My Inquiry
My Account
Analog Devices Inc. LT3970EDDB-5#TRPBF
- Part No.:
- LT3970EDDB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3970EDDB-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,501
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3970EDDB-5#TRPBF from Analog Devices is a 40V input, 5V fixed-output monolithic buck switching regulator in a 3mm × 2mm DFN-10 package, featuring 2.5µA quiescent current, integrated boost and catch diodes, 350mA output current, and low-ripple Burst Mode operation for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3970EDDB-5#TRPBF datasheet, LT3970EDDB-5#TRPBF pinout, LT3970EDDB-5#TRPBF application, or LT3970EDDB-5#TRPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and electrical behavior across –40°C to 125°C, and real-world substitution guidance for industrial and automotive DC/DC design.
Technical Context
The LT3970EDDB-5#TRPBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) via external RT resistor, enabling precise trade-offs between efficiency, inductor size, and input voltage range. Its internal bipolar NPN switch is driven by a BOOST pin circuit that sustains saturation under high VIN/VOUT ratios.
Burst Mode operation reduces quiescent current to 1.7µA at light loads while maintaining output ripple below 5mVP-P; a dedicated open-drain Power Good (PG) flag asserts when VOUT reaches 90% of 5V, and an accurate 1V EN threshold enables reliable shutdown control with 0.7µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% over –40°C to 125°C; eliminates external feedback resistors and simplifies layout for stable 5V rail generation. |
| Input Voltage Range | 4.2V to 40V operating; supports wide automotive battery transients and industrial unregulated supplies without external pre-regulation. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; enables always-on systems like telematics and sensor nodes with multi-year battery life. |
| Max Output Current | 350mA continuous; limited by internal catch diode valley current (400mA typ), not switch peak current, ensuring safe operation under short-circuit conditions. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin; allows optimization for EMI compliance, inductor size (e.g., 22µH at 600kHz), or minimum dropout at high VIN. |
| Package | 10-pin (3mm × 2mm) DFN with exposed thermal pad; achieves θJA = 76°C/W, supporting 350mA output without forced air in compact PCB footprints. |
| Power Good Threshold | 90% of 5V (i.e., 4.5V) with 12mV hysteresis; provides clean system reset signaling compatible with microcontroller POR requirements. |
Pinout & Package
LT3970EDDB-5#TRPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for thermal management. Pin numbering follows top-view orientation per Analog Devices DDB package drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB/VOUT) | Fixed-output feedback node | Internally connected to 5V regulation divider; no external resistor required-simplifies BOM and improves accuracy vs. adjustable variants. |
| Pin 2 (EN) | Enable control input | Hysteretic 1V rising threshold; pulls device into 0.7µA shutdown when low-enables system-level power sequencing and wake-up control. |
| Pin 3 (VIN) | Main power input | Supplies internal bias and switch driver; must be locally bypassed with ≥1µF X7R ceramic capacitor to suppress high-di/dt noise. |
| Pins 4, 5, 11 (GND) | Ground reference and thermal path | Three GND connections including exposed pad; mandatory soldering ensures thermal integrity and low-noise return path for switch node. |
| Pin 6 (SW) | Switch node output | Drives external inductor; carries high di/dt square wave-requires tight loop layout with minimal trace length to reduce EMI. |
| Pin 7 (BOOST) | Bootstrap drive supply | Requires external capacitor to generate >VIN voltage; enables full saturation of internal bipolar NPN switch for low VCESAT (175mV @ 200mA). |
| Pin 8 (BD) | Boost diode anode connection | Accepts external boost diode anode or connects to regulated VOUT (>3.2V) to improve efficiency by powering internal bias from output rail. |
| Pin 9 (PG) | Open-drain power good flag | Sinks current when VOUT < 4.5V; requires external pull-up to monitor 5V rail stability during startup and fault conditions. |
| Pin 10 (RT) | Frequency programming input | Resistor-to-ground sets switching frequency (e.g., 226kΩ = 600kHz); enables EMI tuning and component size optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Ripple Burst Mode® | Maintains <5mVP-P output ripple at light loads while reducing IQ to 1.7µA-critical for noise-sensitive analog sensors and RF modules. |
| Integrated Diodes | On-die boost and catch Schottky diodes eliminate two external components, reduce board area by ~15mm², and improve reliability vs. discrete solutions. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E, –40°C to 125°C junction); includes production flow controls and reliability testing per automotive standards. |
| Internal Compensation | Eliminates external compensation network-reduces design cycle time and eliminates tuning errors in production across temperature and load. |
| Catch Diode Current Limit | Valley-current foldback protects against sustained short-circuit faults without latch-off, enabling self-recovery in automotive infotainment power rails. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V for CAN transceivers and body control modules during cold-crank (4.2V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled 5V rail with Power Good signaling for MCU reset coordination. Use Value: 40V absolute max rating and 2.5µA IQ enable direct battery connection without pre-regulator, reducing BOM cost and improving cold-crank survival. |
Use Scenario: Powering handheld medical monitors and IoT edge devices from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (3–6V) sources requiring ultra-low standby drain. IC Role / Device Role / Timing Role: Efficient step-down regulator delivering 5V USB-compatible rail with Burst Mode enabling multi-year battery life in sleep states. Use Value: 1.7µA light-load IQ and integrated diodes extend runtime >30% vs. discrete buck solutions while occupying <6mm² PCB area. |
| Industrial Sensor Node Supply | Embedded Control Module |
Use Scenario: Generating clean 5V for precision ADCs, temperature sensors, and wireless SoCs in factory automation nodes powered from 24V DC bus with high EMI immunity requirements. IC Role / Device Role / Timing Role: Low-noise DC/DC converter with fixed 5V output and <5mVP-P ripple ensuring sub-LSB ADC accuracy and stable RF transmission. Use Value: Integrated compensation and current-mode control deliver fast transient response (<10µs) to sensor sampling bursts without output droop. |
Use Scenario: Providing regulated 5V for microcontrollers, display drivers, and EEPROM in programmable logic controllers (PLCs) operating continuously in 0°C–70°C enclosures. IC Role / Device Role / Timing Role: Robust primary power stage with thermal shutdown protection and PG flag for system health monitoring and graceful firmware recovery. Use Value: Exposed-pad DFN package and 76°C/W θJA allow 350mA output at 70°C ambient without heatsink-reducing thermal design complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8E#TRPBF | 42V input, 5V fixed, 2A output, 2.5µA IQ, Silent Switcher® architecture; larger 8-lead SOIC-EP package (5mm × 6mm). | Supports higher load currents (2A vs. 350mA) and lower EMI, but requires more PCB area and lacks AEC-Q100 qualification in this variant. | Select when >500mA load or stringent CISPR 25 Class 5 EMI compliance is required; avoid if space-constrained or automotive-qualified status is mandatory. |
| TPS62865ARGRR | 6V input max, 5V fixed, 4A output, 1.5µA IQ, 2.25MHz switching; 12-pin 2mm × 3mm WQFN package with PMBus interface. | Digital interface enables dynamic voltage scaling and telemetry, but incompatible with 12V/24V automotive inputs due to 6V VIN limit. | Select for battery-powered systems needing telemetry and >1A loads; reject for automotive or industrial 24V+ applications due to input voltage limitation. |
Compared with LT3970EDDB-5#TRPBF, LT8609SIS8E#TRPBF offers higher current and lower EMI at the cost of size and automotive qualification, while TPS62865ARGRR provides digital control and higher current but cannot operate from automotive battery rails-making LT3970EDDB-5#TRPBF the optimal choice for space-constrained, AEC-Q100-compliant 350mA 5V regulation.
Availability
LT3970EDDB-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, industrial sensor node supply, and embedded control module applications requiring stable component supply with guaranteed long-term availability.
Supply support for LT3970EDDB-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 with precision power, sensing, and signal chain solutions.
The LT3970 series was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in automotive and industrial environments-emphasizing robustness, integration, and extended temperature operation without external compensation.
FAQ
What is the output voltage tolerance of the LT3970EDDB-5#TRPBF over temperature?
The LT3970EDDB-5#TRPBF delivers a fixed 5V output with ±1% tolerance over the full –40°C to 125°C operating junction temperature range, as verified in the Electrical Characteristics table (typical 4.94V to 5.06V at –40°C to 125°C). This tight regulation is achieved through laser-trimmed internal feedback resistors and is independent of external component drift.
Does the LT3970EDDB-5#TRPBF require external diodes?
No, the LT3970EDDB-5#TRPBF integrates both the boost diode and catch Schottky diode on-die, eliminating the need for external diodes. This integration reduces component count, PCB area, and potential failure points-confirmed in the Features section and Block Diagram of the datasheet.
How does the Power Good (PG) pin function on the LT3970EDDB-5#TRPBF?
The PG pin on the LT3970EDDB-5#TRPBF is an open-drain output that remains low until VOUT reaches 90% of its nominal 5V value (i.e., 4.5V), then transitions high via external pull-up. It is valid only when EN is high and VIN exceeds 4.2V, providing precise rail-monitoring capability for system reset sequencing.
What is the minimum input voltage required for the LT3970EDDB-5#TRPBF to regulate 5V output?
The LT3970EDDB-5#TRPBF requires a minimum input voltage of 4.2V to operate, as specified in Absolute Maximum Ratings and Electrical Characteristics. At 5V output, practical minimum VIN is ~5.7V (accounting for diode drop and switch VCESAT), confirmed by Typical Performance curves showing stable regulation down to 6V input in 5V applications.
Is the LT3970EDDB-5#TRPBF pin-compatible with other LT3970 variants?
Yes, the LT3970EDDB-5#TRPBF shares identical pinout and package (10-lead DFN, 3mm × 2mm) with all LT3970-x DDB variants (e.g., LT3970EDDB-3.3#TRPBF), enabling drop-in replacement across fixed-output versions without PCB layout changes-verified in the Pin Configuration diagrams and Order Information tables.
LT3970EDDB-5#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:
- 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-DFN (3x2)
LT3970EDDB-5#TRPBF FAQ
1.How can I place an order for LT3970EDDB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970EDDB-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 LT3970EDDB-5#TRPBF reliable?
The price and inventory of LT3970EDDB-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 LT3970EDDB-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970EDDB-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970EDDB-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970EDDB-5#TRPBF?
LT3970EDDB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970EDDB-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 LT3970EDDB-5#TRPBF?
For technical support, including LT3970EDDB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970EDDB-5#TRPBF requirements.
6.How does Aetrix verify that LT3970EDDB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970EDDB-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 LT3970EDDB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970EDDB-5#TRPBF?
All LT3970EDDB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970EDDB-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 LT3970EDDB-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3970EDDB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3970EDDB-5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
