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The LDF is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.6 V to 16 V.
It is available in fixed and adjustable output voltage versions, from 0.8 V to 12 V.
The LDF features are: high output precision, very low-dropout voltage, low noise, and low quiescent current, therefore suitable for low voltage microprocessors and memory applications.
Enable logic control pin and power-good output are featured on PPAK/DFN packages.
Current and thermal protection are provided.Key Features
- Input voltage from 2.6 to 16 V
- Very low-dropout voltage (500 mV max. at 1 A load)
- Low quiescent current (200 μA typ. @ 1 A load)
- Available in 1% precision in PPAK and DFN6 packages, 2% in DPAK
- 1 A guaranteed output current
- Wide range of output voltages available on request: adjustable from 0.8 V, fixed up to 12 V in 100 mV steps
- Logic-controlled electronic shutdown
- Power Good (PPAK and DFN packages)
- Fast dynamic response to line and load changes
- Internal current and thermal protections
- Temperature range: -40 °C to 125 °C
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All resources
Product Specifications (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 24 Oct 2020 |
24 Oct 2020
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Selection Guides (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 25 Mar 2020 |
25 Mar 2020
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Brochures (2)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 15 Feb 2019 |
15 Feb 2019
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| 26 Feb 2020 |
26 Feb 2020
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CAD/EDA Symbols, Footprints and Models
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| LDF18PT-TR |
Active
|
PPACK 5 | Industrial | Ecopack2 |
|
| LDF25PT-TR |
Active
|
PPACK 5 | Industrial | Ecopack2 |
|
| LDF33DT-TR |
Active
|
DPAK | Industrial | Ecopack2 | |
| LDF33PT-TR |
Active
|
PPACK 5 | Industrial | Ecopack2 |
|
| LDFPT-TR |
Active
|
PPACK 5 | Industrial | Ecopack2 | |
| LDFPUR |
Active
|
DFN6 3x3 | Industrial | Ecopack2 | |
| LDFPVR |
Active
|
DFN6 2x2 | Industrial | Ecopack2 |
LDF18PT-TR
Package:
PPACK 5Material Declaration**:
LDF25PT-TR
Package:
PPACK 5Material Declaration**:
LDF33PT-TR
Package:
PPACK 5Material 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) | Output Voltage (V) (nom) | Output Tolerance (typ) | Output Current (A) (nom) | Country of Origin | Budgetary Price (US$)*/Qty | More info | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||||
| LDFPT-TR | 6 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | PPACK 5 | -40 | 125 | - | 1 | 1 | CHINA | 0.476 / 1k | ||
| LDFPVR | 4 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | DFN6 2x2 | -40 | 125 | - | 1 | 1 | CHINA | 0.476 / 1k | ||
| LDFPUR | 6 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | DFN6 3x3 | -40 | 125 | - | 1 | 1 | CHINA | 0.476 / 1k | ||
| LDF33PT-TR | 5 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | PPACK 5 | -40 | 125 | 3.3 | 1 | 1 | CHINA | 0.549 / 1k | ||
| LDF25PT-TR | 1 distributors |
Active
|
EAR99 | NEC | Tape And Reel | PPACK 5 | -40 | 125 | 2.5 | 1 | 1 | CHINA | 0.549 / 1k | |||
| LDF18PT-TR | 1 distributors |
Active
|
EAR99 | NEC | Tape And Reel | PPACK 5 | -40 | 125 | 1.8 | 1 | 1 | CHINA | 0.549 / 1k | |||
| LDF33DT-TR | 6 distributors | Free Sample Buy Direct |
Active
|
EAR99 | NEC | Tape And Reel | DPAK | -40 | 125 | 3.3 | 2 | 1 | CHINA | 0.549 / 1k | ||
Marketing Status
ActiveECCN (US)
EAR99Budgetary Price (US$)*/Qty
0.549 / 1kMarketing Status
ActiveECCN (US)
EAR99Budgetary Price (US$)*/Qty
0.549 / 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