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Analog Devices Inc. LT1933IS6#TRMPBF
- Part No.:
- LT1933IS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1933IS6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,315
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Product details
Overview
LT1933IS6#TRMPBF from Analog Devices (formerly Linear Technology) is a 500kHz, current-mode PWM step-down DC/DC converter with an integrated 0.75A bipolar NPN power switch, housed in a 6-lead TSOT-23 package. It operates from 3.6V to 36V input, delivers up to 600mA at 3.3V or 5V output, and features internal compensation, soft-start, and <2μA shutdown current-enabling compact, efficient power regulation in automotive battery systems and industrial control supplies.
For engineers reviewing the LT1933IS6#TRMPBF datasheet, LT1933IS6#TRMPBF pinout, LT1933IS6#TRMPBF application, or LT1933IS6#TRMPBF equivalent, key selection considerations include its 500kHz fixed-frequency operation, 1.245V feedback reference, 88% maximum duty cycle, –40°C to 125°C operating range, and compatibility with ceramic output capacitors for low-ripple, space-constrained designs.
Technical Context
The LT1933IS6#TRMPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and slope-compensated current sensing. Its error amplifier regulates the VC node to maintain 1.245V at FB, directly controlling switch conduction time via the internal bipolar NPN transistor.
Startup and protection are managed through undervoltage lockout (~3.35V), cycle-by-cycle current limiting (0.75A typ), and SHDN-driven soft-start. The BOOST pin enables high-side drive voltage generation via external diode/capacitor, ensuring full saturation of the internal switch across the full input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports unregulated wall adapters, 24V industrial rails, and automotive batteries without external pre-regulation. |
| Switching Frequency | 500kHz (typ) - enables use of small 22μH inductors and 2.2μF ceramic input capacitors for minimal board area. |
| Output Current | 600mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference | 1.245V (±20mV) - sets precise output voltage via external resistor divider; enables adjustable outputs down to 1.25V. |
| Shutdown Current | <2μA - provides true output disconnect for ultra-low-power battery operation and system-level power sequencing. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments without derating. |
| Max Duty Cycle | 88% - determines minimum input voltage for regulation (e.g., ≥4.5V for 3.3V output). |
Pinout & Package
LT1933IS6#TRMPBF is packaged in a 6-lead TSOT-23 (ThinSOT™) surface-mount package, 2.9mm × 1.6mm × 1.0mm profile, with exposed pad not present (unlike DFN variants). Pin 1 is BOOST; pin 2 is GND; pin 3 is FB; pin 4 is SHDN; pin 5 is VIN; pin 6 is SW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge pump driver supply | Accepts externally generated voltage ≥2.3V above SW to fully saturate internal bipolar NPN switch; requires 0.1μF capacitor and fast diode (e.g., 1N4148). |
| GND (Pin 2) | Power and signal reference | Primary ground return for internal regulator, error amp, and feedback network; must connect to low-impedance local ground plane. |
| FB (Pin 3) | Output voltage sense input | Regulated to 1.245V; connects to resistor divider tap; sets VOUT = 1.245V × (1 + R1/R2); bias current ≤120nA minimizes divider error. |
| SHDN (Pin 4) | Enable and soft-start control | Logic-high (≥2.3V) enables operation; grounded disables converter and reduces quiescent current to <2μA; RC ramp enables controlled start-up. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch driver; requires local 2.2μF X7R/X5R ceramic bypass placed adjacent to pin. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed current up to 0.75A; layout critical for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation components; stable with ceramic output capacitors (no ESR dependency). |
| Soft-start via SHDN pin | Prevents input current surge during startup by ramping internal VC node; implemented with external R-C network on SHDN. |
| Cycle-by-cycle current limit | Protects against shorted outputs and inductor saturation; limits peak switch current to 0.75A (typ), with slope compensation at high duty cycles. |
| Low-profile TSOT-23 package | 6-lead, 2.9mm × 1.6mm footprint with 1.0mm height - enables high-density PCB layouts in space-constrained applications like portable instrumentation. |
| Wide input range with UVLO | Operates from 3.6V to 36V; built-in undervoltage lockout (~3.35V) prevents erratic switching during brownout or cold-cranking conditions. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for infotainment MCU, CAN transceiver, or sensor hub. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power domain with thermal robustness for under-hood placement. Use Value: Withstands load dump transients up to 36V input and operates reliably from –40°C to 125°C ambient without external thermal management. |
Use Scenario: Powering PLC I/O modules, fieldbus interface ICs, or analog front-ends from 24V industrial rail. IC Role / Device Role / Timing Role: Compact, self-contained DC/DC stage delivering regulated 5V/600mA with minimal external components and no heatsink. Use Value: 500kHz switching allows use of 22μH inductor and 22μF ceramic output capacitor - reducing solution size by >40% vs. lower-frequency alternatives. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to stable 3.3V for IoT gateway or smart meter processor. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator eliminating need for upstream linear regulator or wide-input LDO. Use Value: 3.6V–36V input range accepts wide variation in transformer output; <2μA shutdown current extends standby battery life in always-on devices. |
Use Scenario: Powering handheld test equipment or portable medical sensors from single Li-ion or dual alkaline cells. IC Role / Device Role / Timing Role: Efficient buck converter enabling >85% efficiency at 500mA load while maintaining low quiescent current in sleep mode. Use Value: Soft-start prevents inrush into large output caps; internal compensation simplifies design for battery-operated products with rapid time-to-market requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | 42V input, 2A switch, synchronous rectification, programmable charge termination - designed for battery charging, not general-purpose buck conversion. | Intended for Li-ion/Pb-acid charging with battery-sense inputs; lacks adjustable FB reference and soft-start flexibility of LT1933IS6#TRMPBF. | Select only if battery charging functionality is required; not drop-in for standard buck applications due to different pinout and control architecture. |
| TPS54302DDCR | 2.5–18V input, 3A switch, 500kHz sync buck, 1.221V reference, 1.5μA shutdown - TI part with tighter ref tolerance but narrower input range. | Requires minimum 2.5V input; unsuitable for 24V industrial or automotive battery direct connection without pre-regulation. | Consider when input is limited to ≤18V and higher output current (>600mA) is needed; verify thermal performance in TSOT-23 footprint at full load. |
Compared with LT3652IMSE#TRPBF and TPS54302DDCR, the LT1933IS6#TRMPBF offers broader input voltage support (3.6–36V), proven bipolar switch ruggedness for high-VIN transient immunity, and simpler external component count for basic fixed-output regulation - making it optimal for cost-sensitive, thermally demanding, non-battery-charging applications.
Availability
LT1933IS6#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and wall transformer regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1933IS6#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 legacy Linear power products.
The LT1933 product line was designed for high-input-voltage, space-constrained DC/DC conversion in automotive, industrial, and instrumentation applications where reliability across wide temperature ranges and minimal external component count are critical.
FAQ
What is the maximum output current capability of the LT1933IS6#TRMPBF?
The LT1933IS6#TRMPBF delivers up to 600mA continuously at 3.3V or 5V output when configured per typical application circuits (e.g., 22μH inductor, MBRM140 catch diode). Peak switch current is internally limited to 0.75A (typ), and actual output current depends on input voltage, thermal environment, and inductor saturation rating. At 12V input and 3.3V output, full 600mA is achievable with proper PCB layout and airflow.
Does the LT1933IS6#TRMPBF require external compensation components?
No, the LT1933IS6#TRMPBF is internally compensated and does not require external compensation components. Its current-mode architecture eliminates dependence on output capacitor ESR for stability, allowing direct use of low-ESR ceramic capacitors. This simplifies design, reduces bill-of-materials, and improves transient response without tuning.
What is the function of the BOOST pin on the LT1933IS6#TRMPBF?
The BOOST pin on the LT1933IS6#TRMPBF supplies gate drive voltage to the internal bipolar NPN power switch. It must be held ≥2.3V above the SW pin voltage using an external diode and capacitor (e.g., 1N4148 + 0.1μF). This ensures full saturation of the switch across the entire 3.6–36V input range, maximizing efficiency and minimizing VCE(SAT).
Can the LT1933IS6#TRMPBF operate from a 5V input to generate 3.3V output?
Yes, the LT1933IS6#TRMPBF can regulate 3.3V from a 5V input, but only under specific conditions: the minimum input voltage for reliable operation is ~4.5V (due to 88% max duty cycle and diode/switch drops). At 5V input, 3.3V output is viable with light-to-moderate loads (<500mA) and proper inductor selection (e.g., 15–22μH); efficiency remains >85% per typical performance curves.
What is the shutdown current specification for the LT1933IS6#TRMPBF?
The LT1933IS6#TRMPBF specifies shutdown current of <2μA (max) when the SHDN pin is pulled to ground. This ultra-low quiescent state fully disconnects the output and disables internal circuitry, making it ideal for battery-powered systems requiring multi-year shelf life or extended sleep modes without significant drain.
LT1933IS6#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):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 33.84V
- Current - Output:
- 600mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1933IS6#TRMPBF FAQ
1.How can I place an order for LT1933IS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933IS6#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 LT1933IS6#TRMPBF reliable?
The price and inventory of LT1933IS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933IS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1933IS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933IS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933IS6#TRMPBF?
LT1933IS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933IS6#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 LT1933IS6#TRMPBF?
For technical support, including LT1933IS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933IS6#TRMPBF requirements.
6.How does Aetrix verify that LT1933IS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1933IS6#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 LT1933IS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1933IS6#TRMPBF?
All LT1933IS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933IS6#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 LT1933IS6#TRMPBF part is unused and in its original packaging.
Return procedure for LT1933IS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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