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Analog Devices Inc. LT3970EDDB-3.3#TRMPBF
- Part No.:
- LT3970EDDB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,048
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Product details
Overview
LT3970EDDB-3.3#TRMPBF from Analog Devices is a 40V input, 350mA fixed-output buck regulator in a 3mm × 2mm DFN-10 package, featuring 2.5µA quiescent current, integrated boost and catch diodes, and a power good flag. It delivers stable 3.3V output for automotive battery regulation, portable power, and industrial supplies with low-ripple Burst Mode operation.
For engineers reviewing the LT3970EDDB-3.3#TRMPBF datasheet, LT3970EDDB-3.3#TRMPBF pinout, LT3970EDDB-3.3#TRMPBF application, or LT3970EDDB-3.3#TRMPBF equivalent, key selection criteria include its 3.3V fixed output accuracy (±1.2% over –40°C to 125°C), 200kHz–2.2MHz programmable switching frequency, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3970EDDB-3.3#TRMPBF implements constant-frequency current-mode control with internal compensation, enabling fast transient response and inherent loop stability. Its architecture integrates a bipolar NPN switch, boost diode, and catch Schottky diode - eliminating external components while supporting wide VIN (4.2V–40V) operation.
Burst Mode operation reduces quiescent current to 1.7µA at light loads while maintaining output ripple below 5mVP-P; the power good (PG) flag asserts when VOUT reaches 90% of nominal 3.3V, with 10mV hysteresis. An accurate 1V enable threshold and 0.7µA shutdown current support low-power system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 125°C - ensures stable logic supply without external feedback resistors. |
| Input Voltage Range | 4.2V to 40V - supports direct connection to 12V/24V automotive batteries and industrial rails. |
| Max Output Current | 350mA - limited by internal catch diode valley current, sufficient for microcontrollers and sensors. |
| Quiescent Current | 2.5µA at 12VIN → 3.3VOUT - enables always-on systems with multi-year battery life. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size and efficiency. |
| Package | 10-pin DFN (3mm × 2mm, exposed pad) - provides 76°C/W thermal resistance for compact high-density layouts. |
| Power Good Flag | Open-drain PG asserts at 90% of 3.3V (2.97V) with 10mV hysteresis - enables reliable system power sequencing. |
Pinout & Package
LT3970EDDB-3.3#TRMPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for thermal management. Pin 1 is FB/VOUT (fixed 3.3V output node), Pin 2 is EN (1V threshold enable), Pin 3 is VIN (4.2V–40V input), Pins 4 & 5 are GND, Pin 6 is SW (switch node), Pin 7 is BOOST (external bootstrap capacitor connection), Pin 8 is BD (bias diode anode), Pin 9 is PG (open-drain power good), and Pin 10 is RT (frequency-setting resistor to ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB/VOUT) | Fixed-output voltage node | Internally regulated to 3.3V; connects directly to output capacitor and load - no external divider required. |
| Pin 2 (EN) | Enable control input | Hysteretic 1V rising threshold; pulls device into 0.7µA shutdown when low - enables precise system-level power gating. |
| Pin 3 (VIN) | Main power input | Supplies internal circuitry and switch; requires local 1µF–4.7µF ceramic bypass - must be ≥4.2V to activate EN function. |
| Pins 4, 5, 11 (GND) | Ground reference and thermal path | Multiple GND pins + exposed pad reduce impedance and improve thermal dissipation - pad must be soldered to PCB ground plane. |
| Pin 6 (SW) | Switch node | Connects to inductor; carries pulsed current up to 700mA peak - layout requires short, low-inductance trace to minimize EMI. |
| Pin 7 (BOOST) | Bootstrap drive voltage | Requires external capacitor to generate >VIN voltage - enables full saturation of internal bipolar NPN switch for low VCESAT. |
| Pin 8 (BD) | Bias diode anode | Accepts external bias ≥3.2V (e.g., from VOUT) to power internal regulator - improves efficiency by reducing VIN current draw. |
| Pin 9 (PG) | Power good indicator | Open-drain output pulled high externally; asserts when VOUT ≥2.97V - used for processor reset or system enable sequencing. |
| Pin 10 (RT) | Frequency programming | Resistor to GND sets switching frequency from 200kHz to 2.2MHz - enables optimization of inductor size vs. efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external diodes - reduces BOM count, PCB area, and thermal stress in space-constrained designs. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA - critical for noise-sensitive analog and RF circuits. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to 125°C junction temperature - validated for automotive infotainment, ADAS sensors, and body electronics. |
| Internal current limiting | 350mA catch diode valley limit and 700mA switch peak limit - provides robust short-circuit protection without external sensing. |
| Accurate power good flag | 10mV hysteresis and 2.97V trip point - ensures deterministic system startup and avoids false resets during brown-out conditions. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery to clean 3.3V for MCU, CAN transceiver, and sensor interface in ADAS camera module. IC Role / Device Role / Timing Role: Primary step-down DC/DC converter providing isolated, low-noise 3.3V rail with power sequencing via PG flag. Use Value: AEC-Q100 qualification and 40V absolute max input withstand load dump transients; 2.5µA IQ extends parking mode battery life. |
Use Scenario: Powering ARM Cortex-M4 microcontroller and BLE radio in handheld medical diagnostic device operating from single Li-ion cell. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering stable 3.3V under variable battery voltage (3.0V–4.2V) and dynamic load profiles. Use Value: Burst Mode maintains <5mVP-P ripple during wireless transmission bursts while drawing only 1.7µA in sleep - extends runtime by >30%. |
| Industrial Sensor Node | Smart Building Control |
|
Use Scenario: Supplying 3.3V to MEMS accelerometer, temperature sensor, and LoRaWAN transceiver in battery-powered structural health monitor. IC Role / Device Role / Timing Role: Always-on power management IC enabling multi-year operation on primary lithium thionyl chloride battery. Use Value: 0.7µA shutdown current and accurate 1V EN threshold allow deep-sleep wake-up control; integrated diodes reduce component count by 2. |
Use Scenario: Powering occupancy sensor, Zigbee SoC, and IR LED array in wall-mounted smart thermostat with 24VAC HVAC interface. IC Role / Device Role / Timing Role: Input-stage buck converter accepting rectified 24VAC (up to 34VDC) and delivering regulated 3.3V for digital subsystem. Use Value: 40V input rating handles AC line surges; PG flag synchronizes firmware initialization with stable rail - prevents boot failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36503ADDA | 3.3V fixed, 650mA, 3V–65V input, 26µA IQ - higher current but 10× higher quiescent current. | Lacks AEC-Q100 qualification and integrated catch diode - requires external Schottky. | Select when >350mA load or >40V input is needed; avoid where ultra-low IQ or automotive compliance is mandatory. |
| TPS62840DLCR | 3.3V fixed, 600mA, 1.8V–6.5V input, 0.075µA IQ - lower IQ but incompatible input range. | Designed for single-cell Li-ion only; no 40V tolerance or automotive qualification. | Choose only for ultra-low-power portable devices with ≤6.5V input; not suitable for automotive or industrial 12V/24V systems. |
Compared with LMR36503ADDA and TPS62840DLCR, the LT3970EDDB-3.3#TRMPBF uniquely balances 40V input capability, AEC-Q100 qualification, 2.5µA IQ, and integrated diodes - making it optimal for automotive and industrial 3.3V point-of-load regulation where reliability and board space are critical.
Availability
LT3970EDDB-3.3#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and industrial sensor node applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3970EDDB-3.3#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 with precision power, signal chain, and RF solutions.
The LT3970 series is designed for high-input-voltage, low-quiescent-current DC/DC conversion in space-constrained and reliability-critical applications - emphasizing integration, efficiency, and automotive-grade robustness.
FAQ
What is the output voltage tolerance of the LT3970EDDB-3.3#TRMPBF over temperature?
The LT3970EDDB-3.3#TRMPBF delivers a fixed 3.3V output with ±1.2% tolerance over the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table. This tight regulation is achieved via internal trimming and does not require external feedback components. The LT3970EDDB-3.3#TRMPBF maintains this accuracy without drift beyond datasheet limits under steady-state conditions.
Does the LT3970EDDB-3.3#TRMPBF require external diodes?
No, the LT3970EDDB-3.3#TRMPBF integrates both the boost diode and catch Schottky diode on-die, eliminating the need for two external diodes typically required in buck converter designs. This integration reduces total solution size, component count, and potential failure points. The LT3970EDDB-3.3#TRMPBF achieves this while maintaining 350mA output capability and low forward voltage drop (<650mV at 100mA for the catch diode).
How does the power good (PG) flag behave on the LT3970EDDB-3.3#TRMPBF?
The LT3970EDDB-3.3#TRMPBF PG pin is an open-drain output that remains low until VOUT reaches 90% of its nominal 3.3V (i.e., 2.97V), then transitions high via external pull-up. It features 10mV hysteresis to prevent chatter near threshold. PG is valid only when VIN > 4.2V and EN is high. This behavior enables reliable system power sequencing in the LT3970EDDB-3.3#TRMPBF-based designs.
Can the LT3970EDDB-3.3#TRMPBF operate from a 5V input?
Yes, the LT3970EDDB-3.3#TRMPBF supports minimum input voltage of 4.2V, making 5V operation fully valid. At 5V input, the device delivers 3.3V output with typical efficiency >85% at 100mA load and maintains Burst Mode functionality down to µA-level loads. The LT3970EDDB-3.3#TRMPBF's internal current limits and thermal design ensure stable operation across this low-dropout condition.
Is the LT3970EDDB-3.3#TRMPBF pin-compatible with other variants in the LT3970 family?
Yes, the LT3970EDDB-3.3#TRMPBF shares identical 10-pin DFN (3mm × 2mm) packaging and pinout with all LT3970-3.3, -3.42, and -5 variants in the DDB package - including LT3970EDDB-3.42#TRMPBF and LT3970EDDB-5#TRMPBF. This allows direct substitution within the same output voltage family without PCB changes, provided thermal and layout constraints remain consistent for the LT3970EDDB-3.3#TRMPBF footprint.
LT3970EDDB-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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-DFN (3x2)
LT3970EDDB-3.3#TRMPBF FAQ
1.How can I place an order for LT3970EDDB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB-3.3#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-3.3#TRMPBF reliable?
The price and inventory of LT3970EDDB-3.3#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-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB-3.3#TRMPBF?
LT3970EDDB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB-3.3#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-3.3#TRMPBF?
For technical support, including LT3970EDDB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LT3970EDDB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB-3.3#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-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB-3.3#TRMPBF?
All LT3970EDDB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB-3.3#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-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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