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Analog Devices Inc. LT3470AIDDB#TRMPBF
- Part No.:
- LT3470AIDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470AIDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 250MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
LT3470AIDDB#TRMPBF 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 across 4V–40V input, achieves <10mV output ripple via Burst Mode®/hysteretic control, and draws only 35μA quiescent current - enabling compact, low-noise power for battery-powered industrial sensors and portable instrumentation.
For engineers reviewing the LT3470AIDDB#TRMPBF datasheet, LT3470AIDDB#TRMPBF pinout, LT3470AIDDB#TRMPBF application, or LT3470AIDDB#TRMPBF equivalent, key selection criteria include its 4V–40V wide input range, integrated diodes eliminating external components, 35μA operating quiescent current, <1μA shutdown current, and guaranteed –40°C to +125°C operation - critical for automotive battery regulation and distributed supply systems requiring high reliability and minimal board space.
Technical Context
The LT3470AIDDB#TRMPBF 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 Burst Mode® operation enables micropower state transitions at light loads while maintaining continuous conduction above ~20mA, ensuring stable regulation without external timing components.
Internal bipolar NPN switch saturation is actively managed via BOOST pin voltage (>2.5V above SW), generated by an internal Schottky diode and external 0.22μF capacitor; insufficient BOOST voltage triggers 50mA BIAS pin preload to recharge the capacitor. Shutdown is achieved by grounding SHDN (Pin 8), reducing VIN current to ~100nA.
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 - extends battery life in always-on sensor nodes and IoT edge devices. |
| Shutdown Current | <1μA - fully isolates load from input source, simplifying power sequencing in multi-rail systems. |
| Output Ripple | <10mV peak-to-peak - meets noise-sensitive analog circuit requirements without additional LC filtering. |
| FB Reference Voltage | 1.25V ±1.4% - sets output via external resistor divider; enables adjustable outputs from 1.25V to 16V. |
| Switch Current Limit | 440mA typical - provides robust short-circuit protection even at 40V input with ≥33μH inductor. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment applications. |
Pinout & Package
LT3470AIDDB#TRMPBF 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 | Regulated to 1.25V; connects to resistor divider tap to set VOUT = 1.25V × (1 + R1/R2). |
| BIAS (Pin 2) | Boost regulator supply | Tied to VOUT if >2.5V, else to VIN; supplies current to internal regulator when VBIAS > 3V. |
| BOOST (Pin 3) | Boost capacitor node | Drives internal switch gate; must be >2.5V above SW for full saturation; connects to 0.22μF capacitor. |
| SW (Pin 4) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current. |
| GND (Pin 5) | Power ground | Reference for FB, SHDN, and internal circuits; must connect to local ground plane under IC. |
| VIN (Pin 6) | Main input supply | Supplies internal regulator and power switch; requires local 1–2.2μF ceramic bypass capacitor. |
| NC (Pin 7) | No-connect | May be left floating, tied to VIN, or grounded - no electrical function. |
| SHDN (Pin 8) | Shutdown control | Logic-low (≤0.2V) disables all circuitry; ≥2V enables operation; unused pin tied to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost & catch diodes | Eliminates two external Schottky diodes, reducing solution size to ≤50mm² and component count in space-constrained designs. |
| Hysteretic + Burst Mode control | Enables automatic transition between low-ripple continuous operation (>20mA) and ultra-low-power micropower bursts (<20mA), optimizing efficiency across full load range. |
| Thermally enhanced DFN | 0.75mm profile with exposed GND pad allows direct PCB heat sinking - supports 250mA output at +125°C ambient without derating. |
| Wide input voltage range | 4V–40V operation accommodates fluctuating sources like automotive batteries (9V–16V) and industrial 24V rails with margin, avoiding intermediate regulators. |
| Fast current limiting & short-circuit protection | Hardware-based top/bottom current limits respond within nanoseconds, protecting switch and inductor during output faults - no software or external sensing required. |
Applications
| Automotive Battery Regulation | Power for Portable Products |
|---|---|
Use Scenario: Regulating 9V–16V automotive battery rail to 3.3V/5V for infotainment MCU, CAN transceiver, and sensor interface. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise, and fault-tolerant power domain with built-in short-circuit protection at 40V transients. Use Value: Eliminates need for external TVS and pre-regulator; 35μA quiescent current prevents battery drain during vehicle sleep mode. | Use Scenario: Powering handheld medical monitors, barcode scanners, and ruggedized PDAs with 2-cell Li-ion (6V–8.4V) or USB-C (5V–20V) input. IC Role / Device Role / Timing Role: Micropower DC/DC converter delivering regulated 3.3V/5V to mixed-signal SoCs and display drivers with minimal thermal footprint. Use Value: Integrated diodes and 2mm × 3mm DFN reduce bill-of-materials and PCB area by >30% versus discrete solutions. |
| Distributed Supply Regulation | Industrial Supplies |
Use Scenario: Local point-of-load conversion of 12V/24V backplane rails to 3.3V for FPGA I/O banks, ADC reference supplies, and isolated communication interfaces. IC Role / Device Role / Timing Role: Compact, high-reliability buck regulator supporting hot-swap and brown-out immunity in modular PLC and I/O terminal designs. Use Value: 40V absolute max rating and –40°C to +125°C operation ensure robustness against industrial surge events and ambient temperature extremes. | Use Scenario: Powering field instruments, valve controllers, and loop-powered transmitters from 24V DC industrial supplies subject to line transients and EMI. IC Role / Device Role / Timing Role: Primary DC/DC stage providing low-EMI, low-ripple output with inherent input overvoltage tolerance and fast transient response. Use Value: Hysteretic control eliminates external compensation; <10mV ripple avoids signal integrity issues in precision analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EDD#PBF | Higher 100V input rating, 500mA output, but larger 10-lead 3mm × 4mm DFN and 120μA quiescent current. | Better suited for 48V telecom or PoE-powered equipment; less optimal for ultra-low-power battery apps. | Select LTC3642EDD#PBF only when input exceeds 40V or output current >250mA is required. |
| TPS62840DDCR | Lower 0.7V–5.5V input, 1.8V–5.5V output, 750mA capability, 300nA shutdown, but no integrated catch diode and requires external MOSFET. | Optimized for single-cell Li-ion and wearables; lacks 40V tolerance and integrated diodes needed for industrial/automotive inputs. | Choose TPS62840DDCR for sub-1VIN or ultra-deep sleep applications where external FET integration is acceptable. |
Compared with LTC3642EDD#PBF and TPS62840DDCR, LT3470AIDDB#TRMPBF uniquely balances 40V input tolerance, integrated diodes, 35μA quiescent current, and compact 2mm × 3mm footprint - making it the optimal choice for space- and power-constrained industrial and automotive buck applications requiring no external diodes.
Availability
LT3470AIDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power management, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +125°C operation.
Supply support for LT3470AIDDB#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3470AIDDB#TRMPBF belongs to ADI's legacy Linear Technology micropower DC/DC converter family, designed specifically for ultra-low-quiescent-current, wide-input-voltage, and space-constrained applications in harsh environments.
FAQ
What is the maximum output current capability of the LT3470AIDDB#TRMPBF?
The LT3470AIDDB#TRMPBF delivers up to 250mA continuous output current at 3.3V or 5V across its full 4V–40V input range, provided a minimum 33μH inductor with ≥450mA saturation current is used. This rating is validated under thermal constraints at +125°C ambient and assumes proper PCB layout with exposed pad soldered to ground.
Does the LT3470AIDDB#TRMPBF require external diodes?
No, the LT3470AIDDB#TRMPBF integrates both the catch Schottky diode and boost Schottky diode internally, eliminating the need for external diodes. This reduces total solution size to as small as 50mm² and simplifies design - unlike many competing buck regulators that require two external Schottky diodes for similar functionality.
What is the shutdown current specification for LT3470AIDDB#TRMPBF?
The LT3470AIDDB#TRMPBF draws less than 1μA in shutdown mode when the SHDN pin is pulled low (≤0.2V), effectively disconnecting the load from the input source. This ultra-low leakage supports long-term battery backup and zero-power-off states in energy-sensitive systems such as remote sensors and smart meters.
Can LT3470AIDDB#TRMPBF operate from a 2-cell Li-ion battery?
Yes, the LT3470AIDDB#TRMPBF supports input voltages from 4V to 40V, fully covering the 6V–8.4V range of a 2-cell Li-ion battery. Its 35μA quiescent current and <1μA shutdown current maximize runtime, while integrated diodes and robust short-circuit protection ensure reliability during battery discharge and load transients.
What package type and thermal characteristics does LT3470AIDDB#TRMPBF use?
The LT3470AIDDB#TRMPBF uses an 8-lead, 2mm × 3mm plastic DFN package (DDB8) with exposed thermal pad (Pin 9) soldered to PCB ground. Its thermal resistance is θJA = 80°C/W, enabling 250mA output at +125°C ambient when properly mounted - critical for under-hood automotive and industrial control applications.
LT3470AIDDB#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:
- 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#TRMPBF FAQ
1.How can I place an order for LT3470AIDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470AIDDB#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 LT3470AIDDB#TRMPBF reliable?
The price and inventory of LT3470AIDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470AIDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470AIDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470AIDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470AIDDB#TRMPBF?
LT3470AIDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470AIDDB#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 LT3470AIDDB#TRMPBF?
For technical support, including LT3470AIDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470AIDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3470AIDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470AIDDB#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 LT3470AIDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470AIDDB#TRMPBF?
All LT3470AIDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470AIDDB#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 LT3470AIDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470AIDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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