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Analog Devices Inc. LT3470HDDB#TRPBF
- Part No.:
- LT3470HDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470HDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
LT3470HDDB#TRPBF 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 voltage from 1.25V to 16V via external feedback divider, and achieves <10mV output ripple in Burst Mode® operation - ideal for battery-powered automotive sensors and infotainment power rails.
For engineers reviewing the LT3470HDDB#TRPBF datasheet, LT3470HDDB#TRPBF pinout, LT3470HDDB#TRPBF application, or LT3470HDDB#TRPBF equivalent, this page provides verified thermal, electrical, and packaging details for AEC-Q100-compliant high-temperature design, including shutdown current (<1µA), quiescent current (26µA at 12VIN→3.3VOUT), and 8-lead DFN package with exposed ground pad.
Technical Context
The LT3470HDDB#TRPBF uses hysteretic mode control with dual current comparators and a one-shot timer to regulate switching frequency dynamically - eliminating external compensation while maintaining stability across load and input variations. Its bipolar NPN power switch is driven by an internal charge pump tied to the BOOST pin, enabling full saturation even at low VIN/VOUT ratios.
Burst Mode® operation engages below ~10mA load to reduce quiescent current to 26µA, while continuous conduction resumes above that threshold; fast current limiting (top limit: 250–435mA, bottom limit: 225mA) and 500ns minimum off-time provide robust short-circuit protection up to 40V input without external components.
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 maximum - sufficient for powering microcontrollers, CAN transceivers, and sensor signal chains 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 in ECU sleep modes. |
| FB Reference Voltage | 1.25V ±1.7% - sets precise output regulation via external resistor divider; line regulation 0.01%/V ensures stability across wide input range. |
| Operating Temperature | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood and transmission-control applications. |
| Output Ripple | <10mV peak-to-peak - achieved using small ceramic output capacitors and optional 22pF phase-lead capacitor on FB node. |
Pinout & Package
LT3470HDDB#TRPBF is housed in an 8-lead (3mm × 2mm) plastic DFN package with thermally enhanced exposed pad (Pin 9), which must be soldered to PCB ground for thermal and electrical performance. Package height is 0.75mm, suitable for space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Logic-high ≥2.5V enables regulation; grounded disables all circuitry 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 reference | Return path for feedback divider and internal circuits; must connect to local ground plane beneath exposed pad. |
| SW (Pin 5) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor; carries high dI/dt switching current. |
| BOOST (Pin 6) | Charge-pump drive node | Generates >VIN voltage to saturate bipolar switch; requires 0.22µF capacitor between BOOST and SW. |
| BIAS (Pin 7) | Bias supply selector | Tied to VOUT if >2V, else to VIN; supplies current to internal regulator when VBIAS >3V. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; sets output voltage as VOUT = 1.25V × (1 + R1/R2); bias current ≤225nA (H-grade). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diodes | Eliminates two external components (boost and catch diodes), reducing solution size to 50mm² and improving reliability in vibration-prone automotive environments. |
| Hysteretic control architecture | Enables stable operation without external compensation network or loop-stability analysis - simplifies design for non-expert power engineers. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with full parameter guarantees, meeting automotive safety-critical power requirements. |
| Burst Mode® low-ripple operation | Maintains <10mV output ripple at light loads while achieving 26µA quiescent current - critical for always-on telematics and ADAS sensors. |
| Thermally enhanced DFN package | Exposed pad (Pin 9) lowers θJA to 180°C/W, enabling 200mA output at +125°C ambient without heatsinking. |
Applications
| Automotive Battery Regulation | Power for Portable Products |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery rail to 3.3V or 5V for engine control unit (ECU) sub-circuits during cold-crank (6V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise power domain with fast transient response and overvoltage/overcurrent protection. Use Value: Withstands 40V input surges and maintains regulation down to 4V input, eliminating need for external TVS or pre-regulator stages in cost-sensitive modules. | Use Scenario: Powering handheld diagnostic tools and portable OBD-II scanners powered by single Li-ion cells or USB sources. IC Role / Device Role / Timing Role: Micropower step-down regulator enabling long runtime from compact batteries while supporting variable input (4–40V) from multiple source types. Use Value: 26µA quiescent current extends battery life beyond 3 years in standby; integrated diodes reduce BOM count and board area by 30% vs discrete solutions. |
| Distributed Supply Regulation | Industrial Supplies |
Use Scenario: Local point-of-load (POL) regulation on distributed I/O modules in commercial vehicle telematics systems with varying bus voltages. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage converting 24V chassis supply to 5V for isolated CAN FD transceivers and microcontroller peripherals. Use Value: 8-lead DFN package fits tight spacing constraints; AEC-Q100 qualification ensures interoperability with automotive-grade communication stacks. | Use Scenario: Providing regulated 3.3V/5V rails in industrial gateways deployed in harsh environments (e.g., fleet management base stations). IC Role / Device Role / Timing Role: High-reliability buck regulator handling wide-input industrial supplies (18–40V) with minimal external components and no thermal derating up to +125°C. Use Value: Guaranteed –40°C to +150°C operation eliminates need for thermal monitoring or derating logic; <10mV ripple meets EMC requirements for sensitive analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471EDDB#TRPBF | Same architecture but rated for –40°C to +85°C (E-grade); lower max junction temperature (125°C) and higher quiescent current (35µA typical). | Not qualified for under-hood use; suitable only for cabin-mounted infotainment or body-control modules. | Select LT3471EDDB#TRPBF only if ambient temperature remains below 85°C and AEC-Q100 compliance is not required. |
| LMR14020SQDDARQ1 | 40V, 2A synchronous buck; higher current capability but larger solution size, no integrated catch diode, and 40µA quiescent current. | Designed for higher-power automotive loads (e.g., camera modules); lacks Burst Mode® for ultra-low-IQ operation. | Choose LMR14020SQDDARQ1 when >200mA output or synchronous efficiency is needed, accepting larger footprint and higher standby consumption. |
Compared with LT3470HDDB#TRPBF, LT3471EDDB#TRPBF offers identical functionality at lower temperature grade and cost, while LMR14020SQDDARQ1 trades micropower operation for higher output current and synchronous rectification - making LT3470HDDB#TRPBF optimal for space- and power-constrained automotive sensor nodes.
Availability
LT3470HDDB#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, distributed supply regulation, and industrial supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3470HDDB#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 automotive, industrial, and communications markets with precision power, sensing, and interface solutions.
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 mandatory design requirements.
FAQ
What is the maximum input voltage rating for LT3470HDDB#TRPBF?
The absolute maximum input voltage for LT3470HDDB#TRPBF is 40V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. The device is designed to handle automotive load-dump transients up to 40V without external clamping, provided proper input capacitance and layout practices are followed per the datasheet recommendations.
Does LT3470HDDB#TRPBF require external diodes for boost or catch functions?
No, LT3470HDDB#TRPBF integrates both the boost Schottky diode and catch Schottky diode internally. This eliminates two external components, reduces solution size to as small as 50mm², and improves reliability in automotive vibration environments - a key differentiator versus discrete or controller-based buck solutions.
What is the guaranteed operating temperature range for LT3470HDDB#TRPBF?
LT3470HDDB#TRPBF is guaranteed to operate from –40°C to +150°C ambient temperature and is qualified per AEC-Q100 Grade H. All electrical specifications - including quiescent current, FB reference voltage, and current limits - are fully characterized and warranted across this full range, making it suitable for under-hood and transmission-control applications.
How does LT3470HDDB#TRPBF achieve low output ripple in Burst Mode® operation?
LT3470HDDB#TRPBF achieves <10mV peak-to-peak output ripple in Burst Mode® through hysteretic control with precise top/bottom current limits and optimized switching timing. Combined with a small 22pF phase-lead capacitor on the FB node and low-ESR output capacitors, it maintains tight regulation while drawing only 26µA quiescent current at light loads.
Is the exposed pad on LT3470HDDB#TRPBF electrically connected, and how should it be handled?
Yes, the exposed pad (Pin 9) of LT3470HDDB#TRPBF is electrically connected to GND and must be soldered to a solid PCB ground plane. This connection is mandatory for thermal dissipation (θJA = 180°C/W) and electrical stability. Failure to solder the pad results in excessive junction temperature rise and potential functional failure under load.
LT3470HDDB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3470HDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470HDDB#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 LT3470HDDB#TRPBF reliable?
The price and inventory of LT3470HDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470HDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3470HDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470HDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470HDDB#TRPBF?
LT3470HDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470HDDB#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 LT3470HDDB#TRPBF?
For technical support, including LT3470HDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470HDDB#TRPBF requirements.
6.How does Aetrix verify that LT3470HDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3470HDDB#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 LT3470HDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3470HDDB#TRPBF?
All LT3470HDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470HDDB#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 LT3470HDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3470HDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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