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UCC1837 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC1837 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 14 page UCC1837 UCC2837 UCC3837 SLUS228A - AUGUST 1999 FEATURES • On Board Charge Pump to Drive External N-MOSFET • Input Voltage as Low as 3V • Duty Ratio Mode Over Current Protection • Extremely Low Dropout Voltage • Low External Parts Count • Output Voltages as Low as 1.5V 8-Pin N-FET Linear Regulator Controller 1 5 2 8 6 3 4 7 CHARGE PUMP CAP LEVEL SHIFT 1.5V REF UVLO TIMER CURRENT SENSE COMPARATOR COMP CT CS VDD CURRENT SENSE AMPLIFIER VOUT FB GND 100mV 140mV ERROR AMPLIFIER BLOCK DIAGRAM UDG-99145 DESCRIPTION The UCC3837 Linear Regulator Controller includes all the features re- quired for an extremely low dropout linear regulator that uses an external N-channel MOSFET as the pass transistor. The device can operate from input voltages as low as 3V and can provide high current levels, thus pro- viding an efficient linear solution for custom processor voltages, bus ter- mination voltages, and other logic level voltages below 3V. The on board charge pump creates a gate drive voltage capable of driving an external N-MOSFET which is optimal for low dropout voltage and high efficiency. The wide versatility of this IC allows the user to optimize the setting of both current limit and output voltage for applications beyond or between standard 3-terminal linear regulator ranges. This 8-pin controller IC features a duty ratio current limiting technique that provides peak transient loading capability while limiting the average power dissipation of the pass transistor during fault conditions. See the Application Section for detailed information. |
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