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Analog Devices Inc. LT3970EMS-3.3#TRPBF
- Part No.:
- LT3970EMS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3970EMS-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:593
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Product details
Overview
LT3970EMS-3.3#TRPBF from Analog Devices is a fixed 3.3V, 350mA monolithic step-down regulator with 2.5µA quiescent current, integrated boost and catch diodes, and low-ripple Burst Mode operation. It operates from 4.2V to 40V input, delivers <5mVP-P output ripple, and features power good flag and accurate 1V enable threshold - used in automotive battery regulation and portable power supplies.
For engineers reviewing the LT3970EMS-3.3#TRPBF datasheet, LT3970EMS-3.3#TRPBF pinout, LT3970EMS-3.3#TRPBF application, or LT3970EMS-3.3#TRPBF equivalent, key selection criteria include its 3.3V fixed output, 10-pin MSOP package, AEC-Q100 qualification, and compatibility with high-input-voltage industrial and automotive systems requiring ultra-low IQ and robust fault protection.
Technical Context
The LT3970EMS-3.3#TRPBF implements constant-frequency current-mode control with internal compensation, enabling fast transient response and stable loop behavior across wide input ranges. Its architecture integrates bipolar NPN switch, boost diode, and catch Schottky diode on-die - eliminating external diodes while supporting 200kHz–2.2MHz programmable switching frequency via RT pin resistor.
Burst Mode operation maintains efficiency at light loads by disabling non-essential circuitry, reducing input current to 1.7µA; the power good (PG) flag asserts when VOUT reaches 90% of 3.3V (i.e., 2.97V), with 12mV hysteresis and open-drain output - critical for system sequencing and fault monitoring in safety-aware designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 125°C; enables direct replacement of LDOs in noise-sensitive 3.3V rail applications. |
| Max Output Current | 350mA continuous; limited by internal catch diode valley current limit - defines maximum load without external current sensing. |
| Quiescent Current | 2.5µA at 12VIN to 3.3VOUT; supports always-on automotive modules with battery drain below 10µA per rail. |
| Input Voltage Range | 4.2V to 40V operating; accommodates 12V/24V automotive batteries including cold-crank and load-dump transients. |
| Switching Frequency | 200kHz to 2.2MHz via RT pin; allows trade-off between inductor size (e.g., 2.2µH at 600kHz) and EMI profile. |
| Output Ripple | <5mVP-P in typical application; achieved via low-ripple Burst Mode and internal compensation - eliminates need for post-regulation filtering. |
| Enable Threshold | 1.0V rising edge (±60mV); provides precise, hysteresis-enabled startup control compatible with microcontroller GPIOs. |
Pinout & Package
LT3970EMS-3.3#TRPBF uses a 10-lead plastic MSOP package (θJA = 100°C/W), with exposed pad not present (unlike DFN variant). Pin functions are defined per Analog Devices Rev. D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Fixed-output voltage node | Internally regulated to 3.3V; connects to feedback divider tap in adjustable versions but serves as direct output in -3.3 variant. |
| EN (Pin 2) | Enable control input | Hysteretic 1V threshold; pulls device into 0.7µA shutdown when low - enables system-level power gating. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; must be locally bypassed with ≥1µF X7R ceramic capacitor. |
| GND (Pins 4, 5) | Signal and power ground | Dual ground pins reduce ground impedance; require low-inductance PCB connection to minimize noise coupling. |
| SW (Pin 6) | Switch node | Drives external inductor; carries high di/dt square wave - demands tight layout with minimal trace length. |
| BOOST (Pin 7) | Bootstrap drive supply | Requires external capacitor to generate >VIN voltage; enables full saturation of internal bipolar NPN switch. |
| BD (Pin 8) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V - improves light-load efficiency. |
| PG (Pin 9) | Power good flag | Open-drain output asserting when VOUT ≥ 2.97V; requires external pull-up for system monitoring and sequencing. |
| RT (Pin 10) | Frequency setting | Resistor-to-ground sets switching frequency; 226kΩ yields 600kHz - balances size, efficiency, and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external Schottky diodes - reduces BOM count, PCB area, and thermal stress in compact automotive modules. |
| Low-ripple Burst Mode® operation | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA - essential for RF and sensor rails requiring clean DC. |
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature; validated for automotive battery regulation, infotainment, and ADAS subsystems. |
| Internal sense limits catch diode current | Clamps valley current at ~400mA - protects against short-circuit faults without external current-sense resistors or ICs. |
| Power good flag with 12mV hysteresis | Provides reliable system reset signaling with noise immunity - avoids false triggers during line transients or brownouts. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V for MCU, CAN transceiver, and sensors during cold-crank (4.2V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise 3.3V rail with AEC-Q100 reliability and ultra-low IQ for always-on domains. Use Value: 2.5µA quiescent current prevents excessive battery drain; integrated diodes reduce thermal footprint in space-constrained junction boxes. | Use Scenario: Powering handheld medical devices or IoT edge nodes from single-cell Li-ion (4.2V) or multi-cell alkaline (up to 40V) sources. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering regulated 3.3V to low-power microcontrollers and BLE radios with minimal external components. Use Value: <5mVP-P ripple ensures clean analog sensor readings; Burst Mode extends battery life beyond 1 year in sleep-dominated use cases. |
| Industrial Sensor Node | Smart Building Control |
Use Scenario: Converting 24V industrial bus voltage to 3.3V for MEMS accelerometers, temperature sensors, and LoRaWAN modems in harsh factory environments. IC Role / Device Role / Timing Role: Robust front-end regulator handling wide input transients and ESD events while maintaining precision output stability. Use Value: 40V absolute max rating and internal current limiting protect against wiring faults; 10-pin MSOP simplifies automated assembly on dense sensor PCBs. | Use Scenario: Supplying 3.3V to HVAC controllers, occupancy sensors, and wireless gateways powered from 24VAC/DC building infrastructure. IC Role / Device Role / Timing Role: High-efficiency, low-noise power stage enabling silent operation and long service intervals in wall-mounted devices. Use Value: Low EMI due to controlled switching edges and integrated diodes meets Class B FCC requirements; PG flag enables firmware-controlled power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SISM#TRPBF | 42V input, 2.5A output, 2.5µA IQ, synchronous rectification; no integrated catch diode required but adds external MOSFET. | Higher current capability and synchronous architecture suit higher-power applications; lacks fixed 3.3V option - requires external feedback resistors. | Select when >350mA load or higher efficiency at medium loads is required; verify layout compatibility with synchronous FET placement. |
| TPS62840DDCR | 6V input max, 1A output, 0.065µA IQ in shutdown, 0.3µA in operation; no boost/catch diodes - requires external components. | Ultra-low IQ ideal for coin-cell or energy-harvesting systems; unsuitable for automotive or industrial 12V/24V inputs due to 6V VIN limit. | Choose only for sub-6V battery-powered applications where nanoscale IQ dominates design priority over input range. |
Compared with LT3970EMS-3.3#TRPBF, LT8609SISM#TRPBF offers higher current and synchronous efficiency but requires more external components and lacks fixed 3.3V configuration, while TPS62840DDCR achieves dramatically lower operating IQ yet cannot support automotive or industrial input voltages - making LT3970EMS-3.3#TRPBF optimal for 4.2V–40V, 350mA, fixed-3.3V applications demanding integrated simplicity and AEC-Q100 compliance.
Availability
LT3970EMS-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, industrial sensor nodes, and smart building control requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT3970EMS-3.3#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-input-voltage, low-quiescent-current DC/DC conversion in automotive and industrial environments - emphasizing integration, reliability under transients, and ease of use in space-constrained designs.
FAQ
What is the output voltage tolerance of LT3970EMS-3.3#TRPBF over temperature?
The LT3970EMS-3.3#TRPBF guarantees a 3.3V output with ±1.2% tolerance over the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table (typical 3.3V, min 3.26V, max 3.34V at –40°C to 125°C). This tight regulation ensures compatibility with 3.3V logic interfaces without additional margining.
Does LT3970EMS-3.3#TRPBF require external diodes?
No, LT3970EMS-3.3#TRPBF integrates both the boost diode and catch Schottky diode on-die, eliminating the need for external diodes. This reduces component count, PCB area, and thermal complexity - confirmed in the Features section and Block Diagram of the Analog Devices datasheet Rev. D.
What is the minimum input voltage required for LT3970EMS-3.3#TRPBF to regulate 3.3V?
The LT3970EMS-3.3#TRPBF requires a minimum input voltage of 4.2V to operate and regulate 3.3V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 4.2V, the device cannot sustain regulation due to internal circuitry and switch saturation constraints.
How does the power good (PG) flag behave on LT3970EMS-3.3#TRPBF?
The PG pin on LT3970EMS-3.3#TRPBF is an open-drain output that remains low until VOUT reaches 90% of 3.3V (2.97V), then transitions high via external pull-up. It features 12mV hysteresis and is valid only when EN is high and VIN > 4.2V - enabling precise system power sequencing and fault detection.
Is LT3970EMS-3.3#TRPBF qualified for automotive applications?
Yes, LT3970EMS-3.3#TRPBF is AEC-Q100 qualified for automotive applications, rated for –40°C to 125°C operating junction temperature, and listed in the Automotive section of the Analog Devices order information table with #WPBF/#WTRPBF variants - confirming its suitability for battery regulation, infotainment, and ADAS subsystems.
LT3970EMS-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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):
- 3.3V
- 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-MSOP
LT3970EMS-3.3#TRPBF FAQ
1.How can I place an order for LT3970EMS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EMS-3.3#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 LT3970EMS-3.3#TRPBF reliable?
The price and inventory of LT3970EMS-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970EMS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EMS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EMS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EMS-3.3#TRPBF?
LT3970EMS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EMS-3.3#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 LT3970EMS-3.3#TRPBF?
For technical support, including LT3970EMS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EMS-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3970EMS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EMS-3.3#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 LT3970EMS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EMS-3.3#TRPBF?
All LT3970EMS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EMS-3.3#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 LT3970EMS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EMS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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