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Analog Devices Inc. LT3970EDDB-3.42#TRPBF
- Part No.:
- LT3970EDDB-3.42#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB-3.42#TRPBF.pdf
- Description:
- IC REG BUCK 3.42V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,310
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Product details
Overview
LT3970EDDB-3.42#TRPBF from Analog Devices is a 40V input, 350mA fixed-output buck regulator in a 3mm × 2mm DFN package, featuring 2.5µA quiescent current, integrated boost and catch diodes, and a precise 3.42V output voltage. It operates from 4.2V to 40V input, supports adjustable switching frequency (200kHz–2.2MHz), and delivers low-ripple Burst Mode operation for battery-powered automotive and industrial supplies.
For engineers reviewing the LT3970EDDB-3.42#TRPBF datasheet, LT3970EDDB-3.42#TRPBF pinout, LT3970EDDB-3.42#TRPBF application, or LT3970EDDB-3.42#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 3.42V ±1.2% output accuracy over –40°C to 125°C, integrated diode architecture eliminating external components, and power good flag with 90% VOUT threshold.
Technical Context
The LT3970EDDB-3.42#TRPBF implements a constant-frequency current-mode control architecture with internal compensation, enabling fast transient response and stable loop behavior without external compensation networks. Its monolithic design 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 ripple below 5mVP-P; the catch diode valley current limit (350mA typical) and switch peak current limit (535mA min) jointly constrain maximum deliverable output current under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.42V ±1.2% over –40°C to 125°C; eliminates need for external feedback resistors. |
| Input Voltage Range | 4.2V to 40V continuous operation; supports wide automotive battery and industrial supply rails. |
| Max Output Current | 350mA continuous; limited by integrated catch diode valley current rating, not just switch capability. |
| Quiescent Current | 2.5µA at 12VIN → 3.42VOUT; enables multi-year battery life in always-on sensor nodes. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT resistor; allows optimization of inductor size vs. efficiency trade-off. |
| Power Good Flag | Open-drain PG asserts when VOUT reaches 90% of 3.42V (3.078V); provides system-level power sequencing signal. |
| Enable Threshold | 1.0V rising-edge threshold with 30mV hysteresis; ensures clean startup and shutdown control. |
Pinout & Package
LT3970EDDB-3.42#TRPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground. Pin numbering follows top-view layout with Pin 1 at bottom-left corner.
| 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 required. |
| EN (Pin 2) | Enable control input | Hysteretic digital input (1.0V rise/0.97V fall); pulls low for shutdown (0.7µA IQ). |
| 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; must connect to exposed pad. |
| SW (Pin 6) | Switch node | Connects to inductor; carries high di/dt switching current; critical for EMI layout. |
| BOOST (Pin 7) | Bootstrap drive voltage | Drives internal NPN switch base above VIN via external capacitor; must exceed SW by ≤30V. |
| 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 open-drain | Sinks current when VOUT < 3.078V; requires external pull-up for logic-level signaling. |
| RT (Pin 10) | Frequency setting | Resistor-to-ground sets switching frequency; 226kΩ yields ~600kHz per datasheet table. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external diodes, reducing BOM count, board area, and forward drop losses. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while achieving 1.7µA IQ, critical for noise-sensitive analog circuits. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to 125°C junction temperature; validated for automotive battery regulation and infotainment systems. |
| Internal sense limits catch diode current | Valley-current foldback protects against short-circuit faults without external current-sense resistors. |
| Accurate 1V enable threshold | Enables direct interface with microcontroller GPIOs without level-shifting; 30mV hysteresis prevents chatter. |
Applications
| Automotive Battery Regulation | Industrial Sensor Node Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.42V for CAN transceiver bias and microcontroller I/O. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 3.42V with high input voltage tolerance and low quiescent current. Use Value: Enables always-on vehicle modules with <2.5µA standby draw, meeting ISO 16750-2 cold-cranking requirements. | Use Scenario: Powering ultra-low-power wireless sensor nodes (e.g., LoRaWAN, NB-IoT) deployed in remote industrial sites. IC Role / Device Role / Timing Role: Fixed-output buck regulator supplying 3.42V to RF SoC and precision ADC, operating from primary lithium thionyl chloride cells. Use Value: Extends battery life beyond 10 years via 1.7µA Burst Mode IQ and integrated diodes reducing component count and leakage paths. |
| Portable Medical Device Supply | Factory Automation I/O Module |
Use Scenario: Providing clean 3.42V rail for analog front-end and low-noise op-amps in handheld diagnostic equipment. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with integrated filtering and PG flag for system health monitoring. Use Value: Achieves <5mVP-P output ripple without external LC filters, preserving signal integrity in µV-level biomedical measurements. | Use Scenario: Generating 3.42V for isolated digital I/O drivers and status LEDs in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Robust, thermally efficient DC-DC stage supporting wide-input industrial power supplies (18–36V DC). Use Value: Delivers 350mA continuously at 40VIN with θJA = 76°C/W, enabling compact convection-cooled designs without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3970EDDB-3.3#TRPBF | Fixed 3.3V output (±1.2%), identical package, pinout, and specs otherwise. | Used where 3.3V logic compatibility is required instead of 3.42V analog reference or bias voltage. | Select when system requires standard 3.3V rail; verify downstream device VIH margins support 3.3V vs. 3.42V. |
| LT3970EDDB-5#TRPBF | Fixed 5V output (±1.2%), same DFN package and pinout; higher output voltage increases dropout sensitivity. | Applicable for USB-peripheral power, 5V logic interfaces, or legacy analog circuitry requiring 5V. | Choose for 5V systems; note minimum input voltage rises to ~5.5V due to higher VOUT/diode drop ratio. |
Compared with LT3970EDDB-3.3#TRPBF and LT3970EDDB-5#TRPBF, the LT3970EDDB-3.42#TRPBF provides a non-standard but precisely optimized voltage for analog biasing-such as powering 3.3V-referenced DACs with headroom for internal LDOs-without requiring external resistor dividers or compromising on quiescent current or integration.
Availability
LT3970EDDB-3.42#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor node power, portable medical device supply, and factory automation I/O module applications requiring stable component supply across extended temperature ranges.
Supply support for LT3970EDDB-3.42#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 as a highly integrated, low-quiescent-current buck regulator family targeting space-constrained, battery-sensitive applications where reliability across extreme temperatures and minimal external components are critical.
FAQ
What is the output voltage tolerance of the LT3970EDDB-3.42#TRPBF over temperature?
The LT3970EDDB-3.42#TRPBF guarantees a 3.42V output with ±1.2% tolerance over the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table (page 4). This corresponds to 3.379V minimum and 3.461V maximum at 125°C, ensuring stable biasing for precision analog circuits without external trimming.
Does the LT3970EDDB-3.42#TRPBF require external diodes?
No, the LT3970EDDB-3.42#TRPBF integrates both the boost diode and catch Schottky diode on-die. This eliminates two external components, reduces board area, and removes associated forward voltage drops and reverse leakage paths-directly contributing to its 2.5µA quiescent current and simplified layout.
How does the power good (PG) flag behave on the LT3970EDDB-3.42#TRPBF?
The PG pin on the LT3970EDDB-3.42#TRPBF is an open-drain output that remains low until VOUT reaches 90% of its nominal 3.42V value (i.e., 3.078V). It asserts high only when enabled and VIN > 4.2V, providing a reliable system-level power-sequencing signal compatible with microcontrollers and FPGAs.
What is the minimum input voltage required for the LT3970EDDB-3.42#TRPBF to regulate at full load?
The LT3970EDDB-3.42#TRPBF requires a minimum input voltage of 4.2V to operate, but full 350mA output current at 3.42V demands higher VIN depending on switching frequency. At 600kHz (RT = 226kΩ), the practical minimum is ~5.8V due to duty cycle limitations and diode/switch voltage drops, as derived from the datasheet's VIN(MIN) equation on page 12.
Is the LT3970EDDB-3.42#TRPBF suitable for automotive applications?
Yes, the LT3970EDDB-3.42#TRPBF is AEC-Q100 qualified (Grade E) for automotive use, rated from –40°C to 125°C junction temperature, and designed for battery regulation in infotainment, ADAS, and body electronics. Its 40V absolute maximum input rating and robust fault protection make it suitable for harsh automotive environments.
LT3970EDDB-3.42#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):
- 3.42V
- 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#TRPBF FAQ
1.How can I place an order for LT3970EDDB-3.42#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB-3.42#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-3.42#TRPBF reliable?
The price and inventory of LT3970EDDB-3.42#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-3.42#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB-3.42#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB-3.42#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB-3.42#TRPBF?
LT3970EDDB-3.42#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB-3.42#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-3.42#TRPBF?
For technical support, including LT3970EDDB-3.42#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB-3.42#TRPBF requirements.
6.How does Aetrix verify that LT3970EDDB-3.42#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB-3.42#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-3.42#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB-3.42#TRPBF?
All LT3970EDDB-3.42#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB-3.42#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-3.42#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB-3.42#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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