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Analog Devices Inc. LT1934IDCB-1#TRMPBF
- Part No.:
- LT1934IDCB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1934IDCB-1#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,935
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Product details
Overview
LT1934IDCB-1#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 75mA current-limited bipolar NPN switch, housed in a 2mm × 3mm × 0.8mm 6-pin DFN 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 industrial sensors and automotive standby supplies.
For engineers reviewing the LT1934IDCB-1#TRMPBF datasheet, LT1934IDCB-1#TRMPBF pinout, LT1934IDCB-1#TRMPBF application, or LT1934IDCB-1#TRMPBF equivalent, key selection criteria include its 1.25V feedback reference, 1.8μs fixed off-time Burst Mode® control, 225mV VCE(SAT) at 75mA (DFN package), and –40°C to 125°C operating range for under-hood or industrial environments.
Technical Context
The LT1934IDCB-1#TRMPBF employs a fixed-frequency Burst Mode® architecture with a 1.8μs off-time one-shot and adjustable on-time governed by peak-current limiting. Its internal bipolar NPN switch is driven via an external BOOST capacitor–diode network to ensure saturation across the full input range.
Regulation is achieved by maintaining the FB pin at 1.25V using an internal precision reference and comparator with 10mV hysteresis. Shutdown disables all circuitry except leakage paths, reducing VIN current to <1μA, while undervoltage lockout engages below ~3.2V to prevent erratic startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 5V rails, wall adapters, and 12V/24V automotive batteries without external pre-regulation. |
| Output Current Capability | 60mA max - optimized for low-power microcontrollers, RTCs, and sensor interfaces where full 300mA capability is unnecessary. |
| Quiescent Current | 12μA typical - enables >1-year operation on coin cells in always-on monitoring nodes. |
| Feedback Reference Voltage | 1.25V ±20mV - sets output via resistor divider (VOUT = 1.25V × (1 + R1/R2)), enabling precise 3.3V or 5V regulation. |
| Switch VCE(SAT) | 225mV at 75mA (DFN package) - minimizes conduction loss and thermal rise in compact layouts. |
| Shutdown Current | <1μA - fully isolates load from input source, critical for zero-power sleep modes. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control cabinet deployment. |
Pinout & Package
LT1934IDCB-1#TRMPBF uses a 6-lead (2mm × 3mm) plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground for thermal and electrical integrity. Thermal resistance θJA = 73.5°C/W, θJC = 12°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge pump drive node | Accepts externally generated voltage ≥2.5V above SW to fully saturate internal NPN switch; requires 0.1μF capacitor and fast diode. |
| GND (Pin 2) | Power and signal reference | Primary ground return for internal regulators, feedback divider, and exposed pad; must connect to low-impedance local ground plane. |
| FB (Pin 3) | Feedback sensing input | Monitored by internal 1.25V comparator; open-loop regulation point determines output voltage accuracy and loop stability. |
| SHDN (Pin 4) | Enable/disable control | 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 and switch driver; requires local 2.2μF ceramic bypass capacitor near the pin. |
| SW (Pin 6) | Switch node output | Drives external inductor and catch diode; carries high dI/dt pulses-requires short, wide trace routing to minimize EMI. |
| Exposed Pad (Pin 7) | Thermal & electrical ground | Not electrically isolated; must be soldered to ≥1 cm² copper area for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >80% efficiency down to 100μA load by pulsing switch activity-eliminates light-load inefficiency common in PWM converters. |
| Fixed 1.8μs off-time control | Enables predictable frequency foldback during overload and simplifies EMI filtering versus variable-frequency architectures. |
| Integrated 75mA current limit | Protects IC and external components during output shorts-even at 34V input-without requiring external sense resistors. |
| Low-profile DFN package | 2mm × 3mm footprint with 0.8mm height enables ultra-compact designs in space-constrained IoT edge nodes and automotive modules. |
| 1.25V precision feedback reference | ±1.6% tolerance over temperature ensures stable 3.3V/5V outputs without trimming, reducing BOM count and calibration steps. |
Applications
| Automotive Battery Standby Supply | Industrial Sensor Node Power |
|---|---|
Use Scenario: Providing regulated 3.3V to CAN transceivers and microcontrollers during vehicle ignition-off state, powered directly from 12V battery. IC Role / Device Role / Timing Role: Primary buck regulator managing input transients, cold-crank dips (down to 3.2V), and load dump surges up to 34V. Use Value: 12μA quiescent current prevents battery drain over weeks; –40°C to 125°C rating ensures reliability in engine compartment mounting. | Use Scenario: Powering wireless temperature/humidity sensors in factory automation cabinets with unregulated 24V DC rails. IC Role / Device Role / Timing Role: Isolated step-down stage converting noisy industrial supply to clean 5V for ADCs and RF SoCs. Use Value: 225mV VCE(SAT) limits self-heating in sealed enclosures; DFN package withstands vibration and thermal cycling. |
| Portable Medical Monitor Sleep Mode | Distributed Control System Auxiliary Rail |
Use Scenario: Maintaining real-time clock and memory retention in handheld ECG monitors during multi-day standby between clinical use. IC Role / Device Role / Timing Role: Micropower supervisor delivering 3.3V from primary Li-ion cell (3.0–4.2V) or backup coin cell. Use Value: <1μA shutdown current extends shelf life; 1.25V reference enables accurate low-voltage brownout detection. | Use Scenario: Generating localized 5V rail for I/O expansion modules in PLC backplanes fed from shared 24V bus. IC Role / Device Role / Timing Role: Point-of-load regulator decoupling noise-sensitive logic from high-current motor drivers on same board. Use Value: Fixed off-time control avoids beat frequencies with other switching rails; DFN thermal pad improves long-term reliability under continuous 40°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621EDCB-1#TRMPBF | CMOS synchronous buck; 100mA output; 2.5μA IQ; 2.7–5.5V input | Requires lower input voltage; better efficiency above 10mA but lacks 34V input capability | Select when input is ≤5.5V and ultra-low IQ dominates design priority |
| TPS62231DRVR | Synchronous buck; 300mA output; 17μA IQ; 2.05–6.5V input; integrated FETs | Narrower input range; higher output current; no BOOST pin complexity | Select for cost-sensitive consumer applications with 3.3V/5V inputs and no high-voltage requirement |
Compared with LTC3621EDCB-1#TRMPBF and TPS62231DRVR, LT1934IDCB-1#TRMPBF uniquely supports 34V input with micropower operation-making it irreplaceable in automotive and industrial systems where wide VIN and battery longevity are non-negotiable.
Availability
LT1934IDCB-1#TRMPBF is available at Aetrix Electronics and suitable for automotive battery standby supplies, industrial sensor nodes, portable medical monitor sleep modes, and distributed control system auxiliary rails requiring stable component supply across extended temperature ranges.
Supply support for LT1934IDCB-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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT1934 family was designed specifically for micropower step-down regulation in harsh environments-targeting applications where wide input range, ultra-low quiescent current, and extended temperature operation are mandatory.
FAQ
What is the maximum output current of the LT1934IDCB-1#TRMPBF?
The LT1934IDCB-1#TRMPBF is rated for up to 60mA output current at 3.3V or 5V. This is enforced by its internal 75mA current limit, which is lower than the standard LT1934's 400mA limit-optimized for applications where smaller external components and reduced fault current are advantageous. Actual deliverable current depends on input voltage, inductor value, and thermal conditions, but 60mA represents the guaranteed continuous output under typical operating conditions.
Does the LT1934IDCB-1#TRMPBF require an external BOOST capacitor?
Yes, the LT1934IDCB-1#TRMPBF requires an external BOOST capacitor (typically 0.1μF) and fast-switching diode (e.g., 1N4148) connected between VIN and BOOST pins. This network generates a voltage higher than VIN to fully saturate the internal bipolar NPN switch-ensuring low VCE(SAT) and high efficiency across the full 3.2V–34V input range. Omitting or undersizing this capacitor causes poor regulation and excessive switch heating.
What is the function of the exposed pad on the LT1934IDCB-1#TRMPBF DFN package?
The exposed pad (Pin 7) on the LT1934IDCB-1#TRMPBF is electrically connected to GND and serves dual thermal and electrical purposes. It must be soldered to a minimum 1 cm² PCB copper area tied to the main ground plane to achieve the specified θJC = 12°C/W thermal resistance and reduce junction temperature rise. Failure to solder the pad degrades thermal performance and may cause premature thermal shutdown or parametric shift.
Can the LT1934IDCB-1#TRMPBF operate with a 3.0V input?
No-the LT1934IDCB-1#TRMPBF has a guaranteed minimum input voltage of 3.2V due to its undervoltage lockout (UVLO) threshold. Operation below 3.2V is not specified and may result in unstable regulation or failure to start. For 3.0V-compatible buck conversion, consider alternatives such as the LTC3621 series or TPS6223x family, which feature lower UVLO points.
How does Burst Mode® operation improve efficiency at light loads in the LT1934IDCB-1#TRMPBF?
Burst Mode® operation in the LT1934IDCB-1#TRMPBF disables the oscillator and power switch when output voltage exceeds the 1.25V feedback threshold, reducing VIN current to just 12μA. When load discharge lowers FB below 1.25V, the device resumes switching in short bursts-delivering discrete energy packets to maintain regulation. This eliminates continuous switching losses at light loads, sustaining >80% efficiency down to 100μA output current-far exceeding conventional PWM converters.
LT1934IDCB-1#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:
- 60mA
- 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-1#TRMPBF FAQ
1.How can I place an order for LT1934IDCB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934IDCB-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 LT1934IDCB-1#TRMPBF reliable?
The price and inventory of LT1934IDCB-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 LT1934IDCB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934IDCB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934IDCB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934IDCB-1#TRMPBF?
LT1934IDCB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934IDCB-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 LT1934IDCB-1#TRMPBF?
For technical support, including LT1934IDCB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934IDCB-1#TRMPBF requirements.
6.How does Aetrix verify that LT1934IDCB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934IDCB-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 LT1934IDCB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934IDCB-1#TRMPBF?
All LT1934IDCB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934IDCB-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 LT1934IDCB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934IDCB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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