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Analog Devices Inc. LT3970IDDB-5#TRMPBF
- Part No.:
- LT3970IDDB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970IDDB-5#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:522
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Product details
Overview
LT3970IDDB-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, and features power good flag and accurate 1V enable threshold - used in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3970IDDB-5#TRMPBF datasheet, LT3970IDDB-5#TRMPBF pinout, LT3970IDDB-5#TRMPBF application, or LT3970IDDB-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 LT3970IDDB-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 regulation and limiting ripple to <5mVP-P; the power good flag asserts when VOUT reaches 90% of nominal 5V, and the catch diode current limit protects against shorted outputs with a valley limit of 350mA.
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-range automotive batteries (cold-crank to load-dump) and industrial 24V/36V systems. |
| Max Output Current | 350mA - defined by catch diode valley current limit, sufficient for powering small MCU subsystems or interface ICs. |
| Quiescent Current | 2.5µA at 12VIN to 5VOUT - enables always-on functionality in battery-backed applications with multi-year standby life. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin - allows optimization of inductor size (e.g., 22µH at 600kHz) and EMI profile. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Enable Threshold | 1.0V ±30mV rising edge - provides precise system-level power sequencing control with hysteresis for noise immunity. |
Pinout & Package
LT3970IDDB-5#TRMPBF is housed in a thermally enhanced 10-lead (3mm × 2mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB for thermal management (θJA = 76°C/W). Pin 1 is FB/VOUT - configured as VOUT for fixed-5V variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB/VOUT) | Fixed output voltage sense node | Internally connected to precision divider; regulates output to 5.0V - no external resistor required. |
| Pin 2 (EN) | Enable control input | Hysteretic 1.0V threshold enables clean startup/shutdown; draws only 0.7µA in shutdown. |
| Pin 3 (VIN) | Main power input | Supplies internal circuitry and switch; rated to 40V absolute max - accepts automotive transients. |
| Pins 4, 5, 11 (GND) | Power and signal ground | Multiple GND pins and exposed pad minimize impedance and improve thermal dissipation. |
| Pin 6 (SW) | Switch node | Drives external inductor; connects to internal bipolar NPN switch - requires careful layout to minimize EMI. |
| Pin 7 (BOOST) | Bootstrap drive voltage | Generates >VIN voltage to fully saturate internal switch; requires external 0.22µF ceramic capacitor. |
| Pin 8 (BD) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V - improves efficiency. |
| Pin 9 (PG) | Power good open-drain flag | Signals 5V regulation status (90% threshold); sinks 80µA - enables system reset or monitoring logic. |
| Pin 10 (RT) | Frequency setting input | Resistor-to-ground sets switching frequency; 226kΩ yields 600kHz per datasheet Table 1. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external diodes - reduces BOM count, PCB area, and forward-drop losses in compact designs. |
| Low ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while achieving 1.7µA IQ - critical for battery-powered IoT nodes. |
| AEC-Q100 qualified (Grade I) | Rated for –40°C to +125°C junction temperature - validated for automotive under-hood and infotainment power rails. |
| Internal compensation | Removes need for external compensation network - simplifies design, improves reliability, and reduces layout sensitivity. |
| Catch diode current limit | 350mA valley limit protects against sustained short-circuit conditions without external current-sense components. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery to stable 5V for CAN transceivers and microcontrollers during cold-crank (5.5V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary step-down regulator with integrated protection, providing regulated 5V rail independent of battery fluctuations. Use Value: AEC-Q100 qualification and 40V input rating ensure uninterrupted operation across full automotive voltage extremes. |
Use Scenario: Powering 5V analog front-ends and low-power sensors in factory automation PLC modules with 24V DC input. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering clean, low-noise 5V supply with minimal external components. Use Value: 2.5µA quiescent current enables energy-efficient sleep modes; <5mVP-P ripple avoids ADC measurement errors. |
| Portable Medical Device Power | Smart Building Controller |
Use Scenario: Generating 5V from dual-cell Li-ion (6–8.4V) or 9V alkaline for handheld diagnostic tools requiring long battery life. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in Burst Mode during standby to extend battery runtime. Use Value: 1.7µA IQ in Burst Mode enables multi-year operation on coin-cell or AA batteries. |
Use Scenario: Providing isolated 5V rail for Zigbee/Z-Wave radio modules and environmental sensors in battery- or energy-harvesting powered controllers. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC stage supporting intermittent wireless transmission bursts. Use Value: 3mm × 2mm DFN package saves space on dense IoT PCBs; PG flag synchronizes radio wake-up with stable supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3970EDDB-5#TRPBF | Same silicon, E-grade (0°C to 125°C) vs I-grade (–40°C to 125°C); identical electrical specs and pinout. | Not qualified for extended temperature automotive or industrial environments requiring –40°C startup. | Select LT3970IDDB-5#TRMPBF when guaranteed operation down to –40°C is required; E-grade suffices for commercial indoor use. |
| LMR36506RNXR | 65V-input, 600mA synchronous buck; higher IQ (26µA), no integrated catch diode, different pinout and footprint. | Lacks AEC-Q100 qualification and Burst Mode ripple performance; requires external diode and compensation. | Choose LMR36506RNXR only if >40V input or >350mA load is needed; LT3970IDDB-5#TRMPBF offers superior low-IQ and integration for 5V/350mA use cases. |
Compared with LT3970EDDB-5#TRPBF, the LT3970IDDB-5#TRMPBF guarantees –40°C operation and AEC-Q100 compliance; versus LMR36506RNXR, it delivers lower quiescent current, integrated diodes, and tighter output ripple - making it optimal for space-constrained, low-power, automotive-qualified 5V regulation.
Availability
LT3970IDDB-5#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power supplies, and portable medical device power requiring stable component supply, AEC-Q100 compliance, and ultra-low quiescent current.
Supply support for LT3970IDDB-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 is designed for high-input-voltage, low-quiescent-current step-down regulation in space- and power-constrained applications - emphasizing integration, thermal efficiency, and automotive reliability.
FAQ
What is the output voltage tolerance of the LT3970IDDB-5#TRMPBF over temperature?
The LT3970IDDB-5#TRMPBF delivers a fixed 5.0V output with ±1.2% tolerance over the full –40°C to +125°C operating 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 and temperature sweeps - ensuring reliable 5V rail generation for downstream logic and analog circuits without external calibration.
Does the LT3970IDDB-5#TRMPBF require external diodes?
No, the LT3970IDDB-5#TRMPBF integrates both the boost diode and catch Schottky diode on-die, eliminating the need for two external diodes. This integration reduces bill-of-materials cost, PCB area, and forward-voltage losses - directly contributing to the device's high efficiency and <5mVP-P output ripple in Burst Mode operation.
How does the power good (PG) flag behave on the LT3970IDDB-5#TRMPBF?
The PG pin on the LT3970IDDB-5#TRMPBF is an open-drain output that remains low until the 5V output reaches 90% (4.5V) of its nominal value, then pulls high via an external pull-up resistor. It is valid only when VIN > 4.2V and EN is high, and sinks up to 80µA - enabling reliable system power sequencing and microcontroller reset assertion without additional supervision ICs.
What is the minimum input voltage required for the LT3970IDDB-5#TRMPBF to regulate 5V output?
The LT3970IDDB-5#TRMPBF requires a minimum input voltage of 4.2V to operate, as specified in Absolute Maximum Ratings and Electrical Characteristics. At 5V output, practical minimum VIN is ~5.7V due to duty cycle limits - calculated using VIN(MIN) = (VOUT + VD) / (1 – fSW × tOFF(MIN)) – VD + VSW, where VD ≈ 0.7V and tOFF(MIN) = 160ns. This ensures stable regulation across all switching frequencies.
Is the LT3970IDDB-5#TRMPBF pin-compatible with other LT3970 variants in the same package?
Yes, all LT3970 variants in the 10-lead DFN package - including LT3970IDDB-3.3#TRMPBF, LT3970IDDB-3.42#TRMPBF, and LT3970IDDB-5#TRMPBF - share identical pinout and footprint. The only functional difference is the internal feedback divider ratio, which sets the fixed output voltage; no PCB redesign is needed when selecting between these variants.
LT3970IDDB-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)
LT3970IDDB-5#TRMPBF FAQ
1.How can I place an order for LT3970IDDB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970IDDB-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 LT3970IDDB-5#TRMPBF reliable?
The price and inventory of LT3970IDDB-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 LT3970IDDB-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970IDDB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970IDDB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970IDDB-5#TRMPBF?
LT3970IDDB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970IDDB-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 LT3970IDDB-5#TRMPBF?
For technical support, including LT3970IDDB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970IDDB-5#TRMPBF requirements.
6.How does Aetrix verify that LT3970IDDB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970IDDB-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 LT3970IDDB-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970IDDB-5#TRMPBF?
All LT3970IDDB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970IDDB-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 LT3970IDDB-5#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970IDDB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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