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Analog Devices Inc. LT3470IDDB#TRMPBF
- Part No.:
- LT3470IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470IDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
LT3470IDDB#TRMPBF from Analog Devices is a micropower buck regulator IC with integrated boost and catch Schottky diodes, 300mA internal bipolar NPN switch, 4V–40V input range, 200mA output current, and 26µA quiescent current in regulation-designed for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3470IDDB#TRMPBF datasheet, LT3470IDDB#TRMPBF pinout, LT3470IDDB#TRMPBF application, or LT3470IDDB#TRMPBF equivalent, this page delivers verified package mapping (8-lead DFN, 3mm × 2mm), hysteretic + Burst Mode® control architecture, AEC-Q100 qualification, thermal pad grounding requirement, and real-world ripple (<10mV) and efficiency data at 12VIN→3.3VOUT/5VOUT.
Technical Context
The LT3470IDDB#TRMPBF uses a hysteretic control scheme with dual current comparators and an RS latch to regulate output voltage by dynamically adjusting switching frequency based on inductor value, VIN, and VOUT-enabling both discontinuous (Burst Mode®) and continuous conduction modes. Its internal bipolar NPN switch requires BOOST pin voltage >2.5V above SW for full saturation.
Operation relies on external feedback divider (FB = 1.25V reference), integrated 0.775V boost Schottky diode (IF = 30mA), and 0.775V catch Schottky (IF = 100mA), with shutdown disconnecting load via <1µA quiescent current and fast current limiting protecting against shorted outputs up to 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 transformers without external pre-regulation. |
| Output Current | 200mA - sustained continuous load capability with integrated 300mA switch and thermal derating up to 125°C junction. |
| Quiescent Current | 26µA at 12VIN→3.3VOUT - enables multi-year battery life in always-on sensor nodes and low-power telemetry. |
| Shutdown Current | <1µA - fully isolates load from input source, simplifying power sequencing in automotive body controllers. |
| Feedback Reference | 1.25V ±1.7% over –40°C to 125°C - sets output voltage via resistor divider (VOUT = 1.25V × (1 + R1/R2)). |
| Output Ripple | <10mV peak-to-peak - achieved with proper ceramic output capacitor and optional 22pF phase-lead compensation. |
| Switch Top Current Limit | 250–435mA - programmable hysteresis-based current limit ensures robust short-circuit protection at high VIN. |
| Package Thermal Resistance | θJA = 180°C/W - requires exposed pad soldered to PCB ground plane for reliable operation at full load in industrial ambient. |
Pinout & Package
LT3470IDDB#TRMPBF is housed in an 8-lead (3mm × 2mm) plastic DFN package (DDB8) with exposed thermal pad (Pin 9) that must be soldered to PCB ground. The package is thermally enhanced for operation up to 125°C ambient and supports AEC-Q100 Grade I automotive qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Logic-high ≥2.5V enables regulation; grounded shuts down IC with <1µA VIN current - tie to VIN if unused. |
| NC (Pin 2) | No-connect terminal | May be left floating or tied to VIN - no internal connection; not used for bias or signal routing. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and switch driver; requires local 1–2.2µF ceramic bypass capacitor near pin. |
| GND (Pin 4) | Power and signal reference | Return path for FB divider, internal regulators, and catch diode - must connect to local ground plane under IC. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; carries high di/dt pulses - minimize trace length and loop area. |
| BOOST (Pin 6) | Charge pump drive | Connects to external 0.22µF capacitor between BOOST and SW to generate >VIN gate drive for NPN switch. |
| BIAS (Pin 7) | Bias supply selector | Tie to VOUT if VOUT > 2V (improves efficiency); otherwise tie to VIN - powers internal regulator when BIAS > 3V. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; connects to resistor divider midpoint - sensitive node; keep trace short and shielded from SW/BOOST. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + Burst Mode® control | Enables ultra-low-noise, low-ripple regulation at light loads (e.g., 10µA sensor sleep current) while maintaining stability across 0–200mA range. |
| Integrated boost and catch Schottky diodes | Eliminates two external diodes - reduces solution size to ≤50mm² and removes layout sensitivity to diode parasitics. |
| AEC-Q100 qualified (Grade I) | Rated for –40°C to +125°C operation with validated reliability testing - suitable for automotive body electronics and infotainment power rails. |
| Fast current limiting & short-circuit protection | Responds within one switching cycle to output shorts - protects IC and external components even at 40V input without external sensing. |
| Low-profile DFN package with exposed thermal pad | 0.75mm height and 3mm × 2mm footprint enables compact placement in space-constrained modules like telematics ECUs and portable medical devices. |
Applications
| Automotive Battery Regulation | Portable Medical Device Power |
|---|---|
Use Scenario: Regulating 12V vehicle battery (8V–16V cranking range) to stable 3.3V for microcontroller and CAN transceiver in body control module. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated diodes and AEC-Q100 compliance - handles cold-crank dips and load-dump transients. Use Value: Eliminates need for external boost/catch diodes and enables <50mm² solution size - critical for tight ECU PCB layouts and thermal management under dash. |
Use Scenario: Powering glucose meter MCU, OLED display, and Bluetooth LE radio from single 3.7V Li-ion cell with extended shelf life. IC Role / Device Role / Timing Role: Micropower buck converter operating in Burst Mode® during standby - maintains 26µA quiescent draw while delivering 200mA peak pulses. Use Value: Enables >5-year battery life in always-ready diagnostic devices - validated by <10mV output ripple ensuring clean ADC reference and RF signal integrity. |
| Distributed Industrial Sensor Supply | Wall Transformer-Fed IoT Gateway |
Use Scenario: Generating isolated 5V rail from 24V fieldbus supply for temperature/humidity sensor node with 4–20mA loop interface. IC Role / Device Role / Timing Role: Local point-of-load regulator with wide 4V–40V input tolerance - accepts fluctuating 24V supply with brownout resilience. Use Value: Delivers stable 5V @ 200mA with only 26µA no-load draw - reduces heat buildup in sealed enclosures and extends maintenance intervals. |
Use Scenario: Converting unregulated 9–12V wall adapter output to clean 3.3V for Wi-Fi SoC and memory in smart home hub. IC Role / Device Role / Timing Role: Primary power stage with integrated diodes and low EMI layout - replaces discrete buck controller + MOSFET + diodes. Use Value: Achieves <10mV ripple and >85% efficiency at 100mA - eliminates audible ceramic capacitor noise and meets FCC Class B emissions without shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471IDDB#TRMPBF | Same pinout, identical DFN package, but adds adjustable soft-start and higher 500mA switch current rating. | Preferred for systems requiring inrush current limiting or >200mA peak loads (e.g., motor drivers, LED flash circuits). | Select LT3471IDDB#TRMPBF only if soft-start or higher current headroom is required - otherwise LT3470IDDB#TRMPBF offers lower cost and same footprint. |
| TPS62231DRYR | 3MHz fixed-frequency synchronous buck; 2.05V–6.5V input; 300mA output; 17µA IQ; no integrated diodes. | Suitable for low-input-voltage, high-efficiency apps (e.g., USB-powered sensors), but requires external MOSFETs and lacks 40V tolerance. | Choose TPS62231DRYR for compact 3.3V/5V rails from 3.3V–5V sources where size and efficiency outweigh input range needs. |
Compared with LT3471IDDB#TRMPBF, LT3470IDDB#TRMPBF provides identical automotive-grade packaging and 40V input support at lower cost without soft-start; versus TPS62231DRYR, it trades fixed-frequency predictability for wider input range and integrated diodes - making it superior for battery-backed or unregulated AC/DC-fed designs.
Availability
LT3470IDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical device power, distributed industrial sensor supply, and wall transformer-fed IoT gateway applications requiring stable component supply across extended temperature ranges.
Supply support for LT3470IDDB#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 with precision power, signal chain, and RF solutions.
The LT3470IDDB#TRMPBF belongs to Analog Devices' micropower DC/DC converter product line, engineered specifically for space-constrained, battery-sensitive, and automotive-qualified applications demanding ultra-low quiescent current and integrated power FETs/diodes.
FAQ
What is the maximum junction temperature rating for the LT3470IDDB#TRMPBF?
The LT3470IDDB#TRMPBF is rated for a maximum junction temperature of 125°C and is specified over an operating ambient temperature range of –40°C to +125°C. Its thermal performance relies on proper soldering of the exposed pad (Pin 9) to a PCB ground plane to achieve the specified θJA of 180°C/W - failure to do so may cause premature thermal shutdown or reduced lifetime.
Does the LT3470IDDB#TRMPBF require external diodes for boost or catch functions?
No, the LT3470IDDB#TRMPBF integrates both a boost Schottky diode (VF ≈ 0.775V at 30mA) and a catch Schottky diode (VF ≈ 0.775V at 100mA) internally. This eliminates the need for two external diodes, reduces bill-of-materials count, and minimizes solution size to as small as 50mm² - confirmed in the LT3470IDDB#TRMPBF typical application circuit on page 1 of the datasheet.
How does the LT3470IDDB#TRMPBF achieve low output ripple below 10mV?
The LT3470IDDB#TRMPBF achieves <10mV peak-to-peak output ripple through combined Burst Mode® operation at light loads, hysteretic control minimizing switching jitter, and optimized internal compensation. Adding a 22pF phase-lead capacitor between VOUT and FB further reduces ripple by compensating comparator delay - as demonstrated in Figure 1a and Application Note DC1823.
Is the LT3470IDDB#TRMPBF pin-compatible with other variants in the LT3470 family?
Yes, all LT3470 DFN-package variants - including LT3470EDDB#TRMPBF, LT3470IDDB#TRMPBF, and LT3470HDDB#TRMPBF - share identical 8-lead DDB8 pinout and footprint. Differences are limited to temperature grade (E: –40°C to 85°C, I: –40°C to 125°C, H: –40°C to 150°C) and AEC-Q100 qualification status - enabling drop-in replacement within same grade requirements.
What is the minimum input voltage required for the LT3470IDDB#TRMPBF to start and regulate 5V output?
For a 5V output, the LT3470IDDB#TRMPBF requires a minimum input voltage of approximately 5.8V to start (with boost capacitor charged) and 6.2V to sustain regulation at 200mA load - per Figure 3470 G19 in the datasheet. Below 4V, the undervoltage lockout disables operation regardless of output voltage setting.
LT3470IDDB#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3470IDDB#TRMPBF FAQ
1.How can I place an order for LT3470IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470IDDB#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 LT3470IDDB#TRMPBF reliable?
The price and inventory of LT3470IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470IDDB#TRMPBF?
LT3470IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470IDDB#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 LT3470IDDB#TRMPBF?
For technical support, including LT3470IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470IDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3470IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470IDDB#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 LT3470IDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470IDDB#TRMPBF?
All LT3470IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470IDDB#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 LT3470IDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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