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Analog Devices Inc. LT1934IS6-1#TRMPBF
- Part No.:
- LT1934IS6-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934IS6-1#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 60MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,115
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Product details
Overview
LT1934IS6-1#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with internal 75mA current-limited bipolar NPN switch, housed in a 6-lead TSOT-23 package. It operates from 3.2V to 34V input, delivers up to 60mA at 3.3V or 5V output, and draws only 12μA quiescent current-enabling long battery life in portable standby power supplies.
For engineers reviewing the LT1934IS6-1#TRMPBF datasheet, LT1934IS6-1#TRMPBF pinout, LT1934IS6-1#TRMPBF application, or LT1934IS6-1#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance (–40°C to 125°C), and real-world substitution guidance for low-current industrial and automotive regulation tasks.
Technical Context
The LT1934IS6-1#TRMPBF uses Burst Mode® control architecture with fixed 1.8μs off-time and variable on-time regulated by feedback comparator hysteresis (10mV) and 1.25V reference. Its internal bipolar NPN switch achieves 65mV VCE(SAT) at 75mA in TSOT-23, enabling high efficiency down to ultra-light loads.
Operation relies on external BOOST capacitor/diode network to elevate gate drive above VIN, allowing full saturation of the NPN switch. Shutdown disconnects all internal circuitry except leakage paths, reducing VIN current to <1μA-critical for battery-powered systems requiring zero-current sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 5V rails, wall adapters, and lead-acid batteries without external pre-regulation. |
| Output Current Capability | 60mA max at 3.3V or 5V - optimized for low-power standby, sensor biasing, and microcontroller auxiliary rails. |
| Quiescent Current | 12μA typical - enables >1-year runtime on CR2032 in always-on monitoring circuits. |
| Shutdown Current | <1μA - ensures negligible battery drain during system sleep modes. |
| Switch VCE(SAT) | 65mV at 75mA - minimizes conduction loss and thermal rise in compact TSOT-23 footprint. |
| Feedback Reference | 1.25V ±2% - sets output via resistor divider (VOUT = 1.25V × (1 + R1/R2)) with 10mV hysteresis for stable Burst Mode transitions. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
LT1934IS6-1#TRMPBF is packaged in a 6-lead plastic TSOT-23 (ThinSOT™) measuring 2.9mm × 1.6mm × 1.0mm, with exposed pad not present (unlike DFN variants). Thermal resistance θJA = 250°C/W enables operation at full load without forced airflow in standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge pump bootstrap supply | Accepts externally generated voltage ≥2.5V above SW to fully saturate internal NPN switch; requires 0.1μF ceramic capacitor and fast diode. |
| GND (Pin 2) | Power and signal reference | Must connect to low-impedance local ground plane; return path for FB divider and catch diode cathode. |
| FB (Pin 3) | Regulation sense input | Monitored at 1.25V reference; open-drain comparator triggers switching when voltage falls below threshold minus hysteresis. |
| SHDN (Pin 4) | Enable/disable control | Logic-high ≥2.3V enables operation; grounded disables all circuitry except leakage paths (<1μA VIN current). |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch driver; requires local 2.2μF ceramic bypass capacitor near pin. |
| SW (Pin 6) | Switch node output | Drives external inductor and catch diode; swings between VIN and ~0.1V during operation; high dv/dt demands tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency at 100μA load by pulsing switch only when output droops below hysteresis band. |
| Low VCE(SAT) switch | 65mV drop at 75mA reduces thermal stress in TSOT-23, enabling 60mA continuous output without derating. |
| Integrated current limiting | 120mA peak limit (min) protects against shorted outputs even at 34V input-no external sensing required. |
| Wide input range support | 3.2V–34V operation eliminates need for pre-regulators in multi-source systems (e.g., battery + wall adapter). |
| High-temp qualification | –40°C to +125°C rating allows deployment in engine control units, industrial PLCs, and outdoor metering hardware. |
Applications
| Automotive Battery Regulation | Standby Power for Portable Products |
|---|---|
Use Scenario: Regulating 12V automotive battery to 3.3V for CAN transceiver bias in body control modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, low-noise 3.3V rail during ignition-off sleep mode. Use Value: 12μA quiescent current prevents parasitic battery drain exceeding 100μA total system sleep current. | Use Scenario: Powering real-time clock and memory retention in handheld medical devices during lithium coin-cell operation. IC Role / Device Role / Timing Role: Micropower buck converter supplying stable 3.3V from depleted 2.8V–3.6V battery range. Use Value: Burst Mode® maintains >80% efficiency at 50μA load, extending CR2032 life beyond 3 years. |
| Industrial Control Supplies | Distributed Supply Regulation |
Use Scenario: Generating 5V auxiliary rail for isolated RS-485 transceivers in factory-floor I/O modules. IC Role / Device Role / Timing Role: Input-flexible regulator accepting 24V DC field bus or backup supercapacitor discharge. Use Value: 34V absolute max input withstands 24V bus transients per IEC 61000-4-5 Level 3. | Use Scenario: Local 3.3V generation for wireless sensor node MCU from shared 12V backbone. IC Role / Device Role / Timing Role: Point-of-load regulator minimizing IR drop and noise coupling in distributed architecture. Use Value: TSOT-23 footprint and 60mA capability enable placement within 2mm of load, reducing trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3675EFE-1#PBF | Higher 300mA output, 2.5V–5.5V input, integrated MOSFETs, 2.2MHz fixed frequency | Requires lower input voltage; unsuitable for 24V+ inputs or ultra-low IQ needs | Select only if input is ≤5.5V and higher current is needed; not drop-in due to different pinout and control scheme |
| TPS62231DRYR | 600mA output, 2.05V–6.5V input, 3.6μA IQ, DSBGA package | Cannot handle >6.5V input; lacks 34V tolerance and automotive temp grade | Consider only for space-constrained consumer designs with ≤6.5V supply; no thermal qualification for industrial use |
Compared with LTC3675EFE-1#PBF and TPS62231DRYR, the LT1934IS6-1#TRMPBF uniquely combines 34V input tolerance, –40°C to 125°C operation, and sub-15μA quiescent current-making it irreplaceable for high-voltage, high-reliability, battery-critical applications where alternatives fail on voltage range, temperature, or IQ.
Availability
LT1934IS6-1#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, standby power for portable products, and distributed supply regulation requiring stable component supply across extended temperature ranges.
Supply support for LT1934IS6-1#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 legacy Linear parts including the LT1934 family.
The LT1934 product line was designed specifically for micropower, wide-input-voltage DC/DC conversion in space- and energy-constrained systems-targeting automotive, industrial, and portable instrumentation markets.
FAQ
What is the maximum output current of the LT1934IS6-1#TRMPBF?
The LT1934IS6-1#TRMPBF delivers up to 60mA at 3.3V or 5V output under typical conditions. This is determined by its 120mA minimum current limit and optimized for applications where external components (inductor, capacitors) are sized for low-power operation. Peak output depends on input voltage, inductor value, and thermal environment-but 60mA is the guaranteed maximum per datasheet specifications across –40°C to 125°C.
Does the LT1934IS6-1#TRMPBF require an external catch diode?
Yes, the LT1934IS6-1#TRMPBF requires an external Schottky catch diode (e.g., ON Semiconductor MBR0540) connected between SW and VOUT. The internal bipolar NPN switch lacks a body diode, so the external diode provides the freewheeling path during switch-off. Diode selection must meet ≥34V reverse voltage rating and ≤0.5A forward current-critical for reliability under fault conditions.
Can the LT1934IS6-1#TRMPBF operate from a 2.5V input source?
No, the LT1934IS6-1#TRMPBF cannot operate from 2.5V. Its absolute minimum input is 3.2V, and undervoltage lockout engages below ~3.0V. Attempting to power it from 2.5V will prevent startup and regulation. For sub-3V inputs, consider alternative regulators like the LTC3642 or TPS61099, which are designed for lower VIN operation.
What is the purpose of the BOOST pin on the LT1934IS6-1#TRMPBF?
The BOOST pin on the LT1934IS6-1#TRMPBF supplies elevated drive voltage to the base of the internal bipolar NPN switch, ensuring full saturation and minimal VCE(SAT). It requires an external 0.1μF capacitor and fast diode (e.g., 1N4148) tied between BOOST and SW. Without proper BOOST voltage ≥2.5V above SW, the switch operates inefficiently-increasing dropout and reducing output current capability.
Is the LT1934IS6-1#TRMPBF pin-compatible with the LT1934IS6#TRMPBF?
Yes, the LT1934IS6-1#TRMPBF is pin-compatible with the LT1934IS6#TRMPBF-both use identical 6-lead TSOT-23 packaging and share identical pinout, footprint, and peripheral circuit requirements. The sole functional difference is current limit (120mA vs. 400mA), meaning the LT1934IS6-1#TRMPBF can be substituted where ≤60mA output suffices, but not vice versa without redesigning magnetics and thermal layout.
LT1934IS6-1#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:
- 60mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1934IS6-1#TRMPBF FAQ
1.How can I place an order for LT1934IS6-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934IS6-1#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 LT1934IS6-1#TRMPBF reliable?
The price and inventory of LT1934IS6-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934IS6-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934IS6-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934IS6-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934IS6-1#TRMPBF?
LT1934IS6-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934IS6-1#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 LT1934IS6-1#TRMPBF?
For technical support, including LT1934IS6-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934IS6-1#TRMPBF requirements.
6.How does Aetrix verify that LT1934IS6-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934IS6-1#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 LT1934IS6-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934IS6-1#TRMPBF?
All LT1934IS6-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934IS6-1#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 LT1934IS6-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934IS6-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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