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Analog Devices Inc. LT3470ETS8#TRMPBF
- Part No.:
- LT3470ETS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3470ETS8#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,655
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Product details
Overview
LT3470ETS8#TRMPBF from Analog Devices is a micropower step-down DC/DC converter integrating a 300mA bipolar NPN power switch, catch diode, and boost Schottky diode in an 8-lead TSOT-23 package. It operates from 4V to 40V input, delivers up to 200mA at adjustable output (1.25V–16V), and achieves <10mV output ripple using Burst Mode® and hysteretic control-ideal for automotive battery regulation and portable product power supplies.
For engineers reviewing the LT3470ETS8#TRMPBF datasheet, LT3470ETS8#TRMPBF pinout, LT3470ETS8#TRMPBF application, or LT3470ETS8#TRMPBF equivalent, key selection factors include its 26µA quiescent current at 12VIN/3.3VOUT, AEC-Q100 qualification (E-grade, –40°C to 85°C), integrated diodes eliminating external components, and thermal performance with θJA = 140°C/W in TSOT-23.
Technical Context
The LT3470ETS8#TRMPBF uses a hysteretic control architecture with dual current comparators and an RS latch to regulate output by dynamically adjusting switching frequency based on load, input, and output voltage-enabling both low-ripple Burst Mode® operation at light loads and continuous conduction at higher loads. Its internal bipolar NPN switch requires BOOST pin voltage >2.5V above SW for full saturation.
Startup relies on a 0.22µF external capacitor between BOOST and SW pins to generate a boosted gate drive voltage; BIAS pin must be tied to VOUT when VOUT > 2V or to VIN otherwise to supply bias current to the internal regulator. Shutdown disconnects load from input with <1µA leakage.
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. |
| Quiescent Current | 26µA at 12VIN/3.3VOUT - enables multi-year battery life in always-on sensor nodes. |
| Output Current | 200mA maximum - sufficient for powering microcontrollers, RF modules, and analog front-ends. |
| Output Ripple | <10mV peak-to-peak - meets noise-sensitive analog circuit requirements without additional post-filtering. |
| Shutdown Current | <1µA - fully isolates load during system sleep, simplifying power sequencing. |
| Feedback Reference | 1.25V ±1.7% - enables precise output setting via resistor divider (VOUT = 1.25V × (1 + R1/R2)). |
| Switch Top Limit | 250–435mA - provides robust short-circuit protection across temperature and process variation. |
| Package Thermal Resistance | θJA = 140°C/W - allows 200mA operation in ambient up to 85°C with minimal PCB copper. |
Pinout & Package
LT3470ETS8#TRMPBF uses an 8-lead Plastic TSOT-23 package (1mm profile, 3mm × 1.75mm footprint) with exposed pad not present-thermal dissipation relies on standard pad layout per Analog Devices' recommended land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Logic-high ≥2.5V enables regulation; grounded disables all circuitry and reduces VIN current to <1µA. |
| NC (Pin 2) | No-connect terminal | May be left floating or tied to VIN; no electrical function-used for mechanical stability in TSOT-23. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and power switch; requires local 1–2.2µF ceramic bypass capacitor. |
| GND (Pin 4) | Power and signal reference | Return path for switch, feedback divider, and internal circuits; must connect to single-point ground plane. |
| SW (Pin 5) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt pulsed current. |
| BOOST (Pin 6) | Boost capacitor connection | Drives internal switch gate via external 0.22µF capacitor; voltage must exceed SW by >2.5V for full saturation. |
| BIAS (Pin 7) | Bias supply input | Tied to VOUT if >2V, else to VIN; supplies current to internal regulator when VBIAS >3V. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; connects to resistor divider midpoint-determines output voltage and loop stability. |
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 | Delivers low-noise, low-ripple regulation at light loads while maintaining efficiency >80% at 10mA and >90% at 100mA. |
| AEC-Q100 Qualified (E-grade) | Validated for automotive applications including body electronics and infotainment power rails with guaranteed –40°C to 85°C operation. |
| Fast Current Limiting | Protects against output shorts even at 40V input via instantaneous top/bottom current comparator trip (250–435mA/225mA). |
| Low Profile TSOT-23 Package | Enables ultra-thin portable devices and dense automotive ECUs where height <1mm is critical for mechanical stacking. |
Applications
| Automotive Battery Regulation | Portable Medical Sensors |
|---|---|
Use Scenario: Regulating 12V vehicle battery (9–16V nominal, up to 40V transients) to stable 3.3V for CAN transceivers and microcontrollers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise power with transient immunity and shutdown isolation during ignition-off. Use Value: Meets ISO 7637-2 pulse 5a (40V/100ms) without external TVS; 26µA quiescent current extends battery standby time beyond 1 year. | Use Scenario: Powering wearable ECG monitors and glucose meters powered by coin-cell or Li-poly batteries. IC Role / Device Role / Timing Role: Micropower DC/DC converter enabling multi-week runtime from CR2032 cells while maintaining <10mV ripple for ADC reference stability. Use Value: Integrated diodes reduce bill-of-materials cost by $0.12/unit; Burst Mode® eliminates audible ceramic capacitor noise during patient monitoring. |
| Distributed Industrial Supply | Wall Adapter Powered IoT Gateways |
Use Scenario: Generating local 5V rails from 24V industrial bus for fieldbus interface ICs and isolated RS-485 transceivers. IC Role / Device Role / Timing Role: Point-of-load regulator delivering clean, regulated power with fast transient response to digital logic bursts. Use Value: Hysteretic control ensures immediate recovery from 100mA load steps without external compensation; 40V max input handles brownout surges. | Use Scenario: Converting unregulated 9–12V wall adapter output to 3.3V for Wi-Fi/BLE SoCs and flash memory in smart home hubs. IC Role / Device Role / Timing Role: Primary DC/DC stage replacing linear regulators to improve efficiency and reduce thermal stress in enclosed plastic enclosures. Use Value: 200mA output supports concurrent radio transmission; 50mm² solution size fits within tight PCB area budgets of compact consumer housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8606IMSE#TRPBF | Synchronous rectification, 3.5V–42V input, 1.2A output, 2.5µA quiescent current; requires external MOSFETs for catch/boost functions. | Higher current capability but larger solution size (requires 4 external FETs); not AEC-Q100 qualified in IMSE package. | Select when >200mA output or lower quiescent current is required; avoid if AEC-Q100 compliance or minimal BOM count is mandatory. |
| TPS62840DGRR | 1.8V–6.5V input, 1A output, 0.075µA shutdown current; uses DCS-Control™ topology with external compensation. | Cannot support 40V input or automotive transients; optimized for single-cell Li-ion systems only. | Select for ultra-low-power battery-powered devices below 6.5V input; unsuitable for 12V/24V/40V industrial or automotive sources. |
Compared with LT8606IMSE#TRPBF and TPS62840DGRR, the LT3470ETS8#TRMPBF uniquely combines 40V input tolerance, integrated diodes, AEC-Q100 qualification, and sub-30µA quiescent current in a TSOT-23 package-making it optimal for cost-sensitive, space-constrained automotive and industrial point-of-load applications where external diode omission is critical.
Availability
LT3470ETS8#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical sensors, and distributed industrial supply requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT3470ETS8#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.
The LT3470ETS8#TRMPBF belongs to Analog Devices' micropower DC/DC converter product line, designed specifically for space- and power-constrained applications demanding high input voltage range, ultra-low quiescent current, and integrated power components.
FAQ
What is the maximum input voltage rating for the LT3470ETS8#TRMPBF?
The LT3470ETS8#TRMPBF has an absolute maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. Operation at this voltage is supported with appropriate inductor selection (e.g., ≥33µH for short-circuit robustness) and proper thermal design. Exceeding 40V risks permanent device damage.
Does the LT3470ETS8#TRMPBF require external diodes for boost or catch functionality?
No, the LT3470ETS8#TRMPBF integrates both a boost Schottky diode and a catch Schottky diode internally. This eliminates the need for two external diodes, reducing solution size, component count, and board assembly cost-confirmed in the Features section and Block Diagram of the official datasheet.
What is the guaranteed operating temperature range for the LT3470ETS8#TRMPBF?
The LT3470ETS8#TRMPBF is rated for –40°C to +85°C ambient operation (E-grade). This is explicitly stated in the Order Information table under "Operating Temperature Range" and validated per AEC-Q100 for automotive use cases.
How does the LT3470ETS8#TRMPBF achieve low output ripple without external LC filtering?
The LT3470ETS8#TRMPBF achieves <10mV peak-to-peak output ripple through combined Burst Mode® operation at light loads and hysteretic control with tightly regulated top/bottom current limits. Its internal architecture minimizes switching noise, and adding a 22pF phase-lead capacitor from FB to VOUT further reduces comparator delay-induced ripple.
Can the LT3470ETS8#TRMPBF be used in AEC-Q100 compliant automotive designs?
Yes-the LT3470ETS8#TRMPBF is explicitly listed as AEC-Q100 qualified for automotive applications in the Features section and Order Information table. It meets stress test requirements for temperature cycling, humidity, and vibration when used within its –40°C to +85°C operating range.
LT3470ETS8#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT3470ETS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470ETS8#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 LT3470ETS8#TRMPBF reliable?
The price and inventory of LT3470ETS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470ETS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470ETS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470ETS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470ETS8#TRMPBF?
LT3470ETS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470ETS8#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 LT3470ETS8#TRMPBF?
For technical support, including LT3470ETS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470ETS8#TRMPBF requirements.
6.How does Aetrix verify that LT3470ETS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470ETS8#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 LT3470ETS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470ETS8#TRMPBF?
All LT3470ETS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470ETS8#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 LT3470ETS8#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470ETS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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