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Analog Devices Inc. LT3970EDDB#TRMPBF
- Part No.:
- LT3970EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,850
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Product details
Overview
LT3970EDDB#TRMPBF from Analog Devices is a 40V input, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current, and adjustable switching frequency from 200kHz to 2.2MHz. It delivers regulated 5V output in automotive battery regulation and portable power applications.
For engineers reviewing the LT3970EDDB#TRMPBF datasheet, LT3970EDDB#TRMPBF pinout, LT3970EDDB#TRMPBF application, or LT3970EDDB#TRMPBF equivalent, key selection criteria include its 3mm × 2mm DFN package, 1.21V feedback reference, power good flag, low-ripple Burst Mode operation, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970EDDB#TRMPBF implements constant-frequency current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior across wide input (4.2V–40V) and output (1.21V–25V) ranges. Its bipolar NPN switch is driven via an external BOOST capacitor to ensure full saturation.
Burst Mode operation reduces quiescent current to 1.7µA at light loads while maintaining output ripple below 5mVP-P; the catch diode current limit (350mA typical) and switch current limit (535mA min) jointly constrain maximum deliverable load current under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 40V - supports direct connection to 12V/24V/36V automotive and industrial rails 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 multi-year battery life in always-on sensor nodes |
| Switching Frequency | 200kHz to 2.2MHz - set externally via RT resistor; higher frequencies allow smaller magnetics but reduce max duty cycle |
| Feedback Reference | 1.21V ±1.2% over –40°C to 125°C - enables precise output programming with standard 1% resistors |
| Power Good Threshold | 90% of regulated output - open-drain PG flag asserts after soft-start completes and output settles within tolerance |
| Shutdown Current | 0.7µA - achieved when EN pin is pulled low; critical for zero-power standby modes |
Pinout & Package
LT3970EDDB#TRMPBF is housed in a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for thermal management. θJA = 76°C/W.
| 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 threshold (1.0V rising / 0.97V falling); accurate only when VIN ≥ 4.2V |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF) |
| GND (Pins 4, 5, 11) | Ground reference | Multiple GND pins and exposed pad minimize ground impedance and improve thermal dissipation |
| SW (Pin 6) | Switch node | Connects directly to inductor; carries high di/dt switching current; layout critical for EMI control |
| BOOST (Pin 7) | Bootstrap drive | Drives internal NPN switch; requires external capacitor between BOOST and SW |
| BD (Pin 8) | Boost diode anode | Accepts external boost diode anode; also powers internal bias regulator if >3.2V |
| PG (Pin 9) | Power good flag | Open-drain output; pulled low until FB reaches 90% of target; valid only when EN = high and VIN ≥ 4.2V |
| RT (Pin 10) | Frequency setting | Resistor to ground sets switching frequency; values from 42.2kΩ (2.2MHz) to 768kΩ (200kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode® operation | Maintains <5mVP-P output ripple at light loads while reducing IQ to 1.7µA - eliminates need for external LDO post-regulation in ultra-low-power systems |
| Integrated boost and catch diodes | Eliminates two external components and associated board space; catch diode valley current limit provides inherent short-circuit protection |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature - validated for automotive battery regulation without derating |
| Accurate 1V enable threshold with hysteresis | EN rising threshold = 1.00V ±60mV; hysteresis = 30mV - ensures clean startup/shutdown without oscillation near threshold |
| Internal compensation | Reduces design complexity and BOM count; no external compensation network required for stable operation with standard output capacitors |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 5V for infotainment USB ports and telematics modules. IC Role / Device Role / Timing Role: Primary buck converter delivering 350mA at 5V with AEC-Q100 compliance and cold-crank immunity down to 4.2V. Use Value: 2.5µA quiescent current prevents battery drain during vehicle sleep mode; PG flag enables safe system boot sequencing. |
Use Scenario: Powering GPS trackers and wireless sensors in battery-operated IoT edge devices. IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode to extend coin-cell or Li-SOCl₂ battery life beyond 5 years. Use Value: Sub-2µA shutdown current and 1.7µA light-load IQ minimize self-discharge; small DFN package fits constrained PCB footprints. |
| Industrial Sensor Node Supply | Medical Portable Equipment |
Use Scenario: Providing isolated 3.3V/5V rails for analog front-ends and microcontrollers in factory-floor condition monitors. IC Role / Device Role / Timing Role: Robust DC/DC stage handling 40V transients from inductive loads and long cable runs. Use Value: 40V absolute max input rating and integrated diodes withstand IEC 61000-4-4 burst events; thermal pad ensures reliability at 85°C ambient. |
Use Scenario: Powering handheld diagnostic tools requiring low-noise, stable 5V supply for precision ADCs and displays. IC Role / Device Role / Timing Role: Low-ripple primary regulator with <5mVP-P output noise in Burst Mode, avoiding audible ceramic capacitor squeal. Use Value: Integrated current-mode control and internal compensation yield consistent transient response across production units without tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#TRPBF | 42V input, 2.5A output, 2.5µA IQ, synchronous rectification, 3mm × 4mm LQFN | Higher current capability and synchronous architecture improve efficiency above 200mA; larger footprint | Select when >350mA load or >92% efficiency at mid-load is required; not pin-compatible |
| TPS62840DLCR | 6V input max, 1A output, 0.075µA IQ, 1.8mm × 1.6mm DSBGA | Ultra-low IQ ideal for energy harvesting; incompatible with >6V inputs or automotive transients | Select for sub-100mA battery-powered wearables where size and IQ dominate; cannot replace LT3970EDDB#TRMPBF in 12V+ systems |
Compared with LT8609SIV#TRPBF and TPS62840DLCR, the LT3970EDDB#TRMPBF uniquely balances 40V operation, 350mA output, sub-3µA IQ, and AEC-Q100 qualification in a 3mm × 2mm DFN - making it optimal for space-constrained automotive and industrial 5V/3.3V point-of-load designs where input voltage exceeds 6V.
Availability
LT3970EDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and industrial sensor node supply requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT3970EDDB#TRMPBF 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 automotive and harsh-environment applications - emphasizing robustness, precision regulation, and minimal external component count.
FAQ
What is the minimum input voltage required for LT3970EDDB#TRMPBF to regulate a 5V output?
The LT3970EDDB#TRMPBF requires a minimum input voltage of 4.2V to operate, but achieving regulation at 5V output depends on switching frequency and duty cycle limits. At 600kHz, the practical minimum VIN is approximately 5.8V due to minimum off-time constraints; lower frequencies extend dropout capability. The datasheet specifies 4.2V as the absolute minimum operating voltage, not the dropout voltage.
Does LT3970EDDB#TRMPBF require an external catch diode?
No, the LT3970EDDB#TRMPBF integrates both the power switch and the catch Schottky diode on-die. Pin BD connects to the anode of this internal diode, eliminating the need for an external discrete diode and reducing BOM count and PCB area. This integration also enables valley-current limiting for short-circuit protection.
How does the power good (PG) flag behave during startup and fault conditions for LT3970EDDB#TRMPBF?
The PG pin of LT3970EDDB#TRMPBF is an open-drain output that remains low until the FB pin reaches 90% of its regulated voltage (e.g., 1.089V for a 1.21V reference). It stays low during undervoltage lockout, EN pin deactivation, or output short circuits. PG is only valid when VIN ≥ 4.2V and EN is high - it does not assert during brown-out or thermal shutdown.
Can LT3970EDDB#TRMPBF be used with a fixed 5V output without external resistors?
No - the LT3970EDDB#TRMPBF is the adjustable version of the LT3970 family and requires an external resistor divider from VOUT to FB to set output voltage. Fixed-output variants like LT3970EDDB-5#TRMPBF have internal feedback networks and do not use the FB pin. Using LT3970EDDB#TRMPBF for 5V requires R1 = 15.15MΩ and R2 = 4.85MΩ (1% tolerance).
What thermal considerations apply to LT3970EDDB#TRMPBF in continuous 350mA operation?
In continuous 350mA operation at 12VIN/5VOUT, LT3970EDDB#TRMPBF dissipates ~150mW. With θJA = 76°C/W and 25°C ambient, junction temperature rises ~11°C - well within the –40°C to +125°C operating range. Full thermal performance requires soldering the exposed pad (Pin 11) to a ≥100mm² copper pour; insufficient grounding raises θJA and risks thermal shutdown.
LT3970EDDB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT3970EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT3970EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB#TRMPBF?
LT3970EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB#TRMPBF 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#TRMPBF?
For technical support, including LT3970EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3970EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB#TRMPBF?
All LT3970EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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