AX3071UA

AX3071 Wide Input Range CC/CV Step Down Controller GENERAL DESCRIPTION The AX3071 is a step down PWM controller with a driving dual output current to 4.8A (2.4A+2.4A). It is designed to allow for operating a wide supply voltage range from 9V to 40V. The external shutdown function can be controlled by logic level to pull COMP/EN pin down, and then comes into standby mode. The external compensation makes feedback control have good line and load regulation with flexible external design. The AX3071 operates in the CC(Constant output Current) mode or CV(Constant output Voltage) mode, and the OCP current value is set by current sensing resisters. The AX3071 is suitable for the DC/DC switching power applications when requested the current limit function. The devices are available in MSOP-10L packages and require very few external devices for operation. FEATURES - VIN Operate with 9V ~ 40V Supply Voltage VOUT Accuracy (VREF =1.0V) ±2.0% Dual-Channeling CC/CV Mode Control External Current Limit Setting for 2 channel Over Temperature Protection Internal Soft Start ~ 3ms Fixed Frequency 120KHz UVLO Protection (min=7V, typ=7.5V, max=8V) Duty Cycle Range (0~90%) Single Pin to External Compensation and Shutdown Control COUT MLCC support. Built in Adjustable Line-Compensation MSOP-10L Package APPLICATION - Car Charger High-Brightness Lighting Portable Charger Devices General-Purpose DC/DC Controller with Current Limit 1/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 BLOCK DIAGRAM Over Temperature Protection POR VIN Internal Regulator 5V 5V FB 0.36V + Fault Logics UVP BS - 0.4V + UG VREF + - ERROR AMPLIFIER + COMP Cable COMP SEN1 0.1V SEN2 0.1V Current Sensor1 Gate Control LX ramp Current Sensor2 LG Oscillator 120KHz Zero Current Detection GND PIN ASSIGNMENT The package of AX3071 is MSOP-10L the pin assignment is given by: (Top View) VIN 1 10 BS COMP 2 9 LX FB 3 AX3071 8 UG SEN2 4 7 LG SEN1 5 6 GND MSOP-10L 2/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 Name VIN COMP FB SEN2 SEN1 GND LG UG LX BS Description Power Supply Input. Bypass this pin with a 1uF ceramic capacitor to GND, placed as close to the IC as possible. Error Amplifier Output. This is the output of the error amplifier (EA) and the non-inverting input of the PWM comparator. Use this pin in combination with the FB pin to compensate the voltage control feedback loop of the converter. Pulling COMP to a level below 0.4V nominal disables the controller, causes the oscillator to stop, and makes the UGATE and LGATE outputs held low. Feedback Pin. The voltage at this pin is regulated to 1.0V. Connect to the resistor divider between output and GND to set the output voltage. The Current Sense Input2 (+) Pin. When the SEN2 is larger than the current sense voltage, OCP function will enable. The Current Sense Input1 (+) Pin. When the SEN1 is larger than the current sense voltage, OCP function will enable. Ground. Connect this pin to a large PCB copper area for best heat dissipation, Return FB, and COMP to this GND and connect this GND to power GND at a single point for best noise immunity. Output to Low-side Gate Driver. Output to High-side Gate Driver. Power Switching Output to External Inductor. Bootstrap Pin. This provides power to the internal higher MOSFET gate driver. Connect a 100nF capacitor from BS pin to LX pin. ORDER/MARKING INFORMATION Order Information Top Marking Logo AX 3 0 7 1 Y Y W WX Part number ID code: internal WW: 01~52 Year: 11=2011 12=2012 : : 19=2019 3/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 ABSOLUTE MAXIMUM RATINGS (at TA = 25°C) Characteristics Supply Input Voltage BS to LX LX to GND BS, UG to GND FB, COMP, LG,SEN1, SEN2 to GND ESD HBM (Human Body Mode) ESD MM (Machine Mode) Power Dissipation, PD @TA=25°C Thermal Resistance from Junction to case Thermal Resistance from Junction to ambient Symbol VIN PD θJC θJA Rating -0.3 to +43 -0.3 to +7 -1 to +VIN+1 VSW-0.3 to VSW+7 0.3 to +7 ±2K ±200 ( TJ-TA ) / θJA 43 135 Unit V V V V V V V W °C/W °C/W RECOMMENDED OPERATION CONDITIONS Characteristics Storage Temperature Range Junction Temperature Operating Temperature Lead Temperature Range(Soldering 10sec) Symbol TST TJ TOP Rating -65 to +150 -40 to +125 -40 to +85 260 Unit °C °C °C °C 4/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 ELECTRICAL CHARACTERISTICS VCC=12V, TA=25°C (unless otherwise specified.) Mosfet use AMS4004*2. Characteristics Symbol Test Conditions Min Typ Max Units Supply Voltage Range VIN VCC 9 - 40 V ICCQ COMP/EN=GND - 2 - mA Supply Input Current ICC 12Vin Vout=5V,No load - 7.5 - mA ICC 30Vin Vout=5V,No load - 15 20 mA Power-On-Reset VCCRTH VCC Rising. 7 7.5 8 VCC POR Threshold V VCCFTH VCC Falling. 6 6.5 7 Oscillator Normal PWM Frequency FOSC IOUT=200mA 96 120 144 KHz Minimum On-Time TON-MIN - 200 - ns Duty Cycle Range Duty 0 - 90 % Reference VREF - 1.0 V Reference Voltage -2 - +2 % Reference Voltage Tolerance Line compensation Current IFB VSEN1 or VSEN2 =100mV - 5 - uA PWM Error Amplifier - 0.4 V COMP Shutdown Threshold Voltage VCOMP=VCOMP_H -1V - 132 - uA COMP Source Current VCOMP=1V - 126 - uA COMP Sink Current Current Sense Amplifier Difference Voltage between △VSEN 95 100 105 mV SEN- and SEN+ Pre-Driver (Ensured by design) source - 7 Ω UG Driver sink - 1.5 Ω source - 10 Ω LG Driver sink - 1.2 Ω UG low to LG high - 40 - nS Dead Time LG low to UG high - 100 - nS 5/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 ELECTRICAL CHARACTERISTICS VCC=12V, TA=25°C (unless otherwise specified.) Mosfet use AMS4004*2. Characteristics Symbol Test Conditions Min Typ Max Units Protection - 160 - °C Over Temperature Shutdown - 40 - °C Over Temperature Hysteresis Soft Start TSS - 3 - ms Soft Start Time - 0.5 s Recycle Time Output Short Circuit Protect Section VSCP - 0.4 V Short Circuit Fold Back Voltage Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: Devices are ESD sensitive. Handling precaution recommended. Note 3: θJA is measured in the natural convection at TA = 25°C on a high effective thermal conductivity test board of JEDEC 51-7 thermal measurement standard. APPLICATION CIRCUIT VIN =10V~40V INPUT R7 C4 IN 10R C1 100uF C8 UG C9 4.7uF~10uF R4 Q1 AMS4004 0R~10R 4.7uF~10uF LX AX3071 COMP LG R8 10R R5 0R~10R OUTPUT L1 33uH Q2 AMS4004 R6 R2 4.7R C7 12K C5 C6 1nF 470uF 2.2nF R1 C2 0.1uF BS 4.7K FB C3 SEN1 R3 3K 15pF 2.2nF GND SEN1 SEN2 RS1 SEN2 36mR for 2.4A RS2 36mR for 2.4A Note: If output only 1 port, the other Sense pin need connect with GND. 6/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 QC2.0 APPLICATION CIRCUIT MLCC OUTPUT CAPACITOR APPLICATION VIN =10V~40V INPUT R7 C4 IN C1 100uF C8 UG C10 4.7uF~10uF R4 Q1 AMS4004 0R~10R 4.7uF~ 10uF LX AX3071 COMP LG R8 10R R5 0R~10R OUTPUT L1 33uH Q2 AMS4004 R6 4.7R C7 R2 12K 2.2nF R1 C2 0.1uF BS 10R FB 1K R3 C5 C6 C9 1nF 100uF MLCC 100uF MLCC RS1 RS2 3K 1nF SEN1 C3 10nF GND SEN1 SEN2 SEN2 7/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 MOSFET SUGGESTION AMS4004*2 for 4.8A AMBA4810 for 4.8A~6A AMS4006*2 for 6A~8A 2.4A+2.4A or 4.8A 2.4A+2.4A or 2A+2A+2A or 6A 2A+2A+2A or 2A+2A+2A+2A or 8A 8/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev1.5 Nov.24, 2016 AX3071 FUNCTION DESCRIPTIONS CC/CV Mode Control The AX3071 provides CC/CV function. The Constant output Current control Mode and Constant output Voltage control Mode. Over Current Protection The AX3071 provides over current protection. A drop voltage on the current sensing resister is over the OCP value, the OCP function will shut down the controller. Soft Start The AX3071 has internal soft start function to control rise rate of the output voltage and limits the large inrush current at start up. The typical soft start interval is about 3mS. Power on Reset A power-on reset circuit monitors the input voltage. When the input voltage exceeds 7.5V, the converter will start operation. Once input voltage falls below 6.5V, the controller will shut down. Over Temperature Protection The AX3071 provides over temperature protection. The OTP will shut down the converter when junction temperature exceeds 160°C. Once the junction temperature cools down by approximately 40°C, the converter will resume normal operation. Current Limit Protection The Current limit is set by outside resistance (RSENSE), When the SEN1 or SEN2 voltage larger than 100mV, the current limit is happened that driver can be turned off. The current limit set according to the following equation: 100mV Current Limit (A) = R SENSE Output Short-Circuit Protection The AX3071 provides output short-circuit protection function. When VOUT is short (VFB