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Analog Devices Inc. LT3470AIDDB#TRPBF
- Part No.:
- LT3470AIDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470AIDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 250MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,715
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Product details
Overview
LT3470AIDDB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 440mA bipolar NPN power switch, catch diode, and boost Schottky diode in a thermally enhanced 8-lead 2mm × 3mm DFN package. It delivers up to 250mA at 3.3V or 5V output across 4V–40V input, achieves <10mV output ripple via Burst Mode®/hysteretic control, and draws only 35μA quiescent current - enabling long battery life in portable industrial sensors and automotive body electronics.
For engineers reviewing the LT3470AIDDB#TRPBF datasheet, LT3470AIDDB#TRPBF pinout, LT3470AIDDB#TRPBF application, or LT3470AIDDB#TRPBF equivalent, key selection criteria include its 4V–40V wide input range, integrated diodes eliminating external components, 0.75mm profile for space-constrained PCBs, and guaranteed –40°C to +125°C operation for under-hood automotive use.
Technical Context
The LT3470AIDDB#TRPBF employs hysteretic mode control with dual current comparators and an RS latch to regulate output voltage by dynamically adjusting switching frequency based on load, input, and output conditions - eliminating need for external compensation. Its internal bipolar NPN switch is driven either from VIN or a charge-pumped BOOST voltage (>2.5V above SW), enabling full saturation and low VCE(SAT) (150mV @ 100mA).
Burst Mode® operation engages at light loads (<10mA), reducing quiescent current to 35μA while maintaining regulation; continuous conduction resumes above ~20mA. Fast current limiting (top limit: 440mA typ, bottom limit: 280mA typ) and minimum off-time enforcement (500ns) provide robust short-circuit protection even at 40V input.
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 | 250mA max - sufficient for powering microcontrollers, RF transceivers, and analog front-ends in portable systems. |
| Quiescent Current | 35μA typical at 12VIN/3.3VOUT - enables >1-year battery life in always-on sensor nodes. |
| Shutdown Current | <1μA - disconnects load from input, simplifying power sequencing in multi-rail systems. |
| Feedback Reference | 1.25V ±1.0% - sets output via resistor divider (VOUT = 1.25V × (1 + R1/R2)), enabling adjustable outputs from 1.25V to 16V. |
| Switch Current Limit | 440mA typical - provides overcurrent protection while allowing margin for transient loads. |
| Output Ripple | <10mV peak-to-peak - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Operating Temp Range | –40°C to +125°C - qualified for automotive cabin and industrial control environments. |
Pinout & Package
LT3470AIDDB#TRPBF uses an 8-lead 2mm × 3mm plastic DFN package (DDB8) with exposed thermal pad (Pin 9) soldered to PCB ground for enhanced thermal performance (θJA = 80°C/W). The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulates output by sensing voltage divider tap; internal comparator holds at 1.25V reference. |
| BIAS (Pin 2) | Boost regulator supply | Connects to VOUT if >2.5V or VIN otherwise; supplies current to internal regulator when VBIAS > 3V. |
| BOOST (Pin 3) | Charge-pump drive node | Provides >2.5V above SW to fully saturate bipolar switch; requires 0.22μF capacitor to SW. |
| SW (Pin 4) | Switch node | Drives external inductor; connects to catch diode cathode and BOOST capacitor anode. |
| GND (Pin 5) | Power and signal ground | Must connect to local ground plane; feedback divider return and exposed pad tied here. |
| VIN (Pin 6) | Main input supply | Supplies internal regulator and power switch; requires local 1–2.2μF ceramic bypass. |
| NC (Pin 7) | No-connect | May be left floating, tied to VIN, or grounded - no electrical function. |
| SHDN (Pin 8) | Enable/shutdown control | Logic-high (≥2V) enables operation; grounded forces shutdown with <1μA input current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost & catch diodes | Eliminates two external Schottky diodes, reducing BOM count, board area, and parasitic losses. |
| Hysteretic + Burst Mode control | Enables stable regulation across 0–250mA load with <10mV ripple and 35μA IQ - no loop compensation needed. |
| Thermally enhanced DFN | 0.75mm height and exposed pad allow 250mA continuous output in 50mm² solution size, suitable for stacked PCBs. |
| Wide input range (4V–40V) | Supports direct connection to automotive batteries (cold crank 4.5V, load dump 36V) and industrial 24V rails. |
| Robust short-circuit protection | Hysteretic current limiting and 500ns minimum off-time prevent switch failure during sustained 40V output shorts. |
| Automotive-grade temperature range | –40°C to +125°C operation qualified per AEC-Q100 stress test guidelines for under-hood applications. |
Applications
| Automotive Body Control Module | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering CAN transceiver, microcontroller, and analog sensor in door module with 12V battery input subject to cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V/250mA with integrated diodes and 40V absolute max rating. Use Value: Eliminates external diodes and withstands 40V transients without clamping circuitry, reducing component count by 2 and PCB area by 12mm². |
Use Scenario: Battery-powered wireless temperature/humidity sensor operating in remote factory locations with 10-year lifetime requirement. IC Role / Device Role / Timing Role: Micropower DC/DC converter supplying 3.3V to MCU and radio during periodic wake-up bursts. Use Value: 35μA quiescent current extends primary lithium battery life beyond 10 years at 10-second wake intervals. |
| Portable Medical Instrument | Distributed Point-of-Load Supply |
Use Scenario: Handheld ECG device powered by two AA alkaline cells (1.8V–3.2V) requiring stable 3.3V rail for ADC and Bluetooth LE. IC Role / Device Role / Timing Role: Wide-input buck converter supporting operation down to 4V input via boost-capacitor-assisted start-up. Use Value: Maintains regulation until battery depletes to 1.8V per cell (3.6V total), maximizing usable battery capacity by 22% vs fixed-input regulators. |
Use Scenario: Distributed 5V supply for FPGA I/O banks in telecom base station card with 24V backplane input. IC Role / Device Role / Timing Role: Compact point-of-load regulator delivering 5V/250mA with <10mV ripple to minimize digital noise coupling. Use Value: Integrated diodes and 2mm × 3mm footprint enable placement directly adjacent to FPGA, reducing trace inductance and improving PSRR by 15dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471AIDDB#TRPBF | Higher 600mA switch current limit; identical pinout and package; same 4V–40V input range. | Required for loads >250mA or higher short-circuit robustness; larger inductor (47μH) recommended. | Select when output current exceeds 250mA or system requires higher fault-current margin. |
| TPS62130ARGTR | 3V–17V input; 3A output; synchronous rectification; 17μA IQ; QFN-16 package (3mm × 3mm). | Not suitable for 40V inputs or automotive transients; better efficiency above 100mA but lacks integrated boost diode. | Choose for lower-voltage, higher-current applications where board space allows larger package and external diode integration is acceptable. |
Compared with LT3470AIDDB#TRPBF, LT3471AIDDB#TRPBF offers higher current headroom in identical form factor, while TPS62130ARGTR trades 40V tolerance and integrated diodes for higher efficiency and output current at lower input voltages - making LT3470AIDDB#TRPBF optimal for ruggedized 12V/24V systems with strict size constraints.
Availability
LT3470AIDDB#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, portable medical instruments, and distributed point-of-load supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3470AIDDB#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 acquired Linear Technology in 2017 and maintains its high-reliability analog power portfolio. Linear Technology pioneered monolithic DC/DC converters with integrated power switches and passive components.
The LT3470A series was designed specifically for space- and power-constrained industrial and automotive applications requiring wide-input, micropower step-down conversion with minimal external components and guaranteed high-temperature operation.
FAQ
What is the maximum output current capability of the LT3470AIDDB#TRPBF?
The LT3470AIDDB#TRPBF delivers up to 250mA continuous output current at 3.3V or 5V across its 4V–40V input range. This is enabled by its integrated 440mA bipolar NPN switch and thermal design in the 2mm × 3mm DFN package. Derating applies above +85°C ambient; full 250mA is specified at TA ≤ +85°C with proper PCB copper pour on the exposed pad.
Does the LT3470AIDDB#TRPBF require external diodes?
No, the LT3470AIDDB#TRPBF integrates both the catch Schottky diode and boost Schottky diode internally. This eliminates two external components, reduces solution size by up to 12mm², and removes associated layout sensitivity and forward-voltage losses - confirmed in the "Integrated Boost and Catch Diodes" feature and typical application schematic.
What is the operating temperature range for the LT3470AIDDB#TRPBF?
The LT3470AIDDB#TRPBF is rated for –40°C to +125°C junction temperature, corresponding to industrial and automotive under-hood applications. This is the "I" grade variant (LT3470AI), verified per manufacturer specifications and distinct from the "E" (–40°C to +85°C) and "H" (+150°C) grades.
How does the LT3470AIDDB#TRPBF achieve low quiescent current?
The LT3470AIDDB#TRPBF achieves 35μA typical quiescent current using Burst Mode® operation: at light loads, it enters micropower state between switching bursts, disabling high-power circuitry while maintaining regulation via the 1.25V feedback comparator. Shutdown reduces current to <1μA by disconnecting the load from VIN.
Can the LT3470AIDDB#TRPBF be used with a 2-cell Li-ion battery input?
Yes, the LT3470AIDDB#TRPBF supports 4V–40V input, covering the full discharge range of two-series Li-ion batteries (typically 8.4V fully charged down to ~6V cutoff). Its 4V undervoltage lockout ensures reliable start-up even at end-of-discharge, and integrated diodes eliminate reverse-current concerns during battery swap.
LT3470AIDDB#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:
- 250mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3470AIDDB#TRPBF FAQ
1.How can I place an order for LT3470AIDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470AIDDB#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 LT3470AIDDB#TRPBF reliable?
The price and inventory of LT3470AIDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470AIDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3470AIDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470AIDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470AIDDB#TRPBF?
LT3470AIDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470AIDDB#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 LT3470AIDDB#TRPBF?
For technical support, including LT3470AIDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470AIDDB#TRPBF requirements.
6.How does Aetrix verify that LT3470AIDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3470AIDDB#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 LT3470AIDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3470AIDDB#TRPBF?
All LT3470AIDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470AIDDB#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 LT3470AIDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3470AIDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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