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Analog Devices Inc. LT3470EDDB#TRMPBF
- Part No.:
- LT3470EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470EDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
LT3470EDDB#TRMPBF from Analog Devices is a micropower buck regulator IC with integrated 300mA bipolar NPN switch, catch diode, and boost Schottky diode in an 8-lead 3mm × 2mm DFN package. It delivers up to 200mA at output voltages adjustable from 1.25V to 16V, operates from 4V to 40V input, and achieves <10mV output ripple using Burst Mode® and hysteretic control - ideal for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3470EDDB#TRMPBF datasheet, LT3470EDDB#TRMPBF pinout, LT3470EDDB#TRMPBF application, or LT3470EDDB#TRMPBF equivalent, key selection criteria include its 26µA quiescent current at 12VIN/3.3VOUT, AEC-Q100 qualification (E-grade, –40°C to 85°C), integrated diodes eliminating external components, and thermal performance enabled by exposed-pad DFN packaging.
Technical Context
The LT3470EDDB#TRMPBF employs a hysteretic control architecture with dual current comparators and an RS latch to regulate switching based on inductor current thresholds - enabling automatic transition between Burst Mode® (low-load, low-ripple micropower operation) and continuous conduction mode (higher loads). Its internal bipolar NPN switch requires boosted gate drive, supplied via an external BOOST capacitor and integrated Schottky diode.
Feedback is implemented through a precision 1.25V reference comparator monitoring the FB pin; output voltage is set externally via resistor divider (VOUT = 1.25V × (1 + R1/R2)). Shutdown is controlled by a logic-level SHDN pin (2.5V high threshold), reducing VIN current to <1µA, and the BIAS pin supports efficient biasing from VOUT when >2V or from VIN otherwise.
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. |
| Quiescent Current | 26µA at 12VIN/3.3VOUT - enables multi-year battery life in always-on sensor nodes. |
| Output Current | 200mA max - sufficient for powering microcontrollers, sensors, and RF modules in compact systems. |
| Output Ripple | <10mV peak-to-peak - achieved via Burst Mode® and optimized LC filtering, critical for noise-sensitive analog circuits. |
| Shutdown Current | <1µA - fully isolates load from input, simplifying power sequencing in battery-backed systems. |
| FB Reference Voltage | 1.250V ±1.7% - enables precise, resistor-programmable output from 1.25V to 16V with minimal external components. |
| Package | 8-lead 3mm × 2mm DFN (DD8) with exposed thermal pad - provides 180°C/W θJA and supports high-density PCB layouts. |
Pinout & Package
LT3470EDDB#TRMPBF uses the 8-lead DDB8 (3mm × 2mm plastic DFN) package with exposed ground pad (Pin 9), requiring soldering to PCB for thermal and electrical integrity. Thermal resistance is θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Logic-high ≥2.5V enables regulation; grounded disables all circuitry, reducing 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; must be locally bypassed with 1–2.2µF ceramic capacitor. |
| GND (Pin 4) | Power and signal ground | Reference for FB, SHDN, and internal circuits; must connect to local ground plane and feedback divider return. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; connects to BOOST capacitor; carries high di/dt switching current. |
| BOOST (Pin 6) | Boost capacitor connection | Provides >VIN drive voltage to internal NPN switch via external 0.22µF capacitor; must exceed SW by >2.5V for full saturation. |
| BIAS (Pin 7) | Bias supply input | Tied to VOUT if >2V (reducing quiescent current); otherwise tied to VIN; supplies internal regulator when >3V. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; sets output via external resistor divider; bias current flows out (35–225nA depending on grade). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates two external Schottky diodes, reducing solution size to as small as 50mm² and improving reliability. |
| Hysteretic mode control | Enables automatic load-dependent switching frequency adjustment - avoids subharmonic oscillation and simplifies loop compensation. |
| Burst Mode® operation | Maintains <10mV output ripple at light loads while holding quiescent current to 26µA, extending battery runtime. |
| AEC-Q100 qualification | E-grade rating (–40°C to 85°C) confirms suitability for automotive infotainment, body electronics, and ADAS power rails. |
| Fast short-circuit protection | Hysteretic current limiting and minimum off-time enforcement protect switch and inductor during output faults, even at 40V input. |
Applications
| Automotive Battery Regulation | Portable Medical Sensors |
|---|---|
Use Scenario: Regulating 12V automotive battery (8V–16V cranking range) to stable 3.3V for CAN transceivers and microcontrollers. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator providing isolated, low-noise power with fast transient response to engine start-stop events. Use Value: AEC-Q100 qualification ensures operational reliability across temperature extremes; 40V abs max rating withstands load-dump transients. | Use Scenario: Powering wearable ECG and SpO₂ sensors from coin-cell or Li-poly batteries with multi-week runtime requirements. IC Role / Device Role / Timing Role: Micropower buck converter delivering regulated 2.5V/3.3V while maintaining ultra-low standby current during sleep cycles. Use Value: 26µA quiescent current and <1µA shutdown enable years of operation on a single CR2032 cell; integrated diodes reduce bill-of-materials count. |
| Distributed Industrial I/O Power | Wall Adapter-Fed IoT Gateways |
Use Scenario: Generating local 5V rails for isolated analog front-ends and digital isolators in PLC modules powered from 24V DC bus. IC Role / Device Role / Timing Role: Compact, thermally robust point-of-load regulator minimizing heat buildup in densely packed DIN-rail enclosures. Use Value: Exposed-pad DFN package and 180°C/W θJA allow reliable 200mA operation without heatsinks; wide 4V–40V input accommodates brownout conditions. | Use Scenario: Converting unregulated 9–24V wall adapter output to clean 3.3V for Wi-Fi/BLE SoCs and flash memory in smart home hubs. IC Role / Device Role / Timing Role: Primary DC/DC regulator handling variable input and dynamic load steps from network activity bursts. Use Value: Burst Mode® ensures low ripple during data transmission while minimizing no-load losses; integrated diodes simplify compliance with space-constrained safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8606IMSE#TRPBF | Synchronous 2.5A buck with 2.5µA IQ; requires external MOSFETs; no integrated diodes; 3.4V–42V input. | Higher current, lower IQ, but larger solution size and higher BOM cost due to external FETs and diodes. | Select when >200mA output or <2.5µA IQ is mandatory; not drop-in due to different topology and pinout. |
| TPS62840DGFR | 2.5V–6.5V input; 1.8µA IQ; 1A output; synchronous; no integrated diodes; 2mm × 2mm WSON. | Lower input range limits use with 12V/24V sources; lacks AEC-Q100 and 40V rating; smaller package but no exposed thermal pad. | Prefer for ultra-low-power sub-6.5V battery systems; unsuitable for automotive or wide-input industrial use. |
Compared with LT8606IMSE#TRPBF and TPS62840DGFR, the LT3470EDDB#TRMPBF uniquely combines AEC-Q100 qualification, 40V absolute maximum input, integrated diodes, and 26µA quiescent current in a thermally enhanced DFN - making it optimal for space-constrained, wide-input, automotive-qualified buck applications where simplicity and ruggedness outweigh raw current capability.
Availability
LT3470EDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical sensors, and distributed industrial I/O requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3470EDDB#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, wide-input buck regulators with integrated power devices for space- and efficiency-critical applications in automotive, portable, and industrial power systems.
FAQ
What is the operating temperature range for the LT3470EDDB#TRMPBF?
The LT3470EDDB#TRMPBF is rated for –40°C to +85°C ambient operating temperature (E-grade), with guaranteed performance over this range per Analog Devices' characterization and statistical process controls. Its AEC-Q100 qualification confirms suitability for automotive under-hood and cabin environments where thermal stability is critical. The LT3470EDDB#TRMPBF uses a thermally enhanced DFN package with exposed ground pad to maintain junction temperatures within safe limits under 200mA load.
Does the LT3470EDDB#TRMPBF require external diodes?
No, the LT3470EDDB#TRMPBF integrates both the catch Schottky diode and the boost Schottky diode internally - eliminating the need for two external diodes typically required in discrete buck designs. This integration reduces total solution size to as small as 50mm², improves reliability by removing solder joints and component failure modes, and simplifies layout by removing high-current diode routing paths. The LT3470EDDB#TRMPBF still requires an external BOOST capacitor (typically 0.22µF) and output/input capacitors.
How does the LT3470EDDB#TRMPBF achieve low output ripple at light loads?
The LT3470EDDB#TRMPBF achieves <10mV output ripple at light loads using Burst Mode® operation - a proprietary technique that alternates between micropower standby and short, controlled switching bursts to replenish output capacitor charge. During each burst, hysteretic control ensures precise energy delivery, minimizing overshoot and undershoot. Combined with low-ESR output capacitors and optional 22pF phase-lead compensation from VOUT to FB, the LT3470EDDB#TRMPBF maintains tight regulation without complex external compensation networks.
Can the LT3470EDDB#TRMPBF be used with input voltages above 24V?
Yes, the LT3470EDDB#TRMPBF supports input voltages from 4V to 40V, making it suitable for 24V industrial buses, 36V lead-acid systems, and automotive load-dump scenarios. Its absolute maximum VIN rating is 40V, and internal fast current limiting plus hysteretic control provide inherent short-circuit protection even at 40V input. For reliable operation at high VIN, Analog Devices recommends using ≥33µH inductors with ≥450mA saturation current to ensure safe switch current limiting and thermal management in the LT3470EDDB#TRMPBF.
What is the purpose of the BIAS pin on the LT3470EDDB#TRMPBF?
The BIAS pin on the LT3470EDDB#TRMPBF provides an auxiliary power path for the internal regulator - improving efficiency and reducing quiescent current. When VOUT > 2V, BIAS should be connected to VOUT; otherwise, tie to VIN. When BIAS voltage exceeds 3V, it supplies current to the internal regulator, lowering total system IQ. This feature allows the LT3470EDDB#TRMPBF to achieve just 26µA quiescent current at 12VIN/3.3VOUT, significantly extending battery life compared to regulators without bias optimization.
LT3470EDDB#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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3470EDDB#TRMPBF FAQ
1.How can I place an order for LT3470EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470EDDB#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 LT3470EDDB#TRMPBF reliable?
The price and inventory of LT3470EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470EDDB#TRMPBF?
LT3470EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470EDDB#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 LT3470EDDB#TRMPBF?
For technical support, including LT3470EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3470EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470EDDB#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 LT3470EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470EDDB#TRMPBF?
All LT3470EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470EDDB#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 LT3470EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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