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Analog Devices Inc. LT3970EMS-5#TRPBF
- Part No.:
- LT3970EMS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3970EMS-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:591
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Product details
Overview
LT3970EMS-5#TRPBF from Analog Devices is a fixed 5V, 350mA monolithic step-down switching regulator with integrated boost and catch diodes, 2.5µA quiescent current, and 200kHz–2.2MHz adjustable switching frequency. It operates from 4.2V to 40V input and delivers low-noise power for automotive battery regulation and portable industrial supplies.
For engineers reviewing the LT3970EMS-5#TRPBF datasheet, LT3970EMS-5#TRPBF pinout, LT3970EMS-5#TRPBF application, or LT3970EMS-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 0.7µA shutdown current, Power Good flag, internal compensation, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970EMS-5#TRPBF uses current-mode control for fast transient response and stable loop behavior across wide input ranges. Its integrated bipolar NPN switch is driven via an external BOOST capacitor to ensure full saturation, enabling high efficiency at high VIN/VOUT ratios.
Burst Mode® operation maintains <5mVP-P output ripple at light loads while reducing quiescent current to 1.7µA. The device includes internal catch diode current limiting (400mA valley limit), accurate 1V EN threshold with 30mV hysteresis, and a PG flag asserting when VOUT reaches 90% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% over –40°C to 125°C; enables direct replacement of linear regulators without feedback divider. |
| Max Output Current | 350mA continuous; limited by catch diode valley current (400mA typ) and switch peak current (700mA typ). |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; supports always-on systems in automotive and IoT edge nodes. |
| Input Voltage Range | 4.2V to 40V operating; accommodates 12V/24V automotive batteries with cold-crank and load-dump margin. |
| Switching Frequency | 200kHz to 2.2MHz via RT resistor; allows optimization of inductor size vs. efficiency for space-constrained designs. |
| Power Good Flag | Open-drain PG asserts when VOUT ≥ 90% of 5V (i.e., ≥4.5V); provides system-level power sequencing and fault detection. |
| Shutdown Current | 0.7µA; enables ultra-low-power sleep modes in battery-backed applications. |
Pinout & Package
LT3970EMS-5#TRPBF is housed in a 10-lead plastic MSOP package (θJA = 100°C/W) with exposed pad not connected internally; pins are electrically defined as follows:
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Fixed-output voltage node | Internally regulated to 5.0V; connects directly to output capacitor and load; no external feedback required. |
| EN (Pin 2) | Enable control input | Hysteretic 1V rising threshold; pulls low to disable regulator and reduce input current to 0.7µA. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; must be bypassed locally with ≥1µF X7R ceramic capacitor. |
| GND (Pins 4, 5) | Signal and power ground | Low-impedance return path for control logic and power stage; requires solid PCB copper pour. |
| SW (Pin 6) | Switch node | Connects to inductor; carries high di/dt switching current; layout critical for EMI and efficiency. |
| BOOST (Pin 7) | Bootstrap drive supply | Requires external capacitor to generate >VIN voltage for NPN switch saturation; max rating 55V. |
| BD (Pin 8) | Boost diode anode | Accepts external bias ≥3.2V to improve efficiency; also powers internal regulator when active. |
| PG (Pin 9) | Power Good indicator | Open-drain output; pulled high externally; signals valid 5V rail for downstream microcontroller reset or enable. |
| RT (Pin 10) | Frequency programming | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz; determines inductor/capacitor sizing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost & Catch Diodes | Eliminates 2 external diodes; reduces BOM count, board area, and thermal stress in compact 10-pin MSOP footprint. |
| Low-Ripple Burst Mode® | Maintains <5mVP-P output ripple at light loads while achieving 1.7µA IQ, extending battery life in standby. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to 125°C); qualified per stress test requirements for engine control and infotainment. |
| Internal Compensation | Reduces design time and component count; no external compensation network required for stable operation. |
| Catch Diode Current Limit | 400mA valley limit protects against short-circuit faults without external sensing; enables robust operation in harsh environments. |
Applications
| Automotive Battery Regulation | Portable Industrial Sensor Node |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V for CAN transceiver, MCU, and sensor interface under cold-crank (4.2V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, ripple-controlled 5V rail with Power Good signaling for system boot sequencing. Use Value: AEC-Q100 qualification, 40V absolute max input, and 0.7µA shutdown current ensure reliability and low parasitic drain in always-connected automotive modules. | Use Scenario: Powering wireless sensor nodes (e.g., LoRaWAN or NB-IoT edge devices) from primary lithium thionyl chloride (LiSOCl₂) cells or 2S Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering regulated 5V to microcontroller, radio, and analog front-end during burst transmission cycles. Use Value: 2.5µA quiescent current extends multi-year battery life; Burst Mode® maintains <5mV ripple during receive/listen states without compromising sleep current. |
| Industrial 24V Field Bus Interface | Medical Point-of-Care Diagnostic Module |
Use Scenario: Converting 24V industrial bus voltage to clean 5V for RS-485 transceivers, isolation drivers, and FPGA configuration logic in factory automation equipment. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator with integrated diodes and PG flag, enabling robust power domain partitioning and fault reporting. Use Value: Wide 4.2V–40V input range handles brownouts and surges; internal compensation simplifies compliance with IEC 61000-4 immunity standards. | Use Scenario: Supplying 5V to microcontroller, display driver, and precision ADC in handheld diagnostic tools powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Primary power management IC ensuring low-noise, tightly regulated 5V rail for sensitive analog signal chains and real-time processing. Use Value: Fixed 5V output eliminates feedback resistor errors; <5mVP-P ripple prevents noise coupling into ECG/SpO₂ measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3970EDDB-5#TRPBF | Same electrical specs and 5V fixed output; uses 3mm × 2mm DFN package (θJA = 76°C/W) instead of MSOP. | Preferred for higher power density and better thermal performance in space-constrained PCB layouts. | Select when thermal dissipation >1W is expected or when footprint reduction is critical. |
| LMR36506RNXR | 65V-input, 600mA buck; 26µA IQ; no integrated catch diode; requires external diode and compensation. | Higher input voltage capability but lacks AEC-Q100 qualification and low-noise Burst Mode®. | Choose only if >40V input or >350mA load is required; not drop-in compatible due to different pinout and external components. |
Compared with LT3970EDDB-5#TRPBF, the LT3970EMS-5#TRPBF offers identical regulation performance but trades thermal efficiency for easier hand-soldering and legacy MSOP footprint compatibility; versus LMR36506RNXR, it provides lower IQ, integrated diodes, and automotive qualification at the cost of input voltage headroom.
Availability
LT3970EMS-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable industrial sensor nodes, and medical point-of-care diagnostic modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3970EMS-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 was designed specifically for high-reliability, wide-input-voltage DC/DC conversion in automotive and industrial environments where low quiescent current, integrated power stages, and AEC-Q100 compliance are mandatory.
FAQ
What is the output voltage tolerance of the LT3970EMS-5#TRPBF over temperature?
The LT3970EMS-5#TRPBF 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 (typical 4.94V to 5.06V). This tight regulation is achieved via laser-trimmed internal feedback and is validated across automotive-grade thermal cycling.
Does the LT3970EMS-5#TRPBF require an external feedback resistor network?
No, the LT3970EMS-5#TRPBF does not require an external feedback resistor network. As a fixed-output variant, it internally regulates the VOUT pin (Pin 1) to 5.0V using a factory-trimmed divider-eliminating external resistors and associated tolerance errors that affect adjustable versions like the LT3970.
How does the Power Good (PG) flag on the LT3970EMS-5#TRPBF behave during startup?
The PG pin on the LT3970EMS-5#TRPBF is an open-drain output that remains low until VOUT reaches 90% of its regulated value (≥4.5V). It becomes valid only when both EN is high and VIN exceeds 4.2V. Once asserted, PG stays high during normal operation and drops low during undervoltage or shutdown events.
Can the LT3970EMS-5#TRPBF operate with input voltages below 4.2V?
No, the LT3970EMS-5#TRPBF requires a minimum input voltage of 4.2V to operate. Below this threshold, the internal regulator cannot sustain bias, and the device will not regulate. If VIN falls below 4.2V, the EN pin must be grounded to force shutdown and minimize leakage current to 0.7µA.
What is the maximum achievable switching frequency for the LT3970EMS-5#TRPBF?
The LT3970EMS-5#TRPBF supports a maximum switching frequency of 2.2MHz, set by connecting a 42.2kΩ resistor from the RT pin (Pin 10) to ground. At this frequency, minimum on-time (~150ns) and off-time (~160ns) constraints remain within specification, enabling use of sub-2.2µH inductors in compact designs.
LT3970EMS-5#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):
- 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-MSOP
LT3970EMS-5#TRPBF FAQ
1.How can I place an order for LT3970EMS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EMS-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 LT3970EMS-5#TRPBF reliable?
The price and inventory of LT3970EMS-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 LT3970EMS-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EMS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EMS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EMS-5#TRPBF?
LT3970EMS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EMS-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 LT3970EMS-5#TRPBF?
For technical support, including LT3970EMS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EMS-5#TRPBF requirements.
6.How does Aetrix verify that LT3970EMS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EMS-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 LT3970EMS-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EMS-5#TRPBF?
All LT3970EMS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EMS-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 LT3970EMS-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EMS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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