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Analog Devices Inc. LT1933HS6#TRPBF
- Part No.:
- LT1933HS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1933HS6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,285
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Product details
Overview
LT1933HS6#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz, current-mode PWM step-down DC/DC converter with integrated 0.75A bipolar NPN power switch, housed in a thermally enhanced 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 soft-start, cycle-by-cycle current limiting, and <2μA shutdown current - ideal for automotive battery regulation and industrial control supplies.
For engineers reviewing the LT1933HS6#TRPBF datasheet, LT1933HS6#TRPBF pinout, LT1933HS6#TRPBF application, or LT1933HS6#TRPBF equivalent, key selection considerations include its –40°C to 150°C operating temperature range, fixed 500kHz switching frequency, internal compensation, 1.245V feedback reference, and BOOST-pin-driven high-side switch architecture requiring external diode/capacitor for gate drive.
Technical Context
The LT1933HS6#TRPBF implements constant-frequency current-mode control using an internal RS flip-flop oscillator and slope-compensated current sensing. Its VC node serves as the error amplifier output and current limit clamp point, directly servoing the internal power switch duty cycle based on FB pin voltage deviation from 1.245V.
Operation relies on external BOOST circuitry (diode + capacitor) to generate ~2.3V above SW pin voltage, enabling full saturation of the internal bipolar NPN switch. Frequency foldback activates below ~55kHz when FB voltage drops, improving overload and startup behavior without external components.
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 including cold-crank transients. |
| Switching Frequency | 500kHz (typical), 400–600kHz (min–max) - enables use of small 22–33μH inductors and ceramic output capacitors for compact, low-ripple designs. |
| Output Current | 600mA continuous - verified at 3.3V from 12–36V input and 5V from 16–36V input per datasheet test conditions. |
| Feedback Reference | 1.245V ±20mV - sets output voltage via resistor divider (VOUT = 1.245V × (1 + R1/R2)); enables adjustable outputs down to 1.25V. |
| Shutdown Current | <2μA - ensures true output disconnect and ultra-low quiescent drain in battery-powered systems during sleep mode. |
| Operating Temperature | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments (H-grade). |
| Max Duty Cycle | 94% - supports high step-down ratios (e.g., 36V→3.3V) while maintaining stable regulation near minimum input voltage. |
Pinout & Package
LT1933HS6#TRPBF uses the 6-lead Plastic TSOT-23 (S6) package - 3.0mm × 1.7mm × 1.0mm profile with exposed pad not present (unlike DFN variants). Thermal resistance θJA = 165°C/W; θJC = 102°C/W. Requires standard SMT reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap drive supply | Accepts externally generated voltage ≥2.3V above SW to fully saturate internal NPN switch; must stay ≤43V absolute max. |
| GND (Pin 2) | Power and signal ground | Reference for FB divider, SHDN logic, and internal regulator; must connect to low-impedance local ground plane. |
| FB (Pin 3) | Feedback input | Regulated to 1.245V; connects to resistor divider tap - determines output voltage and closes control loop. |
| SHDN (Pin 4) | Enable/soft-start control | Logic-high (≥2.3V) enables operation; grounded disables converter; RC ramp here provides controlled start-up current limiting. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch driver; requires local 2.2μF X7R/X5R ceramic bypass within 3mm. |
| SW (Pin 6) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed high-current switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - simplifies design and reduces BOM count for standard ceramic-capacitor-based outputs. |
| Cycle-by-cycle current limit | Protects against shorted outputs by limiting peak switch current to 0.75A (min), preventing thermal runaway without external sensing. |
| Soft-start via SHDN pin | Enables controlled output voltage ramp using external RC; prevents input surge and output overshoot during power-up. |
| Undervoltage lockout (UVLO) | Disables switching below ~3.35V VIN - avoids erratic operation and ensures clean startup from weak or recovering sources. |
| Low-profile TSOT-23 package | 1.0mm height, 3.0mm × 1.7mm footprint - enables space-constrained PCB layouts in portable and automotive modules. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rail to 3.3V or 5V for microcontrollers, sensors, and CAN transceivers in engine control units or body electronics. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, efficient, and thermally robust DC/DC conversion with fault protection. Use Value: Withstands –40°C to +150°C ambient and load dump transients up to 36V; <2μA shutdown extends battery life during vehicle sleep modes. |
Use Scenario: Powering PLC I/O modules, fieldbus interfaces, and analog sensor front-ends from 24V industrial power rails. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator delivering stable 3.3V/5V with minimal external components. Use Value: Fixed 500kHz operation allows predictable EMI filtering; internal compensation eliminates tuning effort for standard ceramic output caps. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter outputs to clean 3.3V for embedded networking devices or IoT gateways. IC Role / Device Role / Timing Role: Input-flexible buck converter handling wide input variation while maintaining tight output regulation. Use Value: 3.6V–36V input range accommodates brownout and overvoltage conditions common with low-cost adapters; soft-start prevents inrush tripping. |
Use Scenario: Supplying 3.3V to portable medical monitors, handheld test equipment, or wireless sensors powered by Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent buck regulator extending runtime and enabling deep-sleep modes. Use Value: <2μA shutdown current minimizes battery drain; 500kHz switching allows tiny passive components to reduce overall solution size and weight. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz synchronous buck, 600mA, 2.5–5.5V input, integrated MOSFETs, 12-lead DFN | Optimized for low-input, high-frequency, low-ESR ceramic-cap applications - not suitable for 36V inputs or automotive temp range | Select when input is ≤5.5V and board space demands ultra-small inductors; avoid for 24V+ or extended temperature use. |
| TPS54302DDCR | 3.5V–28V input, 3A synchronous buck, 600kHz, 6-lead SOT-23, –40°C to 125°C | Higher current, synchronous rectification, lower RDS(on), but only rated to 125°C junction and lacks BOOST architecture for bipolar switch drive | Choose for higher output current and efficiency at 12V input; verify thermal margin at 150°C ambient - LT1933HS6#TRPBF remains preferred for H-grade automotive. |
Compared with LTC3605EDE#TRPBF and TPS54302DDCR, the LT1933HS6#TRPBF uniquely combines 36V input capability, –40°C to +150°C operation, and bipolar switch architecture with BOOST drive - making it irreplaceable for high-voltage, high-temperature industrial and automotive buck applications where synchronous FETs or low-VIN architectures fall short.
Availability
LT1933HS6#TRPBF 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 and long product lifecycles.
Supply support for LT1933HS6#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 and manufacturing continuity for legacy Linear power products including the LT1933 family.
The LT1933 product line was designed specifically for rugged, wide-input-voltage DC/DC conversion in harsh environments - emphasizing thermal robustness, fault tolerance, and minimal external component count for automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum input voltage rating for the LT1933HS6#TRPBF?
The LT1933HS6#TRPBF has an absolute maximum input voltage (VIN) rating of 36V. Exceeding this voltage risks permanent damage. The device is specified to operate continuously from 3.6V to 36V, making it suitable for 24V industrial systems and automotive applications with load dump protection. Transient spikes beyond 36V require external clamping.
Does the LT1933HS6#TRPBF require an external catch diode?
Yes, the LT1933HS6#TRPBF requires an external Schottky catch diode (e.g., MBRM140 or MBR0540) connected between SW and GND. Unlike synchronous buck converters, it uses an internal bipolar NPN switch and relies on this diode for inductor current path during switch-off periods. Diode reverse voltage rating must exceed the maximum input voltage.
What is the purpose of the BOOST pin on the LT1933HS6#TRPBF?
The BOOST pin on the LT1933HS6#TRPBF provides gate drive voltage higher than VIN to fully saturate the internal bipolar NPN power switch. It requires an external diode and capacitor (e.g., 1N4148 + 0.1μF) connected between VIN and BOOST. The BOOST voltage must be ≥2.3V above the SW pin voltage for optimal efficiency and switch conduction.
Can the LT1933HS6#TRPBF be used to generate an adjustable output voltage?
Yes, the LT1933HS6#TRPBF supports adjustable output voltages down to 1.25V using a resistor divider from VOUT to FB. The internal reference is 1.245V, so VOUT = 1.245V × (1 + R1/R2). R2 should be ≤20kΩ to minimize bias current error. This enables precise 3.3V, 5V, or custom rail generation without external regulators.
How does the LT1933HS6#TRPBF handle thermal stress in high-ambient environments?
The LT1933HS6#TRPBF is rated for operation from –40°C to +150°C (H-grade) and features thermal shutdown protection. Its TSOT-23 package has θJA = 165°C/W; effective thermal performance depends on PCB copper area, airflow, and adjacent heat sources. For sustained 600mA loads above 100°C ambient, derating or additional copper pour is recommended to maintain reliability.
LT1933HS6#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):
- 3.6V
- 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 ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1933HS6#TRPBF FAQ
1.How can I place an order for LT1933HS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933HS6#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 LT1933HS6#TRPBF reliable?
The price and inventory of LT1933HS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933HS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1933HS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933HS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933HS6#TRPBF?
LT1933HS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933HS6#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 LT1933HS6#TRPBF?
For technical support, including LT1933HS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933HS6#TRPBF requirements.
6.How does Aetrix verify that LT1933HS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1933HS6#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 LT1933HS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1933HS6#TRPBF?
All LT1933HS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933HS6#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 LT1933HS6#TRPBF part is unused and in its original packaging.
Return procedure for LT1933HS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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