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Analog Devices Inc. LT3470HDDB#TRMPBF
- Part No.:
- LT3470HDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470HDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,102
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Product details
Overview
LT3470HDDB#TRMPBF from Analog Devices is a micropower buck regulator IC with integrated boost and catch Schottky diodes, designed for automotive-grade DC/DC conversion. It delivers up to 200mA output current, operates from 4V to 40V input, regulates output from 1.25V to 16V, and maintains 26µA quiescent current at 12VIN/3.3VOUT. It is used in automotive battery regulation and industrial power supplies requiring AEC-Q100 compliance.
For engineers reviewing the LT3470HDDB#TRMPBF datasheet, LT3470HDDB#TRMPBF pinout, LT3470HDDB#TRMPBF application, or LT3470HDDB#TRMPBF equivalent, key selection criteria include its –40°C to 150°C operating range, hysteretic/Burst Mode control, 8-lead DFN (3mm × 2mm) thermally enhanced package, and integrated diode architecture eliminating external diodes in space-constrained designs.
Technical Context
The LT3470HDDB#TRMPBF uses a hysteretic control scheme with Burst Mode operation to minimize output ripple (<10mV) while maintaining ultra-low quiescent current (26µA typical). Its bipolar NPN power switch is driven via an internal boost circuit that elevates the BOOST pin voltage above VIN using an external 0.22µF capacitor and integrated Schottky diode.
It features dual current limiting (top limit 250–435mA, bottom limit 225mA), 500ns minimum off-time, and automatic transition between discontinuous (Burst Mode) and continuous conduction modes based on load. The FB pin is regulated to 1.25V with ±12mV tolerance over temperature, enabling precise output setting via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports 2-cell Li-ion, lead-acid, and unregulated wall adapters without external pre-regulation. |
| Output Current | 200mA - sufficient for powering microcontrollers, sensors, and interface ICs in automotive modules. |
| Quiescent Current | 26µA at 12VIN/3.3VOUT - enables multi-year battery life in always-on vehicle subsystems. |
| Shutdown Current | <1µA - fully disconnects load from input, simplifying low-power state management. |
| FB Reference Voltage | 1.25V ±12mV - sets output accuracy and stability across –40°C to 150°C operating range. |
| Operating Temperature | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood and engine-control applications. |
| Package | 8-lead DFN (3mm × 2mm, 0.75mm height) with exposed thermal pad - enables compact, thermally robust PCB layouts. |
Pinout & Package
LT3470HDDB#TRMPBF is housed in an 8-lead plastic DFN (DDB8) package measuring 3mm × 2mm × 0.75mm with an exposed ground pad (Pin 9) that must be soldered to the PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Shutdown enable input | Logic-high ≥2.5V enables regulation; grounded disables switching and reduces VIN current to <1µA. |
| NC (Pin 2) | No-connect terminal | May be left floating or tied to VIN; no internal connection or function. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and power switch; requires local 1–2.2µF ceramic bypass capacitor. |
| GND (Pin 4) | Power and signal ground | Reference for FB, SHDN, and BIAS; must connect to local ground plane and output capacitor ground. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; high dv/dt node requiring minimized trace area and tight layout. |
| BOOST (Pin 6) | Boost capacitor connection | Accepts charge from internal Schottky diode to generate >VIN gate drive for NPN switch saturation. |
| BIAS (Pin 7) | Bias supply input | Tied to VOUT if VOUT > 2V (improves efficiency); otherwise tied to VIN to power internal regulator. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; connects to resistor divider to set output voltage as VOUT = 1.25V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch Schottky diodes | Eliminates two external diodes, reducing solution size to ≤50mm² and improving reliability in automotive environments. |
| Hysteretic + Burst Mode control | Delivers <10mV output ripple at light loads while maintaining 26µA quiescent current-critical for always-on telematics modules. |
| AEC-Q100 Grade H qualification | Guaranteed operation from –40°C to +150°C junction temperature, supporting engine control unit (ECU) and transmission control applications. |
| Fast short-circuit protection | Hysteretic current limiting and 500ns minimum off-time prevent switch overstress during output shorts-even at 40V input. |
| Thermally enhanced DFN package | Exposed pad (Pin 9) provides low θJA = 180°C/W, enabling high ambient operation without heatsinks in confined enclosures. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rails to 3.3V or 5V for infotainment head units and ADAS camera modules. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated diodes and AEC-Q100 qualification for under-dash mounting. Use Value: Eliminates external diodes and reduces board area by >30% versus discrete solutions while meeting ISO 16750-2 pulse test requirements. |
Use Scenario: Providing isolated 5V/12V bias supplies for PLC I/O modules and factory automation sensors operating in harsh industrial environments. IC Role / Device Role / Timing Role: Micropower buck converter delivering stable output across wide input transients (4–40V) and extended temperature ranges. Use Value: 26µA quiescent current extends backup battery life; 150°C rating ensures reliability near motors and drives. |
| Wall Transformer Regulation | Portable Medical Device Power |
Use Scenario: Converting unregulated 9–36V AC/DC wall adapter outputs to clean 3.3V for embedded controllers in networked appliances. IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling line surges and brownouts without external LDO post-regulation. Use Value: Wide 4–40V input range accepts legacy and modern adapters; <10mV ripple avoids noise coupling into analog signal chains. |
Use Scenario: Powering portable ECG monitors and insulin pumps where battery runtime and safety-critical reliability are paramount. IC Role / Device Role / Timing Role: Primary power stage converting single Li-ion (3.0–4.2V) or dual-cell (6–8.4V) to regulated 1.8V/3.3V rails. Use Value: <1µA shutdown current prevents battery drain during standby; integrated diodes reduce component count and failure points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471EDDB#TRMPBF | Same architecture but rated for –40°C to 85°C; lower max junction temperature (125°C) and no AEC-Q100 qualification. | Suitable for commercial/industrial use only-not certified for automotive under-hood deployment. | Select when cost sensitivity outweighs temperature or automotive qualification requirements. |
| LMR14020SQDDARQ1 | 40V, 2A synchronous buck; higher current, MOSFET-based, no integrated catch diode; requires external bootstrap capacitor. | Targets higher-power systems (e.g., ADAS domain controllers); larger solution size and different control loop design. | Choose when >200mA output or synchronous efficiency (>90% at full load) is required-LT3470HDDB#TRMPBF is not a drop-in replacement. |
Compared with LT3470EDDB#TRMPBF and LMR14020SQDDARQ1, the LT3470HDDB#TRMPBF uniquely combines AEC-Q100 Grade H qualification, integrated diodes, and micropower operation in a 3mm × 2mm DFN-making it optimal for space- and temperature-constrained automotive subsystems where 200mA is sufficient.
Availability
LT3470HDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and wall transformer regulation requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LT3470HDDB#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 LT3470 product line delivers micropower, high-voltage buck regulators with integrated diodes for automotive and industrial applications where small size, low IQ, and AEC-Q100 compliance are essential.
FAQ
What is the maximum input voltage rating for the LT3470HDDB#TRMPBF?
The LT3470HDDB#TRMPBF has an absolute maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. For reliable long-term use, design margins should keep VIN ≤ 36V under transient conditions, especially in automotive environments with load dump events.
Does the LT3470HDDB#TRMPBF require external diodes?
No, the LT3470HDDB#TRMPBF integrates both the boost Schottky diode and catch Schottky diode internally. This eliminates the need for two external diodes, reducing bill-of-materials count, PCB area, and potential failure points-particularly valuable in AEC-Q100-compliant automotive designs.
What is the purpose of the BIAS pin on the LT3470HDDB#TRMPBF?
The BIAS pin on the LT3470HDDB#TRMPBF supplies current to the internal regulator. When VOUT > 2V, tie BIAS to VOUT to improve efficiency; otherwise, tie it to VIN. At VBIAS > 3V, the pin actively sources current to the internal circuitry, reducing quiescent draw from VIN.
How does the LT3470HDDB#TRMPBF achieve low output ripple?
The LT3470HDDB#TRMPBF achieves <10mV output ripple through hysteretic control combined with Burst Mode operation at light loads and continuous mode at higher loads. Its integrated diodes and optimized internal switch timing minimize switching noise, while a 22pF phase-lead capacitor from VOUT to FB further suppresses comparator delay-induced ripple.
Is the LT3470HDDB#TRMPBF pin-compatible with other LT3470 variants?
Yes, all LT3470 variants-including LT3470EDDB#TRMPBF, LT3470IDDB#TRMPBF, and LT3470HDDB#TRMPBF-share identical 8-lead DFN (DDB8) pinout and footprint. Only the temperature grade and qualification differ; no PCB layout changes are needed when upgrading from E/I to H grade for automotive use.
LT3470HDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 200mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3470HDDB#TRMPBF FAQ
1.How can I place an order for LT3470HDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470HDDB#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 LT3470HDDB#TRMPBF reliable?
The price and inventory of LT3470HDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470HDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470HDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470HDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470HDDB#TRMPBF?
LT3470HDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470HDDB#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 LT3470HDDB#TRMPBF?
For technical support, including LT3470HDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470HDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3470HDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470HDDB#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 LT3470HDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470HDDB#TRMPBF?
All LT3470HDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470HDDB#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 LT3470HDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470HDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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