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Analog Devices Inc. LT3470HTS8#TRPBF
- Part No.:
- LT3470HTS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3470HTS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3470HTS8#TRPBF from Analog Devices is a micropower buck regulator IC with integrated boost and catch Schottky diodes, 300mA internal bipolar NPN switch, hysteretic control, and Burst Mode® operation. It delivers up to 200mA at output voltages from 1.25V to 16V across a 4V–40V input range, achieving <10mV output ripple and 26µA quiescent current - ideal for automotive battery regulation and portable power supplies.
For engineers reviewing the LT3470HTS8#TRPBF datasheet, LT3470HTS8#TRPBF pinout, LT3470HTS8#TRPBF application, or LT3470HTS8#TRPBF equivalent, this page provides verified technical context, package-specific pin functions, real-world application constraints (e.g., minimum inductor sizing, BOOST voltage requirements), and validated alternative options for AEC-Q100-compliant designs.
Technical Context
The LT3470HTS8#TRPBF uses a hysteretic control architecture with dual current comparators and an RS latch to regulate via top/bottom switch current limits (250–435mA/225mA), enabling automatic transition between Burst Mode® (low-load, low-ripple) and continuous switching (higher loads). Its internal bipolar NPN switch requires BOOST voltage >2.5V above SW for full saturation, supplied via external 0.22µF capacitor and integrated Schottky diode.
It features undervoltage lockout at 4V, shutdown current <1µA, and operates over –40°C to +150°C (H-grade). The BIAS pin must be tied to VOUT if VOUT > 2V or to VIN otherwise, and the exposed pad is not present in TS8 - unlike DD packages - confirming its 8-lead TSOT-23 thermal profile (θJA = 140°C/W).
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 maximum - limited by hysteretic current thresholds and thermal design in TSOT-23 package. |
| Quiescent Current | 26µA at 12VIN/3.3VOUT - enables multi-year battery life in always-on sensor nodes. |
| Shutdown Current | <1µA - disconnects load from input, simplifying power sequencing in automotive modules. |
| FB Reference Voltage | 1.25V (±1.7%) - sets output via external resistor divider; line regulation 0.01%/V ensures stability across wide VIN. |
| Switch VCE(SAT) | 215mV at 100mA (TS8) - low conduction loss improves efficiency at mid-load, critical for thermally constrained layouts. |
| Output Ripple | <10mV peak-to-peak - achieved with proper ceramic output cap (e.g., 22µF X5R) and 22pF phase-lead compensation. |
| Operating Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
Pinout & Package
LT3470HTS8#TRPBF uses an 8-lead Plastic TSOT-23 package (3mm × 1.75mm × 0.9mm), thermally enhanced with θJA = 140°C/W. No exposed pad - ground connection is via Pin 4 only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Logic-high ≥2.5V enables regulation; grounded forces <1µA shutdown - tie to VIN if unused. |
| NC (Pin 2) | No-connect terminal | May be left floating or tied to VIN; no internal connection - avoid routing sensitive signals nearby. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and switch; requires local 1–2.2µF ceramic bypass near pin. |
| GND (Pin 4) | Power and signal reference | Single-point return for FB divider, input/output caps, and inductor - critical for EMI control. |
| SW (Pin 5) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor - high dv/dt node; minimize trace area. |
| BOOST (Pin 6) | Boost drive supply | Accepts charge-pump voltage ≥2.5V above SW to saturate internal NPN switch - use 0.22µF ceramic. |
| BIAS (Pin 7) | Bias supply selector | Tie to VOUT if VOUT > 2V (enables bias current sourcing); else tie to VIN - determines regulator operating mode. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; connects to resistor divider tap - keep trace short/shielded from SW/BOOST to prevent oscillation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diodes | Eliminates two external components (boost + catch), reducing solution size to ≤50mm² and assembly cost. |
| Hysteretic + Burst Mode® control | Enables automatic mode switching - maintains <10mV ripple at light loads while avoiding subharmonic instability. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood use (–40°C to +150°C), including HTOL, temperature cycling, and ESD testing. |
| 4V UVLO with 40V absolute max VIN | Protects against brownout while supporting wide-input industrial and transportation power rails. |
| Fast current limiting & short-circuit protection | Top/bottom current comparators and 500ns minimum off-time prevent switch failure during 40V output shorts. |
| Thermally optimized TSOT-23 | θJA = 140°C/W enables 200mA output without heatsink in compact PCB layouts - verified per JEDEC JESD51-7. |
Applications
| Automotive Battery Regulation | Portable Medical Instrument Power |
|---|---|
Use Scenario: Regulating 12V vehicle battery (9–16V nominal, up to 40V load dump) to 3.3V/5V for CAN transceivers and microcontrollers. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated diodes and AEC-Q100 qualification - handles transient overvoltage without external TVS. Use Value: Eliminates need for external boost/catch diodes and reduces BOM count by 2, while maintaining 26µA quiescent current for ECU sleep-mode compliance. |
Use Scenario: Powering handheld glucose meters and pulse oximeters from single 3.7V Li-ion cells with strict battery-life requirements. IC Role / Device Role / Timing Role: Micropower buck converter delivering stable 3.3V at ≤200mA - operates down to 4V input, extending usable battery range. Use Value: 26µA quiescent current enables >5-year shelf life in standby; Burst Mode® ensures low-noise analog sensing during active measurement. |
| Distributed Industrial Sensor Supply | Wall Adapter-Fed IoT Gateway |
Use Scenario: Providing isolated 5V rail from 24V factory bus to remote temperature/humidity sensors with 4–20mA loop interfaces. IC Role / Device Role / Timing Role: Compact, high-input buck regulator on sensor node PCB - withstands 40V surges per IEC 61000-4-5 Level 3. Use Value: 40V absolute max rating and fast current limiting enable direct connection to 24V bus without pre-regulator - reduces system footprint by 30%. |
Use Scenario: Converting unregulated 9–12V wall adapter output to clean 3.3V for Wi-Fi/BLE SoCs in smart home hubs. IC Role / Device Role / Timing Role: Primary point-of-load regulator with low EMI due to fixed-frequency-avoiding hysteretic control. Use Value: <10mV output ripple and 50mm² solution size meet FCC Class B emissions limits without shielding - accelerates EMC certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8607EMSE#TRPBF | Synchronous 2.5A buck; 2.8V–30V input; 2.5µA IQ; requires external MOSFETs | Higher current, lower IQ, but larger solution size and no integrated diodes | Choose for >500mA loads or ultra-low IQ needs; not drop-in - redesign required. |
| TPS62840DGRR | 1.8V–6.5V input; 1A output; 250nA IQ; synchronous; QFN-8 package | Narrower input range, higher current, but lacks 40V tolerance and AEC-Q100 qualification | Prefer for battery-powered wearables; unsuitable for automotive or industrial 24V/48V rails. |
Compared with LT3470HTS8#TRPBF, LT8607EMSE#TRPBF offers higher current and lower IQ but demands layout changes and external FETs, while TPS62840DGRR excels in nanoscale battery apps but cannot replace LT3470HTS8#TRPBF in 40V automotive or industrial settings due to input voltage and qualification gaps.
Availability
LT3470HTS8#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical instrumentation, distributed industrial sensor supply, and wall adapter-fed IoT gateway applications requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LT3470HTS8#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The LT3470 product line delivers micropower, wide-input buck regulators with integrated diodes and AEC-Q100 qualification - designed specifically for space-constrained, high-reliability automotive and industrial power systems.
FAQ
What is the maximum input voltage rating for the LT3470HTS8#TRPBF?
The LT3470HTS8#TRPBF has an absolute maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. For reliable long-term use, design margins should maintain VIN ≤36V under worst-case transients such as load dump in automotive systems. The device's 4V undervoltage lockout also ensures safe startup only when sufficient input is present.
Does the LT3470HTS8#TRPBF require an external catch diode?
No, the LT3470HTS8#TRPBF integrates a catch Schottky diode internally - confirmed in the FEATURES section ("Integrated Boost and Catch Diodes") and BLOCK DIAGRAM. This eliminates the need for an external diode, reducing solution size and BOM count. The datasheet specifies catch diode forward voltage (630mV at 100mA) and reverse leakage (0.2µA at 10V), verifying its functional integration.
What is the purpose of the BIAS pin on the LT3470HTS8#TRPBF?
The BIAS pin on the LT3470HTS8#TRPBF selects the internal regulator's power source: tie to VOUT if VOUT > 2V (enabling bias current sourcing from output), or to VIN otherwise. When VBIAS > 3V, it supplies current to the internal regulator - improving efficiency and reducing VIN quiescent current. This dual-source capability optimizes performance across input/output voltage combinations.
Can the LT3470HTS8#TRPBF operate in Burst Mode® at all load conditions?
No - the LT3470HTS8#TRPBF automatically transitions between Burst Mode® (at light loads) and continuous conduction mode (at higher loads), as described in the DESCRIPTION and OPERATION sections. Burst Mode® minimizes quiescent current and ripple below ~10mA, while continuous mode engages above that threshold to maintain regulation without audible noise or output deviation.
Is the LT3470HTS8#TRPBF pin-compatible with other LT3470 variants like LT3470ETS8#TRPBF?
Yes - all LT3470 TSOT-23 variants (including LT3470HTS8#TRPBF, LT3470ETS8#TRPBF, and LT3470ITS8#TRPBF) share identical pinout, package dimensions, and electrical interface. Differences are limited to guaranteed operating temperature range (–40°C to +150°C for H-grade) and AEC-Q100 qualification - no PCB or schematic changes are needed when upgrading from E- or I-grade to H-grade.
LT3470HTS8#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LT3470HTS8#TRPBF FAQ
1.How can I place an order for LT3470HTS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470HTS8#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 LT3470HTS8#TRPBF reliable?
The price and inventory of LT3470HTS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470HTS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3470HTS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470HTS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470HTS8#TRPBF?
LT3470HTS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470HTS8#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 LT3470HTS8#TRPBF?
For technical support, including LT3470HTS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470HTS8#TRPBF requirements.
6.How does Aetrix verify that LT3470HTS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3470HTS8#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 LT3470HTS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3470HTS8#TRPBF?
All LT3470HTS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470HTS8#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 LT3470HTS8#TRPBF part is unused and in its original packaging.
Return procedure for LT3470HTS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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