AP5727

AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Description The AP5727 is a high efficiency boost converter in a compact SOT25 that provides the bias voltages for OLED Sub Display and TFT-LCD (Liquid Crystal Display). A high 1.2MHz switching frequency and internal compensation minimizes external part count, PCB area and cost. Integrated soft start reduces inrush current. The AP5727 has a 1.25V feedback voltage making it compatible with industry standard boost converters used to bias LCD panels. Pin Assignments ( Top View ) SW 1 5 VIN GND 2 7 4 SOT25 N EW PRODUCT FB 3 EN Features • • • • • • • • Applications • • • 30V High Output Voltage Fast 1.2MHz Switching Frequency Current limit and UVLO Protections Internal Thermal Shutdown Maximum 1µA Shutdown Current Integrated Soft-start Function SOT25: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) Small size TFT-LCD Bias power supply. OLED bias supply for a clamshell handset sub display RF amplifier bias voltages Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit L1 VIN 22uH C IN 4.7uF V IN EN GND SW COUT 10uF D1 VOUT R1 AP5727 FB R2 Figure 1. Typical Application Circuit AP5727 Document number: DS31887 Rev. 2 - 2 1 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Functional Block Diagram 1 SW Comparator Driver A2 R S Q Q1 + RC FB 3 A1 + CC N EW PRODUCT Σ RAMP Generator 2 GND EN 4 Shutdown 1.2MHz Oscillator Figure 2. Block Diagram Pin Descriptions Name SW GND FB EN VIN Description Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. GND pin Feedback Pin. Reference voltage is 1.25V. Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not used, connect EN to the input source for automatic startup. The EN pin cannot be left floating. Input Supply Pin. Must be locally decoupled - 4.7μF recommended to reduce input noise. AP5727 Document number: DS31887 Rev. 2 - 2 2 of 10 www.diodes.com + January 2011 © Diodes Incorporated VIN 5 V REF 1.25V AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Absolute Maximum Ratings (TA = 25°C) Symbol VIN VSW VFB EN TJ(MAX) TLEAD TST Parameter VIN Pin Voltage SW Voltage Feedback Pin Voltage EN Maximum Junction Temperature Lead Temperature Storage Temperature Range Rating -0.3~7 -0.3~32 -0.3~7 -0.3~7 150 300 -65 to +150 Unit V V V V °C °C °C N EW PRODUCT Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any condition. Recommended Operating Conditions Symbol VIN TJ TA Parameter Input Voltage Operating Junction Temperature Operating Ambient Temperature Min 2.7 -40 -40 Max 5.5 125 85 Unit V °C °C Electrical Characteristics (VIN = 3.6V, TA = 25°C, unless otherwise specified) Symbol Parameter System Supply Input VIN Operating Input Voltage UVLO Under Voltage Lockout Under Voltage Lockout Hysteretic IQ Quiescent Current ISD Shutdown Current Oscillator FOSC Operation Frequency Dmax Maximum Duty Cycle Reference Voltage VFB Feedback Voltage IFB FB Pin Bias Current MOSFET RDS(on) On Resistance of MOSFET IOCP Switching Current Limit Control and Protection EN Voltage High EN Voltage Low IEN EN Pin Pull Low Current Thermal Resistance Junction-toθJA Ambient Thermal Resistance Junction-toθJC Case Notes: Conditions Min. 2.7 1 86 1.225 10 1.5 - Typ. 2.2 85 500 0.1 1.2 90 1.25 45 0.95 750 4 162 36 Max. 5.5 2.4 1 1.4 1.275 100 1.2 0.4 6 Unit V V mV μA μA MHz % V nA Ω mA V V μA o FB=1.3V, No Switching VEN < 0.4V Normal Operation ON OFF SOT25 (Note 2) SOT25 (Note 2) C/W C/W o 2. Test condition for SOT25: Device mounted on FR-4 substrate, single-layer PC board, 2oz copper, with minimum recommended pad layout AP5727 Document number: DS31887 Rev. 2 - 2 3 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Typical Performance Characteristics (VIN 3.3V; VOUT = 15V IOUT = 20mA) VIN vs. Shutdown Current 0.1 0.08 0.06 0.04 0.02 0 2.5 3 3.5 4 VIN (V) 4.5 5 5.5 VIN vs. Quiescent Current 800 Quiescent Current(uA) 700 600 500 400 300 200 100 0 2.5 3 3.5 4 VIN (V) 4.5 5 5.5 N EW PRODUCT Shutdown Current(uA) VIN vs. Frequency 1.4 Frequency(MHZ) 100 VIN vs. Max Duty 1.3 Max Duty (%) 95 1.2 90 1.1 85 1 2.5 3 3.5 4 VIN (V) 4.5 5 5.5 80 2.5 3 3.5 4 VIN (V) 4.5 5 5.5 VIN vs. Feedback Voltage 1.27 Feedback Voltage(V) IOUT vs. Feedback Voltage 1.27 Feedback Voltage(V) 1.26 1.25 1.24 1.23 1.22 2.5 3 3.5 4 VIN (V) 4.5 5 5.5 1.26 1.25 1.24 1.23 1.22 0 10 20 30 IOUT (mA) 40 50 AP5727 Document number: DS31887 Rev. 2 - 2 4 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Typical Performance Characteristics (VIN 3.3V; VOUT = 15V IOUT = 20mA) Temperature vs. Shutdown Current 2 Shutdown Current(uA) 1.6 1.2 0.8 0.4 0 -50 -25 0 25 50 75 Temperature (℃) 100 125 1.7 Temperature vs. Frequency Frequency (MHZ) 1.4 1.1 N EW PRODUCT 0.8 0.5 -50 -25 0 25 50 75 100 125 Temperature (℃) Temperature vs. Feedback Voltage 1.3 Feedback Voltage(mV) 1.28 90 85 IOUT (mA) vs. Efficiency (%) VIN = 5V VIN = 4.2V VIN = 3.6V VIN = 3.3V Efficiency(%) 80 75 70 65 60 1.26 1.24 1.22 1.2 -50 -25 0 25 50 75 Temperature (℃) 100 125 55 50 0 20 40 60 80 IOUT (mA) AP5727 Document number: DS31887 Rev. 2 - 2 5 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Typical Performance Characteristics (Continued) VOUT Ripple VIN = 3.3V; VOUT = 15V ; IOUT = 5mA VOUT Ripple VIN = 3.3V; VOUT = 15V ; IOUT = 50mA N EW PRODUCT SW N SW VOUT VOUT POWER ON VIN = 3.3V; VOUT = 15V ; IOUT = 50mA POWER OFF VIN = 3.3V; VOUT = 15V ; IOUT = 50mA VEN VOUT VEN VOUT IL IL AP5727 Document number: DS31887 Rev. 2 - 2 6 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Typical Performance Characteristics (Continued) Load Transient Response VIN = 3.3V; VOUT = 15V ; IOUT = 5~50mA VOUT N EW PRODUCT IOUT Application Information Inductor Selection A 10μH~22μH inductor is recommended for most AP5727 applications. Although small size and high efficiency are major concerns, the inductor should have low core loss at 1.2MHz and low DCR. Capacitor Selection Ceramic capacitors, due to their small size, are ideal for AP5727 applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as X5R and X7R. A 4.7μF input capacitor and a 10μF output capacitor are sufficient for most AP5727 applications. Diode Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for AP5727 applications. The forward voltage drop of a Schottky diode represents the conduction loss in the diode, while the diode capacitance (CT) represents the switching loss. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching loss at the 1.2MHz switching frequency of the AP5727. AP5727 Document number: DS31887 Rev. 2 - 2 7 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Application Circuit VOUT D1 1 B0540WS Cout 10uF R1 11K R2 1K 1 2 3 U1 SW GND FB AP5727 EN 4 Vin 5 22uH Cin 4.7uF L1 2 VIN N EW PRODUCT Table 1. Suggested Inductors Vendor Wurth Electronics GOTREND TAIYO YUDEN Vendor TAIYO YUDEN TAIYO YUDEN Vendor ZETEX DIODES DIODES Vendor YAGEO Inductors (uH) 22 22 22 Capacitance 4.7uF 10uF Rating 40V/0.5A 40V/0.5A 40V/0.25A Type SMD Current Rating (A) 0.51A 0.56A 0.51A Type SMD SMD Type SOD323 SOD323 SOD523 Series FR-SK Type SMD SMD SMD Dimensions (mm) 3.8X 3.8 X 1.6 3.8 X 3.8 X 1.05 4.0 X 4.0 X 1.25 Series LMK316 B7 475KL-T LMK316 F 106ZL-T Series ZLLS400 B0540WS SDM20U40 Series 744031220 GLP3810PH220N NR4012 Table 2. Suggested Capacitors for CIN and COUT Table 3. Suggested Diodes Table 4. Suggested Resistor Ordering Information AP 5727 W G - 7 Package W : SOT25 Device AP5727WG-7 Note: Green G : Green Packaging (Note 3) SOT25 Packing 7 : Tape & Reel Package Code W 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP5727 Document number: DS31887 Rev. 2 - 2 8 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED Marking Information (1) SOT25 ( Top View ) 5 4 7 XX Y W X 1 2 3 XX : Identification Code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Identification Code H8 N EW PRODUCT Part Number AP5727 Package SOT25 Package Outline Dimensions (All Dimensions in mm) (1) Package Type: SOT25 AP5727 Document number: DS31887 Rev. 2 - 2 9 of 10 www.diodes.com January 2011 © Diodes Incorporated AP5727 BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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