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Analog Devices Inc. LT3970IDDB-3.3#TRMPBF
- Part No.:
- LT3970IDDB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970IDDB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,172
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Product details
Overview
LT3970IDDB-3.3#TRMPBF from Analog Devices is a 40V, 350mA fixed-output step-down regulator in a 10-lead (3mm × 2mm) DFN package, featuring 2.5µA quiescent current, integrated boost and catch diodes, and a power good flag. It delivers stable 3.3V output for automotive battery regulation, portable power, and industrial supplies with low ripple Burst Mode operation.
For engineers reviewing the LT3970IDDB-3.3#TRMPBF datasheet, LT3970IDDB-3.3#TRMPBF pinout, LT3970IDDB-3.3#TRMPBF application, or LT3970IDDB-3.3#TRMPBF equivalent, key selection factors include its 3.3V fixed output, –40°C to 125°C operating junction temperature, 0.7µA shutdown current, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970IDDB-3.3#TRMPBF implements constant-frequency current-mode control with internal compensation and an adjustable switching frequency (200kHz–2.2MHz) set via external RT resistor. Its monolithic architecture integrates bipolar NPN switch, boost diode, catch diode, oscillator, error amplifier, and power-good comparator.
Burst Mode operation maintains high efficiency at light loads while limiting output ripple to <5mVP-P; the 1V enable threshold with 30mV hysteresis and 90% VOUT power-good detection support robust system-level sequencing and fault monitoring in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 125°C; enables direct replacement of LDOs without feedback divider. |
| Input Voltage Range | 4.2V to 40V operating; supports wide automotive battery transients and industrial input rails. |
| Max Output Current | 350mA continuous; limited by valley current sense on integrated catch diode. |
| Quiescent Current | 2.5µA at 12VIN → 3.3VOUT; enables always-on systems with multi-year battery life. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT pin; allows optimization of inductor size vs. efficiency. |
| Shutdown Current | 0.7µA; ensures minimal parasitic drain during system sleep modes. |
| Power Good Threshold | 90% of nominal output (2.97V); open-drain PG pin signals valid regulation with 12mV hysteresis. |
Pinout & Package
LT3970IDDB-3.3#TRMPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for thermal management (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Fixed-output voltage node | Internally regulated 3.3V reference; connects directly to output capacitor and load. |
| EN (Pin 2) | Enable control input | Hysteretic 1V rising threshold; pulls low to shut down IC and reduce IQ to 0.7µA. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF). |
| GND (Pins 4, 5) | Signal and power ground | Low-impedance return path for control logic and power stage; ties to exposed pad (Pin 11). |
| SW (Pin 6) | Switch node | Drives external inductor; carries high dI/dt; must be routed with minimal loop area. |
| BOOST (Pin 7) | Bootstrap drive supply | Provides >VIN voltage to fully saturate internal NPN switch; requires external capacitor to SW. |
| BD (Pin 8) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V. |
| PG (Pin 9) | Power good flag | Open-drain output active low until VOUT reaches 90%; requires external pull-up resistor. |
| RT (Pin 10) | Frequency programming | Resistor-to-ground sets switching frequency; 226kΩ yields ~600kHz per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated diodes | Eliminates external boost and catch diodes-reduces BOM count, PCB area, and layout complexity. |
| Low ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while sustaining 2.5µA IQ, critical for noise-sensitive analog circuits. |
| AEC-Q100 qualification | Rated for automotive applications (Grade I: –40°C to 125°C), supporting under-hood and infotainment power rails. |
| Internal compensation | Removes need for external compensation network-simplifies design, improves stability across input/output conditions. |
| Catch diode current limit | Valley-current protection at ~400mA prevents damage during short-circuit or overload events without external sensing. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rail to 3.3V for microcontrollers and sensors in ADAS modules. IC Role / Device Role / Timing Role: Primary DC/DC converter providing clean, sequenced 3.3V supply with PG signaling for MCU boot validation. Use Value: Withstands cold-crank (4.2V) and load-dump (40V) transients while maintaining 2.5µA quiescent draw for ECU sleep mode compliance. | Use Scenario: Powering GPS receivers and BLE radios in handheld medical devices requiring long battery life. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering regulated 3.3V from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline inputs. Use Value: 0.7µA shutdown current and Burst Mode efficiency extend battery runtime beyond 12 months in standby. |
| Industrial Sensor Node Supply | Factory Automation I/O Module |
Use Scenario: Providing isolated 3.3V power to MEMS accelerometers and temperature sensors in wireless condition-monitoring nodes. IC Role / Device Role / Timing Role: Primary power stage converting 24V industrial bus to low-noise 3.3V for precision ADCs and RF transceivers. Use Value: Integrated diodes and <5mVP-P ripple eliminate need for post-regulation LDOs-reducing component count and board space. | Use Scenario: Powering digital isolators and PLC input circuitry in DIN-rail mounted I/O modules with 24V DC input. IC Role / Device Role / Timing Role: Robust 3.3V supply with PG flag enabling safe startup sequencing before fieldbus communication initialization. Use Value: AEC-Q100 qualification and –40°C to 125°C operation ensure reliability in uncontrolled factory environments with ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV-3.3#TRPBF | 42V input, 2.5A output, 2.5µA IQ, same 3.3V fixed output but larger 16-lead 3mm × 4mm LQFN package. | Higher current capability suits motor drivers or multi-rail systems; not pin-compatible due to different pin count and layout. | Select when >350mA load or higher thermal margin is required; rework PCB layout needed. |
| TPS62865ARGRR | 6V max input, 4A output, 0.35µA IQ, 3.3V fixed, 12-pin 2mm × 2mm QFN; lacks AEC-Q100 and 40V rating. | Optimized for low-voltage battery-powered apps only; unsuitable for automotive or wide-input industrial use. | Choose only for compact, low-IQ consumer designs with ≤6V input; no automotive qualification. |
Compared with LT8609SIV-3.3#TRPBF and TPS62865ARGRR, the LT3970IDDB-3.3#TRMPBF uniquely balances 40V input tolerance, AEC-Q100 qualification, 350mA output, and ultra-low 2.5µA quiescent current in a miniature 3mm × 2mm DFN-making it optimal for space-constrained automotive and industrial buck applications where wide VIN and low IQ are non-negotiable.
Availability
LT3970IDDB-3.3#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and industrial sensor node supply requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3970IDDB-3.3#TRMPBF 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 wide-input, low-quiescent-current DC/DC conversion in automotive and harsh-environment industrial applications-emphasizing integration, reliability, and transient robustness.
FAQ
What is the guaranteed output voltage accuracy of the LT3970IDDB-3.3#TRMPBF over temperature?
The LT3970IDDB-3.3#TRMPBF guarantees 3.3V output within ±1.2% over its full operating junction temperature range of –40°C to 125°C, as specified in the Electrical Characteristics table (min 3.26V, typ 3.3V, max 3.34V). This accuracy is achieved via laser-trimmed internal feedback resistors and is independent of external components.
Does the LT3970IDDB-3.3#TRMPBF require an external feedback resistor divider?
No, the LT3970IDDB-3.3#TRMPBF does not require an external feedback resistor divider. As a fixed-output variant, it internally regulates the VOUT pin (Pin 1) to 3.3V using factory-programmed resistors-eliminating external components and simplifying layout versus adjustable versions like the LT3970.
What is the minimum input voltage required for the LT3970IDDB-3.3#TRMPBF to regulate 3.3V output?
The LT3970IDDB-3.3#TRMPBF requires a minimum input voltage of 4.2V to operate and regulate 3.3V output, as defined in its Absolute Maximum Ratings and Electrical Characteristics. Below 4.2V, the device cannot sustain regulation-even if EN is asserted-and will drop out of regulation.
How does the power good (PG) flag on the LT3970IDDB-3.3#TRMPBF behave during startup?
The PG pin on the LT3970IDDB-3.3#TRMPBF remains low until the VOUT pin reaches 90% of its nominal 3.3V output (i.e., 2.97V), then transitions high via an open-drain output. PG is valid only when EN is high and VIN exceeds 4.2V, providing reliable power sequencing feedback for downstream logic.
Is the LT3970IDDB-3.3#TRMPBF pin-compatible with other LT3970 variants in the DFN package?
Yes, the LT3970IDDB-3.3#TRMPBF shares identical pinout and footprint with all other LT3970 DFN variants (e.g., LT3970IDDB#TRMPBF, LT3970IDDB-5#TRMPBF), including same 10-lead (3mm × 2mm) DFN layout and exposed thermal pad. Only the VOUT pin function differs-fixed 3.3V instead of adjustable FB-requiring no PCB changes for drop-in substitution.
LT3970IDDB-3.3#TRMPBF 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)
LT3970IDDB-3.3#TRMPBF FAQ
1.How can I place an order for LT3970IDDB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970IDDB-3.3#TRMPBF 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 LT3970IDDB-3.3#TRMPBF reliable?
The price and inventory of LT3970IDDB-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970IDDB-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970IDDB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970IDDB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970IDDB-3.3#TRMPBF?
LT3970IDDB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970IDDB-3.3#TRMPBF 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 LT3970IDDB-3.3#TRMPBF?
For technical support, including LT3970IDDB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970IDDB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LT3970IDDB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970IDDB-3.3#TRMPBF 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 LT3970IDDB-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970IDDB-3.3#TRMPBF?
All LT3970IDDB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970IDDB-3.3#TRMPBF, 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 LT3970IDDB-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970IDDB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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