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UC3573

Features: ` Simple Single Inductor Buck PWM Stepdown Voltage Regulation` Drives External PMOS Switch` Contains UVLO Circuit` Includes Pulse-by-Pulse Current Limit` Low 50A Sleep Mode CurrentPinoutSpecificationsVCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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SeekIC No. : 004535561 Detail

UC3573: Features: ` Simple Single Inductor Buck PWM Stepdown Voltage Regulation` Drives External PMOS Switch` Contains UVLO Circuit` Includes Pulse-by-Pulse Current Limit` Low 50A Sleep Mode CurrentPinoutSp...

UC3573 Data Sheet

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Part Number:
UC3573
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` Simple Single Inductor Buck PWM Stepdown Voltage Regulation
` Drives External PMOS Switch
` Contains UVLO Circuit
` Includes Pulse-by-Pulse Current Limit
` Low 50A Sleep Mode Current


Pinout

Connection Diagram


Specifications

VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
EAINV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6V to VCC
IEAOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
RAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3V to 4V
CS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3V to VCC
IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7A to 0.7A
I3VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .15mA
Storage Temperature . . . . . . . . . . . . . . . . .65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . +300°C

Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.


Description

The UC3573 is a Buck pulse width modulator which steps down and regulates a positive input voltage. The chip is optimized for use in a single inductor buck s witching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3573 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Input current can be sensed and limited to a user determined maximum value. In addition, a sleep comparator interfaces to the UVLO circuit which turns the chip off when the input voltage is below the UVLO threshold. This reduces the supply current to only 50mA, making the UC3573 ideal for battery powered applications.




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