Product overview
Description
The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical RDS(on) of 0.15Ω) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 40V cover the majority of the today applications. Features of this new generation of DC-DC converter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown. Packages available are in plastic dual in line, DIP- 18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly.-
All features
- Inhibit for zero current consumption (100mA at VCC= 24V)
- Input/output synchronization function
- Thermal shutdown
- Protection against feedback disconnection
- Soft start function
- Output over voltage protection
- Internal current limiting (pulse by pulse and HICCUP mode)
- Zero load current operation (min 1mA)
- Up to 3.5A step down converter
- 3.3V and 5.1V (±1%) fixed output, and adjustable outputs from:
0.5V to 50V (3.3 type) 5.1V to 50V (5.1 type) - Operating input voltage from 8V to 55V
- Voltage feed forward
- Precise 5.1V (1.5%) reference voltage externally available
- Frequency adjustable up to 300kHz
Circuit Diagram
Featured Videos
All resources
| Resource title | Latest update |
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Product Specifications (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 19 Sep 2016 |
19 Sep 2016
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Application Notes (2)
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| 13 Sep 2018 |
13 Sep 2018
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| 13 Sep 2018 |
13 Sep 2018
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Technical Notes & Articles (1)
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| 20 Jan 2020 |
20 Jan 2020
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Design Notes & Tips (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 16 Jul 2019 |
16 Jul 2019
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Brochures (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 23 Mar 2020 |
23 Mar 2020
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EDA Symbols, Footprints and 3D Models
STMicroelectronics - L4973
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
Symbols
Footprints
3D models
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L4973D3.3 |
Active
|
SO-20 | Industrial | Ecopack2 | |
| L4973D3.3-013TR |
Active
|
SO-20 | Industrial | Ecopack1 (*) | |
| L4973D5.1 |
Active
|
SO-20 | Industrial | Ecopack2 |
|
| L4973D5.1-013TR |
Active
|
SO-20 | Industrial | Ecopack2 |
|
| L4973V3.3 |
Active
|
PDIP 18 | Industrial | Ecopack1 | |
| L4973V5.1 |
Active
|
PDIP 18 | Industrial | Ecopack1 |
L4973D5.1
Package:
SO-20Material Declaration**:
L4973D5.1-013TR
Package:
SO-20Material Declaration**:
(**) 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.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L4973D3.3 | 4 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tube | SO-20 | - | - | MALAYSIA | 1.811 / 1k | |
| L4973D5.1-013TR | 3 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SO-20 | - | - | MALAYSIA | 1.861 / 1k | |
| L4973V3.3 | 3 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tube | PDIP 18 | - | - | MALAYSIA | 1.693 / 1k | |
| L4973D3.3-013TR | 3 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | SO-20 | - | - | MALAYSIA | 1.811 / 1k | |
| L4973D5.1 | 4 distributors | Buy Direct |
Active
|
EAR99 | NEC | Tube | SO-20 | - | - | MALAYSIA | 1.861 / 1k | |
| L4973V5.1 | 5 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tube | PDIP 18 | - | - | MALAYSIA | 1.778 / 1k | |
(*) 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