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Analog Devices Inc. LT1934ES6-1#TRMPBF
- Part No.:
- LT1934ES6-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1934ES6-1#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 60MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
LT1934ES6-1#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 6-lead TSOT-23 (ThinSOT™) package. It operates from 3.2V to 34V input, delivers up to 60mA at 3.3V or 5V output, features 12μA quiescent current and <1μA shutdown current, and targets low-power battery regulation in portable and automotive standby systems.
For engineers reviewing the LT1934ES6-1#TRMPBF datasheet, LT1934ES6-1#TRMPBF pinout, LT1934ES6-1#TRMPBF application, or LT1934ES6-1#TRMPBF equivalent, key selection criteria include its 75mA internal current limit, 1.25V feedback reference, Burst Mode® operation for light-load efficiency, and compatibility with 3.3V/5V fixed-output designs using external resistor dividers.
Technical Context
The LT1934ES6-1#TRMPBF uses a Burst Mode® control architecture with a fixed 1.8μs off-time one-shot and adjustable on-time, enabling high efficiency across 0.1–60mA load range. Its internal bipolar NPN switch achieves 70mV VCE(SAT) at 75mA (S6 package), driven via BOOST pin voltage ≥2.5V above SW.
Regulation relies on a precision 1.25V ±2% feedback comparator with 10mV hysteresis and 2nA bias current. Undervoltage lockout activates below 3.2V (typ), and shutdown disables all circuitry except leakage paths, reducing VIN current to <1μA.
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 60mA - determined by 75mA internal current limit; enables compact inductor/capacitor selection per Table 1 in datasheet. |
| Quiescent Current | 12μA (typ) - sustains >1-year battery life in always-on sensor nodes powered by CR2032 or AA cells. |
| Feedback Reference Voltage | 1.25V ±2% - sets output via R1/R2 divider; enables precise 3.3V (R1 = 1.64kΩ, R2 = 1kΩ) or 5V (R1 = 2.98kΩ, R2 = 1kΩ) regulation. |
| Switch VCE(SAT) | 70mV at 75mA (S6 package) - minimizes conduction loss, supporting >85% efficiency at 10mA–60mA loads with 12V input. |
| Shutdown Current | <1μA - fully isolates load from input source, critical for zero-power sleep modes in portable instrumentation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood standby applications. |
Pinout & Package
LT1934ES6-1#TRMPBF is packaged in a 6-lead plastic TSOT-23 (ThinSOT™), 1mm profile, with exposed pad not present (DFN variant has exposed GND pad; S6 does not).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Bootstrap drive voltage supply | Must be ≥2.5V above SW to saturate internal NPN switch; requires external diode + capacitor (e.g., 0.1μF + BAT54). |
| GND (2) | Power and signal reference ground | Return path for FB divider, SHDN logic, and internal regulators; must connect to low-impedance local ground plane. |
| FB (3) | Feedback voltage sensing node | Regulated to 1.25V; connects to resistor divider tap; 2nA bias current enables high-value resistors (>1MΩ) to minimize divider power loss. |
| SHDN (4) | Enable/disable control input | Logic-low (<0.25V) forces full shutdown (<1μA IVIN); logic-high (≥2.3V) enables operation; floating or tied to VIN for always-on use. |
| VIN (5) | Main power input | Supplies internal regulator and switch driver; requires local 2.2μF ceramic bypass capacitor near pin to suppress switching noise. |
| SW (6) | Internal switch collector node | Connects to inductor, catch diode anode, and BOOST capacitor cathode; switches between VIN and ~0.07V (at 75mA). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >80% efficiency down to 100μA load by pulsing switch only when output droops below hysteresis threshold. |
| Low VCE(SAT) bipolar switch | 70mV drop at 75mA reduces thermal stress and enables use of smaller inductors (e.g., 100μH for 3.3V/60mA) vs. MOSFET-based alternatives. |
| Integrated current limiting | Fixed 75mA peak switch current protects against short-circuited outputs even at 34V input, eliminating need for external foldback circuitry. |
| Wide input voltage range | 3.2V–34V accommodates unregulated sources like automotive batteries (9–16V), industrial 24V rails, and multi-cell alkaline stacks without derating. |
| Ultra-low shutdown current | <1μA ensures no measurable drain on backup batteries during system sleep, critical for medical wearables and remote sensors. |
Applications
| Automotive Battery Standby Supply | Portable Medical Sensor Node |
|---|---|
Use Scenario: Powering CAN transceiver and microcontroller in vehicle infotainment head unit during ignition-off mode. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying always-on logic and wake-up circuitry from 12V battery. Use Value: 12μA quiescent current extends battery life beyond 6 months without recharge; 34V abs max rating withstands load-dump transients. |
Use Scenario: Regulating power for ECG front-end amplifier and BLE SoC in disposable patch monitor. IC Role / Device Role / Timing Role: Micropower 3.3V supply enabling multi-week operation from single CR2032 coin cell. Use Value: <1μA shutdown current prevents cell depletion during storage; TSOT-23 footprint fits ultra-thin wearable form factor. |
| Industrial IoT Edge Controller | Smart Meter Auxiliary Rail |
Use Scenario: Generating isolated 5V rail for RS-485 transceiver and real-time clock in factory-floor PLC module. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 24V field bus, operating continuously during mains outage. Use Value: 3.2V–34V input range accepts degraded 24V bus (down to 18V) while maintaining regulation; -40°C to +85°C rating ensures reliability in harsh enclosures. |
Use Scenario: Providing stable 3.3V for metrology ADC and tamper-detection logic in electricity meter with lithium backup. IC Role / Device Role / Timing Role: Low-noise auxiliary regulator decoupled from main SMPS to avoid measurement interference. Use Value: 10mV FB hysteresis and 1.25V reference enable sub-0.5% output accuracy over temperature; minimal EMI supports Class B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3675EFE-1#PBF | 4-channel PMIC with one 300mA buck; 25μA IQ; 2.7–5.5V input; QFN-28 | Requires external components for >5.5V input; higher integration but larger footprint and cost | Choose for multi-rail systems needing coordinated sequencing; not suitable for direct 34V input replacement |
| TPS62240DRVR | 600mA synchronous buck; 22μA IQ; 2.0–6.5V input; 6-WSON | Narrower input range excludes wall adapters and automotive battery direct connection | Prefer for space-constrained 3.3V/5V systems with ≤6.5V input and need for higher current; no BOOST pin complexity |
Compared with LTC3675EFE-1#PBF and TPS62240DRVR, LT1934ES6-1#TRMPBF uniquely supports 34V input with micropower operation in a 2.9mm² TSOT-23 package, making it optimal for high-voltage, ultra-low-quiescent standalone regulation where input voltage exceeds 6.5V.
Availability
LT1934ES6-1#TRMPBF is available at Aetrix Electronics and suitable for automotive battery standby supplies, portable medical sensor nodes, industrial IoT edge controllers, and smart meter auxiliary rails requiring stable component supply across extended temperature and long-life deployments.
Supply support for LT1934ES6-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1934 family was designed specifically for micropower, wide-input-voltage DC/DC conversion in space- and energy-constrained applications such as battery-powered instrumentation and automotive subsystems.
FAQ
What is the maximum output current supported by the LT1934ES6-1#TRMPBF?
The LT1934ES6-1#TRMPBF supports up to 60mA of continuous output current, limited by its internal 75mA current-limit threshold and optimized for low-power applications. This value assumes proper inductor selection (e.g., 100μH for 3.3V output) and thermal management within the TSOT-23 package's 250°C/W θJA. Exceeding 60mA risks current-limit activation and reduced regulation accuracy.
Does the LT1934ES6-1#TRMPBF require an external catch diode?
Yes, the LT1934ES6-1#TRMPBF requires an external Schottky catch diode (e.g., ON Semiconductor MBR0540) connected between SW and VOUT. The diode provides a path for inductor current during switch-off periods and prevents reverse current flow. Its 40V reverse rating and 0.4V forward drop are critical for maintaining efficiency and stability across the 3.2V–34V input range.
How does Burst Mode® operation improve light-load efficiency in the LT1934ES6-1#TRMPBF?
Burst Mode® operation in the LT1934ES6-1#TRMPBF improves light-load efficiency by disabling the switching action entirely when output voltage remains within hysteresis band (±5mV around 1.25V FB setpoint), reducing quiescent current to just 12μA. Switching resumes only when load discharge causes FB voltage to fall below threshold, delivering discrete energy packets instead of continuous PWM-ideal for intermittent sensor sampling.
Can the LT1934ES6-1#TRMPBF be used with a 3.3V input supply?
No, the LT1934ES6-1#TRMPBF cannot operate reliably from a 3.3V input because its absolute minimum input voltage is 3.2V and undervoltage lockout engages near 3.0V. At 3.3V input, margin is insufficient to sustain regulation under load or temperature variation. For 3.3V input applications, consider a dedicated LDO or a buck regulator with lower VIN(MIN), such as the TPS62240.
What is the purpose of the BOOST pin on the LT1934ES6-1#TRMPBF?
The BOOST pin on the LT1934ES6-1#TRMPBF supplies gate/base drive voltage to the internal bipolar NPN switch, enabling full saturation and minimizing VCE(SAT). It must be held ≥2.5V above the SW pin using an external diode-capacitor charge pump (e.g., BAT54 + 0.1μF). Without proper BOOST voltage, the switch operates in linear region, causing excessive heat and potential failure at rated load.
LT1934ES6-1#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT1934ES6-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1934ES6-1#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 LT1934ES6-1#TRMPBF reliable?
The price and inventory of LT1934ES6-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1934ES6-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1934ES6-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1934ES6-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1934ES6-1#TRMPBF?
LT1934ES6-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1934ES6-1#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 LT1934ES6-1#TRMPBF?
For technical support, including LT1934ES6-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1934ES6-1#TRMPBF requirements.
6.How does Aetrix verify that LT1934ES6-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1934ES6-1#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 LT1934ES6-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1934ES6-1#TRMPBF?
All LT1934ES6-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1934ES6-1#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 LT1934ES6-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT1934ES6-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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