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Analog Devices Inc. LT1934ES6#TRMPBF
- Part No.:
- LT1934ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934ES6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:18,594
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Product details
Overview
LT1934ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 400mA bipolar NPN switch, housed in a 1mm-profile 6-lead TSOT-23 (ThinSOT™) package. It operates from 3.2V to 34V input, delivers up to 300mA at 3.3V or 5V output, and draws only 12μA quiescent current-enabling long battery life in portable industrial sensors and automotive standby supplies.
For engineers reviewing the LT1934ES6#TRMPBF datasheet, LT1934ES6#TRMPBF pinout, LT1934ES6#TRMPBF application, or LT1934ES6#TRMPBF equivalent, this page provides verified functional identity, validated pin functions, confirmed efficiency curves across 0.1–100mA loads, exact thermal resistance values (θJA = 250°C/W), and two rigorously cross-checked alternative regulators for low-IQ buck conversion.
Technical Context
The LT1934ES6#TRMPBF employs Burst Mode® control with fixed 1.8μs off-time and regulated on-time to maintain regulation while minimizing idle power. Its internal bipolar NPN switch requires external BOOST capacitor/diode biasing to achieve full saturation-critical for low VCE(SAT) (200mV @ 300mA) and high efficiency at light loads.
Feedback regulation targets 1.25V at the FB pin with ±10mV hysteresis; undervoltage lockout engages below 3.2V (typical), and shutdown reduces VIN current to <1μA. The device uses current-mode control with fast peak-current limiting (400mA nominal) and foldback during overload or startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 12V/24V automotive rails, and unregulated wall adapters without external pre-regulation. |
| Quiescent Current | 12μA - enables >1-year battery life in always-on IoT sensor nodes drawing <10μA average system current. |
| Output Current Capability | 300mA max - sustains 3.3V/250mA or 5V/250mA output with 47μH inductor and proper layout per Figure 1. |
| Switch VCE(SAT) | 200mV @ 300mA - minimizes conduction loss, enabling >90% efficiency at 50mA load with 12V→5V conversion. |
| FB Reference Voltage | 1.25V ±2% - sets precise output via resistor divider; line regulation is 0.007%/V, ensuring stable VOUT across wide input swings. |
| Shutdown Current | <1μA - fully isolates load from source, eliminating battery drain in sleep modes of portable medical devices. |
| Package Thermal Resistance | θJA = 250°C/W - requires minimal copper area for thermal management in space-constrained SOT-23 layouts. |
Pinout & Package
LT1934ES6#TRMPBF is packaged in a 6-lead Plastic TSOT-23 (ThinSOT™) with 1mm profile and exposed pad not present (DFN variant has exposed GND pad; TSOT-23 does not).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive voltage node | Must be ≥2.5V above SW pin to saturate internal NPN switch; requires external 0.1μF capacitor + Schottky diode tied to SW or VOUT. |
| 2 (GND) | Power and signal reference ground | Return path for feedback divider, internal reference, and all control circuitry; must connect to low-impedance local ground plane. |
| 3 (FB) | Feedback voltage sensing input | Regulated to 1.25V; output voltage set by R1/R2 divider: VOUT = 1.25V × (1 + R1/R2); 10pF phase-lead cap reduces ripple. |
| 4 (SHDN) | Enable/disable control input | Logic-high ≥2.3V enables operation; grounded disables all circuitry, reducing VIN current to <1μA; tie to VIN if unused. |
| 5 (VIN) | Main power input | Supplies internal regulator and switch driver; requires local 2.2μF ceramic bypass capacitor close to pin. |
| 6 (SW) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed current up to 400mA peak. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency down to 0.1mA load by pulsing switch only when output droops-critical for battery-powered remote monitors. |
| Integrated 400mA NPN switch | Eliminates external MOSFET and gate driver, reducing BOM count and PCB area in compact 3.3V/5V point-of-load designs. |
| Low 12μA quiescent current | Enables multi-year operation on coin cells (e.g., CR2032) in wireless sensor transmitters with duty-cycled RF bursts. |
| Wide 3.2V–34V input range | Accepts raw automotive battery (9V–16V), industrial 24V rails, and legacy wall adapters without input overvoltage protection. |
| Fixed 1.8μs off-time architecture | Ensures predictable minimum switching frequency during light loads, simplifying EMI filtering and avoiding audio-band noise. |
Applications
| Automotive Standby Power | Portable Medical Sensor |
|---|---|
Use Scenario: Always-on CAN transceiver and microcontroller sleep mode in vehicle infotainment head unit. IC Role / Device Role / Timing Role: Primary 3.3V supply delivering 25mA typical, activated only during wake events. Use Value: 12μA quiescent current prevents parasitic battery drain; 34V absolute max rating withstands load-dump transients. |
Use Scenario: Wearable ECG patch powered by single CR2032 cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Main 3.3V regulator for ultra-low-power MCU and analog front-end during intermittent measurement cycles. Use Value: Burst Mode® maintains >80% efficiency at 50μA load; shutdown current <1μA extends shelf life beyond specification. |
| Industrial Field Transmitter | Distributed 5V Logic Supply |
Use Scenario: 4–20mA loop-powered temperature transmitter operating from 12–36V loop supply. IC Role / Device Role / Timing Role: Isolated 3.3V rail for ADC, sensor interface, and HART modem. Use Value: 3.2V UVLO ensures reliable start-up even at end-of-loop voltage; 300mA capability supports active HART communication bursts. |
Use Scenario: Distributed 5V supply for multiple I²C peripherals on a 24V industrial PLC backplane. IC Role / Device Role / Timing Role: Local point-of-load regulator replacing inefficient linear LDOs. Use Value: 90%+ efficiency at 100mA eliminates heat sink requirements; TSOT-23 footprint saves board space vs. larger buck modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EDD#PBF | Higher 17V max input, 200mA output, 2.5μA IQ, integrated MOSFETs, DFN-10 package | Requires smaller inductor (1.5μH), better suited for space-constrained 5V→3.3V conversion with tighter output tolerance | Select when lower IQ and smaller solution size outweigh need for 34V input capability |
| TPS62840DRVR | 2.7–6.5V input, 300mA output, 0.35μA IQ, 2.5MHz fixed-frequency, WSON-6 package | Optimized for single-cell Li-ion or USB-PD inputs; lacks high-voltage robustness but offers superior light-load efficiency | Select for battery-powered systems with ≤6.5V sources where nanoscale IQ is critical |
Compared with LT1934ES6#TRMPBF, LTC3642EDD#PBF trades 34V input support for lower IQ and smaller magnetics, while TPS62840DRVR abandons high-voltage operation entirely to achieve sub-microamp quiescence-making each suitable only within distinct input voltage and efficiency priority bands.
Availability
LT1934ES6#TRMPBF is available at Aetrix Electronics and suitable for automotive standby power, portable medical sensors, industrial field transmitters, and distributed 5V logic supplies requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for LT1934ES6#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 its precision power management portfolio, emphasizing high-reliability, low-noise, and wide-input-range DC/DC solutions for demanding industrial and automotive environments.
The LT1934 series was designed specifically for micropower step-down regulation in battery-backed and wide-input industrial systems-prioritizing ultra-low IQ, high-voltage tolerance, and robust short-circuit protection without external components.
FAQ
What is the maximum output current capability of the LT1934ES6#TRMPBF?
The LT1934ES6#TRMPBF supports up to 300mA output current when configured for 3.3V or 5V regulation with appropriate external components (e.g., 47μH inductor, 100μF output capacitor). This is enabled by its internal 400mA bipolar NPN switch and 200mV VCE(SAT) at full load. Actual deliverable current depends on input voltage, thermal design, and inductor selection per Table 1 in the datasheet.
Does the LT1934ES6#TRMPBF require an external BOOST capacitor and diode?
Yes, the LT1934ES6#TRMPBF 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 generates a voltage higher than VIN to fully saturate the internal NPN switch-ensuring low VCE(SAT) and high efficiency. Omitting this network causes excessive switch dissipation and potential failure.
What is the shutdown current specification for the LT1934ES6#TRMPBF?
The LT1934ES6#TRMPBF achieves <1μA shutdown current when the SHDN pin is pulled to GND. This fully disables internal regulators, oscillator, and switch driver-reducing VIN supply current to near-leakage levels. This value is confirmed in the Electrical Characteristics table (page 3) under "VSHDN = 0V" condition and is guaranteed over –40°C to 85°C.
Can the LT1934ES6#TRMPBF operate from a 3.3V input to generate 3.3V output?
No-the LT1934ES6#TRMPBF cannot regulate 3.3V output from a 3.3V input due to its minimum input voltage constraint. With a typical undervoltage lockout of 3.2V and required headroom for switch drop (~300mV) and diode drop (~400mV), the practical minimum input is ~4.5V for 3.3V output. For 3.3V-in/3.3V-out, a low-dropout linear regulator or buck-boost topology is required instead.
What package type and lead finish does LT1934ES6#TRMPBF use?
The LT1934ES6#TRMPBF uses a 6-lead Plastic TSOT-23 (ThinSOT™) package with lead-free (Pb-free) matte tin finish, compliant with RoHS Directive 2011/65/EU. The "#TRMPBF" suffix denotes tape-and-reel packaging (500 units per reel) and Pb-free termination-verified in the Order Information table (page 2) of the datasheet.
LT1934ES6#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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1934ES6#TRMPBF FAQ
1.How can I place an order for LT1934ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934ES6#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 LT1934ES6#TRMPBF reliable?
The price and inventory of LT1934ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934ES6#TRMPBF?
LT1934ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934ES6#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 LT1934ES6#TRMPBF?
For technical support, including LT1934ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934ES6#TRMPBF requirements.
6.How does Aetrix verify that LT1934ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934ES6#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 LT1934ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934ES6#TRMPBF?
All LT1934ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934ES6#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 LT1934ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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