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Analog Devices Inc. LT3970EMS#TRPBF
- Part No.:
- LT3970EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3970EMS#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,727
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Product details
Overview
LT3970EMS#TRPBF from Analog Devices is a 40V, 350mA adjustable-frequency monolithic buck switching regulator with integrated boost and catch diodes, 2.5µA quiescent current, and low-ripple Burst Mode operation delivering <5mVP-P output ripple. It regulates output voltage from 1.21V to 25V in a 10-lead MSOP package and is used in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3970EMS#TRPBF datasheet, LT3970EMS#TRPBF pinout, LT3970EMS#TRPBF application, or LT3970EMS#TRPBF equivalent, key selection criteria include input voltage range (4.2V–40V), switching frequency adjustability (200kHz–2.2MHz), integrated diode topology, power good flag functionality, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970EMS#TRPBF employs current-mode control for fast transient response and loop stability, with internal compensation eliminating external compensation components. Its Burst Mode operation maintains high efficiency at light loads while suppressing output ripple below 5mVP-P.
It integrates a bipolar NPN power switch, boost diode, catch diode, oscillator, and error amplifier. The enable pin features a precise 1V threshold with 30mV hysteresis, and the open-drain power good (PG) flag asserts when FB reaches 90% of regulation-valid only when VIN > 4.2V and EN is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 40V - supports wide-range industrial and automotive battery inputs without external pre-regulation |
| Output Current | 350mA - maximum continuous load current limited by catch diode valley current specification |
| Quiescent Current | 2.5µA at 12VIN to 3.3VOUT - enables ultra-low-power always-on systems such as automotive body electronics |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; higher frequencies allow smaller magnetics but reduce max input voltage tolerance |
| Feedback Reference | 1.21V ±1.2% - sets output voltage via external resistor divider; stable over –40°C to 125°C junction temperature |
| Power Good Threshold | 90% of regulated FB voltage - provides reliable startup monitoring with 12mV hysteresis to prevent chatter during brown-out conditions |
| Shutdown Current | 0.7µA - ensures minimal battery drain during system sleep or disable states |
Pinout & Package
LT3970EMS#TRPBF is housed in a 10-lead plastic MSOP package (θJA = 100°C/W), with pins 4 and 5 tied to GND and exposed pad absent (unlike DFN variant). All pins are surface-mount compatible and require standard reflow profiles.
| 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 1V rising threshold; pulls device into shutdown (<0.7µA IQ) 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) | Ground reference | Dual ground connections improve thermal and noise performance; both pins must be connected to PCB ground plane |
| SW (Pin 6) | Switch node | Drives external inductor; carries high di/dt switching current; requires tight layout to minimize EMI |
| BOOST (Pin 7) | Bootstrap drive | Provides elevated gate drive voltage for internal NPN switch; requires external capacitor between BOOST and SW |
| BD (Pin 8) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when BD > 3.2V for improved efficiency |
| PG (Pin 9) | Power good flag | Open-drain output; pulled low until FB reaches 90% of target; requires external pull-up for logic-level signaling |
| RT (Pin 10) | Frequency set | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz; determines inductor/capacitor sizing trade-offs |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates four external diodes, reducing BOM count, board area, and forward drop losses in compact designs |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while achieving 2.5µA quiescent current-critical for battery longevity |
| Internal compensation | Removes need for external compensation network, simplifying design and improving production consistency |
| AEC-Q100 qualified | Rated for automotive applications across –40°C to 125°C ambient; validated for reliability under temperature cycling, humidity, and vibration stress |
| Catch diode current limit | Valley-current limiting at ~400mA protects against short-circuit faults without requiring external current-sense resistors |
Applications
| Automotive Body Control Module | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and LIN interfaces in door modules and seat controllers with direct connection to 12V battery rail. IC Role / Device Role / Timing Role: Primary step-down regulator converting 9V–16V battery input to stable 3.3V or 5V for digital logic and communication ICs. Use Value: 2.5µA quiescent current prevents excessive battery drain during vehicle sleep mode; AEC-Q100 qualification ensures compliance with automotive reliability standards. | Use Scenario: Providing regulated 3.3V supply to low-power wireless sensor nodes deployed in factory automation environments with wide input voltage variation. IC Role / Device Role / Timing Role: Main DC/DC converter handling unregulated 12V–24V industrial bus input, delivering clean 3.3V to MCU and RF transceiver. Use Value: 40V absolute max input rating tolerates 24V system transients; low-ripple Burst Mode ensures stable ADC reference and RF performance at µA-level sleep currents. |
| Portable Medical Instrument | Railway Signaling Interface |
Use Scenario: Powering handheld diagnostic devices operating from rechargeable Li-ion or alkaline batteries with variable voltage profiles. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting multiple voltage rails (e.g., 1.8V for memory, 3.3V for processor) via feedback resistor changes. Use Value: Wide 4.2V–40V input range accommodates 1–4 cell battery stacks; internal diodes eliminate reverse-polarity protection diode loss in space-constrained enclosures. | Use Scenario: Regulating 72V or 110V nominal railway traction power to 5V for isolated communication interfaces and status LEDs. IC Role / Device Role / Timing Role: Pre-regulator stage stepping down high-voltage DC bus to intermediate 5V rail before final LDO filtering. Use Value: 40V operating input allows safe operation with 72V nominal systems using external resistive divider on VIN; robust thermal design supports extended life in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SISM#TRPBF | Higher 42V input rating, 2.5A output, synchronous rectification, 2.5µA IQ - but larger 16-lead LQFN package and no integrated catch diode | Better suited for higher-current industrial applications; lacks integrated catch diode, requiring external Schottky | Select when >350mA load or synchronous efficiency is required; avoid if footprint or diode integration are critical |
| TPS54332DR | 3.5V–28V input, 3A output, 4.5µA IQ, external diode - no AEC-Q100 rating, different pinout, no PG flag | Targeted at cost-sensitive consumer/industrial designs; not qualified for automotive use | Choose for non-automotive 3A applications where lower IQ is not mandatory; verify PG signal replacement in system monitoring |
Compared with LT3970EMS#TRPBF, LT8609SISM#TRPBF delivers higher current and input voltage but sacrifices diode integration and package size, while TPS54332DR offers higher output current at the expense of automotive qualification, power good signaling, and quiescent current performance.
Availability
LT3970EMS#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor node power, and portable medical instrument applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3970EMS#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 was designed specifically for high-input-voltage, low-quiescent-current buck conversion in harsh environments-emphasizing integrated diodes, Burst Mode efficiency, and automotive-grade reliability.
FAQ
What is the maximum input voltage rating for LT3970EMS#TRPBF?
The LT3970EMS#TRPBF has an absolute maximum VIN rating of 40V and a recommended operating range of 4.2V to 40V. Exceeding 40V may cause permanent damage. During transients above the calculated operational maximum (VIN(OP-MAX)), the device reduces switching frequency to maintain regulation-but sustained overvoltage must be avoided using external clamping or filtering.
Does LT3970EMS#TRPBF require external diodes?
No, LT3970EMS#TRPBF integrates both the boost diode and catch diode on-die, eliminating the need for external discrete diodes. This reduces component count, PCB area, and conduction losses. External diodes are only required if using the BD pin for auxiliary biasing or in specific fault-tolerant configurations-not for basic operation.
How does the power good (PG) flag behave on LT3970EMS#TRPBF?
The PG pin on LT3970EMS#TRPBF is an open-drain output that remains low until the FB pin reaches 90% of its regulated 1.21V reference. It is valid only when VIN > 4.2V and EN is high. An external pull-up resistor is required to generate a logic-high signal; typical values range from 10kΩ to 100kΩ depending on rise-time requirements.
Can LT3970EMS#TRPBF operate in Burst Mode with fixed-frequency PWM?
Yes, LT3970EMS#TRPBF automatically enters low-ripple Burst Mode at light loads to maintain 2.5µA quiescent current and <5mVP-P output ripple. At higher loads, it seamlessly transitions to fixed-frequency current-mode PWM operation. No external control is needed-the mode switching is fully internal and transparent to the user.
Is LT3970EMS#TRPBF pin-compatible with other variants in the LT3970 family?
Yes, all LT3970 variants-including LT3970EMS#TRPBF, LT3970EMS-3.3#TRPBF, and LT3970EMS-5#TRPBF-share identical 10-lead MSOP pinouts and thermal characteristics. Only the feedback network differs: the base LT3970EMS#TRPBF uses external resistors for adjustable output, while fixed-output versions embed the divider internally and repurpose Pin 1 as VOUT instead of FB.
LT3970EMS#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:
- 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-MSOP
LT3970EMS#TRPBF FAQ
1.How can I place an order for LT3970EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EMS#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#TRPBF reliable?
The price and inventory of LT3970EMS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EMS#TRPBF?
LT3970EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EMS#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#TRPBF?
For technical support, including LT3970EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EMS#TRPBF requirements.
6.How does Aetrix verify that LT3970EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EMS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EMS#TRPBF?
All LT3970EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EMS#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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