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Analog Devices Inc. LT3970EDDB-3.3#TRPBF
- Part No.:
- LT3970EDDB-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,980
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Product details
Overview
LT3970EDDB-3.3#TRPBF from Analog Devices is a 40V input, 350mA fixed-output step-down regulator in a 3mm × 2mm DFN package, featuring 2.5µA quiescent current, integrated boost and catch diodes, and a power good flag. It delivers tightly regulated 3.3V output with ±1.2% accuracy over –40°C to 125°C and supports automotive battery regulation and portable power applications.
For engineers reviewing the LT3970EDDB-3.3#TRPBF datasheet, LT3970EDDB-3.3#TRPBF pinout, LT3970EDDB-3.3#TRPBF application, or LT3970EDDB-3.3#TRPBF equivalent, key selection criteria include its 350mA valley catch diode current limit, 200kHz–2.2MHz programmable switching frequency, low-noise Burst Mode operation (<5mVP-P ripple), and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970EDDB-3.3#TRPBF implements constant-frequency current-mode control with internal compensation, enabling fast transient response and stable loop behavior without external compensation components. Its monolithic architecture integrates a bipolar NPN switch, boost diode, catch Schottky diode, oscillator, error amplifier, and power-good comparator.
Burst Mode operation reduces quiescent current to 1.7µA at light loads while maintaining output regulation and sub-5mV ripple; the enable pin features a precise 1V threshold with 30mV hysteresis, and shutdown current is limited to 0.7µA. The device uses internal sense to limit catch diode current and includes thermal foldback via junction temperature monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 125°C; eliminates need for external feedback resistors. |
| Input Voltage Range | 4.2V to 40V operating; supports wide automotive and industrial supply rails including cold-crank and load-dump conditions. |
| Max Output Current | 350mA valley current limit on integrated catch diode; defines safe continuous load capability under thermal constraints. |
| Quiescent Current | 2.5µA at 12VIN to 3.3VOUT; enables multi-year battery life in always-on sensor and telematics modules. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT pin resistor; allows optimization of inductor size, efficiency, and EMI profile. |
| Output Ripple | <5mVP-P in typical Burst Mode operation; meets low-noise requirements for RF and precision analog subsystems. |
| Power Good Flag | Open-drain PG asserts when VOUT reaches 90% of 3.3V (i.e., ≥2.97V); provides reliable system power sequencing signal. |
Pinout & Package
LT3970EDDB-3.3#TRPBF is housed in a 10-lead, 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for enhanced thermal performance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VOUT) | Fixed-output voltage reference node | Internally connected to feedback divider; outputs regulated 3.3V; must be decoupled with ceramic capacitor. |
| Pin 2 (EN) | Enable control input | Hysteretic 1V rising threshold; pulls device into 0.7µA shutdown when low; requires VIN ≥ 4.2V for accurate operation. |
| Pin 3 (VIN) | Main power input | Supplies internal circuitry and switch; must be locally bypassed with ≥1µF X7R/X5R ceramic capacitor. |
| Pins 4, 5, 11 (GND) | Ground return paths | Multiple GND pins and exposed pad minimize impedance; all must be solidly connected to PCB ground plane. |
| Pin 6 (SW) | Switch node | Drives external inductor; carries high di/dt square wave; requires short, low-inductance layout to reduce EMI. |
| Pin 7 (BOOST) | Bootstrap drive voltage | Accepts external capacitor to generate >VIN voltage; ensures full saturation of internal bipolar NPN switch. |
| Pin 8 (BD) | Boost diode anode connection | Connects to external boost diode anode; also powers internal bias regulator when BD > 3.2V for improved efficiency. |
| Pin 9 (PG) | Power good open-drain output | Sinks current when VOUT < 2.97V; requires external pull-up; valid only when EN = high and VIN > 4.2V. |
| Pin 10 (RT) | Frequency setting input | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz; determines inductor/capacitor sizing trade-offs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates four external diodes; reduces BOM count, board area, and assembly cost in space-constrained designs. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while achieving 1.7µA IQ, critical for battery-powered IoT nodes. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature; validated for automotive battery regulation and infotainment power rails. |
| Internal current limiting | Separate 350mA catch diode valley limit and 700mA switch peak limit provide robust fault protection during shorts or overload. |
| Accurate power good flag | PG asserts at 90% of 3.3V (2.97V) with 12mV hysteresis; enables reliable microcontroller reset and system power sequencing. |
Applications
| Automotive Battery Regulation | Portable Medical Sensors |
|---|---|
Use Scenario: Powering CAN transceivers and microcontrollers in 12V vehicle electrical systems subject to cold-crank (down to 3.5V) and load-dump (up to 40V) transients. IC Role / Device Role / Timing Role: Primary DC/DC buck regulator delivering stable 3.3V rail from unregulated battery input. Use Value: 40V absolute max input rating and AEC-Q100 qualification ensure reliability across automotive operating conditions without external protection circuitry. |
Use Scenario: Long-life wearable ECG monitors powered by coin-cell batteries requiring ultra-low quiescent current and minimal output ripple. IC Role / Device Role / Timing Role: Main power supply converting battery voltage to clean 3.3V for analog front-end and BLE radio. Use Value: 2.5µA quiescent current extends battery life beyond 5 years; Burst Mode maintains <5mV ripple during sleep states. |
| Industrial PLC I/O Modules | Smart Building Controllers |
Use Scenario: Providing isolated 3.3V logic power in DIN-rail mounted programmable logic controllers with 24V DC field supplies. IC Role / Device Role / Timing Role: Secondary non-isolated buck stage after front-end isolation, powering FPGA configuration and communication ICs. Use Value: Integrated diodes and internal compensation reduce component count and layout complexity in dense I/O module PCBs. |
Use Scenario: Powering Zigbee and Thread wireless gateways deployed in HVAC control panels with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Regulated 3.3V supply for RF SoCs and environmental sensors in thermally constrained enclosures. Use Value: 125°C operating junction temperature and 76°C/W thermal resistance enable reliable operation without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3970EMS-3.3#TRPBF | Same silicon die in 10-lead MSOP package (θJA = 100°C/W); larger footprint but easier hand-soldering and rework. | Preferred for prototyping, low-volume industrial controls, or where DFN reflow capability is unavailable. | Select when thermal margin permits higher junction temperature rise or when MSOP handling simplifies assembly. |
| TPS62130ARGTR | 3V–17V input, 3A output, 17µA IQ; no integrated catch diode; requires external diode and compensation. | Higher current capability but lacks AEC-Q100 rating and automotive-grade reliability validation. | Choose only for non-automotive 3.3V applications needing >350mA, where external diode integration is acceptable. |
Compared with LT3970EMS-3.3#TRPBF, the LT3970EDDB-3.3#TRPBF offers 24% lower thermal resistance for higher power density; versus TPS62130ARGTR, it delivers automotive qualification, integrated diodes, and 7× lower quiescent current-critical for battery longevity and functional safety compliance.
Availability
LT3970EDDB-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical sensors, and industrial PLC I/O modules requiring stable component supply with long-term lifecycle assurance.
Supply support for LT3970EDDB-3.3#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3970 series was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in automotive and harsh-environment applications, emphasizing integration, reliability, and ease of use.
FAQ
What is the guaranteed output voltage accuracy of the LT3970EDDB-3.3#TRPBF over temperature?
The LT3970EDDB-3.3#TRPBF guarantees 3.3V output with ±1.2% accuracy across its full operating junction temperature range of –40°C to 125°C, as confirmed in the Electrical Characteristics table (Rev. D datasheet, page 4). This specification applies to the E-grade version and ensures stable logic-level power without external trimming.
Does the LT3970EDDB-3.3#TRPBF require external compensation components?
No, the LT3970EDDB-3.3#TRPBF features internal compensation, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces bill-of-materials cost, and improves consistency across production units-verified in the Block Diagram and Applications Information sections of the datasheet.
Can the LT3970EDDB-3.3#TRPBF operate with input voltages below 4.2V?
No-the LT3970EDDB-3.3#TRPBF has a minimum operating input voltage of 4.2V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Below this, the device cannot regulate output or assert the power good flag; for sub-4.2V operation, a different regulator such as the LT3971 or LTC3639 should be evaluated.
How does the power good (PG) flag behave during startup and fault conditions?
The PG pin of the LT3970EDDB-3.3#TRPBF remains low until VOUT reaches 90% of 3.3V (≥2.97V), then transitions high via open-drain output. It stays high only while EN is asserted and VIN > 4.2V; during overcurrent or thermal shutdown, PG goes low within microseconds, providing immediate fault signaling to host controllers.
Is the LT3970EDDB-3.3#TRPBF pin-compatible with other variants in the LT3970 family?
Yes-LT3970EDDB-3.3#TRPBF shares identical pinout and package with LT3970EDDB-5#TRPBF and LT3970EDDB-3.42#TRPBF. Only the internal feedback divider differs; all share same EN, PG, RT, BOOST, BD, SW, VIN, GND, and VOUT pin functions and locations per the DFN pin configuration diagram (page 2).
LT3970EDDB-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA
- Frequency - Switching:
- 200kHz ~ 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT3970EDDB-3.3#TRPBF FAQ
1.How can I place an order for LT3970EDDB-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB-3.3#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3970EDDB-3.3#TRPBF reliable?
The price and inventory of LT3970EDDB-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970EDDB-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB-3.3#TRPBF?
LT3970EDDB-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB-3.3#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3970EDDB-3.3#TRPBF?
For technical support, including LT3970EDDB-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3970EDDB-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB-3.3#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3970EDDB-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB-3.3#TRPBF?
All LT3970EDDB-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB-3.3#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3970EDDB-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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