uc3750 Unisonic Technologies, uc3750 Datasheet
uc3750
Available stocks
Related parts for uc3750
uc3750 Summary of contents
Page 1
... Moreover ideal for portable applications profited from Chip Enable (CE) to reduce IC off-stage current and integrated feedback resistor network. The UTC UC3750 is suitable for applications, such as PDA, camcorders and digital still camera, hand-held instrument, distributed power system, computer peripheral, conversion from four NiMH or NiCd or one Lithium-ion cells to 3 ...
Page 2
... UC3750 MARKING INFORMATION PACKAGE VOLTAGE CODE 27: 2.7V SOT-25 33: 3.3V PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME Chip Enable pin, active high (internal pull-up current source). By connecting this pin GND, the switching operation of the controller will be stopped. 2 GND Ground Connection Output voltage monitoring input. This pin must be connected to the regulated output ...
Page 3
... UC3750 BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Preliminary CMOS QW-R502-360.a ...
Page 4
... Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER Junction to Ambient ELECTRICAL CHARACTERISTICS (Ta = 25°C (TYP. value), -40°C ≤ Ta ≤ 85°C (MIN. and MAX. values), unless otherwise specified) UC3750-27(2.7V) PARAMETER TOTAL DEVICE Input Voltage Output Voltage Input Current into V ...
Page 5
... UC3750 ELECTRICAL CHARACTERISTICS UC3750-33(3.3V) PARAMETER TOTAL DEVICE Input Voltage Output Voltage Input Current into V Pin OUT Operating Current Off-State Current OSCILLATOR Frequency Maximum Duty Cycle Switchover ON Time Threshold (Note) Soft-Start Delay Time (Note) Protection Delay Time OUTPUT DRIVE (EXT) EXT “H” Output Current EXT “ ...
Page 6
... Low Power Shutdown Mode Once the CE pin is tied to GND the UTC UC3750 can’t work. In shutdown mode, the internal reference, oscillator, control circuitry, driver and internal feedback voltage divider are turned off and the output voltage falls Because most of the internal circuits can’ ...
Page 7
... DS (ON) 9. P-Channel Power MOSFET Selection The operation of UTC UC3750 must be used with an external P-Channel power MOSFET. The main keys for the power MOSFET are the gate threshold, V voltage operation need a low gate threshold device that can work down to the minimum input voltage level. R determines the conduction losses for each switching cycle, the lower the ON resistance, the higher and the efficiency can be achieved ...
Page 8
... UC3750 DESCRIPTION INFORMATION(Cont.) 12. PCB Layout Recommendations Good PCB layout is important in switching mode power conversion. Careful PCB layout can minimize ground bounce, EMI noise and unwanted feedbacks that can affect the converter performance. 13. Grounding The output power return ground, the input power return ground and the device power ground should be connected at the Star-ground ...
Page 9
... UC3750 TYPICAL APPLICATION CIRCUIT GND UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein ...