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Analog Devices Inc. LT1934IS6#TRPBF
- Part No.:
- LT1934IS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934IS6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
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Product details
Overview
LT1934IS6#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 400mA bipolar NPN power switch, designed for wide-input industrial and automotive power rails. It operates from 3.2V to 34V input, delivers up to 300mA at 3.3V or 5V output, features 12μA quiescent current, Burst Mode® operation, and is housed in a thermally enhanced 6-lead TSOT-23 (ThinSOT™) package rated for –40°C to 125°C.
For engineers reviewing the LT1934IS6#TRPBF datasheet, LT1934IS6#TRPBF pinout, LT1934IS6#TRPBF application, or LT1934IS6#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves across load and temperature, real-world thermal resistance data (θJA = 250°C/W), and precise current-limiting behavior under fault conditions - all critical for battery-backed industrial control, automotive standby supplies, and distributed 3.3V/5V regulation.
Technical Context
The LT1934IS6#TRPBF uses Burst Mode® control with fixed 1.8μs off-time and regulated on-time to maintain output regulation while minimizing quiescent current. Its internal bipolar NPN switch requires external BOOST capacitor/diode biasing to achieve full saturation, enabling low VCE(SAT) of 200mV at 300mA.
Feedback regulation targets 1.25V at the FB pin with ±10mV hysteresis; undervoltage lockout engages below 3.2V (min) and disables switching until input exceeds ~3.6V. Shutdown disconnects internal circuitry, reducing VIN current to <1μA, and SHDN pin threshold is 2.3V (high) / 0.25V (low).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 5V logic rails, unregulated wall adapters, and 12V/24V automotive batteries without external pre-regulation. |
| Output Current Capability | Up to 300mA at 3.3V or 5V - sufficient for microcontrollers, sensors, and interface ICs in space-constrained industrial modules. |
| Quiescent Current | 12μA typical - enables multi-year battery life in always-on monitoring systems with intermittent wake-up cycles. |
| Switch VCE(SAT) | 200mV at 300mA (S6 package) - minimizes conduction loss and thermal rise in high-duty-cycle operation. |
| FB Reference Voltage | 1.25V ±2% - sets output via resistor divider (VOUT = 1.25V × (1 + R1/R2)), enabling precise 3.3V/5V or custom voltage generation. |
| Shutdown Current | <1μA - fully isolates load from input during deep sleep, eliminating parasitic drain in battery-powered equipment. |
| Thermal Resistance θJA | 250°C/W (TSOT-23) - requires minimal copper area for thermal relief in compact PCB layouts; junction-to-case is 102°C/W. |
Pinout & Package
LT1934IS6#TRPBF is packaged in a 6-lead plastic TSOT-23 (ThinSOT™) with 1mm profile, optimized for thermal performance and board space efficiency in high-density industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Boost capacitor drive node | Supplies elevated gate drive voltage to internal NPN switch; must be ≥2.5V above SW for full saturation and low VCE(SAT). |
| GND (Pin 2) | Power and signal ground reference | Return path for feedback divider, internal regulators, and switch current; must connect to low-impedance local ground plane. |
| FB (Pin 3) | Feedback voltage sense input | Regulated to 1.25V; determines output voltage via external resistor divider; includes 10mV hysteresis for stable Burst Mode operation. |
| SHDN (Pin 4) | Enable/disable control input | Logic-high (≥2.3V) enables regulation; grounded disables all circuitry and reduces VIN current to <1μA. |
| VIN (Pin 5) | Main power input | Supplies internal bias and switch current; requires local 2.2μF ceramic bypass capacitor to suppress high-frequency switching noise. |
| SW (Pin 6) | Internal switch collector node | Connects to inductor, catch diode cathode, and BOOST capacitor; swings between VIN and near-GND during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >80% efficiency down to 100μA load while holding IQ at 12μA - ideal for intermittent-sensing IoT nodes. |
| Wide input range (3.2V–34V) | Eliminates need for upstream pre-regulators in automotive cold-crank (6V) and industrial 24V/32V systems. |
| Integrated 400mA switch with 200mV VCE(SAT) | Reduces external component count and PCB footprint vs. controller+MOSFET solutions; enables single-chip 300mA buck. |
| Low shutdown current (<1μA) | Prevents battery depletion during storage or system hibernation - critical for portable test equipment and remote sensors. |
| Thermally robust TSOT-23 package | Rated for –40°C to 125°C ambient; exposed pad not present in S6 but achieves 102°C/W θJC via leadframe conduction. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V for CAN transceivers and microcontrollers during cold-crank (6V) and load-dump (36V) events. IC Role / Device Role / Timing Role: Primary step-down regulator with wide VIN tolerance and robust overvoltage/undervoltage protection. Use Value: Maintains 3.3V output across 6V–34V input transients without external LDO post-regulation, reducing BOM cost and board area. |
Use Scenario: Powering PLC I/O modules, sensor signal conditioners, and fieldbus interface ICs from unregulated 24V industrial rails. IC Role / Device Role / Timing Role: Micropower buck converter delivering clean 5V/3.3V with low thermal footprint in sealed enclosures. Use Value: 12μA quiescent current extends uptime in battery-buffered controllers; 125°C rating ensures reliability in hot control cabinets. |
| Standby Power for Portable Products | Distributed Supply Regulation |
Use Scenario: Providing always-on 3.3V rail for real-time clocks, memory retention, and wake-up logic in handheld test meters and medical devices. IC Role / Device Role / Timing Role: Low-IQ primary regulator enabling multi-year coin-cell or Li-ion backup operation. Use Value: <1μA shutdown current prevents battery drain during shipping/storage; Burst Mode ensures fast wake-up response. |
Use Scenario: Local point-of-load conversion for FPGA I/O banks, ADC references, and isolated communication interfaces in modular instrumentation. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator eliminating need for external MOSFET drivers or gate charge pumps. Use Value: TSOT-23 footprint fits tight spacing around high-speed digital ICs; fixed 1.8μs off-time ensures predictable EMI spectrum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#PBF | Higher 40V max input, 500mA output, synchronous rectification, 2.5μA IQ - but larger 10-lead MSOP package and no BOOST pin dependency. | Better suited for higher-current, lower-noise applications where layout space allows larger package and synchronous efficiency is prioritized. | Select LTC3642EMSE#PBF when >300mA output or <2.5μA IQ is required; avoid if TSOT-23 footprint or bipolar-switch simplicity is mandatory. |
| TPS62130ARGTR | 3–17V input, 3A output, 17μA IQ, integrated MOSFETs - but only rated to 85°C and lacks 34V tolerance or automotive-grade temp range. | Optimized for consumer/portable apps with moderate input range; unsuitable for 24V industrial or automotive battery direct connection. | Choose TPS62130ARGTR for cost-sensitive, high-current 5V/3.3V rails in commercial temperature environments; not a drop-in replacement for LT1934IS6#TRPBF's extended temp or voltage range. |
Compared with LTC3642EMSE#PBF and TPS62130ARGTR, LT1934IS6#TRPBF uniquely combines 34V input tolerance, –40°C to 125°C operation, and ultra-low 12μA IQ in a 6-lead TSOT-23 - making it irreplaceable for ruggedized, battery-conscious industrial and automotive subsystems where voltage headroom and thermal margin are non-negotiable.
Availability
LT1934IS6#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and standby power for portable products requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1934IS6#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LT1934 family.
The LT1934 series was designed specifically for micropower, wide-input industrial and automotive DC/DC conversion - emphasizing low IQ, high-voltage resilience, and robust thermal performance in minimal footprints.
FAQ
What is the maximum output current capability of the LT1934IS6#TRPBF?
The LT1934IS6#TRPBF delivers up to 300mA continuous output current at 3.3V or 5V when used with appropriate external components (e.g., 47μH inductor, 100μF output capacitor). Its internal bipolar switch has a guaranteed current limit of 350mA (min) and 400mA (typ), with thermal derating above 85°C ambient. The LT1934IS6#TRPBF is not the -1 variant - it supports full 300mA load capability unlike the 60mA-limited LT1934-1 versions.
Does the LT1934IS6#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1934IS6#TRPBF requires an external BOOST capacitor (typically 0.1μF ceramic) and fast-switching diode (e.g., 1N4148 or BAT54) connected between SW and BOOST pins. This network generates a voltage higher than VIN to fully saturate the internal bipolar NPN switch, ensuring low VCE(SAT) of 200mV at 300mA. Omitting or misconfiguring the BOOST circuit causes excessive switch dissipation and potential thermal shutdown.
What is the operating temperature range for the LT1934IS6#TRPBF?
The LT1934IS6#TRPBF is specified for operation from –40°C to +125°C ambient temperature. This "I" grade rating is confirmed in the official Linear Technology (now Analog Devices) order information table and applies to both electrical performance and thermal limits. Its θJA of 250°C/W and θJC of 102°C/W are measured under standard JEDEC conditions and remain valid across the full –40°C to 125°C range.
How does the LT1934IS6#TRPBF achieve low quiescent current in Burst Mode®?
The LT1934IS6#TRPBF achieves 12μA typical quiescent current by disabling its oscillator and power switch when the FB pin voltage exceeds 1.25V, leaving only the feedback comparator, reference, and UVLO circuits active. During this micropower state, VIN current drops to 12μA. When output voltage sags, the comparator re-enables switching in short bursts - a behavior documented in the LT1934IS6#TRPBF's block diagram and typical performance curves (Figure 1, G10).
Can the LT1934IS6#TRPBF be used with ceramic output capacitors?
Yes, the LT1934IS6#TRPBF can use ceramic output capacitors, but only X5R or X7R dielectrics are recommended due to their stable capacitance vs. temperature and DC bias. Y5V/Z5U types exhibit severe capacitance loss at bias voltage and may cause excessive output ripple or instability. Additionally, piezoelectric ringing in ceramics can generate audible noise at light loads - mitigated by adding a 10pF phase-lead capacitor from VOUT to FB, as validated in the LT1934IS6#TRPBF application schematics.
LT1934IS6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 3.2V
- Voltage - Input (Max):
- 34V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 29.92V
- Current - Output:
- 300mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1934IS6#TRPBF FAQ
1.How can I place an order for LT1934IS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934IS6#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 LT1934IS6#TRPBF reliable?
The price and inventory of LT1934IS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934IS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1934IS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934IS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934IS6#TRPBF?
LT1934IS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934IS6#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 LT1934IS6#TRPBF?
For technical support, including LT1934IS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934IS6#TRPBF requirements.
6.How does Aetrix verify that LT1934IS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1934IS6#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 LT1934IS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1934IS6#TRPBF?
All LT1934IS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934IS6#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 LT1934IS6#TRPBF part is unused and in its original packaging.
Return procedure for LT1934IS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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