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Analog Devices Inc. LT3470ITS8#TRPBF
- Part No.:
- LT3470ITS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3470ITS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
LT3470ITS8#TRPBF from Analog Devices is a micropower step-down DC/DC converter with integrated 300mA bipolar NPN switch, catch diode, and boost diode in an 8-lead TSOT-23 package. It delivers up to 200mA output current with 26µA quiescent current at 12VIN→3.3VOUT, <10mV output ripple, and operates from 4V to 40V input-enabling use in automotive battery regulation and portable industrial supplies.
For engineers reviewing the LT3470ITS8#TRPBF datasheet, LT3470ITS8#TRPBF pinout, LT3470ITS8#TRPBF application, or LT3470ITS8#TRPBF equivalent, key selection factors include its hysteretic/Burst Mode control architecture, AEC-Q100 qualification for automotive grade (–40°C to 125°C), integrated diodes eliminating external components, and thermal performance in the 1mm-thin TSOT-23 package.
Technical Context
The LT3470ITS8#TRPBF uses a hysteretic control scheme with dual current comparators and an RS latch to regulate output voltage by dynamically adjusting switching frequency based on load, inductor value, and input/output voltage. It alternates between Burst Mode (micropower, low-ripple operation at light loads) and continuous conduction mode (CCM) at higher loads-enabling stable regulation without external compensation.
Its internal bipolar NPN power switch requires a BOOST voltage >2.5V above SW to ensure full saturation; this is generated via an external 0.22µF capacitor and internal Schottky diode. The BIAS pin connects to VOUT when VOUT > 2V, supplying bias current to the internal regulator only when VBIAS > 3V-reducing quiescent current to <1µA in shutdown.
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 - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Quiescent Current | 26µA at 12VIN→3.3VOUT - enables multi-year battery life in always-on monitoring applications. |
| Output Ripple | <10mV - achieved via Burst Mode + small inductor/capacitor solution, reducing need for post-regulation LDOs. |
| Shutdown Current | <1µA - disconnects load from input source, simplifying power sequencing in battery-powered systems. |
| Feedback Reference | 1.25V ±1.7% - sets output voltage via external resistor divider (VOUT = 1.25V × (1 + R1/R2)), enabling adjustable outputs from 1.25V to 16V. |
| Operating Temp | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for under-hood automotive and industrial environments. |
Pinout & Package
LT3470ITS8#TRPBF is housed in an 8-lead plastic TSOT-23 package (1mm height, 3mm × 1.75mm footprint) with θJA = 140°C/W. Exposed pad is not present in TSOT-23 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pull ≥2.5V for operation; tie to GND for <1µA shutdown - no external pull-up required if tied to VIN. |
| NC (Pin 2) | No-connect terminal | May be left floating or connected to VIN - no electrical function; avoids unintended coupling in high-noise layouts. |
| 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 ground reference | Return path for switch, catch diode, and feedback divider - must connect to single-point local ground plane beneath IC. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; carries high di/dt - requires minimal trace length and tight loop with input/output capacitors. |
| BOOST (Pin 6) | Boost capacitor connection | Provides >VIN drive voltage to saturate internal NPN switch; requires 0.22µF capacitor to SW for proper startup and efficiency. |
| BIAS (Pin 7) | Bias supply input | Tie to VOUT if >2V (enables low-IQ operation); ties internal regulator to output rail, reducing VIN current draw. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; connects to resistor divider - sets output voltage and enables remote sensing when routed carefully away from SW/BOOST. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + Burst Mode control | Enables automatic transition between ultra-low-IQ micropower state and continuous switching - eliminates external compensation while maintaining <10mV ripple. |
| Integrated boost and catch diodes | Removes two external Schottky diodes - reduces BOM count, PCB area (<50mm² total solution), and layout sensitivity to parasitic inductance. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with automotive reliability testing - supports direct integration into ADAS sensors and body control modules. |
| Fast current limiting & short-circuit protection | Top/bottom current limits (250–435mA / 225mA) and 500ns minimum off-time prevent switch damage during output shorts - functional up to 40V input. |
| Thermally enhanced TSOT-23 | 1mm profile with 140°C/W junction-to-ambient thermal resistance - enables high-power-density designs in thin-profile portable and automotive enclosures. |
Applications
| Automotive Battery Regulation | Portable Industrial Sensors |
|---|---|
Use Scenario: Regulating 12V automotive battery (9–16V nominal, up to 40V transients) to 3.3V for CAN transceivers and microcontrollers in engine control units. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-sensitive power with fast transient response to load steps during ignition events. Use Value: AEC-Q100 qualification ensures reliability across temperature extremes; 40V absolute max rating withstands load-dump transients without external TVS clamping. | Use Scenario: Powering wireless sensor nodes (e.g., vibration, temperature) in factory automation systems powered by 24V DC rails or 9V batteries. IC Role / Device Role / Timing Role: Micropower step-down converter enabling multi-year battery life while supporting periodic RF transmission bursts requiring 200mA peak current. Use Value: 26µA quiescent current extends battery life; integrated diodes eliminate layout-sensitive external components critical for ruggedized field-deployed hardware. |
| Distributed Supply Regulation | Wall Transformer Regulation |
Use Scenario: Local point-of-load regulation on PCBs with multiple subsystems (e.g., analog front-end, digital logic, communication ICs) fed from a shared 12V or 24V intermediate bus. IC Role / Device Role / Timing Role: Compact, self-contained buck stage delivering clean, low-noise 5V or 3.3V to noise-sensitive analog circuits without cross-talk from adjacent digital sections. Use Value: Small 50mm² solution size minimizes board area; <10mV output ripple reduces need for secondary LDO filtering in precision signal chains. | Use Scenario: Converting unregulated 9–24V AC/DC wall adapter outputs to stable 5V for USB peripherals or embedded controllers in consumer and medical devices. IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling wide line variations and brown-out conditions without external supervision circuitry. Use Value: 4V undervoltage lockout prevents erratic behavior during adapter plug-in/out; 40V rating accommodates poor-quality adapters with high ripple or overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471ITS8#TRPBF | Same pinout, 300mA switch, but fixed 3.3V output (non-adjustable FB); 22µA IQ; no BIAS pin. | Suitable only where fixed 3.3V output is acceptable; lacks adjustable VOUT and BIAS-driven efficiency optimization. | Select LT3471ITS8#TRPBF only for cost-sensitive, fixed-output designs where programmability and lowest IQ are secondary to simplicity. |
| TPS62231DRYR | 3MHz synchronous buck, 300mA, 17µA IQ, but requires external MOSFETs; no integrated diodes; 2.05–6.5V input range. | Cannot replace LT3470ITS8#TRPBF in 4–40V input or diode-integrated applications; limited to lower-voltage rails. | Choose TPS62231DRYR only for compact, high-frequency designs with input <6.5V and where external FETs are acceptable for thermal management. |
Compared with LT3470ITS8#TRPBF, LT3471ITS8#TRPBF trades adjustability and BIAS optimization for slightly lower quiescent current and fixed-output simplicity, while TPS62231DRYR offers higher switching frequency and synchronous rectification but lacks high-input-voltage capability and integrated diodes-making LT3470ITS8#TRPBF uniquely suited for wide-input, space-constrained, diode-free buck applications.
Availability
LT3470ITS8#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable industrial sensors, and distributed supply regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3470ITS8#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.
The LT3470ITS8#TRPBF belongs to Analog Devices' micropower DC/DC converter product line, designed specifically for space- and power-constrained applications requiring wide input voltage tolerance, ultra-low quiescent current, and integrated power components.
FAQ
What is the maximum input voltage rating for the LT3470ITS8#TRPBF?
The LT3470ITS8#TRPBF has an absolute maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. This allows it to safely operate across automotive battery transients (e.g., load dump) and unregulated wall transformer outputs without external clamping. Operation above 40V risks permanent device damage and is strictly prohibited.
Does the LT3470ITS8#TRPBF require external diodes for boost or catch functions?
No, the LT3470ITS8#TRPBF integrates both the boost Schottky diode and catch Schottky diode internally. This eliminates the need for two external diodes, reducing bill-of-materials count, PCB area, and layout sensitivity-key advantages over discrete buck controller solutions.
What is the operating temperature range for the LT3470ITS8#TRPBF?
The LT3470ITS8#TRPBF is rated for operation from –40°C to +125°C and is AEC-Q100 qualified for automotive Grade I applications. This makes it suitable for under-hood automotive electronics, industrial controls, and other harsh-environment deployments where extended thermal performance is required.
How does the LT3470ITS8#TRPBF achieve low output ripple at light loads?
The LT3470ITS8#TRPBF achieves <10mV output ripple at light loads through Burst Mode® operation: it enters micropower state between switching bursts, minimizing energy loss and ripple generation. Combined with hysteretic control and optimized external LC components, this delivers low-noise regulation without requiring post-regulation LDOs.
Can the LT3470ITS8#TRPBF be used with output voltages below 1.25V?
No, the LT3470ITS8#TRPBF cannot regulate output voltages below its internal 1.25V feedback reference voltage. Its minimum output is 1.25V (achieved with R2 only, R1 = 0). For lower outputs, a different regulator with adjustable reference or dedicated low-VOUT design is required.
LT3470ITS8#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LT3470ITS8#TRPBF FAQ
1.How can I place an order for LT3470ITS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470ITS8#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 LT3470ITS8#TRPBF reliable?
The price and inventory of LT3470ITS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470ITS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3470ITS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470ITS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470ITS8#TRPBF?
LT3470ITS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470ITS8#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 LT3470ITS8#TRPBF?
For technical support, including LT3470ITS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470ITS8#TRPBF requirements.
6.How does Aetrix verify that LT3470ITS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3470ITS8#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 LT3470ITS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3470ITS8#TRPBF?
All LT3470ITS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470ITS8#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 LT3470ITS8#TRPBF part is unused and in its original packaging.
Return procedure for LT3470ITS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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