AX3120ESA

AX3120 2.5A Synchronous buck Converter  GENERAL DESCRIPTION AX3120 consists of step-down switching regulator with synchronous PWM converter. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and NMOS etc. AX3120 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter also contains an error amplifier circuit as well as an enable/soft-start circuit that prevents overshoot at startup. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an external compensation is easily to system stable. With the addition of internal PMOS and NMOS, a coil and capacitors externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L-EP package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V.  FEATURES - Input voltage：4.5V to 23V - Output voltage：VFB to VCC - Duty ratio：0% to 100% PWM control - Oscillation frequency：250KHz typ. - Enable/Soft-Start and Current Limit (CL). Thermal Shutdown function. Short Circuit Protect (SCP). Built-in internal SW P-channel and N-channel MOS. SOP-8L with Exposed Pad Pb-Free package. RoHS and Halogen free compliance. 1/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Oct.16, 2019 AX3120  BLOCK DIAGRAM EN/SS PVcc SVcc 6uA 3.5V VEN CLM Soft-Start PMOS FB PWM - Switched Control Circuit SW + NMOS 0.62V Oscillation Circuit SGND Thermal Shutdown PGND COMP  PIN ASSIGNMENT The package of AX3120 is SOP-8L-EP; the pin assignment is given by: Name ( Top View ) EN/SS 1 SGND 2 SVcc 3 PVcc 4 Exposed Pad (SW) SOP-8L-EP 8 COMP 7 FB 6 PGND 5 SW Description ON/OFF Shutdown and Soft-start EN/SS pin SGND Signal ground pin SVcc IC power supply pin PVCC Driver power supply pin Switch pin. Connect SW inductor here. PGND Power ground pin FB external Feedback pin COMP Compensation pin 2/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Oct.16, 2019 AX3120  ORDER/MARKING INFORMATION Top Marking (SOP-8L-EP) Order Information Logo AX3120 XX X Package Type ES: SOP-8L-EP 1 20 AXY Y3 WW X Part number ID code:internal WW: 01~52 Year: 18=2018 19=2019 20=2020 21=2021 22=2022 : 45=2045 Packing Blank : Tube A : Taping  ABSOLUTE MAXIMUM RATINGS (at TA=25°C) Characteristics Symbol Rating Unit SVCC,PVCC Pin Voltage VCC VSS - 0.3 to VSS + 24 V Feedback Pin Voltage VFB VSS - 0.3 to VCC V EN/SS Pin Voltage VEN/SS VSS - 0.3 to 5 V COMP Pin Voltage VCOMP VSS - 0.3 to 5 V Switch Pin Voltage VSW VSS - 0.3 to VCC + 0.3 V Power Dissipation PD Internally limited mW Storage Temperature Range TST -40 to +165 °C Junction Temperature Range TJ -40 to +150 °C Operating Supply Voltage VOP 4.5 to 23 V Thermal Resistance from Junction to case θJC SOP-8L-EP=15, °C/W Thermal Resistance from Junction to ambient θJA SOP-8L-EP=40, °C/W Note: θJA is measured with the PCB copper area(need connect to Exposed pad) of approximately 1 in2(Multi-layer). 3/13 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.6 Oct.16, 2019 AX3120  ELECTRICAL CHARACTERISTICS (VIN = 12V, VOUT=3.3V, TA=25°C, unless otherwise specified) Characteristics Symbol Conditions Feedback Voltage VFB IOUT=0.1A Feedback Bias Current IFB Quiescent Current ICCQ Shutdown Supply Current ISD IOUT=0.1A VFB=1.2V force driver off VEN =0V Switch Current Limit ISW-Lim VIN = 4.5V~23V, Line Regulation △ VOUT/VOUT Load Regulation △ VOUT/VOUT IOUT = 0.1A to 2.5A FOSC SW pin Short Oscillation Frequency FOSC1 VFB