AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER General Description Features • • • • • • • • • • • 94% Efficient Step-Up DC to DC Converter Wide Input Range 0.9V to 5.5V 1.8V to 5.5V Adjustable Output Voltage 1.8MHz Operating Frequency Current Mode Operation for faster transient response and better loop stability 1µA Shutdown Mode Suitable with Low ESR Ceramic Capacitors (MLCC) Over Current Protection Over Temperature Protection MSOP-10L: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) The AP6714 is fully integrated synchronous current mode boost converter which provides a complete power supply solution for all one-cell, two-cell, three cell, alkaline, NiCd or NiMh or single-cell Lithion battery powered products. They improve performance, component count and size compared to conventional controllers, lithium-ion (Li+) designs. On-chip MOSFETs provide up to 94% efficiency for critical power supplies. This optimizes overall efficiency and cost, while also reducing board space. Operate at one fixed frequency of 1.8MHz to optimize size, cost, and efficiency. Other features include soft-start and overload protection. AP6714 is available in space-saving 10-pin MSOP package. Applications • • • • • All One-cell, Two-cell, Three cell, Alkaline, NiCd or NiMh or Single-cell Li+ Battery Powered Devices. Cell Phones Digital Cameras MP3 Players PDAs Ordering Information AP 6714 M10 G - 13 Package Green Packing M10 : MSOP-10L G : Green 13 : Tape & Reel Device AP6714M10G-13 Notes: Package Code M10 Packaging (Note 2) MSOP-10L 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes. 2. 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. AP6714 Rev. 4 1 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Pin Assignments ( Top View ) Vcc 1 10 OUT EN 2 9 LX CC 3 8 OCP FB 4 7 PGND REF 5 6 SGND MSOP-10L Pin Descriptions Pin Name Pin # Description VCC 1 Power Input pin EN 2 Enable Channel CC 3 Channel Compensation Pin FB 4 Channel Feedback Pin REF 5 Internal Reference Voltage SGND 6 Signal Ground PGND 7 Power Ground OCP 8 Over Current Protection LX 9 SW Pin OUT 10 Boost Output Pin AP6714 Rev. 4 2 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Block Diagram VCC CC EN Smith - Trigger Power - Good Oscillator OUT ZCR Comparator + - Bias Error Amplifier Ramp PWM Comparator - - FB + + Soft - Start PWM Control & Anti Through Logic LX Vref=1.23V By Pass OCP BANDGAP Current - Limit Thermal - shutdown OCP Comparator + SGND - PGND 0.16V Absolute Maximum Ratings Symbol Parameter Rating Unit 3 250 KV Machine Model ESD Protection OUT, VCC, EN, FB, OCP to GND -0.3 to +6.5 V LX to GND -0.3 to (OUT + 0.3) V LX Current 1.6 A -0.3 to (VCC + 0.3) V 850 mW ESD HBM Human Body Model ESD Protection ESD MM ILX REF, CC to GND o PD Continuous Power Dissipation (TA = +25 C) TJ Operating Junction Temperature Range TST Storage Temperature Range V -40 to +125 o C -65 to +150 o C Recommend Operating Conditions Symbol Rating Unit o TA Operating Ambient Temperature Range -40 to +85 VIN Supply Voltage at VIN (Note 3) 0.9 to 5.5 V Output Voltage 1.8 to 5.5 V VOUT Notes: Parameter C 3. The AP6714 is powered by step-up output. An internal low-voltage startup oscillator drives the starting at approximately 0.9V and the main control will take over as soon as output is reached. AP6714 operation could be kept in low input voltage and output current is just limited. AP6714 Rev. 4 3 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Electrical Characteristics Symbol Parameter GENERAL ISTB Standby Current ICC Supply Current REFERENCE VREF Reference Output Voltage ΔVREF/ΔT Tempco of Reference VREF(LOAD) Reference Load Regulation VREF(LINE) Reference Line Regulation OSCILLATOR FOSC OSC Frequency STEP-UP DC-TO-DC ΔVOUT/ΔT Tempco of Output Voltage FB Input Leakage Current Duty Step-Up Maximum Duty Cycle IOUT OUT Leakage Current ILXL LX Leakage Current RDS(ON) Switch On-Resistance ILM N-Channel Current Limit THERMAL-SHUTDOWN PROTECTION Thermal Shutdown Thermal Hysteresis LOGIC INPUTS EN Input Low Level EN Input High Level OVER CURRENT PROTECTION Over Current Protection VOCP Voltage THERMAL RESISTANCE Thermal Resistance θJA Junction-to-Ambient Thermal Resistance θJC Junction-to-Case Notes: (VCC = 3.6V, TA = 25oC, unless otherwise noted) Conditions VCC =3.6V ,VEN=0V VCC =EN = 3.6V, FB = 1.5V -40 oC ≤T≤125 oC 10mA < ILOAD < 200mA 2.8 < VCC < 5.5V IOUT=10mA, -40 oC≤T≤85 oC FB = 1.25V FB = 0V VLX = 0V, OUT = 5V VLX = OUT = 5V N channel, Vcc= 5V P channel, Vcc= 5V VIN=1.5V (Note 4) 1.5V < VCC < 5.5V 1.5V < VCC < 5.5V ROCP=0.1Ω Min Typ. Max Unit - 0.5 150 1 300 µA µA 1.205 - 1.23 30 4.5 1.3 1.255 50 10 5 V ppm/ oC mV mV 1400 1800 2200 KHz -100 80 1.2 50 0.01 85 1 2 200 300 1.4 100 +100 90 5 5 1.6 ppm/ C nA % µA µA - 150 40 - 0.8 - 0.4 - V V - 0.16 - V o mΩ A o o C C MSOP-10L (Note 5) 161 o C/W MSOP-10L (Note 5) 43 o C/W 4. The step-up current limit in startup refers to the LX switch current limit, not the output current limit. 5. Test condition for MSOP-10L: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias, double sided FR-4 PCB. AP6714 Rev. 4 4 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Application Circuit (Note 6) VOUT 1 R2 1 MOhm 2 Rcc 27 KOhm 3 U1 VCC 5 C2 C3 470p 0.1u 10 LX 9 CC OCP 8 FB PGND REF SGND EN 4 R TOP OUT L1 Rocp 2.7uH VIN 0.1 Ohm 7 6 C IN COUT AP6714 10u 10u R BOTTOM VOUT = VFB × (1 + Notes: RTOP RBOTTOM ) 6. Recommended minimum RBOTTOM: 100 KΩ. Typical Operating Characteristics Supply Current vs. Temperature 300 300 275 275 Supply Current (uA) Supply Current (uA) Supply Current vs. Input Voltage 250 225 200 175 150 125 250 225 200 175 150 VIN=2.4V VIN=3.6V 125 100 100 0.9 1.5 1.8 2.4 3 3.6 4.2 5 Input Voltage (V) -25 25 85 125 Temperature (℃ ) Figure. 1 AP6714 Rev. 4 -40 Figure. 2 5 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) Frequency vs. Temperature Stand-by Current vs. Temperature 2050 VIN=1.5V VIN=3.0V 1.2 2000 Frequency (KHz) Stand-by Current (uA) 1.4 1 0.8 0.6 0.4 1950 1900 1850 1800 1750 0.2 1700 0 -40 25 105 -40 125 25 85 105 Figure. 3 Figure. 4 Max Duty vs. Temperature Vref vs. Temperature (Vout=5.5V Iout=10mA) 1.26 87 1.25 86 1.24 Vref (V) 88 85 84 1.23 1.22 83 1.21 82 1.2 VIN=1.8 VIN=3.6 1.19 81 -40 -25 25 85 105 125 Temperature (℃) -40 -25 25 105 125 Temperature (℃) Figure. 5 AP6714 Rev. 4 125 Temperature (℃) Temperature (℃ ) Max Duty (%) -25 Figure. 6 6 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) Input Voltage vs. Max Start Up Current (Vout=3.3V) Input Voltage vs. Current Limit Vout=3.3V ROCP=0.1Ω Current Limit (mA) 1200 1000 800 600 400 Iout Isw 200 Max Start Up Current (mA) 1400 0 0.9 1 1.2 1.3 1.5 1.8 2 2.4 2.6 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 Iout Isw 0.9 3 1 1.1 1.2 Figure. 7 Figure. 8 EFFI. vs. Output Current (Vin=1.3V Vout=2.5V) EFFI. vs. Output Current (Vin=1.5V Vout=2.5V) 100 100 90 90 80 80 70 70 EFFI. (%) EFFI. (%) 1.4 1.5 1.8 2 2.2 2.4 Input Voltage (V) Input Voltage (V) 60 50 40 60 50 40 30 30 20 20 10 10 0 0 10 30 50 80 100 150 200 250 Output Current (mA) 10 50 100 150 200 300 Output Current (mA) Figure. 9 AP6714 Rev. 4 1.3 Figure. 10 7 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) EFFI. vs. Output Current (Vin=1.5V Vout=3.3V) 100 100 90 90 80 80 70 70 EFFI. (%) EFFI. (%) EFFI. vs. Output Current (Vin=1.3V Vout=3.3V) 60 50 40 60 50 40 30 30 20 20 10 10 0 0 10 30 50 80 100 150 10 200 100 150 200 300 Output Current (mA) Output Current (mA) Figure. 11 Figure. 12 EFFI. vs. Output Current (Vin=2.0V Vout=3.3V) EFFI. vs. Output Current (Vin=2.5V Vout=3.3V) 100 100 90 90 80 80 70 70 EFFI. (%) EFFI. (%) 50 60 50 40 60 50 40 30 30 20 20 10 10 0 0 50 100 150 200 300 400 500 100 150 200 300 400 500 Output Current (mA) Output Current (mA) Figure. 13 AP6714 Rev. 4 50 Figure. 14 8 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) EFFI. vs. Output Current (Vin=3.6V Vout=5.0V) 100 100 90 90 80 80 70 70 EFFI. (%) EFFI. (%) EFFI. vs. Output Current (Vin=3.0V Vout=3.3V) 60 50 40 60 50 40 30 30 20 20 10 10 0 0 100 150 200 300 400 50 500 100 150 200 300 400 500 400 500 Output Current (mA) Output Current (mA) Figure. 15 Figure. 16 EFFI. vs. Output Current (Vin=4.2V Vout=5.0V) EFFI. vs. Output Current (Vin=4.5V Vout=5.0V) 100 100 90 90 80 80 70 70 EFFI. (%) EFFI. (%) 50 60 50 40 60 50 40 30 30 20 20 10 10 0 0 50 100 150 200 300 400 500 Output Current (mA) 100 150 200 300 Output Current (mA) Figure. 17 AP6714 Rev. 4 50 Figure. 18 9 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) Switching Current vs. Output Ripple Switching Current vs. Output Ripple Figure. 19 Figure. 20 Load Transient Response Load Transient Response Figure. 21 Figure. 22 AP6714 Rev. 4 10 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) Load Transient Response Load Transient Response Figure. 23 Figure. 24 Load Transient Response Load Transient Response Figure. 25 Figure. 26 AP6714 Rev. 4 11 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Typical Operating Characteristics (Continued) Power On Wave Power On Wave Figure. 27 Figure. 28 Application Information Input Capacitor Selection The input filter capacitor reduces peak currents drawn from the input source and reduces input switching noise .In most applications a 10uF is recommended. Output Capacitor Selection The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of the converter. This ripple os determined by two parameters of the capacitor, the capacitance and the ESR (Equivalent Series Resistance). It is possible to calculate the minimum capacitance needed for the defined ripple, supposing that ESR is zero, by using Equation below: C MIN = I OUT × (VOUT − V IN ) f × ΔV × VOUT where f =the switching frequency △V =the maximum allowed ripple Shutdown Mode The AP6714 converter will stop switching by setting EN pin Low, and is turned on by pulling it high. If this feature is not used, the EN pin should be tied to VCC pin to keep the regulator output on all the time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. AP6714 Rev. 4 12 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Application Information (Continued) Inductor Selection The high frequency operation of the AP6714 allows the use of small surface mount inductors. The minimum inductance value is limited by the following constraints: L> V IN ( MIN ) × (VOUT ( MAX ) − V IN ( MIN ) ) f × I SW ( Ripple ) × VOUT ( MAX ) H Where f= Operating frequency (Hz) ISW(Ripple)= Allowable Inductor Current Ripple (A) VIN(MIN)= Minimum Input Voltage (V) VOUT(MAX)= Maximum Output Voltage (V) Over Current Protection (OCP) A resistor is required to connect PGND pin and OCP pin to prevent an overload occurs at the output. The output voltage will drop and duty cycle will be reduced if the OCP exceeds 0.16V. When ROCP is 0.1Ω, the maximum switching current to operate normally is 1.6A (0.16V/0.1Ω). However, the actual switching current is related to duty ratio. By the way, larger ROCP is recommended when VOUT − VIN ≤ 0.5V since the dropped output voltage is smaller then regular case while an overload condition exists. Internal circuit of OCP function Thermal Information The maximum recommended junction temperature (TJ) of AP6714 is 125°C. The thermal resistance of the 10-pin MSOP10 package is RθJA = 161°C/W, if the Power PAD is soldered. Specified regulator operation is assured to an ambient temperature TA of 45°C. Therefore, the maximum power dissipation is about 500mW. More power can be dissipated if the maximum ambient temperature of the application is lower. PD ( MAX ) = TJ ( MAX ) − TA RθJA Designing a PC Board Good PC board layout is important to achieve optimal performance from AP6714. Poor design can cause excessive conducted and/or radiated noise. Conductors carrying discontinuous currents and any high-current path should be made as short and wide as possible. A separate low-noise ground plane contain-ing the reference and signal grounds should connect to the power-ground plane at only one point to minimize the effects of power-ground currents. Typically, the ground planes are best joined right at the IC. Keep the voltage-feedback network very close to the IC, preferably within 0.2in (5mm) of the FB pin. Nodes with high dV/dt (switching nodes) should be kept as small as possible and should be routed away from high-impedance nodes such as FB. AP6714 Rev. 4 13 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER Marking Information ( Top View ) 9 10 8 Logo 7 6 A~Z : Green Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week YWX 6714 Part Number 2 1 3 4 5 MSOP-10L Package Information (All Dimensions in mm) (1) Package type: MSOP-10L 10x-0.30 4.4 4.8/5.0 2.95/3.05 1 1 0.75/0.95 1.10Max. 0.5Typ. Seting plane C Gauge plane 0.4/0.7 AP6714 Rev. 4 "A" 0.25 C 1 Land Pattern Recommendation (Unit:mm) 0° / 8 ° 0.10 2.95/3.05 0.05/0.15 0.1/0.2 0.17/0.27 10x-1.4 8x-0.50 DETAIL "A" 14 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP6714 1.8MHz SYNCHRONOUS BOOST CONVERTER IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP6714 Rev. 4 15 of 15 www.diodes.com FEBRUARY 2009 © Diodes Incorporated