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Analog Devices Inc. LT3970EDDB-5#TRMPBF
- Part No.:
- LT3970EDDB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB-5#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,899
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Product details
Overview
LT3970EDDB-5#TRMPBF from Analog Devices is a 40V input, 5V fixed-output monolithic buck switching regulator in a 10-pin (3mm × 2mm) DFN package, delivering up to 350mA output current with 2.5µA quiescent current and integrated boost/catch diodes. It operates from 4.2V to 40V input, supports adjustable frequency from 200kHz to 2.2MHz via RT pin, and includes power good flag and accurate 1V enable threshold - ideal for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3970EDDB-5#TRMPBF datasheet, LT3970EDDB-5#TRMPBF pinout, LT3970EDDB-5#TRMPBF application, or LT3970EDDB-5#TRMPBF equivalent, key selection criteria include its 5V fixed output accuracy (±1.2% over –40°C to 125°C), low-noise Burst Mode operation (<5mVP-P ripple), AEC-Q100 qualification, and thermal performance with θJA = 76°C/W in DFN packaging.
Technical Context
The LT3970EDDB-5#TRMPBF implements constant-frequency current-mode control with internal compensation, enabling fast transient response and stable loop behavior without external compensation components. Its architecture integrates a bipolar NPN power switch, catch diode, boost diode, oscillator, and error amplifier on-die.
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 VOUT reaches 90% of nominal 5V, and the catch diode current limit (350mA typical) provides short-circuit protection independent of switch current limit (535mA min).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% over –40°C to 125°C - eliminates external feedback resistors and ensures stable rail for microcontrollers or sensors. |
| Input Voltage Range | 4.2V to 40V - supports wide automotive battery transients (cold crank, load dump) and industrial 24V/36V systems. |
| Max Output Current | 350mA - sufficient for powering small MCUs, RF modules, or sensor interfaces without external pass devices. |
| Quiescent Current | 2.5µA at 12VIN to 5VOUT - enables multi-year battery life in always-on IoT or telematics applications. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 22µH at 600kHz) and efficiency/noise. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Thermal Resistance | θJA = 76°C/W (DFN package) - supports 350mA continuous output at ambient ≤85°C with minimal PCB copper. |
Pinout & Package
LT3970EDDB-5#TRMPBF uses a 10-pin (3mm × 2mm) plastic DFN package with exposed pad (Pin 11) soldered to GND for thermal and electrical integrity. Pin 1 is FB/VOUT (tied internally to fixed 5V divider), Pin 2 is EN, Pin 3 is VIN, Pins 4 & 5 are GND, Pin 6 is SW, Pin 7 is BOOST, Pin 8 is BD, Pin 9 is PG, Pin 10 is RT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB/VOUT) | Fixed-output feedback node | Internally connected to 5V regulation divider - no external resistors required; voltage accuracy ±1.2% over temperature. |
| Pin 2 (EN) | Enable control input | Hysteretic 1V rising threshold (±30mV) - enables precise system-level power sequencing; draws only 0.7µA in shutdown. |
| Pin 3 (VIN) | Main power input | Supplies internal circuitry and switch - must be bypassed locally with ≥1µF X7R ceramic capacitor near the pin. |
| Pins 4, 5, 11 (GND) | Power and signal ground | Exposes thermal pad (Pin 11) - requires solid solder connection to PCB GND plane for thermal dissipation and noise immunity. |
| Pin 6 (SW) | Switch node | Drives external inductor - high dv/dt node requiring tight layout; connects directly to inductor's SW-side terminal. |
| Pin 7 (BOOST) | Bootstrap drive voltage | Requires external capacitor to generate >VIN voltage - enables full saturation of internal bipolar NPN switch for low VCE(SAT). |
| Pin 8 (BD) | Boost diode anode / bias source | Accepts external bias ≥3.2V (e.g., from VOUT) to improve efficiency by powering internal regulator from output instead of VIN. |
| Pin 9 (PG) | Open-drain power good flag | Asserts high when VOUT ≥4.5V (90% of 5V); valid only when EN = high and VIN ≥4.2V - used for system reset or supervisor signaling. |
| Pin 10 (RT) | Frequency programming | Resistor-to-GND sets switching frequency (200kHz–2.2MHz); e.g., 226kΩ yields 600kHz - balances inductor size, efficiency, and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external diodes - reduces BOM count, PCB area, and thermal stress; enables compact 5V supply design. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA - avoids audible ceramic capacitor noise and preserves battery life. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature - validated for automotive infotainment, ADAS sensors, and body electronics. |
| Internal current limiting (catch diode) | 350mA valley current limit - protects against sustained short-circuit conditions without external sense resistors or shutdown delay. |
| Accurate power good flag | 120mV hysteresis around 90% VOUT threshold - provides reliable system power-up sequencing and fault detection without external comparators. |
Applications
| Automotive Battery Regulation | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering CAN transceivers and microcontrollers from 12V vehicle battery with cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator providing stable, low-noise supply with AEC-Q100 reliability and transient robustness. Use Value: Eliminates need for external TVS and pre-regulator stages; maintains regulation across full automotive voltage range without derating. |
Use Scenario: Long-life wearable ECG or pulse oximeter powered by coin cell or small Li-ion battery. IC Role / Device Role / Timing Role: Ultra-low-IQ 5V supply enabling multi-year operation in sleep mode with fast wake-up response. Use Value: 2.5µA quiescent current extends battery life; Burst Mode ensures <5mV ripple during signal acquisition without LDO overhead. |
| Industrial 24V Field Instrumentation | Smart Building Controllers |
|
Use Scenario: Powering RS-485 transceivers, ADCs, and wireless SoCs in DIN-rail mounted sensors operating from 24V DC bus. IC Role / Device Role / Timing Role: Compact, thermally efficient 5V converter handling 40V surges and ambient temperatures up to 85°C. Use Value: DFN package with θJA = 76°C/W sustains 350mA output without heatsink; integrated diodes reduce thermal hotspots. |
Use Scenario: HVAC controllers and lighting nodes requiring reliable 5V rail from PoE or 12–24V building wiring. IC Role / Device Role / Timing Role: Fixed-output buck regulator with PG flag for safe boot sequencing and brown-out detection. Use Value: Power good signal synchronizes firmware initialization; 1V EN threshold enables clean system-level enable/disable control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610ACIMSE#TRPBF | 42V input, 5V fixed, 3.5A output, 2.5µA IQ, Silent Switcher® architecture | Higher current capability and lower EMI; larger 16-pin MSE package (3mm × 4mm) | Select when >350mA load or strict EMI limits apply; not pin-compatible - requires PCB redesign. |
| TPS54331DR | 28V input, adjustable output (0.8–28V), 3A output, 4.5µA IQ, external diode | Wider output adjustability but no integrated diodes; requires external catch diode and compensation network | Select for non-5V outputs or higher current; adds BOM cost and layout complexity versus LT3970EDDB-5#TRMPBF's integrated solution. |
Compared with LT8610ACIMSE#TRPBF and TPS54331DR, the LT3970EDDB-5#TRMPBF offers optimal balance of ultra-low IQ, fixed 5V simplicity, integrated diodes, and AEC-Q100 qualification in the smallest footprint - making it ideal for space-constrained, battery-sensitive, or automotive-grade 350mA applications where 5V is required.
Availability
LT3970EDDB-5#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical sensors, and industrial field instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for LT3970EDDB-5#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 high-input-voltage, low-quiescent-current DC/DC conversion in automotive and portable applications - emphasizing integration, reliability, and ease of use in harsh environments.
FAQ
What is the output voltage tolerance of the LT3970EDDB-5#TRMPBF over temperature?
The LT3970EDDB-5#TRMPBF delivers a fixed 5.0V output with ±1.2% tolerance over the full –40°C to +125°C junction temperature range, as specified in the Electrical Characteristics table. This accuracy is achieved via laser-trimmed internal feedback resistors and is confirmed across production lots - no external calibration is needed for 5V rail compliance in automotive or industrial designs using the LT3970EDDB-5#TRMPBF.
Does the LT3970EDDB-5#TRMPBF require external diodes?
No, the LT3970EDDB-5#TRMPBF integrates both the boost diode and catch diode on-die, eliminating the need for two external diodes. This integration reduces bill-of-materials cost, PCB area, and thermal management complexity. The device's datasheet explicitly confirms "Integrated Boost and Catch Diodes" as a core feature, and all typical application circuits for the LT3970EDDB-5#TRMPBF show zero external diodes - confirming full functionality with only VIN, SW, BOOST, BD, and output capacitors required.
How does the power good (PG) flag behave on the LT3970EDDB-5#TRMPBF?
The PG pin on the LT3970EDDB-5#TRMPBF is an open-drain output that remains low until VOUT reaches 90% of 5.0V (i.e., 4.5V), then pulls high via external pull-up. It is valid only when EN is high and VIN ≥4.2V. The PG threshold has 120mV hysteresis to prevent chatter during marginal conditions. This behavior is fully documented in the Electrical Characteristics table and Typical Performance Characteristics (Figure G25), ensuring predictable system power sequencing for designs using the LT3970EDDB-5#TRMPBF.
Can the LT3970EDDB-5#TRMPBF operate from a 5V input to generate 5V output?
No - the LT3970EDDB-5#TRMPBF requires a minimum input voltage of 4.2V to operate, but cannot sustain regulation at VIN = VOUT due to dropout limitations. Its minimum dropout is determined by switch VCE(SAT) (~175mV) and catch diode forward drop (~650mV), requiring VIN ≥ ~5.8V for reliable 5V output under load. At VIN = 5V, the device may start but will drop out under any significant load; the datasheet specifies "Minimum Input Voltage" as 4.2V only for no-load or very light-load conditions. For 5V-in/5V-out, a low-dropout linear regulator or different topology is required instead of the LT3970EDDB-5#TRMPBF.
Is the LT3970EDDB-5#TRMPBF pin-compatible with other LT3970 variants?
Yes - all LT3970 variants (including LT3970EDDB-3.3#TRMPBF, LT3970EDDB-3.42#TRMPBF, and LT3970EDDB-5#TRMPBF) share identical 10-pin DFN packaging, pinout, and thermal pad configuration. The only functional difference is the internal feedback divider: Pin 1 (FB/VOUT) is hardwired to deliver 3.3V, 3.42V, or 5.0V respectively. This allows direct substitution in existing layouts when changing output voltage requirements, provided the new variant's output tolerance and load capability meet system needs - a key advantage confirmed in the Order Information table of the LT3970 datasheet for the LT3970EDDB-5#TRMPBF.
LT3970EDDB-5#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):
- 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)
LT3970EDDB-5#TRMPBF FAQ
1.How can I place an order for LT3970EDDB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB-5#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-5#TRMPBF reliable?
The price and inventory of LT3970EDDB-5#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-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB-5#TRMPBF?
LT3970EDDB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB-5#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-5#TRMPBF?
For technical support, including LT3970EDDB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB-5#TRMPBF requirements.
6.How does Aetrix verify that LT3970EDDB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB-5#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-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB-5#TRMPBF?
All LT3970EDDB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB-5#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-5#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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