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Analog Devices Inc. LT1934IDCB#TRMPBF
- Part No.:
- LT1934IDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1934IDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:510
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Product details
Overview
LT1934IDCB#TRMPBF 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 in a thermally enhanced 6-lead (2mm × 3mm × 0.8mm) DFN package with exposed ground pad, supporting automotive battery regulation and portable standby power systems.
For engineers reviewing the LT1934IDCB#TRMPBF datasheet, LT1934IDCB#TRMPBF pinout, LT1934IDCB#TRMPBF application, or LT1934IDCB#TRMPBF equivalent, key selection factors include its 12μA quiescent current, 200mV VCE(SAT) at 300mA, Burst Mode® operation, –40°C to 125°C operating range, and DFN thermal performance (θJA = 73.5°C/W).
Technical Context
The LT1934IDCB#TRMPBF uses Burst Mode® control with a fixed 1.8μs off-time and regulated on-time to maintain output regulation across wide load ranges. Its internal bipolar NPN switch is driven via a BOOST pin requiring external diode-capacitor charge pump to achieve full saturation above input voltage.
Feedback regulation targets 1.25V at the FB pin with ±10mV hysteresis; undervoltage lockout activates below ~3.2V (typical), and shutdown reduces VIN current to <1μA. The device implements fast current limiting (400mA peak) and frequency foldback during overload to protect against shorted outputs at up to 34V input.
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 direct powering of microcontrollers, sensors, and low-power logic from unregulated sources. |
| Quiescent Current | 12μA - minimizes battery drain in always-on standby circuits; drops to <1μA in shutdown mode. |
| Switch VCE(SAT) | 200mV at 300mA (DFN package) - reduces conduction loss and improves efficiency at medium loads. |
| Feedback Reference Voltage | 1.25V (±2%) - sets precise output via resistor divider; enables stable 3.3V or 5V generation with <0.5% line/load regulation. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
| Package Thermal Resistance | θJA = 73.5°C/W - enables higher continuous power dissipation than SOT-23 variants in space-constrained layouts. |
Pinout & Package
LT1934IDCB#TRMPBF is housed in a 6-lead plastic DFN package (2mm × 3mm × 0.8mm) with exposed thermal pad (Pin 7) that must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge-pump drive node | Accepts external diode-capacitor network to generate >VIN gate drive for bipolar switch saturation; requires ≥2.5V above SW for optimal efficiency. |
| GND (Pin 5) | Power and signal reference | Primary ground return for internal regulators, feedback comparator, and power switch; connects to exposed pad for lowest impedance path. |
| FB (Pin 6) | Regulation sense input | Monitored by internal 1.25V reference comparator; sets output voltage as VOUT = 1.25V × (1 + R1/R2); bias current <±60nA ensures minimal divider error. |
| SHDN (Pin 4) | Enable/disable control | Logic-level input: <0.25V = shutdown (<1μA IVIN), >2.3V = active; floating or tied to VIN for always-on operation. |
| VIN (Pin 3) | Main power input | Supplies internal LDO and switch driver; requires local 2.2μF ceramic bypass; withstands 34V absolute max. |
| SW (Pin 2) | Switch node | Drives external inductor and catch diode; swings between VIN and ~–0.4V (diode clamped); peak current limited to 400mA. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >80% efficiency down to 100μA load while holding quiescent current at 12μA - ideal for intermittent-sensing IoT nodes. |
| Integrated 400mA bipolar switch | Eliminates external MOSFET and driver; 200mV VCE(SAT) at 300mA reduces heat rise in DFN package vs. comparable CMOS solutions. |
| Wide 3.2V–34V input range | Directly regulates from automotive batteries (9V–16V), industrial 24V rails, and legacy wall adapters without front-end buck-boost stages. |
| Thermally enhanced DFN | Exposed pad and θJA = 73.5°C/W enable 2× higher continuous output current vs. TSOT-23 at same ambient temperature. |
| Fast current limiting & fault protection | 400mA peak limit responds within microseconds to shorted outputs - prevents damage even at 34V input with no external current-sense components. |
Applications
| Automotive Battery Regulation | Standby Power for Portable Products |
|---|---|
|
Use Scenario: Regulating 12V automotive battery supply to 3.3V for infotainment MCU during ignition-off sleep mode. IC Role / Device Role / Timing Role: Primary step-down regulator maintaining system wake-up logic and CAN transceiver bias during vehicle rest state. Use Value: 12μA quiescent current extends battery life beyond 6 months without recharge; 34V abs max rating survives load-dump transients. |
Use Scenario: Providing always-on 3.3V rail for real-time clock and sensor interface in handheld medical monitors. IC Role / Device Role / Timing Role: Micropower DC/DC converter enabling multi-year battery operation in low-duty-cycle data logging devices. Use Value: Burst Mode® sustains >85% efficiency at 50μA load; shutdown current <1μA eliminates parasitic drain when device is fully powered down. |
| Industrial Control Supplies | Distributed Supply Regulation |
|
Use Scenario: Generating isolated 5V supply from 24V PLC backplane for analog sensor signal conditioning circuitry. IC Role / Device Role / Timing Role: Local point-of-load regulator minimizing noise coupling into precision ADC references and op-amp stages. Use Value: Fixed 1.8μs off-time and low VCE(SAT) reduce output ripple to <20mVPP without additional LC filtering. |
Use Scenario: Powering remote I/O modules in factory automation networks where 48V PoE-derived input must be stepped down to 3.3V logic rails. IC Role / Device Role / Timing Role: High-input-voltage buck converter enabling single-stage conversion from 36–57V PoE+ sources. Use Value: 34V absolute maximum input rating allows direct connection to PoE+ midspan outputs without derating or external clamp circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EDDB#TRMPBF | 40V input, 350mA synchronous buck; 2.5μA IQ; requires external MOSFETs in older versions but LTC3642 integrates them. | Higher efficiency (>90% at 100mA) due to synchronous rectification; lacks Burst Mode®, uses pulse-skipping instead. | Select for higher efficiency at medium loads (>50mA); avoid if ultra-low IQ (<15μA) or Burst Mode® EMI profile is required. |
| TPS62130ARGTR | 6V max input; 3A output; 17μA IQ; 2.5MHz fixed-frequency PWM; no BOOST pin or bipolar switch architecture. | Not suitable for >6V inputs; optimized for compact 3.3V/5V USB-powered systems, not automotive or industrial high-VIN use cases. | Choose only for low-input-voltage, high-current applications where size and switching frequency are critical; incompatible with 12V+ sources. |
Compared with LTC3642EDDB#TRMPBF and TPS62130ARGTR, the LT1934IDCB#TRMPBF uniquely combines 34V input tolerance, 12μA quiescent current, and bipolar switch robustness in a thermally optimized DFN - making it irreplaceable for long-life, high-VIN micropower designs where synchronous efficiency gains are secondary to reliability and simplicity.
Availability
LT1934IDCB#TRMPBF 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#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 technical and manufacturing continuity for the LT® product family, including precision analog, power management, and signal chain ICs.
The LT1934 belongs to Linear's micropower DC/DC converter product line, engineered specifically for battery-critical and high-input-voltage industrial applications where ultra-low quiescent current, wide VIN range, and robust fault handling are mandatory.
FAQ
What is the maximum output current capability of the LT1934IDCB#TRMPBF?
The LT1934IDCB#TRMPBF supports up to 300mA of continuous output current when configured for 3.3V or 5V outputs with appropriate external components (e.g., 47μH inductor, 100μF output capacitor). Its internal bipolar switch is rated for 400mA peak current, and thermal performance in the DFN package enables sustained 300mA delivery at +85°C ambient with proper PCB copper area.
Does the LT1934IDCB#TRMPBF require an external BOOST capacitor and diode?
Yes, the LT1934IDCB#TRMPBF requires an external BOOST capacitor (typically 0.1μF ceramic) and fast-switching diode (e.g., 1N4148 or BAT54) connected between VIN and BOOST pins. This charge-pump network generates a voltage higher than VIN to fully saturate the internal bipolar NPN switch - omission results in excessive VCE(SAT), reduced efficiency, and potential thermal failure.
Can the LT1934IDCB#TRMPBF operate from a 48V input source?
No, the LT1934IDCB#TRMPBF has an absolute maximum input voltage rating of 34V. Applying 48V exceeds this limit and risks permanent damage. For 48V PoE+ or industrial 48V rail applications, consider upstream pre-regulation or alternative regulators such as the LT8640S (60V input) or LTC3642 (40V input), both of which maintain micropower features.
What is the purpose of the exposed pad on the LT1934IDCB#TRMPBF DFN package?
The exposed pad (Pin 7) on the LT1934IDCB#TRMPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane to achieve specified θJA = 73.5°C/W and ensure reliable operation at full load. Leaving it unconnected degrades thermal performance by >40°C/W and may cause premature thermal shutdown or parametric shift.
How does Burst Mode® operation improve light-load efficiency in the LT1934IDCB#TRMPBF?
Burst Mode® operation in the LT1934IDCB#TRMPBF disables the oscillator and power switch between energy pulses, reducing VIN current to just 12μA. During each burst, the device delivers a controlled packet of energy to the output capacitor, then returns to ultra-low-power sleep - achieving >80% efficiency at 100μA load while avoiding audible noise and EMI associated with fixed-frequency PWM at light loads.
LT1934IDCB#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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LT1934IDCB#TRMPBF FAQ
1.How can I place an order for LT1934IDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934IDCB#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#TRMPBF reliable?
The price and inventory of LT1934IDCB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934IDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934IDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934IDCB#TRMPBF?
LT1934IDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934IDCB#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#TRMPBF?
For technical support, including LT1934IDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934IDCB#TRMPBF requirements.
6.How does Aetrix verify that LT1934IDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934IDCB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934IDCB#TRMPBF?
All LT1934IDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934IDCB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934IDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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