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Analog Devices Inc. LT1934ES6-1#TRPBF
- Part No.:
- LT1934ES6-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934ES6-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 60MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,017
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Product details
Overview
LT1934ES6-1#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 6-lead ThinSOT-23 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 systems.
For engineers reviewing the LT1934ES6-1#TRPBF datasheet, LT1934ES6-1#TRPBF pinout, LT1934ES6-1#TRPBF application, or LT1934ES6-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves at 3.3V/5V outputs, exact thermal resistance values (θJA = 250°C/W), and two rigorously cross-referenced alternative parts for low-current buck regulation.
Technical Context
The LT1934ES6-1#TRPBF uses Burst Mode® control with fixed 1.8μs off-time and regulated on-time to maintain 1.25V feedback reference. Its internal bipolar NPN switch achieves 70mV VCE(SAT) at 75mA in ThinSOT, enabling high efficiency down to ultra-light loads.
It integrates undervoltage lockout (~3.2V), shutdown logic with <1μA leakage, and fast current limiting (120mA typical peak) - all optimized for battery-powered systems requiring stable 3.3V/5V rails from wide-input sources like alkaline stacks or wall adapters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 34V - supports 4-cell alkaline, 5V logic rails, unregulated wall transformers, and lead-acid batteries. |
| Output Current Capability | Up to 60mA at 3.3V or 5V - limited by 120mA internal current limit, enabling smaller external magnetics. |
| Quiescent Current | 12μA - enables multi-year battery life in always-on standby applications. |
| Shutdown Current | <1μA - fully disconnects load from input, simplifying power sequencing. |
| Feedback Reference Voltage | 1.25V ±2% - sets output via resistor divider: VOUT = 1.25V × (1 + R1/R2). |
| Switch VCE(SAT) | 70mV at 75mA - minimizes conduction loss and improves light-load efficiency. |
| Thermal Resistance θJA | 250°C/W - measured in standard JEDEC 2S2P board, defines maximum power dissipation at ambient. |
Pinout & Package
LT1934ES6-1#TRPBF is packaged in a 6-lead Plastic TSOT-23 (ThinSOT™), 1mm profile, with exposed pad not present in this variant (exposed pad applies only to DFN packages).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap drive voltage node | Supplies elevated gate drive to internal NPN switch; requires external diode + capacitor to generate ~VIN + VOUT. |
| GND (Pin 2) | Power and signal reference | Return path for internal regulator, feedback divider, and switch emitter; must connect to local ground plane. |
| FB (Pin 3) | Regulation sense input | Monitored by internal comparator; regulates output by holding at 1.25V; sets VOUT via resistive divider. |
| SHDN (Pin 4) | Enable/disable control | Logic-high ≥2.3V enables operation; grounded disables all circuitry, reducing VIN current to <1μA. |
| VIN (Pin 5) | Main power input | Supplies internal bias and switch collector; requires local 2.2μF ceramic bypass capacitor. |
| SW (Pin 6) | Switch collector output | Drives external inductor and catch diode; swings between VIN and ~–0.4V during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency at 100μA load by pulsing switch only when output droops below hysteresis threshold. |
| Low dropout internal switch | 70mV VCE(SAT) at 75mA reduces conduction loss and enables stable regulation even at VIN – VOUT < 1V. |
| Wide input range support | 3.2V to 34V operation allows single design to serve automotive battery (9–16V), industrial 24V, and multi-cell alkaline inputs. |
| Fast current limiting | 120mA peak limit protects against shorted outputs at full 34V input without external sensing components. |
| Minimal external component count | Requires only inductor, catch diode, feedback divider, and two capacitors - no compensation network needed. |
Applications
| Automotive Battery Regulation | Standby Power for Portable Products |
|---|---|
Use Scenario: Regulating 12V automotive battery to 3.3V for infotainment microcontroller sleep mode. IC Role / Device Role / Timing Role: Primary buck converter supplying always-on logic rail during vehicle ignition-off state. Use Value: 12μA quiescent current prevents parasitic battery drain; 34V absolute max rating withstands load-dump transients. | Use Scenario: Powering real-time clock and sensor interface in handheld medical device during battery-backed sleep. IC Role / Device Role / Timing Role: Micropower step-down regulator maintaining 3.3V supply while main system is powered down. Use Value: <1μA shutdown current extends shelf life; 60mA output suffices for RTC + I²C sensors without oversized magnetics. |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Converting unregulated 9–24V wall adapter output to clean 5V for USB-peripheral interface ICs. IC Role / Device Role / Timing Role: Post-regulator stabilizing noisy AC/DC adapter output before digital logic rails. Use Value: Wide 3.2–34V input absorbs line variation; 1.25V FB reference ensures tight 5V tolerance across temperature. | Use Scenario: Generating localized 3.3V supply for isolated CAN transceiver in industrial PLC backplane. IC Role / Device Role / Timing Role: Point-of-load converter delivering low-noise rail adjacent to noise-sensitive analog interface. Use Value: ThinSOT-23 footprint minimizes PCB area; Burst Mode® eliminates audible switching noise in EMI-sensitive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3675EFE-1#PBF | Higher 300mA output, 2.5V–5.5V input, integrated MOSFET, 25μA IQ | Requires lower input voltage; suited for 3.3V/5V system rails, not wide-input battery apps | Select if input is regulated 3.3V/5V and higher current is needed; not drop-in for 34V inputs. |
| TPS62231DRYR | 17μA IQ, 2.05–6.5V input, 300mA output, synchronous rectification | Narrower input range excludes 24V/34V sources; better for Li-ion or 5V bus-fed systems | Choose for compact 300mA designs with regulated input; incompatible with 34V automotive or wall-adapter use. |
Compared with LT1934ES6-1#TRPBF, LTC3675EFE-1#PBF offers higher current but lacks 34V tolerance, while TPS62231DRYR provides synchronous efficiency but cannot accept >6.5V input-making LT1934ES6-1#TRPBF uniquely suited for ultra-wide-input, ultra-low-IQ applications under 60mA.
Availability
LT1934ES6-1#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product standby power, and wall transformer post-regulation requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LT1934ES6-1#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 full technical support, manufacturing, and documentation for legacy Linear products including the LT1934 family.
The LT1934 series was designed specifically for micropower, wide-input-voltage DC/DC conversion in space-constrained battery-powered and industrial systems - emphasizing ultra-low quiescent current, robust fault protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for LT1934ES6-1#TRPBF?
The LT1934ES6-1#TRPBF has an absolute maximum input voltage rating of 34V, as specified in the Absolute Maximum Ratings table. This allows direct use with 24V industrial supplies, 32V lead-acid batteries, and unregulated wall adapters without external clamping. Operation above 34V risks permanent damage; sustained operation near 34V requires thermal derating per θJA = 250°C/W.
How does LT1934ES6-1#TRPBF differ from the standard LT1934 version?
The LT1934ES6-1#TRPBF features a reduced internal current limit of 120mA (vs. 400mA for LT1934), enabling optimized external component selection for loads ≤60mA. This yields smaller inductors (e.g., 100μH vs. 47μH), lower input ripple, and reduced fault current - making LT1934ES6-1#TRPBF ideal for ultra-low-power applications where full 300mA capability is unnecessary.
What output voltages can LT1934ES6-1#TRPBF regulate, and how is VOUT set?
The LT1934ES6-1#TRPBF is a programmable buck regulator that sets output voltage via external resistor divider on the FB pin. With its precise 1.25V feedback reference, it supports any VOUT ≥1.25V - commonly configured for 3.3V or 5V. For example, 3.3V uses R1 = 165kΩ and R2 = 100kΩ; 5V uses R1 = 300kΩ and R2 = 100kΩ. The LT1934ES6-1#TRPBF datasheet provides full calculation guidance.
Does LT1934ES6-1#TRPBF require an external catch diode, and what type is recommended?
Yes, LT1934ES6-1#TRPBF requires an external Schottky catch diode (D1) connected between SW and VOUT. A 0.5A, 40V-rated part such as ON Semiconductor MBR0540 is recommended - matching the 34V input rating and minimizing forward drop. Lower-VR diodes may improve efficiency but increase leakage, raising quiescent current at elevated temperatures.
What is the shutdown current of LT1934ES6-1#TRPBF, and how is shutdown activated?
The LT1934ES6-1#TRPBF draws less than 1μA in shutdown mode when the SHDN pin is pulled to GND. Shutdown is activated by applying ≤0.25V to SHDN; normal operation resumes when SHDN ≥2.3V. If shutdown is unused, SHDN may be tied to VIN - but grounding it is mandatory to achieve sub-μA quiescent draw in battery-critical applications.
LT1934ES6-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- TSOT-23-6
LT1934ES6-1#TRPBF FAQ
1.How can I place an order for LT1934ES6-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934ES6-1#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 LT1934ES6-1#TRPBF reliable?
The price and inventory of LT1934ES6-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934ES6-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1934ES6-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934ES6-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934ES6-1#TRPBF?
LT1934ES6-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934ES6-1#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 LT1934ES6-1#TRPBF?
For technical support, including LT1934ES6-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934ES6-1#TRPBF requirements.
6.How does Aetrix verify that LT1934ES6-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1934ES6-1#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 LT1934ES6-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1934ES6-1#TRPBF?
All LT1934ES6-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934ES6-1#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 LT1934ES6-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1934ES6-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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