APW7277 5V, 5A, 1.2MHz Synchronous Boost Converter Features General Description • The APW7277 is a synchronous rectifier, fixed switching frequency (1.2MHz typical), and current-mode step-up 92% Effiicency Synchronous Boost Converter With 1000-mA Output Current From 1.8V Input • Stable with Low ESR Output Capacitors • Fixed 1.2MHz Oscillator Frequency • Low EMI Converter (Integrated Anti-Ringing regulator. The device allows use of small inductors and output capacitors for USB devices. The current-mode control scheme provides fast transient response and good output voltage accuracy. Function) At light loads, the APW7277 will automatically enter in Pulse Frequency Modulation (PFM) operation to reduce • Low Battery Output • Integrated Power Save Mode Operation to Improve the dominant switching losses. During PFM operation, the IC consumes very low quiescent current and Light Load Efficiency • Load Disconnected During Shutdown • Output Current-Limit Protection • Over Temperature Protection • Under Voltage Protection • Enable/Shutdown Function • Available in TQFN4x4-16 and DFN3x3-12 Packages • Lead Free and Green Devices Available maintains high efficiency over the complete load range. The APW7277 also includes current-limit and overtemperature shutdown to prevent damage in the event of an output overload. The APW7277 is available in 4mmx4mm TQFN4x4-16 and DFN3x3-12 packages. Applications (RoHS Compliant) Pin Configuration VOUT FB GND NC VOUT VOUT 16 15 14 13 12 LBO 1 2 11 EN (Exposed Pad) PGND SW 3 SW 10 PSI • Power Bank • Tablet • Portable Equiment PGND 1 12 SW PGND 2 11 SW NC 3 10 VOUT VBAT 4 PSI 5 NC 6 (Exposed PAD) PGND 9 FB 8 GND 7 EN 9 LBI 4 7 8 PGND VBAT PGND 6 PGND 5 Exposed PAD on bankside DFN3x3-12 TOP VIEW TQFN4x4-16 Top View ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 1 www.anpec.com.tw APW7277 Ordering and Marking Information For Adjustable Voltage Version APW7277 Package Code QB : TQFN4x4-16 Assembly Material QA: DFN3x3-12 Operating Ambient Temperature Range I : -40 to 85 oC Handling Code Temperature Range Handling Code TR : Tape & Reel Assembly Material G: Halogen and Lead Free Device Package Code For Fixed Voltage Version APW7277 Voltage Code 50: 5.0V Assembly Material Blank : Adjustable Version Handling Code Temperature Range Package Code Voltage Code APW7277QB: APW7277QA: APW7277 XXXXX APW 7277 XXXXX APW7277-50QB: XXXXX - Date Code APW7277-50QA: XXXXX - Date Code 7277-50 XXXXX 7277 50 XXXXX XXXXX - Date Code XXXXX - Date Code Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by weight). Absolute Maximum Ratings Symbol (Note 1) Rating Unit VOUT Output and IC Supply Voltage (VOUT to GND) Parameter -0.3 ~ 7 V VBAT Converter Supply Voltage (VBAT to GND) -0.3 ~ 7 V VSW SW to GND Voltage >30ns -0.3 ~ 7 V <30ns -3 ~ 9 V -0.3 ~ 7 V LBI, SYNC, EN, LBO and FB to GND Voltage PGND to GND PD Power Dissipation TJ Maximum Junction Temperature TSTG Storage Temperature TSDR Maximum Lead Soldering Temperature (10 Seconds) -0.3 ~ +0.3 V - W 150 o -65 ~ 150 o 260 o C C C Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 2 www.anpec.com.tw APW7277 Thermal Characteristics Symbol Parameter Typical Value Unit TQFN4x4-16 40 °C/W DFN3x3-12 50 TQFN4x4-16 15 DFN3x3-12 20 Junction-to-Ambient Resistance in free air (Note 2) θJA Junction-to-Case Resistance θJC °C/W Note 2 : θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. Recommended Operating Conditions (Note 3) Symbol Parameter VOUT Output and IC Supply Voltage (VOUT to GND) VBAT Converter Supply Voltage (VBAT to GND) VSW TA TJ SW to GND Voltage Range Unit 2.7 ~ 5.5 V 1.8 ~ VOUT V >30ns -0.3 ~ VOUT+0.3 V <30ns -3 ~ VOUT+3 V LBI, PSI, EN, LBO to GND Voltage 0 ~ VOUT Ambient Temperature -40 ~ 85 o -40 ~ 125 o Junction Temperature V C C Note 3 : Refer to the typical application circuit Electrical Characteristics Unless otherwise specified, these specifications apply over VBAT=3.3V, VOUT=5V and TA= 25 oC. Symbol Parameter APW7277 Test Conditions Unit Min Typ Max 1.8 - 5.5 V 3.0 - 5.5 V SUPPLY VOLTAGE AND CURRENT VBAT Converter Range Supply VOUT Converter Output and IC Supply Voltage IDD1 No Switching Quiescent Current Measured from VOUT, VFB=0.6V, VOUT=3.3V - 40 60 µA IVBAT-SD VBAT Quiescent Current VEN=GND, VBAT=3.3V VOUT) - 0.1 1 µA VUVLO VBAT Under Threshold 1.6 1.7 1.8 V Regulated Feedback Voltage 490 500 510 mV FB Input Leakage Current -100 - 100 nA - 30 - Voltage Voltage Lockout VBAT (Operation Max)=VO/1.1 Rising (Isolate VBAT & REFERENCE AND OUTPUT VOLTAGE VREF IFB Over Temperature Hysteresis(note 4) Protection Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 TJ Falling 3 O C www.anpec.com.tw APW7277 Electrical Characteristics Unless otherwise specified, these specifications apply over VBAT=3.3V, VOUT=5V and TA= 25 oC. Symbol Parameter APW7277 Test Conditions Unit Min Typ Max INTERNAL POWER SWITCH FOSC Switching Frequency FB=GND 900 1200 1500 MHz RN-FET N-FET Switch On Resistance VOUT=5V - 55 - mΩ RP-FET P-FET Switch On Resistance VOUT=5V - 55 - mΩ N-FET Current Limit VOUT=5V 4.5 5.5 - A Dead-time (note 4) VOUT=3.3V~5V - 10 - ns 85 95 - % - 700 - mA EN Input Low Threshold - - 0.4 V EN Input High Threshold 1 - - V Internal Pull Low - 500 - kΩ PSI Input Low Threshold - - 0.4 V DMAX SW Maximum Duty Cycle PFM Current Limit CONTROL STAGE EN PSI 1 - - V IEN PSI Input High Threshold EN Input Leakage Current VEN=1.5V - 3 5 µA IPSI PSI Input Leakage Current VPSI=1.5V - 0.4 1 µA 490 500 510 mV - 10 - mV - 10 100 nA - 400 - Ω - - 10 mA - 0.01 0.1 µA - +100 - mA - 80 - %VREF TJ Rising - 150 - O C TJ Falling - 30 - O C LOW BATTER INDICATOR VLBI LBI Voltage Threshold LBI Input Hysteresis LBI Input Current LBO Output Low Voltage ILBO=100uA LBO Output Low Current LBO Output Leakage Current VLBO=5V ZERO CURRENT DETECT VZC P-FET Zero Current Detect PROTECTION VFB Under Voltage Protection Over Temperature Protection (note 4) TOTP Over Temperature Hysteresis(note 4) Protection Note 4: Guaranteed by design, not production tested. Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 4 www.anpec.com.tw APW7277 Pin Description PIN NAME 1,15,16 VOUT 2 NC 3,4 SW FUNCTION Converter Output and IC Supply Voltage. Enable in Connection. Charge Done No Internal Converter Switch Pin. Connect inductor here. Enable in Charge Done 5,6,7 PGND 8 VBAT Power Ground. Connect these pins to GND. 9 LBI Low Battery Indicator. 10 PSI Power Saving Input. Force VPSI exceed 1V enter PFM. Left VPSI below 0.4V enter PWM mode. 11 EN Device Enable Control Input. Force VEN exceed 1V enable the device. Left VEN below 0.4V to shutdown. 12 LBO Low Battery Output. 13 GND Signal Ground. Connect this pin to PGND. 14 FB Exposed Pad PGND Enable in Charge Done Converter Supply Voltage. Converter Feedback Input. Power Ground. Tie this pin to the ground island/plane through the lowest impedance connection available. Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 5 www.anpec.com.tw APW7277 Typical Operating Characteristics Efficiency VS Io 100.0 95.0 95.0 90.0 90.0 Efficiency (%) Efficiency (%) Efficiency VS Io 100.0 85.0 80.0 75.0 - VBAT=2.2V - VBAT=2.7V 70.0 85.0 80.0 75.0 - VBAT=3.3V - VBAT=3.7V - VBAT=4.2V 70.0 65.0 65.0 Vo=5V,Cin=22uF,Co=66uF,L=2.2uH Vo=3.3V,Cin=22uF,Co=66uF,L=2.2uH 60.0 60.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 1 0.25 0.5 0.75 1 1.25 1.5 1.75 2 Io (A) Io (A) Quiescent Current VS Output Voltage Quiescent Current VS Temperature 50 44.0 Quiescent Current(uA) Quiescent Current (uA) 45 40 35 30 25 42.0 40.0 38.0 36.0 34.0 32.0 20 2 2.5 3 3.5 4 4.5 5 5.5 30.0 -40 -20 6 0 20 40 60 80 100 120 140 160 180 Output Voltage (V) Temperature (oC) Reference Voltage VS Temperature Frequency VS Temperature 520 1300 1250 515 512.5 Frequency (KHz) Reference Voltage (mV) 517.5 510 507.5 505 502.5 500 497.5 1200 1150 1100 1050 1000 495 950 492.5 490 -40 -20 0 20 40 60 80 900 -40 -20 100 120 140 Temperature(oC) Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 0 20 40 60 80 100 120 140 160 Temperature(oC) 6 www.anpec.com.tw APW7277 Operating Wavrforms Power on EN Normal Operation CH1 CH1 CH2 CH2 CH3 CH3 CH4 CH4 CH1:VBAT-2V/div CH2:VOUT -2V/div CH3:VSW-5V/div CH4:IL-500mA/div Time:1us/div CH1:VBAT-2V/div CH2:VOUT -2V/div CH3:VSW-5V/div CH4:IL-1A/div Time:100us/div Power off EN UVP CH1 CH1 CH2 CH2 CH3 CH3 CH4 CH4 CH1:VBAT-2V/div CH2:VOUT -2V/div CH3:VSW-5V/div CH4:IL-1A/div Time:100us/div Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 CH1:VBAT-2V/div CH2:VOUT -5V/div CH3:VSW-5V/div CH4:IL-1A/div Time:10us/div 7 www.anpec.com.tw APW7277 Block Diagram PSI VBAT LBI From VOUT VREF 0.5V VOUT LBO VMAX Control ZeroCrossing Comparator EN Shutdown Control SW Logic Control OverTemperature Protection Gate Control Current limit Slope Compensation Current Sense Amplifier ∑ Oscillator Error Amplifier ICMP FB COMP VREF 0.5V GND Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 8 Softstart From VMAX Control www.anpec.com.tw APW7277 Typical Application Circuits Typical Application L1 3,4 SW VOUT VBAT PGND VOUT = 5V 1,15,16 2.2µH VBAT 8 C1 22µF R3 300k 5,6,7 R1 510k C3 C2 22µFx3 (MLCC) APW7277 11 PFM PWM 10 9 R4 100k EN FB PSI GND LBI LBO 14 R2 56k 13 R5 100k 12 C3 is option Power Bank Application L1 3,4 SW VOUT VBAT PGND VOUT = 5V/2.1A 1,15,16 2.2µH VBAT 8 C1 22µF R3 300k 5,6,7 R1 68k C3 11 PFM PWM 10 9 R4 100k EN FB PSI GND LBI LBO 14 R2 7.5k 13 C4 100µF C2 22µF (MLCC) APW7277 R5 100k 12 C3 is option R2 value suggest is less than 7.5k C4 value suggest is more than 100µF 2 Cell Alkaline Application L1 3,4 SW VOUT VBAT PGND VOUT= 3.3V 1,15,16 2.2µH VBAT 8 C1 22µF R3 300k 5,6,7 R1 510k C3 C2 22µFx3 (MLCC) APW7277 11 PFM PWM 10 9 R4 100k EN FB PSI GND LBI LBO 14 13 R2 56 k R5 100k 12 C3 is option Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 9 www.anpec.com.tw APW7277 Function Description Main Control Loop Load Disconnect The APW7277 is a constant frequency, synchronous rectifier, and current-mode switching regulator. In normal Driving EN to ground places the APW7277 in shutdown mode. When in shutdown, the internal power MOSFET turns off, all internal circuitry shuts down and the quies- operation, the internal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS cent supply current reduces to 1µA maximum. A special circuit is applied to disconnect the load from the latch and turned off when an internal comparator (ICMP) resets the latch. The peak inductor current which ICMP input during shutdown the converter. In conventional synchronous rectifier circuits, the back-gate diode of the high- resets the RS latch is controlled by the voltage on the COMP node, which is the output of the error amplifier side P-FET is forward biased in shutdown and allows current flowing from the battery to the output. However, (EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an output this device uses a special circuit, which takes the cathode of the back-gate diode of the high-side P-FET and feedback voltage VFB at FB pin. When the load current increases, it causes a slightly decrease in VFB relative to disconnects it from the source when the regulator is shutdown. The benefit of this feature for the system de- the 0.5V reference, which in turn causes the COMP voltage to increase until the average inductor current matches sign engineer is that the battery is not depleted during shutdown of the converter. No additional components the new load current. must be added to the design to make sure that the battery is disconnected from the output of the converter. Start-up A start-up oscillator circuit is integrated in the APW7277. When the device enables, the circuit pumps the output Current-Limit Protection voltage high. Once the output voltage reaches 1.6V (typ), the main DC-DC circuitry turns on and boosts the output The APW7277 monitors the inductor current, flowing voltage to the final regulation voltage. limit level to prevent loads and the APW7277 from damages during overload conditions. through the N-FET, and limits the current peak at current- Automatic PFM/PWM mode Switch The APW7277 is a fixed frequency PWM peak current modulation control step-up converter. At light loads, the Over-Temperature Protection (OTP) The over-temperature circuit limits the junction temperature of the APW7277. When the junction temperature ex- APW7277 will automatically enter in pulse frequency modulation operation to reduce the dominant switching ceeds 150oC, a thermal sensor turns off the both N-FET and P-FET, allowing the devices to cool. The thermal losses. In PFM operation, the inductor current may reach zero or reverse on each pulse. A zero current comparator sensor allows the converters to start a soft-start process and regulate the output voltage again after the junction turns off the P-channel synchronous MOSFET, forcing DCM(Discontinuous Current Mode) operation at light load. temperature cools by 30oC. The OTP is designed with a 30oC hysteresis to lower the average Junction Tempera- These controls get very low quiescent current, help to maintain high efficiency over the complete load range. ture (TJ) during continuous thermal overload conditions, increasing the lifetime of the device. Synchronous Rectification The internal synchronous rectifier eliminates the need for an external Schottky diode, thus reducing cost and board space. During the cycle off-time, the P-FET turns on and shunts the FET body diode. As a result, the synchronous rectifier significantly improves efficiency without the addition of an external component. Conversion efficiency can be as high as 92%. Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 10 www.anpec.com.tw APW7277 Application Information Recommended Minimum Footprint The via diameter =0.012 Hole size =0.008 0.024 0.021 0.079 014 0. 0.026 0.079 layout Unit : Inch TQFN4x4-16 The via diameter =0.3048 Hole size =0.2032 0.6 0.55 0.35 2 0.65 2 layout Unit : mm TQFN4x4-16 Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 11 www.anpec.com.tw APW7277 Package Information TQFN4x4-16 A b E D Pin 1 A1 D2 A3 L K E2 Pin 1 Corner e S Y M B O L TQFN4x4-16 MILLIMETERS INCHES MIN. MAX. MIN. MAX. A 0.70 0.80 0.028 0.031 A1 0.00 0.05 0.000 0.002 A3 0.20 REF 0.008 REF b 0.25 0.35 0.010 0.014 D 3.90 4.10 0.154 0.161 0.083 D2 1.90 2.10 0.075 E 3.90 4.10 0.154 0.161 E2 1.90 2.10 0.075 0.083 e 0.65 BSC L 0.40 K 0.20 Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 0.026 BSC 0.016 0.50 0.020 0.008 12 www.anpec.com.tw APW7277 Package Information DFN3x3-12 A b E D Pin 1 A1 D2 A3 L K E2 Pin 1 Corner e S Y M B O L DFN3x3-12 MILLIMETERS INCHES MIN. MAX. MIN. MAX. A 0.80 1.00 0.031 0.039 A1 0.00 0.05 0.000 0.002 0.007 A3 0.20 REF 0.008 REF 0.012 b 0.18 0.30 D 2.90 3.10 0.114 0.122 0.106 D2 2.20 2.70 0.087 E 2.90 3.10 0.114 0.122 E2 1.40 1.75 0.055 0.069 0.50 0.012 e 0.45 BSC L 0.30 K 0.20 Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 0.018 BSC 0.020 0.008 13 www.anpec.com.tw APW7277 Carrier Tape & Reel Dimensions P0 P2 P1 A B0 W F E1 OD0 K0 A0 A OD1 B B T SECTION A-A SECTION B-B H A d T1 Application A H 330.0±2.00 50 MIN. P0 P1 4.0±0.10 8.0±0.10 A H 330±2.00 50 MIN. P0 P1 4.0±0.10 8.0±0.10 TQFN4x4-16 Application DFN3x3-12 T1 C 12.4+2.00 13.0+0.50 -0.00 -0.20 P2 D0 1.5+0.10 2.0±0.05 -0.00 T1 C 12.4+2.00 13.0+0.50 -0.00 -0.20 P2 D0 1.5+0.10 2.0±0.05 -0.00 d D 1.5 MIN. 20.2 MIN. D1 4.30±0.20 4.30±0.20 d T 0.6+0.00 -0.40 D 1.5 MIN. 20.2 MIN. 12.0±0.30 1.75±0.10 D1 T 0.6+0.00 -0.40 1.5 MIN. 1.5 MIN. W E1 12.0±0.30 1.75±0.10 A0 W B0 E1 F 5.5±0.05 K0 1.30±0.20 F 5.5±0.05 A0 B0 K0 3.30±0.20 3.30±0.20 1.30±0.20 (mm) Devices Per Unit Package Type Unit Quantity TQFN4x4-16 Tape & Reel 3000 DFN3x3-12 Tape & Reel 3000 Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 14 www.anpec.com.tw APW7277 Taping Direction Information TQFN4x4-16 USER DIRECTION OF FEED DFN3x3-12 USER DIRECTION OF FEED Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 15 www.anpec.com.tw APW7277 Classification Profile Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 16 www.anpec.com.tw APW7277 Classification Reflow Profiles Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly 100 °C 150 °C 60-120 seconds 150 °C 200 °C 60-120 seconds 3 °C/second max. 3°C/second max. 183 °C 60-150 seconds 217 °C 60-150 seconds See Classification Temp in table 1 See Classification Temp in table 2 Time (tP)** within 5°C of the specified classification temperature (Tc) 20** seconds 30** seconds Average ramp-down rate (Tp to Tsmax) 6 °C/second max. 6 °C/second max. 6 minutes max. 8 minutes max. Preheat & Soak Temperature min (Tsmin) Temperature max (Tsmax) Time (Tsmin to Tsmax) (ts) Average ramp-up rate (Tsmax to TP) Liquidous temperature (TL) Time at liquidous (tL) Peak package body Temperature (Tp)* Time 25°C to peak temperature * Tolerance for peak profile Temperature (Tp) is defined as a supplier minimum and a user maximum. ** Tolerance for time at peak profile temperature (tp) is defined as a supplier minimum and a user maximum. Table 1. SnPb Eutectic Process – Classification Temperatures (Tc) Package Thickness <2.5 mm ≥2.5 mm Volume mm <350 235 °C 220 °C 3 Volume mm ≥350 220 °C 220 °C 3 Table 2. Pb-free Process – Classification Temperatures (Tc) Package Thickness <1.6 mm 1.6 mm – 2.5 mm ≥2.5 mm Volume mm <350 260 °C 260 °C 250 °C 3 Volume mm 350-2000 260 °C 250 °C 245 °C 3 Volume mm >2000 260 °C 245 °C 245 °C 3 Reliability Test Program Test item SOLDERABILITY HOLT PCT TCT HBM MM Latch-Up Method JESD-22, B102 JESD-22, A108 JESD-22, A102 JESD-22, A104 MIL-STD-883-3015.7 JESD-22, A115 JESD 78 Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 17 Description 5 Sec, 245°C 1000 Hrs, Bias @ Tj=125°C 168 Hrs, 100%RH, 2atm, 121°C 500 Cycles, -65°C~150°C VHBM≧2KV VMM≧200V 10ms, 1tr≧100mA www.anpec.com.tw APW7277 Customer Service Anpec Electronics Corp. Head Office : No.6, Dusing 1st Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 2F, No. 11, Lane 218, Sec 2 Jhongsing Rd., Sindian City, Taipei County 23146, Taiwan Tel : 886-2-2910-3838 Fax : 886-2-2917-3838 Copyright ANPEC Electronics Corp. Rev. A.2 - Sep, 2013 18 www.anpec.com.tw