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The L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the Rth(j-amb) down to approximately 40 °C/W. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus, available in all computer related applications. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.
Key Features
- 2.5 A internal switch
- Operating input voltage from 4 V to 36 V
- 3.3 V / (±2%) reference voltage
- Output voltage adjustable from 1.235 V to 35 V
- Low dropout operation: 100 % duty cycle
- 250 kHz internally fixed frequency
- Voltage feedforward
- Zero load current operation
- Internal current limiting
- Synchronization
- Adjustable soft-start time
- Inhibit for zero current consumption
- Protection against feedback disconnection
- Thermal shutdown
Sample & Buy
| Part Number | Package | Packing Type | Marketing Status | Budgetary Price (US$)* | Quantity | ECCN (US) | Country of Origin | Order from Distributors | Order from ST |
|---|---|---|---|---|---|---|---|---|---|
| L5973D | PowerSO-8 | Tube |
Active
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1.038 | 10000 | EAR99 | CHINA | Check Availability | Buy now |
| L5973D013TR | PowerSO-8 | Tape And Reel |
Active
|
1.038 | 10000 | EAR99 | CHINA | Check Availability | Get sample |
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors
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Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISA101V1 -- 2 A DC step-down switching regulator with 4 V/36 V input voltage range based on the L5973D Part Number2 A DC step-down switching regulator with 4 V/36 V input voltage range based on the L5973D
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| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L5973D |
Active
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PowerSO-8 | Industrial | Ecopack2 | |
| L5973D013TR |
Active
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PowerSO-8 | Industrial | Ecopack2 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
