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Analog Devices Inc. LT1934EDCB-1#TRPBF
- Part No.:
- LT1934EDCB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1934EDCB-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,293
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Product details
Overview
LT1934EDCB-1#TRPBF 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 standby power supplies.
For engineers reviewing the LT1934EDCB-1#TRPBF datasheet, LT1934EDCB-1#TRPBF pinout, LT1934EDCB-1#TRPBF application, or LT1934EDCB-1#TRPBF equivalent, key selection criteria include its 1.25V feedback reference, 1.8μs fixed off-time Burst Mode® control, 200mV typical VCE(SAT) at 75mA, –40°C to +85°C operating range, and compatibility with low-ESR ceramic or polymer output capacitors.
Technical Context
The LT1934EDCB-1#TRPBF uses a fixed-frequency Burst Mode® architecture with a 1.8μs off-time one-shot and adjustable on-time controlled 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 ±12mV via a resistor divider; output voltage is set as VOUT = 1.25V × (1 + R1/R2). Undervoltage lockout engages below ~3.2V, and shutdown reduces VIN current to <1μA when SHDN is pulled low.
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 | 60mA max - optimized for low-power standby rails where full 300mA capability is unnecessary and smaller magnetics are preferred. |
| Quiescent Current | 12μA typical - enables multi-year operation from coin cells or primary batteries in always-on monitoring circuits. |
| Feedback Reference Voltage | 1.25V ±12mV - allows precise output setting (e.g., 3.3V with 1% resistors) and stable regulation across temperature and line variations. |
| Switch VCE(SAT) | 70mV typical at 75mA - minimizes conduction loss and improves light-load efficiency versus higher-current variants. |
| Shutdown Current | <1μA - fully isolates load from source, eliminating parasitic drain in battery-backed systems during storage or sleep. |
| Fixed Off-Time | 1.8μs - defines minimum switching period and enables predictable frequency foldback during overload or startup. |
Pinout & Package
LT1934EDCB-1#TRPBF is packaged in a 6-lead (2mm × 3mm) plastic DFN with exposed thermal pad (Pin 7), rated for –40°C to +85°C operation. The exposed pad must be soldered to a 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; must exceed SW by ≥2.5V for full switch saturation. |
| GND (Pin 5) | Power and signal reference | Primary return path for internal regulators, feedback divider, and catch diode; connects directly to exposed pad. |
| FB (Pin 6) | Feedback input | Sensed at 1.25V; sets output voltage via resistor divider; high-impedance (±15nA bias) minimizes divider current error. |
| SHDN (Pin 4) | Enable/disable control | Logic-low (<0.25V) disables all circuitry; logic-high (≥2.3V) enables operation; floating or tied to VIN for always-on use. |
| VIN (Pin 3) | Main power input | Supplies internal bias and switch driver; requires local 2.2μF ceramic bypass close to pin to suppress switching noise. |
| SW (Pin 2) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed current up to 75mA peak. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >80% efficiency down to 100μA load by pulsing energy delivery-critical for intermittent sensor wake-ups. |
| Low 12μA quiescent current | Reduces battery depletion rate to <1% per year at 3.3V/10μA system load-enables decade-scale deployments. |
| Integrated 75mA current limit | Prevents destructive overcurrent during short-circuit or cold-start; eliminates need for external current-sense components. |
| 1.25V precision feedback reference | Enables accurate, resistor-based output programming (e.g., 3.3V ±1.5%) without trimming or calibration. |
| DFN package with exposed pad | Delivers 12°C/W junction-to-case thermal resistance-supports 60mA continuous output without heatsinking at +85°C ambient. |
Applications
| Portable Medical Sensor Node | Automotive Body Control Module Standby Rail |
|---|---|
|
Use Scenario: Ultra-low-power ECG front-end powered by CR2032 coin cell, waking every 5 seconds to sample and transmit data. IC Role / Device Role / Timing Role: Primary 3.3V standby regulator supplying MCU, ADC, and BLE radio during active bursts and deep-sleep intervals. Use Value: 12μA quiescent current extends battery life beyond 5 years; 60mA peak supports simultaneous analog sensing and wireless transmission. |
Use Scenario: Always-on microcontroller in door module monitoring window switches and interior lighting status. IC Role / Device Role / Timing Role: Secondary 5V rail generator from 12V automotive battery, active during ignition-off to maintain real-time clock and CAN wake detection. Use Value: 3.2V–34V input range tolerates cold-crank dips and load-dump transients; <1μA shutdown current prevents parasitic drain on vehicle battery. |
| Industrial IoT Edge Node | Smart Meter Backup Power Supply |
|
Use Scenario: Battery-buffered LoRaWAN node collecting temperature/humidity data in remote utility cabinets. IC Role / Device Role / Timing Role: Micropower 3.3V regulator for ultra-low-duty-cycle MCU and RF transceiver, activated only during scheduled transmissions. Use Value: Burst Mode® efficiency >85% at 100μA load ensures minimal energy waste between hourly reports; DFN footprint saves space in sealed enclosures. |
Use Scenario: Non-volatile memory and RTC backup supply in electricity meter, maintained by supercapacitor charged from main 5V rail. IC Role / Device Role / Timing Role: Low-noise 3.3V regulator sourcing <50mA from supercap during mains failure, enabling 72-hour data retention. Use Value: 70mV VCE(SAT) minimizes dropout across supercap discharge curve; 1.25V reference ensures stable memory voltage even as supercap decays to 3.0V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1934EDCB#TRPBF | Higher 300mA switch current limit; same package, pinout, and FB reference. | Supports higher-output-current loads (e.g., 3.3V/250mA), but requires larger inductor and input/output capacitors. | Select when output load exceeds 60mA or transient peaks demand >75mA; verify thermal margin with 47μH inductor. |
| TPS62231DRYR | CMOS synchronous buck; 300mA output; 2.05V–6.5V input; 17μA IQ; 2mm × 2mm WSON. | Requires lower input voltage (<6.5V); lacks BOOST pin; no Burst Mode®-uses PWM/PFM hybrid for light-load efficiency. | Choose for compact 3.3V/5V rails from Li-ion or USB sources where input voltage never exceeds 6.5V and layout space is critical. |
Compared with LT1934EDCB#TRPBF and TPS62231DRYR, the LT1934EDCB-1#TRPBF uniquely balances wide-input-range robustness (3.2V–34V), ultra-low IQ (12μA), and optimized 60mA capability in a thermally efficient DFN-making it ideal for battery-powered industrial and automotive standby supplies where input uncertainty and longevity are paramount.
Availability
LT1934EDCB-1#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial IoT edge nodes, and smart meter backup power supplies requiring stable component supply across extended product lifecycles.
Supply support for LT1934EDCB-1#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 its legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive-grade qualification.
The LT1934 family was designed specifically for micropower step-down regulation in space-constrained, battery-sensitive applications-emphasizing ultra-low quiescent current, wide input tolerance, and robust fault protection without external components.
FAQ
What is the maximum output current supported by the LT1934EDCB-1#TRPBF?
The LT1934EDCB-1#TRPBF supports up to 60mA of continuous output current when configured for 3.3V or 5V outputs. This is determined by its internal 75mA current-limit threshold and thermal design in the DFN package. Output current depends on inductor value, input voltage, and ambient temperature-Table 1 in the datasheet specifies 60mA with 150μH for 3.3V and 220μH for 5V under typical conditions. Exceeding this may trigger current limiting or thermal shutdown.
Does the LT1934EDCB-1#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1934EDCB-1#TRPBF 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 network generates a voltage higher than VIN to fully saturate the internal bipolar NPN switch. Without it, VCE(SAT) increases significantly, reducing efficiency and limiting output current capability-especially at low input voltages.
Can the LT1934EDCB-1#TRPBF operate with a 3.0V input supply?
No-the LT1934EDCB-1#TRPBF has a guaranteed minimum input voltage of 3.2V due to its undervoltage lockout (UVLO) threshold. Operation below 3.2V is not specified and will cause the device to disable. For 3.0V–3.2V inputs, consider alternatives like the TPS62231 (2.05V min) or add a low-dropout pre-regulator stage before the LT1934EDCB-1#TRPBF.
How does the LT1934EDCB-1#TRPBF achieve high efficiency at light loads?
The LT1934EDCB-1#TRPBF achieves >80% efficiency at loads as low as 100μA using Burst Mode® operation: it pulses energy in discrete bursts rather than continuous PWM, disabling most internal circuitry between pulses. Only the 12μA quiescent current flows during idle periods, minimizing total power draw while maintaining regulation-ideal for duty-cycled sensor nodes and standby rails.
Is the LT1934EDCB-1#TRPBF pin-compatible with the LT1934EDCB#TRPBF?
Yes-the LT1934EDCB-1#TRPBF is pin-compatible with the LT1934EDCB#TRPBF. Both share identical DFN-6 (2mm × 3mm) footprints, pin assignments, and thermal pad configuration. The only functional difference is the internal current limit (75mA vs. 300mA), so external components (inductor, input/output capacitors, catch diode) may need re-optimization for the lower-current variant to maximize efficiency and minimize size.
LT1934EDCB-1#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:
- 60mA
- 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-1#TRPBF FAQ
1.How can I place an order for LT1934EDCB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934EDCB-1#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-1#TRPBF reliable?
The price and inventory of LT1934EDCB-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1934EDCB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934EDCB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934EDCB-1#TRPBF?
LT1934EDCB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934EDCB-1#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-1#TRPBF?
For technical support, including LT1934EDCB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934EDCB-1#TRPBF requirements.
6.How does Aetrix verify that LT1934EDCB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1934EDCB-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1934EDCB-1#TRPBF?
All LT1934EDCB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934EDCB-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1934EDCB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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