INFORMATION Top View NC NC 5 4 SOT-89 SOT-23-5L 1 Top View Vout Tab is Vout 2 1 3 2 GND Vout SW SW GND VOUT o SOT-23 3 GND o Rthjc=110 C/W Rthja=250oC/W SW o Rthjc=100 C/W Rthjc=110 C/W Rthja=160oC/W Rthja=250oC/W ELECTRICAL SPECIFICATIONS ( VIN=1.8V, IOUT=10mA, TA=25 oC, unless otherwise specified) Parameter SYM OUTPUT VOLTAGE ACCURACY START-UP VOLTAGE(VIN-VF)(Note 1) HOLD-ON VOLTAGE SUPPLY CURRENT INTERNAL SWITCH R DSON △VOUT MIN TYP MAX UNITS -5 - 5 % VSTART-UP IOUT=1mA, VIN =rising from 0 to 2V - 0.8 1.2 V VHOLD IOUT=1mA, VIN =falling from 2 to 0V 0.6 - - V ISUPPLY No Load - 22 - uA ILX=150mA - 850 - mΩ VLX=4V, Forced VOUT=3.8V - - 0.5 uA - 150 - KHz To be measure on SW pin - 77 - % Vout=2.5V~3.0V, IOUT=50mA - 82 - % Vout=3.1V~4.0V, IOUT=50mA - 83 - % Vout=4.1V~5.0V, IOUT=50mA - 87 - % RLX(DSON INTERNAL LEAKAGE CURRNET ILX(leak MAXIMUM OSCILLATOR FREQUENCY FOSC OSCILLATOR DUTY ON DON EFFICIENCY TEST CONDITION η Note 1: The minimum input voltage for the IC start-up is strictly a function of the VF catch diode. PIN DESCRIPTIONS PIN SYMBOL SW PIN DESCRIPTION Switch Pin. Connect External Inductor & Diode here. GND GND Pin OUT Output Voltage 2 Advanced Power Electronics Corp. APE2901 BLOCK DIAGRAM + - OUT VREF SW LIMITER AMP. - + VFM CONTROL ERROR AMP. Driver GND OPERATION The APE2901 architecture is built around a VFM CONTROL logic core, switching frequency is set through a built in oscillator. TON time is fixed (Typ. 5uS) while TOFF time is determined by the error amplifier output, a logic signal coming from the comparison made by the Error Amplifier Stage between the signal coming from the output voltage divider network and the internal Band-Gap voltage reference (Vref). TOFF reaches a minimum (Typ. 1.7uS) when heavy load conditions are met (Clock frequency 150KHz). An over current conditions, through the internal power switch, causes a voltage drop VLX=RDSON x ISW and the VLX limiter block forces the internal switch to be off, so narrowing TON time and limiting internal power dissipation. In this case the switching frequency may be higher than the 150KHz set by the internal clock generator. VFM control ensures very low quiescent current and high conversion efficiency even with very light loads. Since the Output Voltage pin is also used as the device Supply Voltage, the versions with higher output voltage present an higher internal supply voltage that results in lower power switch RDSON, slightly greater output power and higher efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at IOUT=1mA) once the system is started. If the input voltage exceeds the output voltage, the output will follow the input, however, the input or output voltage must not be forced above 5.5V. APPLICATION INFORMATION INPUT/OUTPUT CAPACITOR SELECTION The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior of these elements. The output ripple voltage is the product of the peak inductor current and the output capacitor Equivalent Series Resistance (ESR). Best performances are obtained with good high frequency characteristics capacitors and low ESR. The best compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor; Lower values may cause higher Output Ripple Voltage and lower Efficiency without compromising the functionality of the device. An Input Capacitor is required to compensate, if present, the series impedance between the Supply Voltage Source and the Input Voltage of the Application. INDUCTOR SELECTION A 47µH inductor is recommended for most APE2901 applications. However, the inductance value is not critical, and the APE2901 will work with inductors in the 33µH to 120µH. 3 Advanced Power Electronics Corp. APE2901 APPLICATION INFORMATION DIODE SELECTION Schottky diodes with higher current ratings usually have lower forward voltage drop, larger diode capacitance and fast reverse recovery, it is the ideal choices for APE2901 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the system, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. PCB LAYOUT GUIDE When laying out the PC board, the following suggestions should be taken to ensure proper operation of the APE2901. These items are also illustrated graphically in below. 1. The power traces, including the GND trace, the SW trace and the VCC trace should be kept short, direct and wide to allow large current flow. Put enough multiply-layer pads when they need to change the trace layer. 2. Do not trace signal line under inductor. 4 Advanced Power Electronics Corp. APE2901 TYPICAL PERFORMANCE CHARACTERISTICS APE2901-30, IOUT=50mA, Output Voltage vs. Temperature APE2901-30, TA=25℃ , Input Voltage vs. Output Voltage 3.05 3.50 Output Voltage (V) 2.50 0.9V 1.8V 1.2V 1.5V 2.00 1.50 1.00 Output Vlotage (V) 2.4V 3.00 3.00 2.4V 2.95 1.8V 1.2V 2.90 2.85 0.50 10 0 75 50 25 -2 0 25 0 22 5 20 0 17 5 15 0 12 5 10 0 75 50 25 10 0 0 2.80 0.00 Temperature (℃ ) Output Current (m A) APE2901-30, Start-up Voltage vs. Output Current APE2901-30, VIN=1.8V, Output Voltage vs. Temperature 3.10 1.0 3.00 0.9 Start-up Vlotage (V) 2.80 IOUT=50mA IOUT=0mA IOUT=100mA IOUT=150mA IOUT=200mA IOUT=250mA 0.3 0.1 Temperature (℃ ) 10 0 Output Current (mA) APE2901-30, IOUT=1mA, Start-up Voltage vs. Temperature APE2901-30, IOUT=1mA, Hold-On Voltage vs. Temperature 1.0 0.4 0.9 0.4 Hold-On Vlotage (V) 0.8 0.7 0.6 0.5 0.4 0.3 0.3 0.3 0.2 0.2 0.1 0.2 0.1 0.1 10 0 75 50 25 0 10 0 75 50 0 25 Temperature (℃) -2 0 0.0 0.0 -2 0 Start-up Vlotage (V) 75 0.0 1 50 25 0 -2 0 2.30 0.4 0.2 10 0 2.40 0.5 50 2.50 0.6 25 2.60 0.7 10 2.70 75 Output Vlotage (V) 0.8 2.90 Temperature (℃ ) 5 Advanced Power Electronics Corp. APE2901 TYPICAL PERFORMANCE CHARACTERISTICS Input Voltage vs. Supply Current APE2901-30, Supply Current vs. Temperature 50 800 45 700 VIN=1.2V 35 30 APE2901-33 APE2901-30 25 20 15 APE2901-28 Supply Current (uA) 600 500 400 VIN=1.5V 300 VIN=1.8V 200 10 100 5 VIN=2.4V 100 180 90 160 80 60 40 40 30 20 10 0 75 0 -2 0 0 50 10 0 25 20 -2 0 10 0 50 10 0 80 60 75 100 70 50 120 25 140 0 Oscillator Duty-On (%) 200 Temperature (℃ ) Temperature (℃ ) APE2901-30, IOUT=50mA, Efficiency vs. Temperature APE2901-30, Efficiency vs. Output Current 90 90 80 2.4V 88 70 1.8V 86 1.2V 0.9V 1.5V 50 40 30 2.4V 1.8V Efficiency (%) 60 84 82 80 1.2V Output Current (mA) 75 50 25 -2 0 25 0 22 5 20 0 17 5 15 0 12 5 10 0 74 75 76 0 50 10 0 78 20 25 75 APE2901-30, Oscillator Duty-On vs. Temperature APE2901-30, Maximum Oscillator Frequency vs. Temperature Maximum Oscillator Frequency (KHz) 50 Temperature (℃ ) Input Voltage (V) Efficiency (%) 25 -2 0 2. 4 1. 8 1. 5 1. 2 0 0 0 10 0 Supply Current (uA) 40 Temperature (℃ ) 6 Advanced Power Electronics Corp. APE2901 TYPICAL PERFORMANCE CHARACTERISTICS APE2901-30, SW Switching Current Limit vs. Temperature APE2901-30, VIN=1.8V, Efficiency vs. Temperature 90 900 SW Switching Current Limit (mA) IOUT=50mA 85 IOUT=100mA IOUT=150mA 75 IOUT=200mA 70 IOUT=250mA 65 60 55 50 860 840 820 800 780 760 Temperature (℃ ) 10 0 75 50 25 0 -2 0 10 0 75 50 25 740 0 -2 0 Efficiency (%) 80 880 Temperature (℃ ) 7 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 0.35 0.40 0.50 C 0.10 0.15 0.25 D 2.70 2.90 3.10 E 1.50 1.60 1.80 e --- 1.90(TYP) --- H 2.60 2.80 3.00 L 0.37 --- --- θ1 1° 5° 9° e2 --- 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 : XX (Identification Code) Date Code : YW Y : Year W : Weak XXYW Part Number Identificatio n Code Part Number Identificatio n Code APE2901Y5-2.2V To APE2901Y5-3.8V TN APE2901Y5-2.5V TA APE2901Y5-3.9V TO APE2901Y5-2.6V TB APE2901Y5-4.0V TP APE2901Y5-2.7V TC APE2901Y5-4.1V TQ APE2901Y5-2.8V TD APE2901Y5-4.2V TR APE2901Y5-2.9V TE APE2901Y5-4.3V TS APE2901Y5-3.0V TF APE2901Y5-4.4V TT APE2901Y5-3.1V TG APE2901Y5-4.5V TU APE2901Y5-3.2V TH APE2901Y5-4.6V TV APE2901Y5-3.3V TI APE2901Y5-4.7V TW APE2901Y5-3.4V TJ APE2901Y5-4.8V TX APE2901Y5-3.5V TK APE2901Y5-4.9V TY APE2901Y5-3.6V TL APE2901Y5-5.0V TZ APE2901Y5-3.7V TM 8 ADVANCED POWER ELECTRONICS CORP. Package Outline : SOT-23 D Millimeters SYMBOLS D1 E1 E e MIN NOM MAX A 1.00 1.15 1.30 A1 0.00 -- 0.10 A2 0.10 0.15 0.25 D1 0.30 0.40 0.50 e 1.70 2.00 2.30 D 2.70 2.90 3.10 E 2.40 2.65 3.00 E1 1.40 1.50 1.60 1.All Dimension Are In Millimeters. A 2.Dimension Does Not Include Mold Protrusions. A2 A1 Part Marking Information & Packing : SOT-23 XXYY Date Code : YY YY:2004,2008,2012… YY:2003,2007,2011… YY:2002,2006,2010… YY:2001,2005,2009… Part Number : XX (Identification Code) Part Number Identificatio n Code Part Number Identificatio n Code APE2901N-2.2V To APE2901N-3.8V TN APE2901N-2.5V TA APE2901N-3.9V TO APE2901N-2.6V TB APE2901N-4.0V TP APE2901N-2.7V TC APE2901N-4.1V TQ APE2901N-2.8V TD APE2901N-4.2V TR APE2901N-2.9V TE APE2901N-4.3V TS APE2901N-3.0V TF APE2901N-4.4V TT APE2901N-3.1V TG APE2901N-4.5V TU APE2901N-3.2V TH APE2901N-4.6V TV APE2901N-3.3V TI APE2901N-4.7V TW APE2901N-3.4V TJ APE2901N-4.8V TX APE2901N-3.5V TK APE2901N-4.9V TY APE2901N-3.6V TL APE2901N-5.0V TZ APE2901N-3.7V TM 9 ADVANCED POWER ELECTRONICS CORP. Package Outline & Packing : SOT-89 C J D B 2 1 E 3 F I H K Millimeters SYMBOLS MIN NOM MAX A 4.40 - 4.60 B 4.05 - 4.25 C 1.40 - 1.75 E 2.40 - 2.60 F 0.89 - 1.20 I 0.35 - 0.55 H ---- 1.50 ---- G ---- 3.00 ---- J 1.40 - 1.60 K 0.35 - 0.43 G 1.All Dimensions Are in Millimeters. A 2.Dimension Does Not Include Mold Protrusions. Part Marking Information : SOT-89 2901& YWWS Part Number Output Voltage --- APE2901-22 : o APE2901-25 : A APE2901-26 : B Date Code (YWWS) APE2901-27 : C : Y : Year APE2901-49 :Y WW：Week APE2901-50 : Z S：Sequence 10