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Analog Devices Inc. LT1934EDCB#TRPBF
- Part No.:
- LT1934EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1934EDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
LT1934EDCB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 400mA bipolar NPN power switch, designed for low-noise, high-efficiency regulation in space-constrained 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 and <1μA shutdown current, and uses Burst Mode® control for extended battery life in portable medical monitors and industrial sensors.
For engineers reviewing the LT1934EDCB#TRPBF datasheet, LT1934EDCB#TRPBF pinout, LT1934EDCB#TRPBF application, or LT1934EDCB#TRPBF equivalent, key selection criteria include input voltage range (3.2–34V), output current capability (300mA for LT1934 variant), feedback reference voltage (1.25V), thermal performance in DFN package (θJA = 73.5°C/W), and compatibility with standard 3.3V/5V point-of-load designs requiring micropower operation.
Technical Context
The LT1934EDCB#TRPBF employs a fixed-frequency Burst Mode® control architecture with internal 1.25V reference and hysteresis-based feedback comparator. Its bipolar NPN switch achieves 200mV VCE(SAT) at 300mA in the DFN package, enabling high efficiency across 0.1–300mA load range without external compensation.
It integrates undervoltage lockout (~3.2V), fast current limiting (400mA typical), and BOOST pin drive for switch saturation - all coordinated via a dual one-shot timing circuit with 1.8μs fixed off-time and adjustable on-time. The device requires no external loop compensation and supports discontinuous conduction mode inherently.
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 pre-regulation. |
| Output Current | Up to 300mA - sufficient for powering microcontrollers, RF transceivers, and analog front-ends in portable equipment. |
| Quiescent Current | 12μA - enables >1-year battery life in always-on sensor nodes using CR2032 or AA cells. |
| Feedback Reference | 1.25V ±2% - allows precise 3.3V (R1/R2 = 1.64) or 5V (R1/R2 = 3.0) output with standard resistor tolerances. |
| VCE(SAT) | 200mV at 300mA - minimizes conduction loss and thermal rise in compact DFN layout. |
| Shutdown Current | <1μA - fully isolates load from source, critical for zero-power standby in IoT edge devices. |
| Switching Frequency | Fixed off-time (1.8μs) - enables predictable EMI profile and simplifies input/output filter design. |
Pinout & Package
LT1934EDCB#TRPBF is housed in a 6-lead (2mm × 3mm × 0.8mm) plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground plane for thermal and electrical integrity. Thermal resistance is θJA = 73.5°C/W and θJC = 12°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge pump driver supply | Provides boosted gate drive voltage (>VIN) to saturate internal NPN switch; requires 0.1μF capacitor and fast diode. |
| GND (Pin 5) | Power and signal reference | Primary return path for internal regulator, feedback divider, and exposed pad; must connect to low-impedance ground plane. |
| FB (Pin 6) | Regulation sense input | Monitored at 1.25V reference; sets output via resistive divider (VOUT = 1.25V × (1 + R1/R2)). |
| SHDN (Pin 4) | Enable/disable control | Logic-high ≥2.3V enables operation; grounded disables all circuits and reduces VIN current to <1μA. |
| VIN (Pin 3) | Main power input | Supplies internal bias and switch current; requires local 2.2μF ceramic bypass capacitor near pin. |
| SW (Pin 2) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high dI/dt switching current. |
| Exposed Pad (Pin 7) | Thermal & electrical ground | Must be soldered to PCB ground pour; accounts for >90% of heat dissipation and improves EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency down to 100μA load while holding quiescent current at 12μA - eliminates need for external enable sequencing. |
| Integrated 400mA NPN switch | Eliminates external MOSFET and driver; 200mV VCE(SAT) at 300mA ensures <60mW conduction loss at full load in DFN package. |
| Wide 3.2V–34V input range | Supports direct connection to unregulated sources (e.g., automotive battery, solar charge controller) without input overvoltage protection circuitry. |
| Low-profile DFN package | 2mm × 3mm footprint with 0.8mm height enables placement under connectors or in ultra-thin handheld enclosures. |
| Internal 1.25V reference with hysteresis | 10mV hysteresis prevents oscillation during light-load transitions; enables stable regulation with minimal output capacitance (≥33μF). |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Powering low-power pulse oximeter or glucose monitor with CR2032 coin cell and 3.3V MCU/ADC. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V at ≤150mA with micropower sleep mode between measurements. Use Value: 12μA quiescent current extends single-cell battery life beyond 2 years; Burst Mode® eliminates audible noise during signal acquisition. |
Use Scenario: Supplying 5V to LIN transceiver and microcontroller in door module powered by 12V vehicle battery. IC Role / Device Role / Timing Role: Input-tolerant buck converter handling cold-crank (6.5V) to load-dump (34V) transients without external TVS. Use Value: 34V absolute max input rating and robust current limiting protect against automotive surge events; DFN package withstands under-hood thermal cycling. |
| Industrial Wireless Sensor Nodes | Smart Energy Metering Subsystems |
|
Use Scenario: Regulating 3.3V for LoRaWAN transceiver and temperature/humidity sensor in battery-operated field node. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating across wide temperature range (−40°C to +85°C) with minimal external components. Use Value: 73.5°C/W θJA enables full 300mA output without heatsink in sealed IP67 enclosure; 1.25V FB reference ensures accuracy over temperature. |
Use Scenario: Providing isolated 5V rail for metrology ADC and real-time clock in electricity meter with backup supercapacitor. IC Role / Device Role / Timing Role: Primary supply for precision analog section, with shutdown control synchronized to power-fail detection. Use Value: <1μA shutdown current preserves supercapacitor energy for >30 days during mains outage; fast current limit protects against meter tampering faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EDCB#TRPBF | Higher 40V input rating, 500mA output, synchronous rectification, 2.5MHz switching - requires external compensation and has higher IQ (25μA). | Better suited for high-density, high-efficiency designs where board space is constrained and input may exceed 34V. | Select LTC3642EDCB#TRPBF when needing >300mA output or synchronous efficiency >92% at 100mA; not drop-in due to different pinout and control scheme. |
| TPS62130ARGTR | 3–17V input, 3A output, 2.5MHz sync buck, 17μA IQ - uses CMOS switch, smaller 3mm × 3mm QFN, but lacks 34V tolerance and Burst Mode®. | Ideal for 5V/12V intermediate bus conversion in consumer electronics where input is tightly regulated. | Choose TPS62130ARGTR for cost-sensitive, high-current applications below 17V input; not suitable for automotive or industrial unregulated inputs. |
Compared with LT1934EDCB#TRPBF, LTC3642EDCB#TRPBF offers higher voltage headroom and synchronous efficiency but increases BOM count and layout complexity, while TPS62130ARGTR delivers greater current at lower cost in benign input environments but cannot replace LT1934EDCB#TRPBF in 34V-capable or micropower-critical systems.
Availability
LT1934EDCB#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1934EDCB#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1934 series belongs to ADI's legacy micropower DC/DC converter product line, engineered specifically for battery-powered instrumentation, remote sensors, and industrial controls where ultra-low quiescent current and wide input voltage tolerance are mandatory.
FAQ
What is the maximum output current capability of the LT1934EDCB#TRPBF?
The LT1934EDCB#TRPBF supports up to 300mA of continuous output current when configured for 3.3V or 5V regulation with appropriate external components (e.g., 47μH inductor, 100μF output capacitor). This rating assumes operation within the −40°C to +85°C ambient range and proper thermal management via the exposed pad. Peak current limit is 400mA, with derating above 85°C ambient per the datasheet's thermal curves.
Does the LT1934EDCB#TRPBF require an external compensation network?
No, the LT1934EDCB#TRPBF uses a hysteretic Burst Mode® control architecture with internal compensation and does not require external compensation components. Its stability is inherent to the fixed off-time, current-mode topology - simplifying design and reducing bill-of-materials. Only standard input/output capacitors, inductor, catch diode, and feedback resistors are needed for full operation.
Can the LT1934EDCB#TRPBF operate with a 3.3V input to generate 3.3V output?
No - the LT1934EDCB#TRPBF is a step-down (buck) converter with minimum input voltage dictated by its ~3.2V undervoltage lockout and maximum duty cycle (~85%). To regulate 3.3V output, the input must exceed approximately 4.5V (per datasheet Figure G12). For 3.3V-in-to-3.3V-out applications, a low-dropout linear regulator or buck-boost topology is required instead.
What is the purpose of the BOOST pin on the LT1934EDCB#TRPBF?
The BOOST pin on the LT1934EDCB#TRPBF supplies elevated drive voltage to fully saturate the internal bipolar NPN power switch, ensuring low VCE(SAT) (200mV at 300mA) and high efficiency. It requires an external 0.1μF capacitor and fast diode (e.g., 1N4148) connected between SW and BOOST pins. Proper BOOST voltage (>2.5V above SW) is essential for optimal switch performance across the full input range.
Is the LT1934EDCB#TRPBF RoHS-compliant and lead-free?
Yes, the LT1934EDCB#TRPBF carries a lead-free finish and complies with RoHS Directive 2011/65/EU. The "#TRPBF" suffix explicitly denotes tape-and-reel packaging with lead-free (Pb-free) termination. Full compliance documentation, including SGS test reports and material declarations, is available through Analog Devices' official product page and authorized distributors.
LT1934EDCB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT1934EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934EDCB#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 LT1934EDCB#TRPBF reliable?
The price and inventory of LT1934EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1934EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934EDCB#TRPBF?
LT1934EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934EDCB#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 LT1934EDCB#TRPBF?
For technical support, including LT1934EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934EDCB#TRPBF requirements.
6.How does Aetrix verify that LT1934EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1934EDCB#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 LT1934EDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1934EDCB#TRPBF?
All LT1934EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934EDCB#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 LT1934EDCB#TRPBF part is unused and in its original packaging.
Return procedure for LT1934EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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