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UCC2837

UNITRODE
Part Number UCC2837
Manufacturer UNITRODE
Description 8-Pin N-FET Linear Regulator Controller
Published Aug 27, 2017
Detailed Description 8-Pin N-FET Linear Regulator Controller UCC1837 UCC2837 UCC3837 FEATURES • On Board Charge Pump to Drive External N-MO...
Datasheet PDF File UCC2837 PDF File

UCC2837
UCC2837

Overview
8-Pin N-FET Linear Regulator Controller UCC1837 UCC2837 UCC3837 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 DESCRIPTION The UCC3837 Linear Regulator Controller includes all the features required 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 providing an efficient linear solution for custom processor voltages, bus termination 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.
BLOCK DIAGRAM VDD 1 CS 8 CAP 2 140mV CHARGE PUMP CURRENT SENSE AMPLIFIER LEVEL SHIFT 5 VOUT ERROR AMPLIFIER 6 FB 100mV UVLO CURRENT SENSE COMPARATOR TIMER 1.
5V REF 3 GND ++ SLUS228A - AUGUST 1999 7 CT 4 COMP UDG-99145 ABSOLUTE MAXIMUM RATINGS All pins referenced to GND .
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–0.
3V to +15V CS, CT, FB .
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–0.
3V to VDD + 0.
3V Storage Temperature .
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–65°C to +150°C Junction Temperature .
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–55°C to +150°C Lead Temperature (Soldering, 10sec.
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+300°C Currents are positive into, ...


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