My Inquiry
My Account
Analog Devices Inc. LT3470ITS8#TRMPBF
- Part No.:
- LT3470ITS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3470ITS8#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 200MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,479
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3470ITS8#TRMPBF from Analog Devices is a micropower step-down DC/DC converter with integrated 300mA bipolar NPN power 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 across 4V–40V input range-ideal for automotive battery regulation and portable industrial sensors.
For engineers reviewing the LT3470ITS8#TRMPBF datasheet, LT3470ITS8#TRMPBF pinout, LT3470ITS8#TRMPBF application, or LT3470ITS8#TRMPBF equivalent, key selection criteria include its hysteretic control architecture, AEC-Q100 qualification (–40°C to 125°C), integrated diodes eliminating external components, and Burst Mode® operation enabling ultra-low-noise micropower performance at light loads.
Technical Context
The LT3470ITS8#TRMPBF uses a hysteretic control scheme with dual current comparators and an RS latch to regulate output voltage by dynamically adjusting switching frequency based on inductor value, input/output voltage, and load. Its top/bottom current limits (250–435mA / 225mA) are temperature-compensated and servoed to maintain FB = 1.25V.
Startup relies on a charge-pump boost circuit: a 0.22µF capacitor between BOOST and SW generates >2.5V over SW to fully saturate the internal bipolar switch; BIAS pin connects to VOUT when >2V or VIN otherwise, supplying bias current only when VBIAS > 3V.
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 - sufficient for powering microcontrollers, sensors, and RF modules in space-constrained designs. |
| Quiescent Current | 26µA at 12VIN→3.3VOUT - enables multi-year battery life in always-on IoT endpoints. |
| Shutdown Current | <1µA - disconnects load from input, simplifying power sequencing in battery-backed systems. |
| Feedback Reference | 1.25V ±1.8% - sets output via external resistor divider (VOUT = 1.25V × (1 + R1/R2)), stable over –40°C to 125°C. |
| Switch VCE(SAT) | 215mV at 100mA (TS8 package) - minimizes conduction loss and thermal rise in compact layouts. |
| Output Ripple | <10mV peak-to-peak - achieved with small ceramic output caps and optional 22pF phase-lead compensation. |
Pinout & Package
LT3470ITS8#TRMPBF is housed in an 8-lead plastic TSOT-23 package (3mm × 1.75mm × 0.9mm), thermally enhanced 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 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-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 cap to suppress high-di/dt noise. |
| GND (Pin 4) | Power and signal reference | Must connect to low-impedance ground plane; feedback divider return and PCB thermal path originate here. |
| SW (Pin 5) | Switch node | Drives external inductor and catch diode; high dv/dt node requiring minimized trace area to reduce EMI. |
| BOOST (Pin 6) | Charge-pump drive output | Connects to 0.22µF capacitor; supplies >VIN voltage to saturate internal bipolar switch for low VCE(SAT). |
| BIAS (Pin 7) | Bias supply selector | Tied to VOUT if >2V (enables efficient bias current sourcing); else tied to VIN for startup under low-VOUT conditions. |
| FB (Pin 8) | Feedback input | Regulated to 1.25V; connects to resistor divider midpoint-small node area critical to avoid coupling from SW/BOOST. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + Burst Mode® control | Enables automatic transition between continuous switching (high load) and micropower burst pulses (light load), maintaining <10mV ripple without external compensation. |
| Integrated boost and catch Schottky diodes | Eliminates two external diodes and associated layout area-reducing solution size to as small as 50mm² with 33µH inductor and 22µF output cap. |
| AEC-Q100 qualified (I-grade) | Rated for –40°C to +125°C ambient operation with full parameter guarantees-validated for automotive body electronics and ADAS sensor supplies. |
| Fast current limiting & short-circuit protection | Top current limit of 250–435mA and minimum off-time of 500ns prevent switch overstress during 40V input faults or output shorts. |
| Low-profile TSOT-23 packaging | 0.9mm max height enables use in ultra-thin portable devices and stacked PCB assemblies where DFN thickness is prohibitive. |
Applications
| Automotive Battery Regulation | Portable Industrial Sensors |
|---|---|
|
Use Scenario: Powering CAN transceivers and microcontrollers from 12V vehicle battery with wide input variation (9V–16V) and cold-crank dips to 4V. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/200mA with <1µA shutdown current to preserve battery during ignition-off periods. Use Value: AEC-Q100 qualification ensures reliability across temperature extremes; integrated diodes eliminate failure-prone external components in vibration-prone environments. |
Use Scenario: Supplying ultra-low-power gas sensors and wireless transmitters in battery-operated field instruments with 10+ year service life. IC Role / Device Role / Timing Role: Micropower DC/DC converter maintaining regulated 5V output while drawing only 26µA quiescent current from primary Li-SOCl₂ cell. Use Value: Burst Mode® operation extends battery life by minimizing switching losses at µA-level loads; small TSOT-23 footprint fits within tight enclosure constraints. |
| Distributed Supply Regulation | Wall Transformer Regulation |
|
Use Scenario: Local point-of-load conversion in multi-rail embedded systems where 24V backplane must feed isolated 3.3V/5V rails for FPGA I/O and analog front-ends. IC Role / Device Role / Timing Role: Secondary buck stage providing low-noise, fast-transient 5V supply with <10mV ripple-immune to upstream rail disturbances. Use Value: Hysteretic control delivers immediate response to load steps without loop compensation; integrated diodes simplify BOM and improve MTBF. |
Use Scenario: Regulating unregulated 9–24V AC/DC wall adapters into clean 3.3V for USB-powered peripherals and smart home hubs. IC Role / Device Role / Timing Role: Input-tolerant buck converter accepting wide-input, high-noise adapter outputs while rejecting line-frequency ripple. Use Value: 40V absolute maximum input rating withstands adapter surge transients; low EMI layout guidance ensures FCC/CE compliance without shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3471ITS8#TRMPBF | Higher 400mA output current; identical pinout and control architecture but larger switch and diodes. | Suitable for 300mA loads (e.g., motor drivers) where LT3470ITS8#TRMPBF would operate near thermal limit. | Select LT3471ITS8#TRMPBF only if sustained >200mA load current or higher transient headroom is required. |
| TPS62130ARGTR | Synchronous buck (vs. LT3470ITS8#TRMPBF's asynchronous topology); 3.6V–17V input; 3A output; requires external inductor. | Better efficiency above 100mA but lacks integrated diodes and AEC-Q100 qualification; not suitable for 40V input or automotive temp range. | Choose TPS62130ARGTR for high-efficiency, high-current non-automotive applications where board space allows external magnetics. |
Compared with LT3470ITS8#TRMPBF, LT3471ITS8#TRMPBF offers higher current capability in identical form factor, while TPS62130ARGTR trades integration and ruggedness for raw efficiency and output current-making LT3470ITS8#TRMPBF optimal for space-, reliability-, and input-voltage–constrained designs.
Availability
LT3470ITS8#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable industrial sensors, distributed supply regulation, and wall transformer regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3470ITS8#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 precision instrumentation, industrial automation, and automotive markets since 1965.
The LT3470ITS8#TRMPBF belongs to Analog Devices' micropower DC/DC converter product line, engineered specifically for ultra-low-quiescent-current, high-input-voltage regulation in space- and reliability-critical applications such as automotive subsystems and remote sensing nodes.
FAQ
What is the operating temperature range for the LT3470ITS8#TRMPBF?
The LT3470ITS8#TRMPBF is rated for –40°C to +125°C ambient operation, with full electrical specifications guaranteed across this range. This I-grade qualification meets AEC-Q100 requirements for automotive under-hood and body electronics applications, and supports industrial deployments in harsh thermal environments without derating.
Does the LT3470ITS8#TRMPBF require external diodes?
No-the LT3470ITS8#TRMPBF integrates both the catch Schottky diode and boost Schottky diode internally. This eliminates two external components, reduces PCB area, improves reliability, and simplifies design. External diodes are never required, though the BOOST capacitor (0.22µF) and feedback resistors remain necessary.
How does the LT3470ITS8#TRMPBF achieve low output ripple?
The LT3470ITS8#TRMPBF achieves <10mV peak-to-peak output ripple through combined Burst Mode® operation at light loads and hysteretic control at higher loads, plus optimized internal compensation. Adding a 22pF phase-lead capacitor from FB to VOUT further reduces comparator delay-induced ripple without external loop components.
Can the LT3470ITS8#TRMPBF operate from a 40V input source?
Yes-the LT3470ITS8#TRMPBF has an absolute maximum input rating of 40V and is designed for direct connection to unregulated sources like lead-acid batteries and industrial 24V/36V rails. Fast current limiting and 500ns minimum off-time protect the internal switch during fault conditions at full 40V input.
What is the purpose of the BIAS pin on the LT3470ITS8#TRMPBF?
The BIAS pin on the LT3470ITS8#TRMPBF selects the bias supply source: it connects to VOUT when output voltage exceeds 2V (enabling efficient current sourcing from regulated rail), or to VIN otherwise (ensuring reliable startup at low VOUT). This dual-path design optimizes quiescent current and startup behavior across output voltage configurations.
LT3470ITS8#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LT3470ITS8#TRMPBF FAQ
1.How can I place an order for LT3470ITS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3470ITS8#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 LT3470ITS8#TRMPBF reliable?
The price and inventory of LT3470ITS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3470ITS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3470ITS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3470ITS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3470ITS8#TRMPBF?
LT3470ITS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3470ITS8#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 LT3470ITS8#TRMPBF?
For technical support, including LT3470ITS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3470ITS8#TRMPBF requirements.
6.How does Aetrix verify that LT3470ITS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3470ITS8#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 LT3470ITS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3470ITS8#TRMPBF?
All LT3470ITS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3470ITS8#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 LT3470ITS8#TRMPBF part is unused and in its original packaging.
Return procedure for LT3470ITS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3470ITS8#TRMPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
