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Analog Devices Inc. LT3470EDDB#TRPBF
- Part No.:
- LT3470EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3470EDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,726
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Product details
Overview
LT3470EDDB#TRPBF from Analog Devices is a micropower buck regulator IC with integrated boost and catch Schottky diodes, 300mA internal bipolar NPN switch, and hysteretic/Burst Mode® control. 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 with 26µA quiescent current - ideal for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3470EDDB#TRPBF datasheet, LT3470EDDB#TRPBF pinout, LT3470EDDB#TRPBF application, or LT3470EDDB#TRPBF equivalent, this page provides verified package mapping (8-lead 3mm × 2mm DFN), confirmed thermal performance (θJA = 180°C/W), validated shutdown behavior (<1µA), and real-world design constraints including minimum inductor sizing and BOOST capacitor requirements.
Technical Context
The LT3470EDDB#TRPBF uses a hysteretic control architecture 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 low ripple via controlled pulse energy delivery.
It integrates a bipolar NPN power switch driven by a charge-pump boosted gate voltage (generated via external BOOST capacitor and internal Schottky diode), enabling full saturation down to 4V input. The BIAS pin supports efficient biasing from VOUT (>2V) or VIN, reducing quiescent current dependency on input rail.
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 continuous - limited by thermal design and inductor saturation; requires ≥33µH for robust 40V short-circuit protection. |
| Quiescent Current | 26µA typical at 12VIN/3.3VOUT - enables multi-year battery life in always-on sensor nodes. |
| Shutdown Current | <1µA - disconnects load from input source, simplifying power sequencing in battery-powered systems. |
| FB Reference Voltage | 1.25V ±1.7% over temperature - sets output via resistor divider; line regulation 0.01%/V ensures stability across wide input range. |
| Switch Top Current Limit | 325mA typical - defines peak inductor current during startup and overload; bottom limit is 225mA for discontinuous conduction control. |
| Output Ripple | <10mV peak-to-peak - achieved with proper ceramic output capacitor (e.g., 22µF X5R) and 22pF phase-lead capacitor. |
Pinout & Package
LT3470EDDB#TRPBF is housed in an 8-lead, 3mm × 2mm plastic DFN (DDB8) package with exposed ground pad (Pin 9), thermally enhanced for θJA = 180°C/W. The package is RoHS-compliant, lead-free, and requires soldering of the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Shutdown enable input | Logic-high ≥2.5V enables regulation; grounded disables all circuitry and reduces VIN current to leakage level (~nA). |
| NC (Pin 2) | No-connect terminal | May be left floating or tied to VIN; no internal connection - avoids unintended parasitic paths. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and switch; must be locally bypassed with 1–2.2µF ceramic capacitor to minimize EMI and input ripple. |
| GND (Pin 4) | Power and signal ground | Primary return path for switch, feedback divider, and internal regulators; must connect to local ground plane under IC. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; high dv/dt node requiring minimal trace area and separation from sensitive signals. |
| BOOST (Pin 6) | Charge-pump bootstrap supply | Generates >VIN voltage to saturate bipolar switch; requires 0.22µF capacitor between BOOST and SW pins. |
| BIAS (Pin 7) | Bias supply selector | Tied to VOUT if >2V (reducing quiescent current); otherwise tied to VIN - determines internal regulator operating point. |
| FB (Pin 8) | Feedback reference input | Regulated to 1.25V; sets output via R1/R2 divider; high-impedance node requiring small layout area and shielding from SW/BOOST. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + Burst Mode® control | Enables automatic transition between continuous switching (high load) and micropower burst pulses (light load), eliminating external compensation and minimizing idle power. |
| Integrated boost and catch Schottky diodes | Removes need for two external diodes; reduces solution size to ≤50mm² and eliminates diode selection, placement, and thermal management overhead. |
| AEC-Q100 qualified (E-grade) | Rated for –40°C to +85°C ambient; validated for automotive battery regulation applications including start-stop and load-dump environments. |
| Low-profile DFN package with exposed pad | 0.75mm height and thermal pad enable high-power density in space-constrained designs (e.g., telematics modules, ADAS sensors). |
| Fast current limiting and short-circuit protection | Top/bottom current comparators and 500ns minimum off-time prevent switch overstress even at 40V input into shorted output. |
Applications
| Automotive Battery Regulation | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and analog front-end in vehicle body control module supplied directly from 12V battery rail. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator providing stable 3.3V/5V from noisy, wide-range (6–16V) battery bus with cold-crank tolerance. Use Value: 26µA quiescent current prevents battery drain during extended key-off periods; AEC-Q100 qualification ensures reliability across temperature and vibration stress. |
Use Scenario: Supplying ultra-low-power glucose meter or pulse oximeter with coin-cell or rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V at ≤100mA with dynamic load steps during sensor activation and Bluetooth transmission. Use Value: Burst Mode® maintains <10mV ripple during measurement cycles while extending battery runtime beyond 1 year on single CR2032 cell. |
| Distributed Industrial Sensor Node | Wall Adapter-Fed IoT Gateway |
|
Use Scenario: Powering isolated RS-485 transceiver, temperature/humidity sensor, and low-power MCU in factory-floor wireless node. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V industrial bus to 5V/3.3V with high noise immunity and fast transient response. Use Value: 40V absolute max input withstands induced transients; integrated diodes eliminate failure-prone external components in harsh EMI environments. |
Use Scenario: Regulating output of unregulated 9–12V wall adapter to clean 5V for Wi-Fi SoC and USB peripherals in smart home hub. IC Role / Device Role / Timing Role: Secondary regulator improving efficiency and reducing heat vs. linear LDO; handles variable adapter output and load surges. Use Value: Solution size ≤50mm² fits compact enclosure; 200mA capability supports simultaneous Wi-Fi + BLE + Zigbee radios without thermal derating. |
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; 3.4–42V input. | Higher current, lower IQ, but larger solution size and no integrated catch/boost diodes - unsuitable where board space or BOM count is critical. | Choose LT8606IMSE#TRPBF only when >200mA output or sub-µA standby is required; not drop-in due to different pinout and control scheme. |
| TPS54202DRCT | 2A synchronous buck; 2µA IQ; 4.5–28V input; integrated FETs but no boost/catch diodes; requires external compensation. | Higher efficiency at medium loads, but lacks 40V rating and integrated diodes - cannot replace LT3470EDDB#TRPBF in 36–40V industrial or automotive inputs. | Prefer TPS54202DRCT for cost-sensitive 12V-input consumer devices; avoid where input exceeds 28V or diode integration is mandatory. |
Compared with LT3470EDDB#TRPBF, LT8606IMSE#TRPBF offers higher current and lower IQ but increases BOM count and layout complexity, while TPS54202DRCT trades 40V tolerance and diode integration for higher efficiency at lower input voltages - neither matches the LT3470EDDB#TRPBF's combination of wide input, micropower operation, and minimal external component count in space-constrained 200mA applications.
Availability
LT3470EDDB#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical instrumentation, distributed industrial sensor nodes, and wall adapter-fed IoT gateways requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LT3470EDDB#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 industrial, automotive, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LT3470EDDB#TRPBF belongs to Analog Devices' micropower DC/DC converter product line, designed specifically for space- and power-constrained applications requiring wide-input-voltage operation, ultra-low quiescent current, and minimal external components.
FAQ
What is the maximum input voltage rating for the LT3470EDDB#TRPBF?
The LT3470EDDB#TRPBF has an absolute maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 40V operation, use a ≥33µH inductor with ≥450mA saturation current to ensure robust short-circuit protection under worst-case conditions.
Does the LT3470EDDB#TRPBF require external diodes?
No, the LT3470EDDB#TRPBF integrates both the boost Schottky diode (for gate drive boosting) and the catch Schottky diode (for inductor freewheeling), eliminating the need for two external diodes. This integration reduces BOM count, PCB area, and thermal design complexity - a key differentiator versus most competing buck controllers.
What package type and thermal characteristics does the LT3470EDDB#TRPBF use?
The LT3470EDDB#TRPBF uses an 8-lead, 3mm × 2mm plastic DFN (DDB8) package with exposed ground pad (Pin 9). Its thermal resistance is θJA = 180°C/W when mounted on a standard 2-layer PCB with the exposed pad soldered to a 1cm² copper area - critical for maintaining junction temperature below 125°C at full 200mA load.
How does the LT3470EDDB#TRPBF achieve low output ripple despite using Burst Mode® operation?
The LT3470EDDB#TRPBF achieves <10mV output ripple by combining Burst Mode®'s low-energy pulses with precise hysteretic control that limits inductor current swing, plus optional 22pF phase-lead capacitor across the feedback divider to dampen comparator delay-induced ripple - all without requiring large output capacitance or complex compensation networks.
Is the LT3470EDDB#TRPBF qualified for automotive applications?
Yes, the LT3470EDDB#TRPBF is AEC-Q100 qualified (Grade E, –40°C to +85°C) and explicitly listed in Analog Devices' automotive product documentation for use in battery regulation, body electronics, and infotainment power supplies - meeting stress testing, reliability, and traceability requirements for automotive production.
LT3470EDDB#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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT3470EDDB#TRPBF FAQ
1.How can I place an order for LT3470EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470EDDB#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 LT3470EDDB#TRPBF reliable?
The price and inventory of LT3470EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3470EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470EDDB#TRPBF?
LT3470EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470EDDB#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 LT3470EDDB#TRPBF?
For technical support, including LT3470EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470EDDB#TRPBF requirements.
6.How does Aetrix verify that LT3470EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3470EDDB#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 LT3470EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3470EDDB#TRPBF?
All LT3470EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470EDDB#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 LT3470EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3470EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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