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Analog Devices Inc. LT3470ETS8#TRPBF
- Part No.:
- LT3470ETS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3470ETS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
LT3470ETS8#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 across a 4V–40V input range, with 26µA quiescent current and <10mV output ripple-ideal for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3470ETS8#TRPBF datasheet, LT3470ETS8#TRPBF pinout, LT3470ETS8#TRPBF application, or LT3470ETS8#TRPBF equivalent, this page provides verified package mapping (TSOT-23-8), confirmed thermal performance (θJA = 140°C/W), validated shutdown behavior (<1µA), exact FB reference voltage (1.25V), and real-world inductor sizing guidance per load and VIN.
Technical Context
The LT3470ETS8#TRPBF uses a hysteretic control architecture with dual current comparators and an RS latch to regulate via top/bottom switch current limits (250–435mA top, 225mA bottom), enabling automatic transition between Burst Mode® (low-load, low-ripple) and continuous switching (high-load). Its internal bipolar NPN switch requires BOOST pin voltage >2.5V above SW for full saturation, supplied via external 0.22µF capacitor and integrated Schottky diode.
Operation relies on feedback regulation of the FB pin to 1.25V with ±12.5mV tolerance over temperature, while SHDN enables true zero-current shutdown (<1µA), and BIAS pin sourcing supports internal regulator operation when VOUT > 2V. Minimum off-time is fixed at 500ns, and maximum duty cycle is limited to ~90% to maintain stability under high-VIN, low-VOUT conditions.
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 - sustained delivery with integrated 300mA switch and thermal derating per θJA = 140°C/W. |
| Quiescent Current | 26µA at 12VIN→3.3VOUT - enables multi-year battery life in always-on sensor nodes. |
| FB Reference Voltage | 1.25V ±1% - sets output via R1/R2 divider; line regulation 0.01%/V ensures stability across input transients. |
| Shutdown Current | <1µA - disconnects load from input, simplifying power sequencing in automotive modules. |
| Output Ripple | <10mV peak-to-peak - achieved with proper 22pF phase-lead cap and low-ESR output capacitor. |
| Switch VCESAT | 215mV at 100mA (TS8 package) - low conduction loss enables >85% efficiency at 100mA/12VIN→5VOUT. |
| Operating Temp Range | –40°C to +85°C - qualified per E-grade specification; suitable for industrial and consumer environments. |
Pinout & Package
LT3470ETS8#TRPBF is housed in an 8-lead Plastic TSOT-23 package (1mm profile), thermally enhanced with θJA = 140°C/W. Exposed pad is not present in TSOT-23 variant; PCB layout must prioritize compact SW/BOOST/GND loop area to minimize EMI.
| 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 electrical function-no routing required. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and switch; requires local 1–2.2µF ceramic bypass near pin. |
| GND (Pin 4) | Power ground reference | Return path for switch, catch diode, and feedback divider; must connect to single-point system ground. |
| SW (Pin 5) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt pulses. |
| BOOST (Pin 6) | Boost drive supply | Accepts charge from internal Schottky; must exceed SW by >2.5V to saturate NPN switch. |
| BIAS (Pin 7) | Bias supply input | Tied to VOUT if >2V, else to VIN; sources internal regulator current when VBIAS > 3V. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; sets VOUT = 1.25V × (1 + R1/R2); sensitive to noise-keep trace short and shielded. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost & Catch Diodes | Eliminates 2 external Schottky diodes, reducing solution size to ≤50mm² and component count in space-constrained designs. |
| Burst Mode® Operation | Maintains <10mV ripple at light loads while holding quiescent current to 26µA-critical for battery longevity. |
| Hysteretic Control Architecture | Enables self-adjusting frequency and inherent short-circuit protection without external compensation network. |
| AEC-Q100 Qualified (E-grade) | Validated for automotive battery regulation applications including infotainment and body electronics modules. |
| Thermally Enhanced TSOT-23 | 140°C/W junction-to-ambient thermal resistance enables 200mA output without heatsink in ambient ≤60°C. |
Applications
| Automotive Battery Regulation | Portable Medical Sensors |
|---|---|
Use Scenario: Regulating 12V vehicle battery down to 3.3V for microcontroller and CAN transceiver in ADAS camera module. IC Role / Device Role / Timing Role: Primary DC/DC converter providing stable, low-noise 3.3V rail with fast transient response to ignition pulses. Use Value: AEC-Q100 qualification ensures reliability across –40°C to +85°C; 26µA IQ extends backup battery life during key-off monitoring. |
Use Scenario: Powering wearable ECG patch with Bluetooth LE MCU and analog front-end from coin cell. IC Role / Device Role / Timing Role: Micropower step-down regulator enabling multi-week operation on CR2032 with minimal board area. Use Value: Burst Mode® maintains <10mV ripple at µA loads while integrated diodes eliminate 2 passives-reducing BOM cost and assembly steps. |
| Distributed Industrial I/O | Wall Adapter-Powered IoT Hub |
Use Scenario: Local 5V supply for isolated RS-485 transceiver and microcontroller in factory floor sensor node. IC Role / Device Role / Timing Role: Input-flexible buck converter accepting 7–36V unregulated industrial bus, rejecting line noise via hysteretic control. Use Value: 4V–40V input range accommodates brownouts and surges; 500ns minimum off-time prevents instability during fault recovery. |
Use Scenario: Converting 9–24V wall adapter output to 3.3V for Wi-Fi SoC and sensors in smart home hub. IC Role / Device Role / Timing Role: Primary power stage delivering 200mA with low EMI due to optimized SW/BOOST loop layout. Use Value: TSOT-23 package fits tight enclosure constraints; <10mV ripple meets RF-sensitive SoC requirements without extra LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3692EMSE#TRPBF | Higher 400mA output, wider 3.5V–60V input, but larger 16-lead MSE package and 40µA IQ. | Requires PCB redesign for footprint and thermal relief; better suited for 300mA+ industrial rails. | Select when >200mA load or >40V input is required; avoid for space-constrained or ultra-low-IQ designs. |
| TPS62130ARGTR | 3A synchronous buck, 2.95V–6V input, 17µA IQ, but lacks integrated boost diode and AEC-Q100 rating. | Cannot replace LT3470ETS8#TRPBF in 12V automotive or >6V input systems without external boost circuit. | Prefer for low-input, high-current consumer apps; not drop-in for 4–40V or automotive use cases. |
Compared with LT3470ETS8#TRPBF, LT3692EMSE#TRPBF offers higher current and input range at the cost of size and quiescent current, while TPS62130ARGTR trades input flexibility and automotive qualification for raw current capability and lower IQ in narrow-input applications.
Availability
LT3470ETS8#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical sensors, and distributed industrial I/O requiring stable component supply with guaranteed long-term availability.
Supply support for LT3470ETS8#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 precision instrumentation, industrial automation, and automotive markets since 1965.
The LT3470ETS8#TRPBF belongs to Analog Devices' micropower DC/DC converter product line, designed specifically for space- and energy-constrained applications where input voltage variability, low IQ, and AEC-Q100 compliance are critical.
FAQ
What is the maximum output current supported by the LT3470ETS8#TRPBF?
The LT3470ETS8#TRPBF delivers up to 200mA continuously under typical conditions with proper thermal design. Its internal 300mA bipolar NPN switch and 140°C/W θJA enable this rating in the TSOT-23 package. Derating applies above +60°C ambient; consult the thermal curves in the LT3470 datasheet Rev. E for precise junction temperature modeling.
Does the LT3470ETS8#TRPBF require external diodes?
No, the LT3470ETS8#TRPBF integrates both the boost Schottky diode (for switch drive) and the catch Schottky diode (for inductor freewheeling), eliminating two external components. This integration reduces solution size to as little as 50mm² and improves reliability in high-vibration environments like automotive applications.
How does the LT3470ETS8#TRPBF achieve low quiescent current?
The LT3470ETS8#TRPBF achieves 26µA quiescent current through Burst Mode® operation, which alternates between micropower standby and brief switching bursts to maintain regulation. In shutdown mode (SHDN = GND), current drops below 1µA. The internal regulator draws current only from BIAS or VIN as needed, minimizing static losses.
Can the LT3470ETS8#TRPBF be used in automotive applications?
Yes, the LT3470ETS8#TRPBF is AEC-Q100 qualified for automotive applications and rated for –40°C to +85°C operation (E-grade). It is explicitly listed in the datasheet for automotive battery regulation, supporting start-stop systems and infotainment modules where input transients and temperature extremes are common.
What is the recommended output capacitor for the LT3470ETS8#TRPBF?
Analog Devices recommends ≥22µF output capacitance with low ESR (<150mΩ) for 3.3V output with 33µH inductor. Sanyo POSCAP B-case or high-quality tantalum capacitors are preferred; X5R/X7R ceramics work well if rated for full voltage and temperature range-but avoid Y5V/Z5U types due to capacitance collapse and audible noise.
LT3470ETS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- TSOT-23-8
LT3470ETS8#TRPBF FAQ
1.How can I place an order for LT3470ETS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470ETS8#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 LT3470ETS8#TRPBF reliable?
The price and inventory of LT3470ETS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470ETS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3470ETS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470ETS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470ETS8#TRPBF?
LT3470ETS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470ETS8#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 LT3470ETS8#TRPBF?
For technical support, including LT3470ETS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470ETS8#TRPBF requirements.
6.How does Aetrix verify that LT3470ETS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3470ETS8#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 LT3470ETS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3470ETS8#TRPBF?
All LT3470ETS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470ETS8#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 LT3470ETS8#TRPBF part is unused and in its original packaging.
Return procedure for LT3470ETS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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