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Analog Devices Inc. LT3970EMS-5#PBF
- Part No.:
- LT3970EMS-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3970EMS-5#PBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
LT3970EMS-5#PBF from Analog Devices is a 40V, 350mA fixed-output step-down regulator in a 10-lead MSOP package, featuring 2.5µA quiescent current, integrated boost and catch diodes, and a power good flag. It delivers regulated 5V output with ±1.2% accuracy over –40°C to 125°C and supports automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3970EMS-5#PBF datasheet, LT3970EMS-5#PBF pinout, LT3970EMS-5#PBF application, or LT3970EMS-5#PBF equivalent, key selection criteria include input voltage range (4.2V–40V), low-noise Burst Mode operation (<5mVP-P ripple), enable threshold accuracy (1V ±60mV), and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970EMS-5#PBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) set via external RT resistor. Its internal bipolar NPN switch, integrated Schottky diodes, and internal compensation eliminate need for external loop components.
Burst Mode operation maintains high efficiency at light loads while limiting output ripple to <5mVP-P; the power good flag asserts when VOUT reaches 90% of nominal 5V, and the 0.7µA shutdown current supports ultra-low-power standby states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% over –40°C to 125°C; eliminates external feedback divider and reduces BOM count. |
| Input Voltage Range | 4.2V to 40V operating; supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; enables multi-year battery life in always-on sensor nodes. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin; allows optimization of inductor size vs. efficiency trade-off. |
| Output Current | 350mA continuous; limited by internal catch diode valley current (400mA typ.) and switch peak current (700mA typ.). |
| Power Good Flag | Open-drain PG pin asserts when VOUT ≥ 4.5V; provides system-level power sequencing and fault detection. |
| Enable Threshold | 1.0V ±60mV rising edge; ensures precise, noise-immune startup control with hysteresis. |
Pinout & Package
LT3970EMS-5#PBF is housed in a 10-lead plastic MSOP package (θJA = 100°C/W) with exposed pad not present (DFN variant has exposed GND pad; MSOP does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/VOUT (Pin 1) | Fixed-output feedback node | Internally connected to 5V regulation divider; no external resistors required for 5V output. |
| EN (Pin 2) | Enable control input | Hysteretic 1V threshold enables precise low-power shutdown with 0.7µA IQ. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; rated to 40V absolute max; requires local ceramic bypass. |
| GND (Pins 4, 5) | Signal and power ground | Dual GND pins reduce ground impedance and improve thermal dissipation in MSOP package. |
| SW (Pin 6) | Switch node | Connects to inductor; carries high di/dt switching current; layout critical for EMI control. |
| BOOST (Pin 7) | Bootstrap drive supply | Drives internal NPN switch; requires external capacitor to generate >VIN voltage for full saturation. |
| BD (Pin 8) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V. |
| PG (Pin 9) | Power good indicator | Open-drain output pulled high externally; signals valid 5V regulation (≥4.5V) with 12mV hysteresis. |
| RT (Pin 10) | Frequency programming | Resistor-to-ground sets switching frequency; 226kΩ yields 600kHz per typical application. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost & catch diodes | Eliminates 2 external Schottky diodes, reducing board area and component count in space-constrained designs. |
| Low-ripple Burst Mode® | Maintains <5mVP-P output ripple at light loads while achieving 2.5µA IQ, enabling silent operation in sensitive analog systems. |
| AEC-Q100 qualified | Rated for automotive applications (Grade E/I); validated for –40°C to 125°C operation with robust ESD and latch-up immunity. |
| Internal compensation | Removes need for external compensation network, simplifying design and improving production yield across temperature and load variation. |
| Catch diode current limit | 400mA valley current limit protects against short-circuit faults without external sensing, enhancing system reliability. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V for infotainment microcontrollers and CAN transceivers under cold-crank (4.2V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary DC/DC buck converter providing isolated, ripple-controlled 5V rail with power good signaling for system boot sequencing. Use Value: 40V absolute max input withstands automotive transients; 2.5µA quiescent current meets ISO 16750-2 sleep mode requirements. | Use Scenario: Powering programmable logic controllers (PLCs) and industrial sensors from unregulated 24V DC bus with high line regulation and thermal stability. IC Role / Device Role / Timing Role: Fixed-output step-down regulator delivering clean 5V to FPGA I/O banks and ADC reference circuits. Use Value: ±1.2% output accuracy and <5mVP-P ripple ensure data integrity in precision measurement systems. |
| Portable Product Power | Connected Device Power |
Use Scenario: Supplying 5V to Bluetooth LE modules and environmental sensors in battery-powered asset trackers operating for >5 years on coin cells. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling long-term energy harvesting and battery backup operation. Use Value: 2.5µA quiescent current extends battery life; Burst Mode maintains regulation without audible ceramic capacitor noise. | Use Scenario: Providing regulated 5V to Wi-Fi 6 IoT gateways and smart home hubs with multiple USB peripherals and RF front-ends. IC Role / Device Role / Timing Role: Main system power rail generator with PG flag coordinating firmware initialization and peripheral enumeration. Use Value: Power good assertion at 4.5V enables deterministic boot timing; 350mA output supports concurrent RF + MCU + memory operation. |
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#PBF | 42V input, 2.5A output, 2.5µA IQ, synchronous rectification, 3mm × 4mm LQFN | Higher current capability and smaller footprint; lacks fixed 5V option (requires FB divider) | Select when >350mA load or synchronous efficiency is required; rework needed for FB network and layout. |
| TPS54302DDAR | 28V input, 3A output, 26µA IQ, adjustable output, SO-8 package | Higher current but 10× higher quiescent current; no integrated diodes; requires external compensation | Select for cost-sensitive industrial designs where 26µA IQ is acceptable and external diodes are tolerable. |
Compared with LT8609SISM#PBF and TPS54302DDAR, the LT3970EMS-5#PBF offers lowest quiescent current and fixed 5V output in MSOP, making it optimal for space- and power-constrained automotive and portable applications where simplicity and ultra-low standby loss are critical.
Availability
LT3970EMS-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable product power requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for LT3970EMS-5#PBF 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, ultra-low-quiescent-current DC/DC conversion in automotive and industrial environments where reliability under harsh electrical conditions is mandatory.
FAQ
What is the output voltage tolerance of the LT3970EMS-5#PBF over temperature?
The LT3970EMS-5#PBF delivers 5V output with ±1.2% tolerance across the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table for LT3970-5 Output Voltage. This tight tolerance ensures reliable operation of downstream 5V logic without additional regulation.
Does the LT3970EMS-5#PBF require external diodes?
No, the LT3970EMS-5#PBF integrates both the boost and catch Schottky diodes on-die, eliminating the need for external diodes. This integration reduces bill-of-materials count, PCB area, and potential failure points-confirmed in the Features section and Block Diagram of the LT3970 datasheet.
What is the minimum input voltage required for the LT3970EMS-5#PBF to regulate 5V output?
The LT3970EMS-5#PBF requires a minimum input voltage of 4.2V to operate and regulate its 5V output, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, the device cannot sustain regulation due to internal circuitry and switch limitations.
How does the power good (PG) flag behave on the LT3970EMS-5#PBF?
The PG pin on the LT3970EMS-5#PBF is an open-drain output that remains low until VOUT reaches 90% of 5V (i.e., 4.5V), then pulls high via external pull-up. It is valid only when EN is high and VIN > 4.2V, and includes 12mV hysteresis to prevent chatter during marginal conditions-per Electrical Characteristics and Pin Functions sections.
Is the LT3970EMS-5#PBF pin-compatible with other LT3970 variants in MSOP packages?
Yes, all LT3970 MSOP variants-including LT3970EMS-5#PBF, LT3970EMS-3.3#PBF, and LT3970EMS#PBF-share identical 10-pin MSOP footprints and pinouts. The only functional difference is the internal feedback divider; no PCB layout change is needed when substituting between fixed-output or adjustable versions.
LT3970EMS-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3970EMS-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EMS-5#PBF 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#PBF reliable?
The price and inventory of LT3970EMS-5#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT3970EMS-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EMS-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EMS-5#PBF?
LT3970EMS-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EMS-5#PBF 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#PBF?
For technical support, including LT3970EMS-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EMS-5#PBF requirements.
6.How does Aetrix verify that LT3970EMS-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3970EMS-5#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3970EMS-5#PBF?
All LT3970EMS-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EMS-5#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3970EMS-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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