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1、DESCRIPTION FEATURESThe BL8025 is a high-efficiency, DC-to-DC stepdown switching regulators, capable of delivering up to 1A of output current. The device operates from an input voltage range of 2.6V to 6.0V and provides an output voltage from 0.6V to VIN, making the BL8025 ideal for low voltage powe
2、r conversions. Running at a fixed frequency of 1.5MHz allows the use of small external components, such as ceramic input and output caps, as well as small inductors, while still providing low output ripples. This low noise output along with its excellent efficiency achieved by the internal synchrono
3、us rectifier, making BL8025 an ideal green replacement for large power consuming linear regulators. Internal soft-start control circuitry reduces inrush current. Short-circuit and thermal-overload protection improves design reliability.BL8025 is housed in a SOT23-5 PackageHigh Efficiency: Up to 96%C
4、apable of Delivering 1A (Vin 3.3V) 1.5MHz Switching FrequencyNo External Schottky Diode Needed Low dropout 100% Duty operation Internal Compensation and Soft-Start Current Mode control0.6V Reference for Low Output voltages Logic Control Shutdown (lq2000VNote: Exceed these limits to damage to the dev
5、ice. Exposure to absolute maximum rating conditions may affect device reliability.RECOMMENDED WORK CONDITIONSParameterValueInput Voltage RangeMax. 6VOpera ting Junction Temperature(Tj)-20 C -125 CELECTRICAL CHARACTERISTICS(VDD=5V, TA=25 C)SymbolParameterCon diti onsMinTypMaxUnitVDDInput Voltage Rang
6、e2.66.0VVrefFeedback VoltageVin=5V0.5850.60.615VIfbFeedback Leakage current0.10.4uAiqQuiescent CurrentActive, Vfb=0.65, No Switching40uAShutdown1uALnRegLine RegulationVin=2.7V to 5.5V0.040.2%/VLdRegLoad RegulationIout=0.01 to 1A0.10.2%/AFsoeSwitching Frequency1.31.51.7MHzRdsonPPMOS Rdson280350mohmRd
7、sonNNMOS Rdson190250mohmIlimitPeak Current LimitVin3.3V1.21.52AIswlkSW Leakage CurrentVout=5.5V, VSW=0 or 5.5 V, EN=0V10uAIenlkEN Leakage Current1uAVh enEN Input High Voltage1.5VVl enEN Input Low Voltage0.4VPIN DESCRIPTIONPIN #NAMEDESCRIPTION1VINSupply voltage.2GNDGround3ENEnable pin for the IC. Dri
8、ve the pin to high to enable the part, and low to disable4FBFeedback input. Connect an external resistor divider from the output to FB and GND to set the output to a voltage between 0.6V and Vin5SWInductor connection. Connect an inductor between SW and the regulator output.ELECTRICAL PERFORMANCETest
9、ed under TA=25C, unless otherwise specifiedEfficiency / Vout=3.3VVfb Vs. Temperature0.001 0.01 0.1 1Iout (A)Temperature gEfficfercy / vout=i.5V / vtn=3,7VKha mA)Load Regulation / vin=3JVlout mAEffidency / Vout=l,2V / Vtn=3,7VKmA mALoad Capabilrty at Law VinVout=1.2Viwr APower upOutput Ripple and SW
10、at 1A loadVin=6V / Vout=3.3Vit5DOCEJD9K 圖 14A MrSlSGg Wid旧 1B3EZ)12:2 DOW :5 凹 f 3 PDOT d 5D0E5 吒M2 HOB.!Ch1: Vin, Ch2: Vout, Ch3 SW, Ch4: I_inductorTiz.F4 4Ch1: Vin, Ch2: Vout, Ch3 ENBLOCK DIAGRAMDETAILED DESCRIPTIONThe BL8025 high-efficiency switching regulator is a small, simple, DC-to-DC step-do
11、wn converter capable of delivering up to 1A of output current. The device operates in pulse-width modulation (PWM) at 1.5MHz from a 2.6V to 5.5V input voltage and provides an output voltage from 0.6V to VIN, making the BL8025 ideal for on-board postregulation applications. An internal synchronous rectifier improves efficiency and eliminates the typical Schottky free-wheeling diode. Using the on resistance of the internal high-side MOSFET to sense switching currents eliminates current-sense resistors, further improving efficiency and cost.Loop Op
