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Analog Devices Inc. LT1934ES6#TRPBF
- Part No.:
- LT1934ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934ES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
LT1934ES6#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-down DC/DC converter with integrated 400mA bipolar NPN switch, designed for wide-input industrial and battery-powered systems. It operates from 3.2V to 34V input, delivers up to 300mA at 3.3V or 5V output, features 12μA quiescent current, Burst Mode® operation, and low 200mV VCE(SAT) at 300mA - enabling high-efficiency regulation in space-constrained portable and automotive standby supplies.
For engineers reviewing the LT1934ES6#TRPBF datasheet, LT1934ES6#TRPBF pinout, LT1934ES6#TRPBF application, or LT1934ES6#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to TSOT-23-6, real-world efficiency curves, and two rigorously cross-checked alternative parts for 3.3V/5V micropower buck conversion.
Technical Context
The LT1934ES6#TRPBF uses Burst Mode® control with fixed 1.8μs off-time and regulated on-time to maintain output regulation across load currents from 0.1mA to 300mA. Its internal bipolar NPN switch is driven via a BOOST pin requiring external diode-capacitor charge pump to achieve full saturation - critical for low VCE(SAT) and high efficiency at light loads.
Feedback regulation targets 1.25V at the FB pin with ±10mV hysteresis; undervoltage lockout activates below ~3.2V; shutdown disconnects VIN current to <1μA. The device implements fast current limiting (400mA typical), thermal foldback, and fixed-frequency switching behavior that transitions into discontinuous conduction mode at light loads.
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 pre-regulation. |
| Output Current | Up to 300mA - enables direct powering of microcontrollers, sensors, and RF modules from unregulated sources. |
| Quiescent Current | 12μA - extends battery life in always-on IoT nodes and remote sensors operating for years on coin cells. |
| FB Reference Voltage | 1.25V ±2% - sets precise output via resistor divider; enables stable 3.3V or 5V generation with <±1% accuracy over temperature. |
| VCE(SAT) | 200mV at 300mA - minimizes conduction loss and improves efficiency above 10mA load, especially critical in 3.3V/5V conversion. |
| Shutdown Current | <1μA - fully isolates load from input during deep sleep, eliminating parasitic drain in battery backup systems. |
| Switching Frequency | Variable (Burst Mode®) - reduces switching losses at light loads; maintains >70% efficiency down to 0.1mA output current. |
Pinout & Package
LT1934ES6#TRPBF is packaged in a 6-lead ThinSOT™ (TSOT-23-6) plastic package, 1mm profile, with exposed pad not present (DFN variant has exposed GND pad; TSOT-23 does not). Pin 1 is BOOST, Pin 2 is GND, Pin 3 is FB, Pin 4 is SHDN, Pin 5 is VIN, Pin 6 is SW - matching standard S6 marking layout and JEDEC MO-178AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge-pump voltage supply for switch driver | Must be ≥2.5V above SW to saturate internal NPN; requires external 0.1μF capacitor + Schottky diode tied to SW or VOUT. |
| GND (Pin 2) | Power and signal reference ground | Primary return path for feedback divider, internal regulators, and switch emitter; must connect to low-impedance local ground plane. |
| FB (Pin 3) | Feedback voltage sensing input | Regulated to 1.25V; sets output via R1/R2 divider; hysteresis enables stable Burst Mode® entry/exit without oscillation. |
| 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 and switch collector; requires local 2.2μF ceramic bypass; withstands 34V absolute max. |
| SW (Pin 6) | Switch collector node | Drives external inductor and catch diode; swings from VIN to ~−0.4V (diode clamp); carries peak 400mA pulsed current. |
Key Features
| Feature | Design Value |
|---|---|
| Wide 3.2V–34V input range | Eliminates need for pre-regulators in automotive, industrial, and multi-battery systems - accepts raw lead-acid or wall transformer inputs. |
| 12μA quiescent current | Enables >10-year battery life in low-duty-cycle sensor nodes powered by CR2032 or AA alkaline cells. |
| Burst Mode® operation | Maintains >80% efficiency at 100μA load - essential for always-on monitoring circuits where standby power dominates lifetime energy use. |
| Integrated 400mA NPN switch | Reduces BOM count by eliminating external MOSFET; 200mV VCE(SAT) ensures minimal dropout and thermal rise at full load. |
| Low-profile TSOT-23-6 package | 1mm height enables ultra-thin designs in wearables, medical patches, and compact IoT edge devices. |
Applications
| Automotive Battery Regulation | Standby Power for Portable Products |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V for CAN transceiver or infotainment MCU during ignition-off state. IC Role / Device Role / Timing Role: Primary buck regulator supplying always-on domain; manages wake-up signals and low-power memory retention. Use Value: 12μA quiescent current prevents parasitic battery drain; 34V input rating survives load-dump transients up to 34V. |
Use Scenario: Powering BLE SoC and environmental sensor in a wireless asset tracker operating on two AA alkaline cells. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V at burst loads ≤250mA while maintaining sub-15μA sleep current. Use Value: Burst Mode® sustains >85% efficiency at 50μA load; wide input allows operation down to 3.2V per cell (6.4V total). |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to clean 5V for USB peripheral hub or PoE-powered accessory. IC Role / Device Role / Timing Role: Post-regulator ensuring stable 5V despite input ripple and line variation; handles 300mA peak USB charging loads. Use Value: 400mA current limit and fast short-circuit protection prevent damage during hot-plug events; 200mV VCE(SAT) limits thermal stress. |
Use Scenario: Local 3.3V rail generation on a modular PLC I/O board where main 24V bus feeds multiple isolated DC/DC stages. IC Role / Device Role / Timing Role: Point-of-load regulator minimizing voltage drop and noise coupling between modules; operates independently of upstream converters. Use Value: TSOT-23-6 footprint saves PCB area vs. larger buck ICs; 3.2V–34V range accommodates aging or undersized 24V supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EDD#PBF | Higher 40V input, 350mA output, 4.5μA IQ, but requires external MOSFETs and compensation components. | Used where higher input voltage margin or adjustable frequency is required; not pin-compatible. | Select when needing >34V input tolerance or programmable soft-start; avoid if minimizing BOM count is critical. |
| TPS62840DRVR | Lower 1.8V–6.5V input, 1.8μA IQ, 600mA output, integrated inductor option; no BOOST pin or bipolar switch. | Optimized for single-cell Li-ion or 3.3V logic rails; unsuitable for 12V+ inputs or high-VIN industrial use. | Choose for ultra-low-IQ battery-only systems under 6.5V; reject for automotive or wall-adapter applications requiring >6.5V input. |
Compared with LTC3642EDD#PBF and TPS62840DRVR, the LT1934ES6#TRPBF uniquely balances 34V input capability, integrated bipolar switch, and 12μA quiescent current in a 6-pin TSOT-23 - making it the only option among the three that supports direct 24V automotive battery regulation without external FETs or complex compensation.
Availability
LT1934ES6#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, wall transformer post-regulation, and standby power for portable products requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LT1934ES6#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 DC/DC conversion in battery-backed and industrial systems - prioritizing ultra-low IQ, robust input voltage range, and integrated switch simplicity over high-frequency switching or digital control.
FAQ
What is the maximum output current capability of the LT1934ES6#TRPBF?
The LT1934ES6#TRPBF supports up to 300mA output current when configured for 3.3V or 5V regulation with appropriate external components (e.g., 47μH inductor, 100μF output capacitor). Its internal 400mA bipolar switch and 200mV VCE(SAT) ensure reliable delivery of this current with minimal thermal rise. Derating applies above 85°C ambient.
Does the LT1934ES6#TRPBF require an external boost capacitor and diode?
Yes - the LT1934ES6#TRPBF requires an external boost capacitor (typically 0.1μF ceramic) and fast-switching diode (e.g., 1N4148 or BAT54) connected between SW and BOOST pins. This forms a charge pump to generate a voltage >2.5V above SW, ensuring full saturation of the internal NPN switch and optimal efficiency.
What is the shutdown current specification for the LT1934ES6#TRPBF?
The LT1934ES6#TRPBF achieves <1μA shutdown current when the SHDN pin is pulled to GND. In this state, all internal circuitry is disabled and VIN current drops to near-leakage levels - critical for long-term battery preservation in maintenance-free IoT deployments.
Can the LT1934ES6#TRPBF regulate from a 3.3V input to a 2.5V output?
No - the LT1934ES6#TRPBF is a step-down (buck) converter with minimum input voltage limited by its ~3.2V undervoltage lockout and maximum duty cycle (~85%). It cannot produce a regulated 2.5V output from a 3.3V input. For such low-dropout requirements, a linear regulator or buck-boost topology would be necessary.
Which package type corresponds to the LT1934ES6#TRPBF part number?
The LT1934ES6#TRPBF uses the 6-lead ThinSOT™ (TSOT-23-6) plastic package, marked "LTXP", with operating temperature range –40°C to +85°C. This is distinct from DFN variants (e.g., LT1934EDCB#TRPBF) which use a 2mm × 3mm exposed-pad package and different marking codes.
LT1934ES6#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:
- 300mA
- 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#TRPBF FAQ
1.How can I place an order for LT1934ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934ES6#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#TRPBF reliable?
The price and inventory of LT1934ES6#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1934ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934ES6#TRPBF?
LT1934ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934ES6#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#TRPBF?
For technical support, including LT1934ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934ES6#TRPBF requirements.
6.How does Aetrix verify that LT1934ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1934ES6#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1934ES6#TRPBF?
All LT1934ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934ES6#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1934ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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