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Analog Devices Inc. LT3970IDDB-5#TRPBF
- Part No.:
- LT3970IDDB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970IDDB-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,435
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Product details
Overview
LT3970IDDB-5#TRPBF from Analog Devices is a 40V, 350mA fixed-output step-down regulator in a 10-pin (3mm × 2mm) DFN package, featuring 2.5µA quiescent current, integrated boost and catch diodes, and a power good flag. It delivers regulated 5V output for automotive battery regulation, industrial supplies, and portable power systems with low ripple Burst Mode operation.
For engineers reviewing the LT3970IDDB-5#TRPBF datasheet, LT3970IDDB-5#TRPBF pinout, LT3970IDDB-5#TRPBF application, or LT3970IDDB-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 4.2V–40V input range, 350mA load capability, AEC-Q100 qualification, and 2.5µA IQ at 12VIN-critical for always-on automotive and low-power industrial subsystems.
Technical Context
The LT3970IDDB-5#TRPBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) set via an external RT resistor. Its internal bipolar NPN switch, integrated catch and boost Schottky diodes, and internal compensation eliminate external components while enabling fast transient response and stable loop behavior across wide input voltage ranges.
Burst Mode operation reduces quiescent current to 1.7µA under light loads while maintaining output ripple below 5mVP-P. The device includes accurate enable threshold (1V), 0.7µA shutdown current, and a power good flag that asserts when VOUT reaches 90% of nominal-ensuring reliable system sequencing in automotive and industrial applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1% over –40°C to 125°C; enables direct replacement of LDOs without feedback divider. |
| Input Voltage Range | 4.2V to 40V; supports 12V/24V/36V automotive and industrial bus inputs without pre-regulation. |
| Max Output Current | 350mA continuous; limited by valley current sense on integrated catch diode, not just switch peak limit. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; sustains >1-year battery life in always-on vehicle modules. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin; higher frequencies allow smaller magnetics but reduce max VIN/VOUT ratio. |
| Power Good Threshold | Asserts when VOUT ≥ 4.5V (90% of 5V); open-drain PG pin simplifies microcontroller reset sequencing. |
| Operating Temp Range | –40°C to 125°C (I-grade); qualified per AEC-Q100 Grade 1 for under-hood automotive use. |
Pinout & Package
LT3970IDDB-5#TRPBF 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 |
|---|---|---|
| Pin 1 (FB/VOUT) | Feedback / Output Sense | For LT3970-5, this is VOUT pin-internally connected to fixed 5V divider; no external resistors required. |
| Pin 2 (EN) | Enable 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 ceramic capacitor. |
| Pins 4, 5, 11 (GND) | Ground Terminals | Three GND connections-including exposed pad-minimize ground impedance and improve thermal dissipation. |
| Pin 6 (SW) | Switch Node | Drives external inductor; connects to cathode of integrated catch diode and anode of boost diode. |
| Pin 7 (BOOST) | Bootstrap Drive | Accepts voltage > VIN to fully saturate internal NPN switch; requires external 0.22µF ceramic capacitor to SW. |
| Pin 8 (BD) | Boost Diode Anode | Connects to anode of external boost diode; also powers internal bias regulator when BD > 3.2V, improving efficiency. |
| Pin 9 (PG) | Power Good Flag | Open-drain output; pulled high externally; valid only when EN = high and VIN ≥ 4.2V. |
| Pin 10 (RT) | Frequency Set | Resistor-to-ground sets switching frequency; e.g., 226kΩ yields ~600kHz (see Table 1 in datasheet). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost & Catch Diodes | Eliminates 2 external Schottky diodes-reducing BOM count, footprint, and thermal stress in compact designs. |
| Low Ripple Burst Mode® | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA, critical for noise-sensitive analog circuits. |
| AEC-Q100 Qualified (Grade 1) | Validated for automotive applications including body control modules, infotainment power rails, and ADAS sensors. |
| Internal Compensation | Removes need for external compensation network-simplifying design, reducing layout sensitivity, and accelerating time-to-market. |
| Catch Diode Current Limit | Valley-current sensing protects against short-circuit faults without external current-sense resistors or ICs. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V for microcontrollers and CAN transceivers in body control units. IC Role / Device Role / Timing Role: Primary DC/DC converter providing always-on 5V rail with ultra-low IQ to meet OEM sleep current budgets. Use Value: 2.5µA quiescent current extends battery life during extended parking; AEC-Q100 qualification ensures reliability under temperature cycling and vibration. | Use Scenario: Powering 4–20mA loop-powered sensors and isolated ADCs in factory automation PLCs. IC Role / Device Role / Timing Role: Compact, high-input-voltage buck regulator delivering precise 5V from unregulated 18–36V industrial supplies. Use Value: 40V absolute max rating tolerates 36V transients; integrated diodes reduce component count and improve MTBF in harsh EMI environments. |
| Portable Medical Device Supply | Smart Building Controller Rail |
Use Scenario: Generating 5V from dual-cell Li-ion (6–8.4V) or 9V alkaline for handheld diagnostic tools with long shelf life. IC Role / Device Role / Timing Role: Efficient, low-noise power stage enabling clean analog front-end operation and extended battery runtime. Use Value: Burst Mode maintains <5mVP-P ripple at µA loads-preventing interference with sensitive biosignal acquisition circuits. | Use Scenario: Providing regulated 5V for Wi-Fi/BLE SoCs, real-time clocks, and non-volatile memory in HVAC controllers and lighting nodes. IC Role / Device Role / Timing Role: Always-on auxiliary supply supporting firmware updates, secure boot, and low-power wake-on-LAN functionality. Use Value: 0.7µA shutdown current and accurate 1V EN threshold enable deterministic deep-sleep entry/exit-reducing annual energy consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520RNXR | 65V input, 2A output, 26µA IQ; uses MOSFET switch and external diode; no PG flag. | Better for high-voltage industrial inputs (>40V); unsuitable where 5mV ripple or PG sequencing is required. | Select if input exceeds 40V or >350mA load needed; avoid if AEC-Q100 or ultra-low IQ is mandatory. |
| TPS6286518VRQYR | 18V input, 6A output, 1.5µA IQ; synchronous buck, 2.25MHz fixed frequency; no integrated diodes. | Optimized for space-constrained consumer electronics; lacks automotive qualification and high-VIN capability. | Choose for high-efficiency, high-current portable apps; not viable for 24V automotive or 36V industrial use cases. |
Compared with LMR36520RNXR and TPS6286518VRQYR, the LT3970IDDB-5#TRPBF uniquely balances AEC-Q100 compliance, 40V input tolerance, 5V fixed output, and sub-3µA IQ-making it the only drop-in solution for cost-sensitive, thermally constrained automotive and industrial 5V rails requiring guaranteed low-noise operation.
Availability
LT3970IDDB-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power, and portable medical device supply requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3970IDDB-5#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 is designed for high-reliability, wide-input-voltage DC/DC conversion in automotive and industrial environments-emphasizing ultra-low quiescent current, integrated power devices, and robust fault protection.
FAQ
What is the output voltage tolerance of the LT3970IDDB-5#TRPBF over temperature?
The LT3970IDDB-5#TRPBF delivers 5V output with ±1% tolerance over the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table (4.94V to 5.06V at –40°C to 125°C). This tight regulation is achieved via laser-trimmed internal feedback resistors and is validated per AEC-Q100 test conditions.
Does the LT3970IDDB-5#TRPBF require external diodes?
No, the LT3970IDDB-5#TRPBF integrates both the boost diode and catch diode on-die. This eliminates the need for two external Schottky diodes, reducing board area, component count, and thermal design complexity. External diodes are not recommended or required for standard operation.
What is the minimum input voltage required for the LT3970IDDB-5#TRPBF to regulate 5V output?
The LT3970IDDB-5#TRPBF requires a minimum input voltage of 4.2V to operate and regulate 5V output. Below this, the internal circuitry cannot sustain regulation. At higher switching frequencies, the practical minimum may increase slightly due to duty cycle limitations, but 4.2V remains the absolute lower bound per Absolute Maximum Ratings.
How does the power good (PG) flag behave on the LT3970IDDB-5#TRPBF?
The PG pin on the LT3970IDDB-5#TRPBF is an open-drain output that remains low until VOUT reaches 90% of nominal (i.e., ≥4.5V). It becomes high-impedance (allowing external pull-up) once regulation is achieved. PG is only valid when EN is high and VIN ≥ 4.2V, ensuring reliable system power sequencing in automotive and industrial applications.
Is the LT3970IDDB-5#TRPBF pin-compatible with other variants in the LT3970 family?
Yes, the LT3970IDDB-5#TRPBF shares identical pinout and package (10-lead DFN) with all other LT3970 DFN variants (e.g., LT3970IDDB-3.3#TRPBF, LT3970EDDB#TRPBF). Pin functions-including FB/VOUT, EN, VIN, GND, SW, BOOST, BD, PG, and RT-are electrically and physically identical across the family, enabling flexible BOM management and design reuse.
LT3970IDDB-5#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):
- 5V
- 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-5#TRPBF FAQ
1.How can I place an order for LT3970IDDB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970IDDB-5#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 LT3970IDDB-5#TRPBF reliable?
The price and inventory of LT3970IDDB-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970IDDB-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970IDDB-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970IDDB-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970IDDB-5#TRPBF?
LT3970IDDB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970IDDB-5#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 LT3970IDDB-5#TRPBF?
For technical support, including LT3970IDDB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970IDDB-5#TRPBF requirements.
6.How does Aetrix verify that LT3970IDDB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970IDDB-5#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 LT3970IDDB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970IDDB-5#TRPBF?
All LT3970IDDB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970IDDB-5#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 LT3970IDDB-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3970IDDB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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