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Analog Devices Inc. LT3970EDDB-3.42#TRMPBF
- Part No.:
- LT3970EDDB-3.42#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB-3.42#TRMPBF.pdf
- Description:
- IC REG BUCK 3.42V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
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Product details
Overview
LT3970EDDB-3.42#TRMPBF from Analog Devices is a fixed-output 3.42V, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current, and 200kHz–2.2MHz adjustable switching frequency. It operates from 4.2V to 40V input and delivers low-ripple regulation for automotive battery supplies and industrial power rails.
For engineers reviewing the LT3970EDDB-3.42#TRMPBF datasheet, LT3970EDDB-3.42#TRMPBF pinout, LT3970EDDB-3.42#TRMPBF application, or LT3970EDDB-3.42#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualification, 3.42V ±1.8% output tolerance over –40°C to 125°C, integrated diode architecture eliminating external components, and 0.7µA shutdown current enabling always-on systems.
Technical Context
The LT3970EDDB-3.42#TRMPBF implements constant-frequency current-mode control with internal slope compensation for stable operation across wide duty cycles. Its bipolar NPN switch is driven via an external BOOST capacitor to ensure full saturation at high input voltages up to 40V.
Burst Mode® operation reduces quiescent current to 1.7µA under light loads while maintaining output ripple below 5mVP-P; the open-drain PG flag asserts when VOUT reaches 90% of 3.42V, and the EN pin features 1V accurate threshold with 30mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.42V ±1.8% (3.379V–3.461V) over –40°C to 125°C - ensures stable logic supply for automotive microcontrollers. |
| Max Output Current | 350mA continuous - supports moderate-power sensors, CAN transceivers, and display bias circuits. |
| Input Voltage Range | 4.2V to 40V - accommodates 12V/24V automotive batteries including cold-crank and load-dump transients. |
| Quiescent Current | 2.5µA at 12VIN to 3.42VOUT - enables >10-year battery life in always-on telematics modules. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between EMI filtering size and efficiency in space-constrained PCBs. |
| Package | 10-lead (3mm × 2mm) DFN with exposed pad - provides 76°C/W θJA thermal resistance for compact high-density layouts. |
| Power Good Flag | Open-drain PG asserts at 90% of 3.42V (3.078V) with 12mV hysteresis - enables reliable system power sequencing and fault detection. |
Pinout & Package
LT3970EDDB-3.42#TRMPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Fixed-output voltage node | Internally regulated to 3.42V; connects directly to load and output capacitor - no external feedback divider required. |
| EN (Pin 2) | Enable control input | Hysteretic 1V rising threshold; pulls device into 0.7µA shutdown when <0.97V - supports microcontroller-controlled power gating. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; requires local 1µF–4.7µF ceramic bypass - handles up to 40V transient inputs. |
| GND (Pins 4, 5) | Analog/digital ground | Low-impedance return path for control circuitry; must be tied to exposed pad (Pin 11) for thermal and noise integrity. |
| SW (Pin 6) | Switch node | Drives external inductor; swings from GND to VIN + VBOOST - requires careful layout to minimize EMI and ringing. |
| BOOST (Pin 7) | Bootstrap drive supply | Connects to external capacitor to generate >VIN voltage for NPN switch saturation - critical for high-efficiency operation above 24V. |
| BD (Pin 8) | Boost diode anode | Provides bias current to internal regulator when >3.2V - improves efficiency by sourcing control power from regulated output. |
| PG (Pin 9) | Power good indicator | Open-drain output pulled high externally; sinks ≥30µA when active - signals valid 3.42V rail to host processor or FPGA. |
| RT (Pin 10) | Frequency set resistor | Resistor to GND programs switching frequency from 200kHz to 2.2MHz - selects inductor/capacitor size and EMI profile. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external Schottky diodes, reducing BOM count, board area, and thermal hotspots in automotive modules. |
| Low-ripple Burst Mode® operation | Maintains <5mVP-P output ripple at light loads while achieving 1.7µA IQ - preserves signal integrity in analog sensor front-ends. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to 125°C junction temperature with production test coverage - meets automotive reliability requirements without derating. |
| Internal current limiting | 350mA catch diode valley limit and 700mA switch peak limit provide robust short-circuit protection without external sensing. |
| Accurate power good flag | PG asserts at 90% of 3.42V with 12mV hysteresis - enables deterministic power sequencing in multi-rail systems. |
Applications
| Automotive Body Control Module | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering LIN transceivers, door lock actuators, and ambient light sensors in vehicle body electronics. IC Role / Device Role / Timing Role: Primary 3.42V supply regulator delivering clean, stable voltage from 12V battery rail with load dump immunity. Use Value: 40V absolute max rating and AEC-Q100 qualification ensure uninterrupted operation during 87V load dump events per ISO 7637-2. | Use Scenario: Providing regulated 3.42V to ultra-low-power microcontrollers (e.g., ARM Cortex-M0+) and environmental sensors in wireless gateways. IC Role / Device Role / Timing Role: Always-on buck converter enabling >10-year coin-cell battery life via 2.5µA quiescent current and programmable Burst Mode. Use Value: Integrated diodes and internal compensation reduce component count by 4 parts versus discrete solutions, shrinking footprint by 35%. |
| Portable Medical Diagnostic Device | Smart Building HVAC Controller |
Use Scenario: Supplying 3.42V to precision ADCs, op-amps, and Bluetooth LE radios in handheld ultrasound or glucose meters. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source ensuring <1 LSB error in 16-bit analog measurements. Use Value: <5mVP-P ripple in Burst Mode eliminates need for post-regulation LDOs, cutting power loss and bill-of-materials cost. | Use Scenario: Powering RS-485 transceivers, temperature/humidity sensors, and real-time clocks in wall-mounted thermostats. IC Role / Device Role / Timing Role: Robust 24V-to-3.42V conversion tolerant of brownouts and surges on building power lines. Use Value: Wide 4.2V–40V input range and 0.7µA shutdown current enable direct connection to 24V PoE or AC/DC adapters without pre-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3970EDDB-3.3#TRMPBF | Fixed 3.3V output (±1.8%), identical package, pinout, and specs except output voltage. | Suitable where legacy 3.3V logic compatibility is required instead of 3.42V for specific MCU I/O voltage margins. | Select only if system-level validation confirms 3.3V meets minimum VIH for connected peripherals. |
| LT3970EDDB-5#TRMPBF | Fixed 5V output (±1.2%), same thermal and electrical characteristics, but higher dropout requirement. | Used in USB peripheral interfaces, optocoupler drivers, or legacy 5V analog circuitry requiring higher headroom. | Choose when load demands exceed 3.42V compliance - not a drop-in replacement due to different output voltage. |
Compared with LT3970EDDB-3.3#TRMPBF and LT3970EDDB-5#TRMPBF, the LT3970EDDB-3.42#TRMPBF offers precise 3.42V regulation optimized for modern low-voltage microcontrollers with tighter I/O voltage tolerances, avoiding overvoltage stress on 3.3V-rated peripherals while maintaining higher efficiency than 5V variants at equivalent loads.
Availability
LT3970EDDB-3.42#TRMPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, portable medical diagnostic devices, and smart building HVAC controllers requiring stable component supply with AEC-Q100 assurance.
Supply support for LT3970EDDB-3.42#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 as a family of compact, high-voltage monolithic buck regulators targeting automotive and industrial applications where small size, low quiescent current, and integrated diodes simplify power design.
FAQ
What is the output voltage tolerance of the LT3970EDDB-3.42#TRMPBF over temperature?
The LT3970EDDB-3.42#TRMPBF guarantees a 3.42V output with ±1.8% tolerance (3.379V to 3.461V) across the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table under "LT3970-3.42 Output Voltage" with Grade E qualification.
Does the LT3970EDDB-3.42#TRMPBF require external feedback resistors?
No, the LT3970EDDB-3.42#TRMPBF does not require external feedback resistors. It is a fixed-output variant where the internal feedback divider is factory-trimmed to regulate the VOUT pin precisely to 3.42V - simplifying layout and eliminating resistor tolerance errors that affect adjustable versions.
What is the minimum input voltage required for the LT3970EDDB-3.42#TRMPBF to start and maintain regulation?
The LT3970EDDB-3.42#TRMPBF requires a minimum input voltage of 4.2V to operate, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections. Below this, the internal regulator cannot sustain bias, and the part will not initiate switching or maintain output regulation.
How does the LT3970EDDB-3.42#TRMPBF achieve low quiescent current in standby mode?
The LT3970EDDB-3.42#TRMPBF achieves 0.7µA shutdown current by disabling all internal circuitry except the EN pin comparator when the EN pin is pulled low. In active Burst Mode®, it further reduces operating current to 1.7µA by cycling the entire control loop on/off to maintain regulation with minimal average power draw.
Is the LT3970EDDB-3.42#TRMPBF pin-compatible with other LT3970 fixed-output variants?
Yes, the LT3970EDDB-3.42#TRMPBF is fully pin-compatible with LT3970EDDB-3.3#TRMPBF and LT3970EDDB-5#TRMPBF - all share identical 10-lead DFN (3mm × 2mm) packaging, pin assignment, thermal pad configuration, and electrical interface, differing only in factory-set output voltage.
LT3970EDDB-3.42#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):
- 3.42V
- 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-3.42#TRMPBF FAQ
1.How can I place an order for LT3970EDDB-3.42#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB-3.42#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 LT3970EDDB-3.42#TRMPBF reliable?
The price and inventory of LT3970EDDB-3.42#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970EDDB-3.42#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB-3.42#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB-3.42#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB-3.42#TRMPBF?
LT3970EDDB-3.42#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB-3.42#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 LT3970EDDB-3.42#TRMPBF?
For technical support, including LT3970EDDB-3.42#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB-3.42#TRMPBF requirements.
6.How does Aetrix verify that LT3970EDDB-3.42#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB-3.42#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 LT3970EDDB-3.42#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB-3.42#TRMPBF?
All LT3970EDDB-3.42#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB-3.42#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 LT3970EDDB-3.42#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB-3.42#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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