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Analog Devices Inc. LT3970EDDB#TRPBF
- Part No.:
- LT3970EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,467
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Product details
Overview
LT3970EDDB#TRPBF from Analog Devices is a 40V, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current, adjustable switching frequency (200kHz–2.2MHz), and power good flag - designed for automotive battery regulation and industrial supplies requiring ultra-low IQ and high input voltage tolerance.
For engineers reviewing the LT3970EDDB#TRPBF datasheet, LT3970EDDB#TRPBF pinout, LT3970EDDB#TRPBF application, or LT3970EDDB#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world load/efficiency behavior, and validated alternative options for AEC-Q100-compliant buck converter design.
Technical Context
The LT3970EDDB#TRPBF employs current-mode control with internal slope compensation for fast transient response and loop stability across wide VIN (4.2V–40V) and temperature (–40°C to 125°C). Its bipolar NPN switch is driven via an external BOOST capacitor to ensure full saturation at high duty cycles.
Burst Mode® operation maintains <5mVP-P output ripple at light loads while reducing IQ to 1.7µA; the catch diode current limit (350mA typical) and switch current limit (535mA min) jointly constrain maximum deliverable output current under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 40V - supports direct connection to 24V/36V automotive batteries without pre-regulation |
| Output Current | 350mA - limited by valley current sense on integrated catch diode, not just switch peak current |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables always-on systems with multi-year battery life in portable applications |
| Switching Frequency | 200kHz to 2.2MHz - set externally via RT resistor; higher frequencies allow smaller inductors but reduce max VIN/VOUT ratio |
| Feedback Reference | 1.21V ±1.2% - used with external resistor divider to program output from 1.21V to 25V |
| Power Good Threshold | 90% of regulated VOUT - open-drain PG flag asserts when FB reaches 90% of 1.21V reference |
| Enable Threshold | 1.0V rising (±60mV hysteresis) - accurate shutdown control with 0.7µA shutdown current |
Pinout & Package
LT3970EDDB#TRPBF is housed in a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Feedback input | Regulated to 1.21V; connects to resistor divider tap for adjustable output voltage |
| Pin 2 (EN) | Enable control | Hysteretic input with 1.0V rising threshold; pulls device into 0.7µA shutdown when low |
| Pin 3 (VIN) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF) |
| Pins 4, 5, 11 (GND) | Ground return | Multiple GND connections including exposed pad; essential for thermal dissipation and noise control |
| Pin 6 (SW) | Switch node | Drives external inductor; carries high dI/dt switching current and requires tight layout |
| Pin 7 (BOOST) | Bootstrap drive | Connects to external capacitor to generate >VIN voltage for NPN switch saturation |
| Pin 8 (BD) | Boost diode anode | Provides bias power to internal regulator when >3.2V; improves efficiency in fixed-output configurations |
| Pin 9 (PG) | Power good flag | Open-drain output asserting when FB reaches 90% of 1.21V; valid only if VIN > 4.2V and EN = high |
| Pin 10 (RT) | Frequency setting | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz per Table 1 |
Key Features
| Feature | Design Value |
|---|---|
| Low Ripple Burst Mode® | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA, enabling silent operation in battery-powered systems |
| Integrated diodes | On-die boost and catch Schottky diodes eliminate 2 external components and reduce board area vs discrete solutions |
| AEC-Q100 qualification | Qualified for automotive applications (Grade E, –40°C to 125°C junction), supporting under-hood and infotainment power rails |
| Internal compensation | Eliminates need for external compensation network - simplifies design and reduces BOM count |
| Catch diode current limit | Valley-current sensing protects against shorted outputs and overvoltage faults without external sensing resistors |
Applications
| Automotive Battery Regulation | Portable Medical Instrumentation |
|---|---|
Use Scenario: Regulating 12V–36V vehicle battery supply to 3.3V/5V for microcontrollers and sensors in ADAS modules. IC Role / Device Role / Timing Role: Primary buck converter providing stable, low-noise power with AEC-Q100 compliance and thermal robustness. Use Value: 2.5µA quiescent current prevents battery drain during vehicle sleep mode; 40V absolute max rating withstands load dump transients. |
Use Scenario: Powering handheld ultrasound or glucose monitors with coin-cell or Li-ion batteries requiring multi-year runtime. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter enabling always-on monitoring with minimal self-discharge. Use Value: 1.7µA Burst Mode current extends battery life; small 3mm×2mm DFN footprint saves space in compact enclosures. |
| Industrial Sensor Transmitters | Railway Signaling Interface |
Use Scenario: Converting 24V loop-powered field bus voltage to isolated 5V for analog front-end and digital logic in pressure/temperature transmitters. IC Role / Device Role / Timing Role: High-input-voltage buck regulator delivering clean, regulated power in harsh EMI environments. Use Value: Integrated diodes reduce component count and improve reliability; 100ns minimum off-time supports wide input range at 600kHz operation. |
Use Scenario: Powering CAN transceivers and microcontrollers from 72V–110V railway traction battery systems via intermediate 24V rail. IC Role / Device Role / Timing Role: Pre-regulator stage stepping down high-voltage DC to 5V/3.3V with robust fault protection. Use Value: Catch diode current limiting and 40V operating range enable safe operation with wide input tolerances; PG flag confirms regulation before system boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8607EMSE#TRPBF | 42V input, 350mA, 2.5µA IQ, synchronous rectification, 3mm × 4mm MSOP | Higher efficiency at medium loads due to synchronous FET; lacks BD pin for bias optimization | Choose for higher efficiency above 50mA; avoid if BD-driven efficiency gain at light loads is critical |
| TPS54331DR | 28V input, 3A, 4.5µA IQ, external diode, SOIC-8 | Higher output current but larger package and higher IQ; no integrated catch diode or PG flag | Choose for cost-sensitive industrial designs needing >350mA; avoid for automotive or ultra-low-IQ requirements |
Compared with LT3970EDDB#TRPBF, LT8607EMSE#TRPBF offers better full-load efficiency but sacrifices the BD pin's light-load optimization, while TPS54331DR provides higher current headroom at the expense of IQ, integration, and automotive qualification.
Availability
LT3970EDDB#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical instrumentation, and industrial sensor transmitters requiring stable component supply with AEC-Q100 compliance and ultra-low quiescent current.
Supply support for LT3970EDDB#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 precision instrumentation, industrial automation, and automotive markets.
The LT3970 series was designed specifically for high-input-voltage, ultra-low-IQ buck conversion in automotive and industrial environments where reliability, thermal performance, and integration of diodes and PG signaling are critical.
FAQ
What is the absolute maximum input voltage rating for LT3970EDDB#TRPBF?
The LT3970EDDB#TRPBF has an absolute maximum VIN rating of 40V. Exceeding this voltage risks permanent damage. During transient overvoltage events (e.g., automotive load dump), the part may reduce switching frequency to maintain regulation - but sustained operation above 40V is not permitted. Always verify input transient protection in final design.
Does LT3970EDDB#TRPBF require an external catch diode?
No, the LT3970EDDB#TRPBF integrates both the boost and catch Schottky diodes on-die. This eliminates two external components, reduces PCB area, and improves reliability. The catch diode is rated for 350mA typical valley current and includes internal current limiting for short-circuit protection.
How does the BD pin improve efficiency in LT3970EDDB#TRPBF designs?
The BD pin allows the LT3970EDDB#TRPBF to draw bias power from the regulated output (when BD > 3.2V) instead of VIN, reducing input current and improving light-load efficiency. This feature is especially valuable in fixed-output configurations like LT3970EDDB-3.3#TRPBF where VOUT can directly power the internal regulator.
What is the minimum recommended switching frequency for LT3970EDDB#TRPBF at 36VIN → 5VOUT?
For 36VIN → 5VOUT, the minimum recommended switching frequency is ~200kHz. At higher frequencies, minimum on-time constraints limit duty cycle and may cause dropout. The datasheet equation fSW(MAX) = (VOUT + VD) / [tON(MIN) × (VIN − VSW + VD)] confirms 200kHz ensures reliable operation across temperature and input variation for LT3970EDDB#TRPBF.
Is LT3970EDDB#TRPBF pin-compatible with other variants in the LT3970 family?
Yes, all LT3970 variants - including LT3970EDDB#TRPBF, LT3970EDDB-3.3#TRPBF, and LT3970IDDB#TRPBF - share identical 10-lead DFN (3mm × 2mm) pinout and footprint. The only differences are internal feedback configuration (adjustable vs fixed) and temperature grade (E-grade vs I-grade), allowing drop-in replacement in most designs.
LT3970EDDB#TRPBF 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:
- 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-DFN (3x2)
LT3970EDDB#TRPBF FAQ
1.How can I place an order for LT3970EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB#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 LT3970EDDB#TRPBF reliable?
The price and inventory of LT3970EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB#TRPBF?
LT3970EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB#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 LT3970EDDB#TRPBF?
For technical support, including LT3970EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB#TRPBF requirements.
6.How does Aetrix verify that LT3970EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB#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 LT3970EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB#TRPBF?
All LT3970EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB#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 LT3970EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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