G8089 Low-Supply-Current Synchronous Step-up DC-DC Converter General Description The G8089 is a compact, PFM mode, and step-up DC-DC converter with low quiescent current. The inter-nal synchronous rectifier reduces cost and PCB space. by eliminating the need for an external Schottky diode. Low on-resistance of the internal switches improves theefficiency up to 95%. The start-up voltage is guaranteed. below 1V. After start-up, the device can operate with input voltage down to 0.9V. The G8089 is suitable for por-table battery-powered applications. Consuming only 15mA quiescent current and an optimized control scheme al-lows the device to operate at very high efficiency over the entire load current range. Pin Configuration GM Micro Devices Features: 0.9V Typical Start-up Input Voltage 15mA Typical No Load Quiescent Current PFM Operation High Efficiency up to 95% Fixed 1.8V, 2.1V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5.5V Output Voltage 800mA Internal Switch CurrentInternal Synchronous Rectifier SOT-89 Package Lead Free and Green Devices Available. Simplified Application Circuit 1 G8089 BLOCK Diagram GM Micro Devices 2 G8089 Absolute Maximum Ratings Symbol Parameter Rating Unit VOUT Output Voltage (VOUT to GND) -0.5～8 V VLX LX to GND Voltage -0.5～Vout+1 V TSTG Storage Temperature -40-165 ℃ TSDR Maximum Lead Soldering Temperature, 10 Seconds 250 ℃ Electrical Characteristics Parameter Symbol Output Voltage △VOUT △VIN Maximum voltage input test Conditions Starting voltage Vstart ILOAD=1Ma,VIN:0→2V Maintai voltage Vhold ILOAD=1Ma,VIN:0→0V Oscillation signal duty ratio DCosc Efficiency η Current limit Imi NO load Current IIN0 Min. Max. unit -2.5 2.5V % 0.9 5.0 V 0.8 V 0.6 V 85 % 600 VIN=1.8V VOUT=3.0V Typical 90 94 % 800 1000 mA 15 uA GM Micro Devices 3 G8089 Typical Operating Characteristics (Refer to the application circuit in the section “Typical Application Circuit”, V =1.5V, L1=47UH, T =25 C unless otherwise noted.) GM Micro Devices 4 G8089 GM Micro Devices 5 G8089 Package Information GM Micro Devices 6 G8089 SOT89 GM Micro Devices 7 G8089 GM Micro Devices 8