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Analog Devices Inc. LT1934IS6#TRMPBF
- Part No.:
- LT1934IS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934IS6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,423
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Product details
Overview
LT1934IS6#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 400mA bipolar NPN switch, designed for high-efficiency regulation from 3.2V to 34V input sources. It delivers up to 300mA at 3.3V or 5V output in automotive battery regulation and portable standby power systems, featuring 12μA quiescent current, <1μA shutdown current, and Burst Mode® operation.
For engineers reviewing the LT1934IS6#TRMPBF datasheet, LT1934IS6#TRMPBF pinout, LT1934IS6#TRMPBF application, or LT1934IS6#TRMPBF equivalent, key selection criteria include input voltage range (3.2–34V), output current capability (300mA), thermal grade (–40°C to 125°C), ThinSOT-23 package constraints, and compatibility with external boost diode/capacitor networks for switch saturation.
Technical Context
The LT1934IS6#TRMPBF uses Burst Mode® control with fixed 1.8μs off-time and regulated on-time to maintain output regulation across wide load ranges. Its internal bipolar NPN switch requires BOOST pin voltage ≥2.5V above SW to ensure full saturation, enabling low VCE(SAT) of 200mV at 300mA.
Feedback regulation targets 1.25V at FB pin with ±10mV hysteresis; undervoltage lockout activates below 3.2V (typical). Current limiting is set at 400mA (LT1934 variant), with fast fault response protecting against shorted outputs even at 34V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 5V rails, wall transformers, and lead-acid batteries without external pre-regulation. |
| Output Current | Up to 300mA - sufficient for microcontroller cores, sensors, and low-power logic in industrial and automotive subsystems. |
| Quiescent Current | 12μA - enables multi-year battery life in always-on monitoring applications with infrequent wake cycles. |
| Shutdown Current | <1μA - fully isolates load from input source, simplifying power sequencing in battery-powered designs. |
| Switch VCE(SAT) | 200mV at 300mA - minimizes conduction loss and improves efficiency at medium-to-high loads. |
| FB Reference Voltage | 1.25V ±2% - sets output via resistor divider (VOUT = 1.25V × (1 + R1/R2)), enabling precise 3.3V or 5V regulation. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
LT1934IS6#TRMPBF is housed in a 6-lead Plastic TSOT-23 (ThinSOT™) package, 1mm profile, with exposed pad not present (unlike DFN variants). Pin 1 is BOOST; Pin 2 is GND; Pin 3 is FB; Pin 4 is SHDN; Pin 5 is VIN; Pin 6 is SW.
| 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 reference | Return path for feedback divider, internal regulators, and switch emitter; requires low-impedance local ground plane. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; regulates to 1.25V with 10mV hysteresis for stable Burst Mode operation. |
| SHDN (Pin 4) | Enable/disable control | Logic-low (≤0.25V) disables all circuitry; logic-high (≥2.3V) enables operation; floating or tied to VIN for always-on use. |
| VIN (Pin 5) | Main power input | Supplies internal bias regulator and switch collector; requires local 2.2μF ceramic bypass capacitor near pin. |
| SW (Pin 6) | Switch collector output | Drives external inductor and catch diode; carries pulsed high-current waveform; layout critical for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >80% efficiency down to 100μA load while holding quiescent current at 12μA - ideal for intermittent-sensing nodes. |
| Integrated 400mA NPN switch | Eliminates need for external MOSFET driver and discrete switch; reduces BOM count and PCB area in space-constrained designs. |
| Wide 3.2V–34V input range | Accepts unregulated inputs directly - avoids pre-regulator stage in battery-fed or legacy power systems. |
| Low 200mV VCE(SAT) | Reduces conduction loss by ~30% vs. typical 300mV switches at 300mA - improves thermal margin in sealed enclosures. |
| –40°C to 125°C operation | Qualified for automotive engine compartments and industrial motor drives without derating or heatsinking. |
Applications
| Automotive Battery Regulation | Standby Power for Portable Products |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V for CAN transceiver or microcontroller sleep mode. IC Role / Device Role / Timing Role: Primary buck regulator providing always-on low-power rail during ignition-off state. Use Value: 12μA quiescent current prevents excessive battery drain over weeks of vehicle inactivity. |
Use Scenario: Powering real-time clock and sensor interface in handheld medical device during standby. IC Role / Device Role / Timing Role: Micropower step-down converter maintaining regulated 3.3V from primary alkaline cells. Use Value: <1μA shutdown current extends shelf life and operational runtime between battery replacements. |
| Industrial Control Supplies | Distributed Supply Regulation |
Use Scenario: Generating 5V local supply for PLC I/O module from 24V field bus. IC Role / Device Role / Timing Role: Isolated point-of-load regulator tolerant of noisy 24V industrial rail transients. Use Value: 34V absolute max input rating withstands 40V surge events per IEC 61000-4-4 without external clamping. |
Use Scenario: Providing 3.3V rail to remote sensor node powered via long cable from central 12V supply. IC Role / Device Role / Timing Role: Local DC/DC converter compensating for IR drop and noise on distributed wiring. Use Value: Wide 3.2–34V input range accommodates voltage sag down to 4.5V at load while sustaining 3.3V output. |
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 | Monolithic synchronous buck; 40V max input; 120mA output; 2.5μA IQ | Lower output current, lower IQ, no external diode required - suited for ultra-low-power sub-100mA rails | Select when synchronous rectification and minimal BOM are prioritized over 300mA capability. |
| TPS62130ARGTR | Synchronous buck; 3–17V input; 3A output; 17μA IQ; 2.5mm × 2.5mm QFN | Higher current, wider temperature range (–40°C to 125°C), but narrower input range excludes 24V/34V systems | Select for higher-output-current applications where input stays below 17V and board space allows QFN package. |
Compared with LTC3642EMSE#PBF and TPS62130ARGTR, the LT1934IS6#TRMPBF uniquely balances 34V input tolerance, 300mA output, and 12μA quiescent current in a 3mm × 1.7mm ThinSOT package - making it optimal for automotive and industrial step-down where input voltage uncertainty and battery longevity are critical.
Availability
LT1934IS6#TRMPBF 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 ranges and long production lifecycles.
Supply support for LT1934IS6#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® family of precision analog and power ICs.
The LT1934 series was designed specifically for micropower, wide-input-voltage DC/DC conversion in harsh environments - targeting automotive, industrial, and battery-critical applications where reliability and ultra-low IQ are non-negotiable.
FAQ
What is the maximum input voltage rating for LT1934IS6#TRMPBF?
The LT1934IS6#TRMPBF has an absolute maximum input voltage rating of 34V, as specified in the Absolute Maximum Ratings table. This allows direct connection to 24V automotive systems, unregulated wall adapters, and lead-acid batteries without external overvoltage protection. Operation above 34V risks permanent damage.
Does LT1934IS6#TRMPBF require an external catch diode?
Yes, the LT1934IS6#TRMPBF requires an external Schottky catch diode (e.g., ON Semiconductor MBR0540) connected between SW and GND. The internal bipolar NPN switch lacks body diode functionality, and omission of the diode will prevent proper energy transfer and cause regulation failure or device damage.
What is the purpose of the BOOST pin on LT1934IS6#TRMPBF?
The BOOST pin on LT1934IS6#TRMPBF supplies elevated drive voltage to the base of the internal NPN power switch. A capacitor-diode network (e.g., 0.1μF + 1N4148) generates a voltage ~2.5V above SW, ensuring full transistor saturation and minimizing VCE(SAT) to 200mV at 300mA - critical for high efficiency.
Can LT1934IS6#TRMPBF operate with a 3.3V input?
No - the LT1934IS6#TRMPBF has a minimum operating input voltage of 3.2V (typical) due to undervoltage lockout, and practical startup requires ≥4.5V for 3.3V output due to duty cycle and switch drop limitations. For 3.3V input applications, consider a different topology such as LDO or buck-boost regulator.
What package type does LT1934IS6#TRMPBF use?
The LT1934IS6#TRMPBF uses a 6-lead Plastic TSOT-23 (ThinSOT™) package, 3mm × 1.7mm footprint, 1mm height. It is distinct from the DFN variants (e.g., LT1934IDCB#TRPBF) and does not include an exposed thermal pad - thermal design must rely on PCB copper and ambient convection.
LT1934IS6#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT1934IS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934IS6#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 LT1934IS6#TRMPBF reliable?
The price and inventory of LT1934IS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934IS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934IS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934IS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934IS6#TRMPBF?
LT1934IS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934IS6#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 LT1934IS6#TRMPBF?
For technical support, including LT1934IS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934IS6#TRMPBF requirements.
6.How does Aetrix verify that LT1934IS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934IS6#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 LT1934IS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934IS6#TRMPBF?
All LT1934IS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934IS6#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 LT1934IS6#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934IS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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