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Analog Devices Inc. LT3970IDDB#TRMPBF
- Part No.:
- LT3970IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970IDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:673
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Product details
Overview
LT3970IDDB#TRMPBF from Analog Devices is a 40V, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current, adjustable switching frequency (200kHz–2.2MHz), and power good flag - designed for automotive battery regulation and industrial supplies where low-noise, high-efficiency light-load operation is critical.
For engineers reviewing the LT3970IDDB#TRMPBF datasheet, LT3970IDDB#TRMPBF pinout, LT3970IDDB#TRMPBF application, or LT3970IDDB#TRMPBF equivalent, key selection factors include its 3mm × 2mm DFN package, -40°C to 125°C operating junction temperature, integrated diode architecture, Burst Mode® ripple control (<5mVP-P), and accurate 1V enable threshold with 0.7µA shutdown current.
Technical Context
The LT3970IDDB#TRMPBF employs constant-frequency current-mode control with internal slope compensation for fast transient response and loop stability. Its bipolar NPN switch is driven via an external BOOST capacitor to ensure full saturation, enabling efficient operation across wide input ranges up to 40V.
Burst Mode® operation reduces quiescent current to 1.7µA at light loads while maintaining output ripple below 5mVP-P; the power good flag asserts when FB reaches 90% of regulation voltage, and catch diode current limiting protects against shorted outputs and overvoltage faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 40V - supports direct connection to 12V/24V/36V automotive and industrial rails without pre-regulation. |
| Output Current | 350mA - limited by valley current sense on integrated catch diode; sufficient for powering microcontrollers, sensors, and interface ICs. |
| Quiescent Current | 2.5µA at 12VIN → 3.3VOUT - enables multi-year battery life in always-on monitoring systems. |
| Switching Frequency | 200kHz to 2.2MHz - set externally via RT resistor; higher frequencies allow smaller magnetics but reduce max duty cycle. |
| Feedback Reference | 1.21V ±1.2% - used with external resistor divider to program output from 1.21V to 25V; enables precise regulation under load and line variation. |
| Power Good Threshold | 90% of regulated output - open-drain PG pin signals valid regulation; requires VIN > 4.2V and EN high to activate. |
| Enable Threshold | 1.0V rising edge (±60mV hysteresis) - accurate enable logic allows clean system-level power sequencing. |
Pinout & Package
LT3970IDDB#TRMPBF is housed in 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 |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulated to 1.21V; connects to resistor divider tap for adjustable output voltage configuration. |
| EN (Pin 2) | Enable control | Hysteretic input with 1.0V rising threshold; pulls device into 0.7µA shutdown when low. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; must be locally bypassed with ≥1µF ceramic capacitor. |
| GND (Pins 4, 5, 11) | Ground reference | Multiple ground connections including exposed pad; all must be low-impedance to PCB ground plane. |
| SW (Pin 6) | Switch node | Connects to inductor; carries high dI/dt switching current; layout critical for EMI and efficiency. |
| BOOST (Pin 7) | Bootstrap drive | Drives internal NPN switch via external capacitor; must exceed SW by ≥1.4V to guarantee saturation. |
| 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; pulled high externally; asserts when FB reaches 90% of target regulation. |
| RT (Pin 10) | Frequency set | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz per manufacturer table. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated diodes | On-die boost and catch Schottky diodes eliminate 2 external components and reduce board area and BOM cost. |
| Low ripple Burst Mode® | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA, avoiding audible ceramic capacitor noise. |
| AEC-Q100 qualified | Rated for automotive applications (Grade I: –40°C to 125°C junction), supporting functional safety-critical subsystems. |
| Internal compensation | Eliminates need for external compensation network, simplifying design and improving production consistency. |
| Catch diode current limit | Valley-current sensing limits output to ≤400mA under fault conditions, preventing thermal runaway during short circuits. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power |
|---|---|
Use Scenario: Regulating 12V–36V vehicle battery rail to stable 3.3V/5V for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise, AEC-Q100-compliant power with power good signaling for safe boot sequencing. Use Value: 2.5µA quiescent current extends battery life during ignition-off states; integrated diodes reduce component count and improve reliability in vibration-prone environments. | Use Scenario: Powering 4–20mA loop-powered sensors and analog front-ends in factory automation PLCs. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator delivering precise 3.3V/5V from unregulated 24V industrial supply with robust fault protection. Use Value: 40V absolute max input withstands load dump transients; catch diode current limit prevents damage during sensor wiring faults. |
| Portable Medical Monitoring | Rail-to-Rail Industrial Supplies |
Use Scenario: Enabling multi-year operation of wearable ECG monitors powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator converting 3.6V–4.2V battery to 3.3V for ultra-low-power microcontroller and BLE radio. Use Value: 1.7µA Burst Mode current minimizes standby drain; small 3mm × 2mm DFN footprint fits tight wearable form factors. | Use Scenario: Generating 5V/3.3V from wide-range 9V–36V DIN-rail supplies in industrial gateways and edge controllers. IC Role / Device Role / Timing Role: Primary DC/DC stage accepting variable input and delivering tightly regulated output with thermal derating support up to 125°C. Use Value: Internal thermal shutdown and current limiting ensure continuous operation in enclosed enclosures; MSOP/DFN options support both compact and thermally demanding layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8#TRPBF | 42V input, 2.5A output, 2.5µA IQ, synchronous rectification, 3mm × 4mm SO-8 package | Higher output current and synchronous architecture suit higher-power applications; larger package increases board area | Select when >350mA load or synchronous efficiency is required; not pin-compatible |
| TPS62130ARGTR | 6V input max, 3A output, 17µA IQ, 2mm × 2mm WSON, no integrated catch diode | Limited to low-voltage systems; requires external catch diode and higher IQ compromises battery life | Choose only for space-constrained 3.3V/5V systems with VIN < 6V; incompatible with 12V+ inputs |
Compared with LT8609SIS8#TRPBF, LT3970IDDB#TRMPBF offers lower solution size and better light-load efficiency but less output current; versus TPS62130ARGTR, it supports automotive-grade input range and integrated diodes but occupies more PCB area than the 2mm × 2mm WSON.
Availability
LT3970IDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power, and portable medical monitoring requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3970IDDB#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 precision instrumentation, industrial automation, and automotive markets.
The LT3970 series was developed for high-reliability, wide-input-voltage DC/DC conversion in harsh environments - emphasizing ultra-low quiescent current, integrated power devices, and AEC-Q100 qualification for automotive and industrial use.
FAQ
What is the operating temperature range for LT3970IDDB#TRMPBF?
The LT3970IDDB#TRMPBF is rated for an operating junction temperature range of –40°C to 125°C, meeting Grade I specifications per AEC-Q100. This makes LT3970IDDB#TRMPBF suitable for under-hood automotive modules and industrial equipment operating in thermally demanding environments without derating.
Does LT3970IDDB#TRMPBF require external diodes?
No, LT3970IDDB#TRMPBF integrates both the boost diode and catch Schottky diode on-die. This eliminates two external components, reduces PCB footprint, improves reliability, and simplifies layout - unlike many buck regulators that require discrete diodes for bootstrap and freewheeling functions.
How does LT3970IDDB#TRMPBF achieve low output ripple in Burst Mode?
LT3970IDDB#TRMPBF maintains output ripple below 5mVP-P in Burst Mode through optimized control loop dynamics and valley-current limiting, combined with internal compensation. The device avoids audio-frequency excitation of ceramic capacitors by managing burst timing and energy per cycle - a key differentiator from generic low-IQ buck converters.
Can LT3970IDDB#TRMPBF be used with fixed-output variants like LT3970IDDB-5#TRMPBF?
No - LT3970IDDB#TRMPBF is the adjustable version with FB pin; fixed-output variants (e.g., LT3970IDDB-5#TRMPBF) use VOUT pin and internal resistor dividers. They share the same DFN package and temperature grade but differ in feedback architecture, pin function (Pin 1 = FB vs. VOUT), and output programming method.
What is the minimum input voltage required for LT3970IDDB#TRMPBF to regulate a 5V output?
For a 5V output, LT3970IDDB#TRMPBF requires a minimum input voltage of approximately 5.7V at typical switching frequencies, based on duty cycle limits and diode/switch drops. The absolute minimum specified operating input is 4.2V, but practical regulation at 5V output begins above ~5.5V depending on frequency and load.
LT3970IDDB#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 25V
- 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#TRMPBF FAQ
1.How can I place an order for LT3970IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970IDDB#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#TRMPBF reliable?
The price and inventory of LT3970IDDB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970IDDB#TRMPBF?
LT3970IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970IDDB#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#TRMPBF?
For technical support, including LT3970IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970IDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3970IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970IDDB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970IDDB#TRMPBF?
All LT3970IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970IDDB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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