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Analog Devices Inc. LT1933HS6#TRMPBF
- Part No.:
- LT1933HS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1933HS6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:991
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Product details
Overview
LT1933HS6#TRMPBF 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 6-lead TSOT-23 package. It operates from 3.6V to 36V input, delivers up to 600mA output, regulates fixed or adjustable outputs down to 1.25V, and features soft-start, cycle-by-cycle current limiting, and <2μA shutdown current-enabling compact, efficient power supplies for automotive battery regulation and industrial control.
For engineers reviewing the LT1933HS6#TRMPBF datasheet, LT1933HS6#TRMPBF pinout, LT1933HS6#TRMPBF application, or LT1933HS6#TRMPBF equivalent, key selection criteria include its –40°C to 150°C operating temperature range, 500kHz fixed switching frequency, internal compensation, BOOST pin voltage requirements, and SOT-23 thermal characteristics (θJA = 165°C/W).
Technical Context
The LT1933HS6#TRMPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and RS flip-flop to drive its bipolar NPN switch. Its error amplifier servo-controls the VC node to maintain 1.245V at FB, while slope compensation mitigates subharmonic oscillation at high duty cycles.
Operation relies on external BOOST circuitry (diode + capacitor) to generate >VIN gate drive for the internal switch; minimum BOOST-to-SW voltage is 1.9V. Frequency foldback activates when FB voltage drops below 1.1V, reducing switching frequency to 55kHz during overload or startup to limit peak current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports unregulated wall transformers, 24V industrial rails, and automotive batteries with transient tolerance up to 36V. |
| Switch Current Limit | 0.75A typical - provides cycle-by-cycle overcurrent protection; derates with duty cycle due to slope compensation. |
| 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 power in battery-powered systems. |
| Switching Frequency | 500kHz (typ), 400–600kHz (min–max) - enables use of small 22μH inductors and ceramic capacitors for minimal board area. |
| Operating Temperature | –40°C to +150°C - qualified for under-hood automotive and high-temperature industrial environments. |
| Package Thermal Resistance | θJA = 165°C/W - requires careful PCB copper pour and thermal vias beneath exposed pad (not applicable to SOT-23 variant). |
Pinout & Package
LT1933HS6#TRMPBF uses the 6-lead Plastic TSOT-23 (S6) package, 1.0mm profile, with pins arranged as shown below. The exposed pad is absent in TSOT-23; thermal performance relies on PCB trace width and copper area connected to GND pins.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Bootstrap drive supply | Must be ≥1.9V above SW pin; powered externally via diode + capacitor to enable full saturation of internal bipolar switch. |
| 2 (GND) | Power and signal ground reference | Return path for internal regulator, feedback divider, and switch emitter; must connect to low-impedance local ground plane. |
| 3 (FB) | Output voltage sense input | Regulated to 1.245V; connects to resistor divider tap; bias current ≤120nA minimizes divider error. |
| 4 (SHDN) | Enable/shutdown and soft-start control | Logic-high ≥2.3V enables operation; logic-low ≤0.3V disables switch and reduces IQ to <2μA; RC ramp enables controlled start-up. |
| 5 (VIN) | Main power input | Supplies internal regulator and switch collector; requires local 2.2μF ceramic bypass close to pin. |
| 6 (SW) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed current up to 0.75A with ~370mV VCE(sat) at 400mA. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation components; stable with ceramic output capacitors (no ESR dependency). |
| Fixed 500kHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing; foldback to 55kHz during fault conditions improves robustness. |
| Soft-start via SHDN pin | External RC network ramps SHDN voltage to limit inrush current; prevents input surge and output overshoot during power-up. |
| Wide input range with UVLO | Undervoltage lockout triggers at ~3.35V; prevents erratic operation during brownout or cold-cranking in automotive systems. |
| Low shutdown current | <2μA enables true load disconnect-critical for long battery life in portable and remote-sensor applications. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for microcontrollers, CAN transceivers, and sensors in engine control units. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled DC power with thermal resilience up to 150°C junction temperature. Use Value: Survives automotive load-dump transients and cold-crank undervoltage; eliminates need for external current-sense resistor or compensation network. |
Use Scenario: Powering PLC I/O modules, fieldbus interfaces, and analog front-ends from 24V industrial rails with strict efficiency and size constraints. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator delivering stable 3.3V/5V at 600mA without heatsinking. Use Value: Enables fully integrated power stage in space-constrained DIN-rail enclosures; 500kHz operation reduces filter component volume by >40% vs. 100kHz alternatives. |
| 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 and IoT gateways. IC Role / Device Role / Timing Role: Input-tolerant buck controller maintaining regulation across wide line variations and light-load efficiency demands. Use Value: Eliminates need for pre-regulator LDO; achieves >85% efficiency at 100mA load with ceramic input/output caps. |
Use Scenario: Supplying 3.3V to ARM Cortex-M microcontrollers and BLE radios in handheld test instruments with multi-year battery life requirements. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling deep-sleep modes with <2μA shutdown current and fast wake-up response. Use Value: Extends coin-cell or Li-ion runtime by minimizing quiescent loss; soft-start prevents brownout during wake-up transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3975EMSE#PBF | Higher 4A switch current, 2MHz switching, requires external compensation; wider VIN (4.2V–60V); larger 16-MSOP package. | Targets higher-power industrial and LED driver applications where 600mA is insufficient. | Select when >1A output or 2MHz operation is required; not drop-in due to different pinout and compensation needs. |
| TPS54302DDCR | 3A FET, 2.5V–6V VIN, 500kHz, integrated bootstrap FET; smaller 6-SOIC package; no BOOST pin requirement. | Suitable only for low-input-voltage applications (e.g., USB-powered systems); lacks 36V input capability. | Choose for cost-sensitive, low-VIN designs where LT1933HS6#TRMPBF's 3.6–36V range is unnecessary. |
Compared with LT3975EMSE#PBF and TPS54302DDCR, the LT1933HS6#TRMPBF uniquely balances ultra-wide input range, high-temperature rating, and minimal external component count in a sub-2mm footprint-making it optimal for space- and thermal-constrained 3.6–36V buck applications requiring ≤600mA.
Availability
LT1933HS6#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 LT1933HS6#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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LT1933 product line was designed specifically for rugged, wide-input-voltage step-down conversion in harsh environments-targeting automotive, industrial, and telecom infrastructure applications where reliability across –40°C to +150°C is mandatory.
FAQ
What is the maximum output current capability of the LT1933HS6#TRMPBF?
The LT1933HS6#TRMPBF delivers up to 600mA continuous output current under typical conditions (e.g., 12V input to 3.3V output with 22μH inductor). Its internal 0.75A bipolar switch current limit and thermal design support this rating at full junction temperature (150°C), though actual achievable current depends on layout, ambient temperature, and input/output voltage differential.
Does the LT1933HS6#TRMPBF require an external BOOST capacitor and diode?
Yes, the LT1933HS6#TRMPBF requires an external BOOST capacitor (typically 0.1μF) and fast-switching diode (e.g., 1N4148) connected between VIN and BOOST pins. This network generates a voltage ≥1.9V above the SW pin to fully saturate the internal bipolar NPN switch-omitting it causes excessive conduction loss and thermal failure.
Can the LT1933HS6#TRMPBF operate with a 3.3V input supply?
No-the LT1933HS6#TRMPBF has an undervoltage lockout threshold of ~3.35V and minimum operating input of 3.6V. Attempting to operate below 3.6V will prevent startup or cause erratic regulation; for 3.3V-input applications, consider alternatives like the TPS54302DDCR or LTC3605.
What is the purpose of the SHDN pin on the LT1933HS6#TRMPBF beyond enable/disable control?
Beyond enabling/disabling the LT1933HS6#TRMPBF, the SHDN pin implements soft-start: applying a slow-rising voltage (via external RC network) to SHDN ramps the internal control loop, limiting inrush current and preventing output overshoot during power-up-critical for protecting downstream logic and minimizing input capacitor stress.
How does the LT1933HS6#TRMPBF handle short-circuit conditions on its output?
The LT1933HS6#TRMPBF employs cycle-by-cycle current limiting to protect against shorted outputs: each switching cycle terminates when sensed switch current reaches the 0.75A limit. During sustained short, it enters hiccup mode (frequency foldback to 55kHz) to reduce power dissipation and prevent thermal damage-allowing safe recovery once fault clears.
LT1933HS6#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 ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1933HS6#TRMPBF FAQ
1.How can I place an order for LT1933HS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933HS6#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 LT1933HS6#TRMPBF reliable?
The price and inventory of LT1933HS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933HS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1933HS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933HS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933HS6#TRMPBF?
LT1933HS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933HS6#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 LT1933HS6#TRMPBF?
For technical support, including LT1933HS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933HS6#TRMPBF requirements.
6.How does Aetrix verify that LT1933HS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1933HS6#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 LT1933HS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1933HS6#TRMPBF?
All LT1933HS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933HS6#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 LT1933HS6#TRMPBF part is unused and in its original packaging.
Return procedure for LT1933HS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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