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Analog Devices Inc. LT1934EDCB#TRMPBF
- Part No.:
- LT1934EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1934EDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LT1934EDCB#TRMPBF 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 battery-powered systems. 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 uses a low-profile 6-lead (2mm × 3mm) DFN package with exposed ground pad.
For engineers reviewing the LT1934EDCB#TRMPBF datasheet, LT1934EDCB#TRMPBF pinout, LT1934EDCB#TRMPBF application, or LT1934EDCB#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves across load and temperature, real-world component selection guidance for inductors and capacitors, and direct alternative options for 3.3V/5V micropower buck regulation in space-constrained designs.
Technical Context
The LT1934EDCB#TRMPBF employs Burst Mode® control with fixed 1.8μs off-time and regulated on-time to maintain regulation while minimizing quiescent current. Its internal bipolar NPN switch achieves 200mV VCE(SAT) at 300mA in the DFN package, enabling high efficiency down to light loads.
Feedback regulation targets 1.25V at the FB pin with ±10mV hysteresis; shutdown disconnects internal circuitry to <1μA VIN current. The BOOST pin requires external diode and capacitor to generate >2.5V above SW for full switch saturation, critical for stable operation at low duty cycles.
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 | Up to 300mA - enables single-stage conversion for moderate-power microcontrollers or sensors in portable equipment. |
| Quiescent Current | 12μA - sustains >1-year battery life in standby mode for remote IoT nodes powered by AA/AAA cells. |
| Shutdown Current | <1μA - fully isolates load from source, eliminating parasitic drain in always-off system states. |
| Switch VCE(SAT) | 200mV at 300mA (DFN package) - reduces conduction loss and thermal rise under full load, supporting compact thermal design. |
| Feedback Reference | 1.25V ±2% - sets precise output via resistor divider; enables accurate 3.3V (R1/R2 = 1.64) or 5V (R1/R2 = 3.0) regulation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including automotive cabin electronics and factory automation controllers. |
Pinout & Package
LT1934EDCB#TRMPBF is housed in a 6-lead (2mm × 3mm × 0.8mm) plastic DFN package with exposed thermal pad (Pin 7), which must be soldered to PCB ground for thermal and electrical performance. The package offers 73.5°C/W θJA and 12°C/W θJC, enabling higher power density than TSOT-23 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge pump drive node | Must be ≥2.5V above SW to fully saturate internal NPN switch; connects to external diode/capacitor network for bootstrapping. |
| GND (Pin 5) | Power and signal reference | Primary ground return for feedback divider, internal regulators, and power switch emitter; ties to exposed pad (Pin 7). |
| FB (Pin 6) | Regulation sense input | Monitored at 1.25V reference; output voltage set by R1/R2 divider; hysteresis enables Burst Mode® switching transitions. |
| SHDN (Pin 4) | Enable/disable control | Logic-high ≥2.3V enables operation; grounded disables all circuitry except leakage (<1μA); floating not recommended. |
| VIN (Pin 3) | Main power input | Supplies internal bias and switch collector; requires local 2.2μF ceramic bypass; withstands 34V absolute max. |
| SW (Pin 2) | Switch node output | Connects to inductor, catch diode cathode, and boost capacitor anode; swings between VIN and ~–0.4V during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains >85% efficiency at 100μA load by pulsing energy delivery-critical for battery longevity in intermittent-sensing applications. |
| Wide Input Range (3.2V–34V) | Eliminates need for upstream pre-regulators in multi-source systems (e.g., dual battery + USB input), reducing BOM count and board area. |
| Low 12μA Quiescent Current | Enables direct connection to primary battery without dedicated power switches-simplifies architecture in wearables and medical patches. |
| Integrated 400mA Switch | Removes external MOSFET and gate driver, cutting solution size by >40% versus discrete buck controllers in DFN footprint. |
| Exposed Thermal Pad (Pin 7) | Reduces junction-to-board thermal resistance to 12°C/W-supports continuous 300mA output at 85°C ambient without derating. |
Applications
| Automotive Cabin Electronics | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Powering CAN transceivers and microcontrollers in dashboard modules supplied from 12V battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering stable rail despite wide input transients; handles 34V load-dump surges without latch-up. Use Value: Eliminates need for TVS + LDO cascade; 300mA output supports full CAN FD PHY + MCU + EEPROM without secondary converters. |
Use Scenario: Remote vibration sensor node powered by two AA cells, transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Micropower step-down regulator maintaining 3.3V for MCU and radio during active bursts; enters 12μA sleep between transmissions. Use Value: Extends battery life to >2 years by minimizing no-load consumption-validated across –40°C to +85°C operating range. |
| Portable Medical Devices | Distributed Control Systems |
|
Use Scenario: Glucose meter using coin-cell battery and requiring precise analog front-end biasing at 3.3V. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source for ADC reference and op-amp rails; Burst Mode® avoids audible ceramic capacitor noise. Use Value: Achieves <15mVpp output ripple with 10pF phase-lead cap-meets EN 60601-1 EMC requirements without ferrite beads. |
Use Scenario: PLC I/O module with isolated 24V field supply powering multiple 3.3V logic rails across DIN-rail enclosure. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V to 3.3V for FPGA configuration and communication ICs. Use Value: Withstands 34V transients per IEC 61000-4-5; DFN thermal pad ensures reliable operation at 70°C ambient inside sealed housing. |
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 |
|---|---|---|---|
| LTC3642EMSE#PBF | Higher 40V input rating, 200mA output, 2.5μA IQ, synchronous rectification | Better suited for 28V industrial rails; lower output current limits use in high-load scenarios | Select when ultra-low IQ (<5μA) and synchronous efficiency >90% at 10mA are required; requires different layout due to MSOP-10 package |
| TPS62840DLCR | 2.7V–6.5V input, 300mA output, 0.35μA IQ, integrated inductor option | Only valid for low-input systems (e.g., single Li-ion); lacks 34V surge tolerance | Choose for space-constrained consumer wearables where input never exceeds 6.5V; incompatible with automotive or 24V industrial inputs |
Compared with LT1934EDCB#TRMPBF, LTC3642EMSE#PBF offers superior input ruggedness but reduced output current, while TPS62840DLCR achieves dramatically lower quiescent current at the cost of input voltage range-making LT1934EDCB#TRMPBF the only option covering 3.2V–34V with 300mA capability in a 2mm×3mm DFN.
Availability
LT1934EDCB#TRMPBF is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial sensor nodes, portable medical devices, and distributed control systems requiring stable component supply with guaranteed long-term availability.
Supply support for LT1934EDCB#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, datasheets, and application engineering for legacy Linear parts including the LT1934 series.
The LT1934 product line was designed specifically for micropower, wide-input DC/DC conversion in space- and energy-constrained applications such as battery-backed instrumentation and automotive subsystems.
FAQ
What is the maximum output current capability of the LT1934EDCB#TRMPBF?
The LT1934EDCB#TRMPBF supports up to 300mA of continuous output current when configured for 3.3V or 5V regulation with appropriate external components-including a 47μH inductor and 100μF output capacitor. This rating assumes operation within the –40°C to +85°C temperature range and proper thermal management via the exposed ground pad.
Does the LT1934EDCB#TRMPBF require an external catch diode?
Yes, the LT1934EDCB#TRMPBF requires an external Schottky catch diode (e.g., ON Semiconductor MBR0540) connected between SW and GND. The device lacks synchronous rectification, so the diode provides the return path for inductor current during switch-off time-omitting it will cause failure.
Can the LT1934EDCB#TRMPBF operate from a 3.3V input to generate 3.3V output?
No-the LT1934EDCB#TRMPBF cannot regulate 3.3V output from a 3.3V input due to its minimum input requirement of 3.2V plus headroom for switch drop and diode forward voltage. For 3.3V-in/3.3V-out applications, a low-dropout linear regulator or buck-boost topology is required instead.
How does the BOOST pin function in the LT1934EDCB#TRMPBF circuit?
The BOOST pin on the LT1934EDCB#TRMPBF supplies gate drive voltage to the internal bipolar NPN switch. It must be held ≥2.5V above the SW pin using an external diode and capacitor; insufficient BOOST voltage causes incomplete switch saturation, increasing VCE(SAT) and reducing efficiency-especially at high duty cycles.
Is the LT1934EDCB#TRMPBF pin-compatible with the LT1934ES6#TRMPBF?
No-LT1934EDCB#TRMPBF (6-lead DFN) and LT1934ES6#TRMPBF (6-lead TSOT-23) share identical functionality and pin numbering but differ physically: DFN uses a 2mm×3mm body with exposed thermal pad (Pin 7), while TSOT-23 uses a 3mm×1.7mm body without thermal pad. PCB layout and thermal design are not interchangeable.
LT1934EDCB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- 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:
- 6-DFN (2x3)
LT1934EDCB#TRMPBF FAQ
1.How can I place an order for LT1934EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934EDCB#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 LT1934EDCB#TRMPBF reliable?
The price and inventory of LT1934EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934EDCB#TRMPBF?
LT1934EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934EDCB#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 LT1934EDCB#TRMPBF?
For technical support, including LT1934EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934EDCB#TRMPBF requirements.
6.How does Aetrix verify that LT1934EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934EDCB#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 LT1934EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934EDCB#TRMPBF?
All LT1934EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934EDCB#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 LT1934EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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