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Analog Devices Inc. LT1934IDCB#TRPBF
- Part No.:
- LT1934IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1934IDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,493
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Product details
Overview
LT1934IDCB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 400mA bipolar NPN power switch, designed for high-efficiency regulation from 3.2V to 34V inputs down to 3.3V or 5V outputs. It delivers up to 300mA output current, features 12μA quiescent current and <1μA shutdown current, and operates in Burst Mode® for extended battery life in portable systems such as automotive standby supplies and industrial control rails.
For engineers reviewing the LT1934IDCB#TRPBF datasheet, LT1934IDCB#TRPBF pinout, LT1934IDCB#TRPBF application, or LT1934IDCB#TRPBF equivalent, this page provides verified package mapping (6-lead DFN, 2mm × 3mm), confirmed pin functions (BOOST, GND, FB, SHDN, VIN, SW), thermal specs (–40°C to 125°C), and real-world efficiency curves across 0.1–100mA load range at 3.3V/5V outputs.
Technical Context
The LT1934IDCB#TRPBF uses a fixed-frequency Burst Mode® control architecture with internal 1.25V feedback reference and hysteresis-based regulation. Its bipolar NPN switch achieves 225mV VCE(SAT) at 300mA in the DFN package, enabling high efficiency even at light loads. The 1.8μs fixed off-time and adjustable on-time deliver precise duty-cycle control up to 88% maximum.
It integrates undervoltage lockout (~3.2V), fast current limiting (400mA typical), and BOOST pin drive for switch saturation-requiring external diode and capacitor to generate >VIN voltage. The exposed pad (Pin 7) is GND and must be soldered to PCB ground plane for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 5V logic rails, wall transformers, and lead-acid batteries without external pre-regulation. |
| Output Current Capability | Up to 300mA - sufficient for microcontroller cores, sensors, and low-power peripherals in embedded systems. |
| Quiescent Current | 12μA - enables multi-year battery operation in always-on monitoring applications. |
| Shutdown Current | <1μA - fully disconnects load from input source, critical for zero-power sleep modes. |
| Switch VCE(SAT) | 225mV at 300mA (DFN package) - minimizes conduction loss and improves efficiency at medium loads. |
| Feedback Reference Voltage | 1.25V ±20mV - sets output via resistor divider; enables precise 3.3V (R1/R2 = 1.64) or 5V (R1/R2 = 3.0) configurations. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT1934IDCB#TRPBF is housed in a 6-lead plastic DFN package (2mm × 3mm × 0.8mm) with exposed thermal pad (Pin 7, GND). This compact, low-profile封装 supports high-density layouts and enhanced thermal dissipation (θJA = 73.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Boost capacitor drive node | Supplies elevated gate drive voltage to saturate internal NPN switch; requires external diode + capacitor tied to SW or VIN. |
| GND (Pin 2) | Power and signal ground reference | Return path for internal regulators, feedback divider, and exposed pad; must connect to low-impedance PCB ground plane. |
| FB (Pin 3) | Feedback voltage sensing input | Regulated to 1.25V; sets output voltage via R1/R2 divider; hysteresis enables Burst Mode® transition. |
| SHDN (Pin 4) | Enable/disable control input | Logic-high ≥2.3V enables operation; grounded disables all circuitry and reduces VIN current to <1μA. |
| VIN (Pin 5) | Main power input | Supplies internal bias regulator and switch driver; requires local 2.2μF ceramic bypass capacitor. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode cathode, and boost capacitor; carries high dI/dt switching current. |
| Exposed Pad (Pin 7) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane for thermal management (θJC = 12°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency down to 0.1mA load by pulsing switch only when output droops below hysteresis threshold. |
| Integrated 400mA NPN switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained designs. |
| Wide input range (3.2V–34V) | Accepts unregulated sources directly-no need for upstream LDO or buck pre-regulator in automotive or industrial power trees. |
| Low-profile DFN package | 2mm × 3mm footprint with 0.8mm height enables ultra-thin portable and automotive modules where SOT-23 height is prohibitive. |
| Robust short-circuit protection | Fast current limit (400mA) and thermal shutdown prevent damage during output faults-even at 34V input. |
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 rail. IC Role / Device Role / Timing Role: Primary step-down regulator providing always-on low-power supply with <1μA shutdown current. Use Value: Enables cold-cranking compatibility and extends battery life during weeks-long vehicle dormancy. |
Use Scenario: Powering real-time clock and sensor interface in handheld medical devices between charging cycles. IC Role / Device Role / Timing Role: Micropower DC/DC converter maintaining regulated 3.3V from depleting alkaline cells. Use Value: 12μA IQ extends usable battery life beyond 5 years in intermittent-use applications. |
| Distributed Supply Regulation | Industrial Control Supplies |
Use Scenario: Local 5V rail generation on I/O module PCBs fed from shared 24V backplane. IC Role / Device Role / Timing Role: Point-of-load regulator minimizing IR drop and noise coupling in distributed architectures. Use Value: High PSRR and low EMI due to fixed off-time control reduce interference with analog sensor signals. |
Use Scenario: Providing isolated 3.3V logic supply for PLC digital input cards operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust primary regulator surviving 34V transients and –40°C to +125°C ambient extremes. Use Value: Guaranteed operation across full industrial temperature range eliminates derating and field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EDD#PBF | Higher 40V input rating, 2MHz switching, 120mA output; uses CMOS synchronous rectification instead of bipolar switch. | Lower IQ (12μA same), but optimized for higher-frequency, smaller-inductor designs-not suitable for 34V transient-heavy automotive use. | Select LTC3642EDD#PBF only if board space is constrained and input stays ≤28V; LT1934IDCB#TRPBF remains superior for 34V tolerance and thermal robustness in DFN. |
| TPS62130ARGTR | Synchronous buck, 3–17V input, 3A output, 17μA IQ; QFN-16 package (3mm × 3mm), no exposed pad requirement. | Higher output current and efficiency above 100mA, but lacks 34V capability and automotive temp grade; not rated for lead-acid or unregulated wall adapters. | Choose TPS62130ARGTR for cost-sensitive consumer apps needing >300mA; LT1934IDCB#TRPBF is mandatory for wide-input, high-temp, or safety-critical industrial use. |
Compared with LTC3642EDD#PBF and TPS62130ARGTR, LT1934IDCB#TRPBF uniquely combines 34V absolute max input, –40°C to +125°C operation, and 12μA quiescent current in a thermally optimized 2mm × 3mm DFN-making it irreplaceable for ruggedized, battery-backed, or automotive-grade step-down regulation where input uncertainty and ambient extremes dominate design constraints.
Availability
LT1934IDCB#TRPBF 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 LT1934IDCB#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LT1934 family.
The LT1934 series was designed specifically for micropower, wide-input-voltage DC/DC conversion in space- and energy-constrained systems-targeting automotive, industrial, and portable equipment where reliability across temperature and input variation is non-negotiable.
FAQ
What is the maximum input voltage rating for LT1934IDCB#TRPBF?
The LT1934IDCB#TRPBF has an absolute maximum input voltage rating of 34V, as specified in the Absolute Maximum Ratings table. This allows direct regulation from unregulated 24V industrial rails, 32V lead-acid batteries, and 34V wall adapters without external clamping. Operation above 34V risks permanent damage; sustained operation near 34V requires careful thermal design due to increased power dissipation in the internal switch.
Does LT1934IDCB#TRPBF support 3.3V and 5V output configurations?
Yes, LT1934IDCB#TRPBF supports both 3.3V and 5V outputs using the same feedback divider topology. With VFB = 1.25V, a 3.3V output requires R1/R2 = 1.64 (e.g., 164kΩ/100kΩ), while 5V requires R1/R2 = 3.0 (e.g., 300kΩ/100kΩ). Efficiency curves in the datasheet confirm ≥85% at 250mA for 3.3V and ≥88% at 250mA for 5V across 4.5–34V input range.
How does the BOOST pin function in LT1934IDCB#TRPBF?
The BOOST pin in LT1934IDCB#TRPBF supplies elevated drive voltage to fully saturate the internal bipolar NPN switch. It requires an external diode (e.g., BAT54) and capacitor (0.1–0.22μF) connected between BOOST and SW (or VIN). For 3.3V+ outputs, the standard BOOST-to-SW configuration is used; for lower outputs, BOOST-to-VIN may be preferred. Minimum BOOST-to-SW voltage must exceed 2.5V for optimal efficiency.
What is the thermal performance of LT1934IDCB#TRPBF in its DFN package?
LT1934IDCB#TRPBF in the 6-lead DFN package (2mm × 3mm) achieves θJA = 73.5°C/W and θJC = 12°C/W when the exposed pad (Pin 7) is soldered to a minimum 100mm² PCB copper pour. This enables continuous 300mA output at +85°C ambient with ≤25°C junction rise-critical for sealed enclosures and automotive under-dash installations where airflow is limited.
Can LT1934IDCB#TRPBF replace LT1934ES6#TRPBF in existing designs?
LT1934IDCB#TRPBF is not a direct pin-compatible replacement for LT1934ES6#TRPBF due to different packages (DFN vs TSOT-23) and pinouts. While both share identical electrical specs and temperature range (–40°C to +125°C), the DFN requires PCB redesign: 6-pin layout differs (Pin 1 BOOST / Pin 2 GND / Pin 3 FB / Pin 4 SHDN / Pin 5 VIN / Pin 6 SW), and the exposed pad must be grounded. Thermal and EMI performance improves, but mechanical fit is not interchangeable.
LT1934IDCB#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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LT1934IDCB#TRPBF FAQ
1.How can I place an order for LT1934IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934IDCB#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 LT1934IDCB#TRPBF reliable?
The price and inventory of LT1934IDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934IDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1934IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934IDCB#TRPBF?
LT1934IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934IDCB#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 LT1934IDCB#TRPBF?
For technical support, including LT1934IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934IDCB#TRPBF requirements.
6.How does Aetrix verify that LT1934IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1934IDCB#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 LT1934IDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1934IDCB#TRPBF?
All LT1934IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934IDCB#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 LT1934IDCB#TRPBF part is unused and in its original packaging.
Return procedure for LT1934IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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