Catalog(2 parts)
| Part | Clock Sync▲▼ | Frequency - Switching▲▼ | Package / Case▲▼ | Package / Case | Output Configuration | Control Features | Duty Cycle (Max)▲▼ | Topology | Number of Outputs▲▼ | Output Phases▲▼ | Function | Mounting Type | Voltage - Supply (Vcc/Vdd)▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Synchronous Rectifier▲▼ | Output Type | Operating Temperature▲▼ | Operating Temperature▲▼ | Supplier Device Package | Package / Case▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
100000 Hz | 0.003899999894201755 m | 8-SOIC | Positive | Current Limit, Ramp | 0.9200000166893004 ul | Buck | 1 ul | 1 ul | Step-Down | Surface Mount | 4.75 V | 30 V | Transistor Driver | 70 °C | 0 °C | 8-SOIC | ||||
100000 Hz | 0.007619999814778566 m | 8-DIP | Positive | Current Limit, Ramp | 0.9200000166893004 ul | Buck | 1 ul | 1 ul | Step-Down | Through Hole | 4.75 V | 30 V | Transistor Driver | 70 °C | 0 °C | 8-PDIP | 0.007619999814778566 m |
Key Features
• Simple Single Inductor Buck PWM Stepdown Voltage RegulationDrives External PMOS SwitchContains UVLO CircuitIncludes Pulse-by-Pulse Current LimitLow 50µA Sleep Mode CurrentSimple Single Inductor Buck PWM Stepdown Voltage RegulationDrives External PMOS SwitchContains UVLO CircuitIncludes Pulse-by-Pulse Current LimitLow 50µA Sleep Mode Current
Description
AI
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 switching 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 50uA, making the UC3573 ideal for battery powered applications.
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 switching 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 50uA, making the UC3573 ideal for battery powered applications.