UC2573D
ActiveBUCK PULSE WIDTH MODULATOR STEPDOWN VOLTAGE REGULATOR
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UC2573D
ActiveBUCK PULSE WIDTH MODULATOR STEPDOWN VOLTAGE REGULATOR
Technical Specifications
Parameters and characteristics for this part
| Specification | UC2573D |
|---|---|
| Clock Sync | False |
| Control Features | Ramp, Current Limit |
| Duty Cycle (Max) [Max] | 92 % |
| Frequency - Switching | 100 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | 8-SOIC |
| Package / Case [x] | 0.154 in |
| Package / Case [y] | 3.9 mm |
| Supplier Device Package | 8-SOIC |
| Synchronous Rectifier | False |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 30 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 4.75 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tube | 1 | $ 3.66 | |
| 10 | $ 3.29 | |||
| 75 | $ 3.11 | |||
| 150 | $ 2.70 | |||
| 300 | $ 2.56 | |||
| 525 | $ 2.30 | |||
| 1050 | $ 1.94 | |||
| 2550 | $ 1.84 | |||
| 5025 | $ 1.77 | |||
| Texas Instruments | TUBE | 1 | $ 3.21 | |
| 100 | $ 2.81 | |||
| 250 | $ 1.97 | |||
| 1000 | $ 1.59 | |||
Description
General part information
UC2573 Series
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.
Documents
Technical documentation and resources