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Analog Devices Inc. LT3470HTS8#TRMPBF
- Part No.:
- LT3470HTS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3470HTS8#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
LT3470HTS8#TRMPBF from Analog Devices is a micropower buck regulator IC with integrated boost and catch Schottky diodes, 300mA bipolar NPN switch, and hysteretic/Burst Mode® control. It delivers up to 200mA at output voltages from 1.25V to 16V from a 4V–40V input, achieves <10mV output ripple, and draws only 26µA quiescent current at 12VIN→3.3VOUT. It is used in automotive battery regulation and industrial distributed supplies requiring high input voltage tolerance and ultra-low standby power.
For engineers reviewing the LT3470HTS8#TRMPBF datasheet, LT3470HTS8#TRMPBF pinout, LT3470HTS8#TRMPBF application, or LT3470HTS8#TRMPBF equivalent, this page provides verified package mapping (8-lead TSOT-23), confirmed thermal rating (–40°C to 150°C), validated pin functions (SW, BOOST, FB, SHDN, etc.), and real-world design constraints including minimum off-time (500ns), switch VCE(SAT) (215mV @ 100mA), and BIAS pin sourcing behavior.
Technical Context
The LT3470HTS8#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, inductor value, and input/output voltage - eliminating need for external compensation. Its Burst Mode® operation enables micropower state at light loads while maintaining low ripple via controlled pulse skipping.
It integrates a bipolar NPN power switch driven either from VIN or a charge-pumped BOOST voltage (≥2.5V above SW), enabling full saturation even at high input voltages. The internal catch and boost Schottky diodes are rated for 100mA forward current (630mV drop) and ≤2µA reverse leakage at 10V, supporting robust short-circuit protection up to 40V input when paired with ≥33µH inductors.
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 maximum - 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. |
| Shutdown Current | <1µA - disconnects load from input source, simplifying power sequencing in battery-powered designs. |
| Feedback Reference | 1.25V ±1.8% - sets output via external resistor divider; line regulation is 0.01%/V for stable output across wide input range. |
| Switch Top Current Limit | 250–435mA - programmable via FB pin voltage; enables precise overcurrent protection without external sensing. |
| Minimum Off-Time | 500ns - constrains minimum achievable duty cycle; critical for stable operation at high VIN/VOUT ratios. |
Pinout & Package
LT3470HTS8#TRMPBF 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 | Logic-high ≥2.5V enables regulation; grounded forces shutdown with <1µA VIN current - used for system-level power gating. |
| NC (Pin 2) | No-connect terminal | May be left floating or tied to VIN; no internal connection - avoids unintended biasing of adjacent pins. |
| VIN (Pin 3) | Main power input | Supplies internal regulator and power switch; requires local 1–2.2µF ceramic bypass to minimize EMI and input ripple. |
| GND (Pin 4) | Power and signal reference | Return path for switch, feedback divider, and internal circuits; must connect to single-point ground plane to avoid noise coupling. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; carries high di/dt pulses - trace must be short and wide to reduce EMI and voltage spikes. |
| BOOST (Pin 6) | Charge-pump drive node | Connects to boost capacitor (0.22µF); voltage ≥2.5V above SW ensures full NPN switch saturation for low VCE(SAT). |
| BIAS (Pin 7) | Bias supply selector | Tied to VOUT if >2V (enables BIAS pin sourcing); otherwise tied to VIN - determines internal regulator operating point and efficiency. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; sets output via R1/R2 divider; sensitive node - must be routed away from SW/BOOST to prevent instability. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + Burst Mode® control | Enables continuous switching at heavy loads and micropower pulse-skipping at light loads - eliminates external compensation while maintaining <10mV ripple. |
| Integrated boost and catch Schottky diodes | Reduces solution size to ~50mm² and removes two external components; 630mV forward drop at 100mA ensures efficiency >85% at 200mA. |
| AEC-Q100 qualified (H-grade) | Rated for –40°C to 150°C junction temperature - validated for under-hood automotive applications including battery regulation and ADAS power rails. |
| Fast current limiting & short-circuit protection | Top/bottom current comparators respond within 500ns off-time limit - protects switch and inductor during 40V input fault conditions without external circuitry. |
| Thermally enhanced TSOT-23 package | θJA = 140°C/W enables 200mA operation without heatsink in ambient up to 85°C - suitable for compact industrial modules. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V/5V for infotainment MCU and CAN transceivers under cold-crank (4.5V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated protection - handles wide input transients without external TVS or LDO pre-regulator. Use Value: Eliminates need for external boost diode and catch diode; AEC-Q100 H-grade ensures reliability at 150°C junction during prolonged engine-off parking mode. |
Use Scenario: Powering isolated sensor nodes and PLC I/O modules from unregulated 24V industrial rails subject to brownouts and surges. IC Role / Device Role / Timing Role: Standalone micropower buck converter - maintains regulation down to 4V input while drawing only 26µA quiescent current during idle periods. Use Value: Enables >10-year battery backup life in wireless sensor gateways; 500ns minimum off-time prevents instability during rapid input voltage recovery. |
| Portable Medical Instrumentation | Wall Transformer-Fed IoT Hub |
Use Scenario: Generating 3.3V from dual-cell Li-ion (6–8.4V) for portable ECG monitors with strict EMI and battery-life requirements. IC Role / Device Role / Timing Role: Efficient, low-noise power stage - Burst Mode® operation minimizes audible ceramic capacitor noise while maintaining tight output regulation. Use Value: 200mA output supports BLE radio bursts; integrated diodes reduce BOM count and PCB area - critical for handheld form factors. |
Use Scenario: Converting 9–12V from low-cost wall adapters to stable 5V for Wi-Fi SoCs and USB peripherals in smart home hubs. IC Role / Device Role / Timing Role: Primary DC/DC regulator - accepts wide-input, unregulated sources and delivers low-ripple output without complex feedback loop tuning. Use Value: 40V absolute max rating tolerates adapter overvoltage faults; <10mV ripple meets USB-IF conducted noise limits without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471ETS8#TRMPBF | Same architecture but E-grade (–40°C to 85°C); 35µA quiescent current vs. 26µA; no AEC-Q100 qualification. | Not suitable for under-hood automotive use; acceptable for commercial portable devices with lower ambient temp. | Select LT3471ETS8#TRMPBF only if thermal grade and automotive qualification are unnecessary and cost is primary constraint. |
| LMR14020SQDDARQ1 | 40V, 2A buck with integrated MOSFETs; 40µA quiescent current; requires external compensation; no integrated boost/catch diodes. | Higher current capability but larger solution size; lacks Burst Mode® - higher light-load ripple and less optimal for micropower sleep modes. | Choose LMR14020SQDDARQ1 only when >200mA output or automotive AEC-Q100 Grade 1 (–40°C to 125°C) is required - not a drop-in replacement. |
Compared with LT3470HTS8#TRMPBF, LT3471ETS8#TRMPBF trades thermal robustness and quiescent performance for lower cost, while LMR14020SQDDARQ1 offers higher current and different control architecture at the expense of solution size and micropower efficiency - neither is pin-compatible or functionally identical.
Availability
LT3470HTS8#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, portable medical instrumentation, and wall transformer-fed IoT hub applications requiring stable component supply across extended temperature ranges.
Supply support for LT3470HTS8#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 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 power train components - designed specifically for space- and energy-constrained systems in automotive, industrial, and portable markets where reliability across extreme temperatures is essential.
FAQ
What is the maximum junction temperature rating for LT3470HTS8#TRMPBF?
The LT3470HTS8#TRMPBF is rated for a maximum junction temperature of 150°C, as specified in its H-grade qualification. This allows reliable operation in under-hood automotive environments and high-ambient industrial settings. Derating curves in the datasheet confirm guaranteed performance across –40°C to 150°C, with θJA = 140°C/W in the TSOT-23 package.
Does LT3470HTS8#TRMPBF require an external catch diode?
No, the LT3470HTS8#TRMPBF integrates a catch Schottky diode rated for 100mA forward current and 630mV drop at 100mA. This eliminates the need for an external diode, reducing solution size and BOM count. The internal diode is thermally coupled to the die and shares the same thermal limits as the IC itself.
How does the BOOST pin function in LT3470HTS8#TRMPBF?
In the LT3470HTS8#TRMPBF, the BOOST pin connects to an external 0.22µF capacitor between BOOST and SW to generate a voltage ≥2.5V above SW. This elevated voltage drives the base of the internal bipolar NPN switch, ensuring full saturation and low VCE(SAT) (215mV) even at high input voltages - critical for efficiency above 24V input.
Can LT3470HTS8#TRMPBF operate with a 3.3V output from a 5V input?
Yes, the LT3470HTS8#TRMPBF can regulate 3.3V from 5V input, but minimum input voltage depends on load and boost circuit configuration. At 200mA, Figure 3 shows minimum VIN ≈ 4.5V for reliable startup and regulation. Below that, undervoltage lockout (4V) or insufficient boost capacitor charge may prevent operation.
Is LT3470HTS8#TRMPBF pin-compatible with other LT3470 variants in TSOT-23?
Yes, all LT3470 variants in the TSOT-23 package - including LT3470ETS8#TRMPBF, LT3470ITS8#TRMPBF, and LT3470HTS8#TRMPBF - share identical pinout, footprint, and electrical interface. Only the temperature grade and marking differ; no PCB redesign is needed when upgrading from E/I to H grade.
LT3470HTS8#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LT3470HTS8#TRMPBF FAQ
1.How can I place an order for LT3470HTS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470HTS8#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 LT3470HTS8#TRMPBF reliable?
The price and inventory of LT3470HTS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470HTS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470HTS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470HTS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470HTS8#TRMPBF?
LT3470HTS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470HTS8#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 LT3470HTS8#TRMPBF?
For technical support, including LT3470HTS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470HTS8#TRMPBF requirements.
6.How does Aetrix verify that LT3470HTS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470HTS8#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 LT3470HTS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470HTS8#TRMPBF?
All LT3470HTS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470HTS8#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 LT3470HTS8#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470HTS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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