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Analog Devices Inc. LT1933IS6#TRPBF
- Part No.:
- LT1933IS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1933IS6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,745
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Product details
Overview
LT1933IS6#TRPBF from Analog Devices (formerly Linear Technology) is a 600mA, 500kHz current-mode PWM step-down DC/DC converter with internal 0.75A bipolar NPN power switch, housed in a 6-lead TSOT-23 package. It operates from 3.6V to 36V input, regulates fixed or adjustable outputs down to 1.25V, and delivers up to 600mA at 3.3V from 12–36V input-ideal for automotive battery regulation and industrial control supplies.
For engineers reviewing the LT1933IS6#TRPBF datasheet, LT1933IS6#TRPBF pinout, LT1933IS6#TRPBF application, or LT1933IS6#TRPBF equivalent, key selection criteria include its –40°C to 125°C operating temperature range, <2μA shutdown current, internally compensated architecture, 500kHz fixed switching frequency, and compatibility with ceramic output capacitors for low-ripple, space-constrained designs.
Technical Context
The LT1933IS6#TRPBF implements constant-frequency current-mode control with cycle-by-cycle current limiting and frequency foldback during overload. Its internal bipolar NPN switch requires BOOST pin voltage ≥2.3V above SW for saturation, enabled by external diode-capacitor charge pump.
Soft-start is implemented via SHDN pin voltage ramping; undervoltage lockout (~3.35V) prevents operation below minimum input threshold. The error amplifier servo-controls the VC node to maintain 1.245V on FB, enabling output adjustment via resistor divider while eliminating need for output capacitor ESR in loop compensation.
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 with transient tolerance up to 36V. |
| Switching Frequency | 500kHz (typical) - enables use of small 22μH inductors and 2.2μF ceramic input capacitors for compact, low-EMI layouts. |
| Output Current | 600mA continuous - sustained at 3.3V output from 12–36V input; limited by thermal performance in SOT-23 package (θJA = 165°C/W). |
| Feedback Reference | 1.245V (±20mV) - sets output voltage via external resistor divider; allows adjustable outputs down to 1.25V with high accuracy. |
| Shutdown Current | <2μA - provides true output disconnect for battery-powered systems requiring ultra-low quiescent power. |
| Operating Temperature | –40°C to 125°C - qualified for extended industrial and automotive under-hood applications. |
| Current Limit | 0.75A (min) - protects against shorted outputs and startup surges; slope-compensated for stability across duty cycles. |
Pinout & Package
LT1933IS6#TRPBF uses the 6-lead Plastic TSOT-23 (S6) package, 1mm 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 drive node | Supplies boosted gate drive voltage ≥2.3V above SW to fully saturate internal bipolar NPN switch; requires external 0.1μF capacitor + fast diode (e.g., 1N4148). |
| GND (Pin 2) | Power and signal reference | Primary ground return for internal regulator, feedback divider, and control circuitry; must connect to local ground plane. |
| FB (Pin 3) | Voltage sense input | Regulated to 1.245V; sets output via R1/R2 divider; bias current ≤120nA minimizes divider error. |
| SHDN (Pin 4) | Enable/soft-start control | Logic-high (≥2.3V) enables operation; grounded disables output and reduces IQ to <2μA; RC ramp enables controlled soft-start. |
| 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 | Connects to inductor, catch diode cathode, and BOOST capacitor anode; carries pulsed current up to 0.75A with ~370mV VCE(sat) at 400mA. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates external compensation components; stable with ceramic output capacitors (no ESR dependency), reducing BOM count and board area. |
| Cycle-by-cycle current limit | Prevents damage during output shorts or overloads without external sensing; integrates seamlessly with current-mode control loop. |
| Soft-start via SHDN pin | Enables controlled inrush current management using external RC network-critical for systems with large input capacitance or weak supplies. |
| Low-profile TSOT-23 package | 6-lead, 1mm height package enables ultra-compact point-of-load regulation in space-constrained industrial and automotive PCBs. |
| Wide input range (3.6V–36V) | Supports direct connection to 12V/24V vehicle batteries and industrial supplies without pre-regulation, simplifying power architecture. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery 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, ripple-controlled DC supply with thermal robustness across –40°C to 125°C ambient. Use Value: Delivers 600mA at 3.3V from 12–36V input with <2μA shutdown current, enabling always-on monitoring circuits without battery drain. | Use Scenario: Powering PLC I/O modules, fieldbus interface ICs, and analog front-ends from 24V industrial rails subject to brownouts and transients. IC Role / Device Role / Timing Role: Fixed-frequency step-down regulator delivering stable 5V/3.3V with undervoltage lockout (3.35V) preventing erratic behavior during rail sag. Use Value: Operates reliably across full –40°C to 125°C range and withstands 36V transients, reducing need for upstream TVS or LDO pre-regulation. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to clean 3.3V for embedded Wi-Fi modules, displays, and USB peripherals. IC Role / Device Role / Timing Role: High-efficiency (up to 95%) buck converter minimizing heat buildup in enclosed plastic enclosures with no heatsink required. Use Value: 500kHz switching enables tiny 22μH inductors and 2.2μF ceramic input caps-reducing solution size by >40% vs. lower-frequency alternatives. | Use Scenario: Powering portable test equipment, handheld meters, and IoT edge nodes from single-cell Li-ion or multi-cell alkaline packs. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting 1.25V–5V range, optimized for light-load efficiency and rapid wake-up from ultra-low-power shutdown. Use Value: <2μA shutdown current extends battery life in sleep mode; soft-start prevents voltage droop 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 |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz synchronous buck, 600mA, 2.5–5.5V input, integrated MOSFETs, 16-pin DFN | Requires lower input voltage; suited for post-regulation from 3.3V/5V rails-not direct replacement for 3.6–36V primary conversion | Select when higher efficiency, smaller inductors, and synchronous rectification are prioritized over wide-input capability. |
| TPS54302DDAR | 3A synchronous buck, 3.5–28V input, 500kHz, SO-8 package, integrated FETs, 1.221V reference | Higher current rating and SO-8 thermal performance; different pinout and layout requirements; lacks BOOST pin architecture | Choose for higher load demands (>600mA) or where SO-8 footprint and thermal relief are preferred over SOT-23 size constraints. |
Compared with LTC3605EDE#TRPBF and TPS54302DDAR, the LT1933IS6#TRPBF uniquely supports 3.6–36V input in a 6-lead TSOT-23 package with bipolar switch and BOOST-driven architecture-making it optimal for cost-sensitive, wide-input, space-constrained primary regulation where synchronous efficiency is secondary to simplicity and ruggedness.
Availability
LT1933IS6#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 ranges and long production lifecycles.
Supply support for LT1933IS6#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 its legacy of high-performance analog and power management ICs with rigorous qualification standards.
The LT1933 product line delivers rugged, wide-input buck regulators for harsh environments-designed specifically for automotive, industrial, and distributed power applications where reliability across temperature extremes and input transients is critical.
FAQ
What is the maximum output current capability of the LT1933IS6#TRPBF?
The LT1933IS6#TRPBF delivers up to 600mA continuous output current at 3.3V from a 12–36V input, and 500mA at 3.3V from 4.5–36V input. Actual achievable current depends on ambient temperature, PCB copper area, and input/output voltage differential-thermal limits in the TSOT-23 package constrain sustained operation above 600mA without significant derating.
Does the LT1933IS6#TRPBF require an external catch diode?
Yes, the LT1933IS6#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 external diode for inductor current path during switch-off periods-omitting it will cause failure.
Can the LT1933IS6#TRPBF operate from a 5V input?
Yes, the LT1933IS6#TRPBF can operate from a 5V input when configured for 3.3V output (minimum input per datasheet is ~4.5V for 3.3V output). However, at low VIN–VOUT differentials, BOOST pin voltage margin shrinks-use Figure 2b configuration (BOOST tied to VIN) and verify VBOOST–VSW ≥2.3V under load to ensure switch saturation.
What is the purpose of the BOOST pin on the LT1933IS6#TRPBF?
The BOOST pin on the LT1933IS6#TRPBF supplies elevated gate drive voltage to the internal bipolar NPN power switch, ensuring full saturation and low conduction loss. It must be ≥2.3V above the SW pin voltage-achieved via external diode-capacitor charge pump-and is critical for efficiency across the full 3.6–36V input range.
Is the LT1933IS6#TRPBF pin-compatible with other LT1933 variants like LT1933ES6#TRPBF?
Yes, the LT1933IS6#TRPBF shares identical pinout, package dimensions, and electrical interface with all S6-package LT1933 variants (e.g., LT1933ES6#TRPBF, LT1933HS6#TRPBF); only the guaranteed operating temperature range differs-LT1933IS6#TRPBF is rated for –40°C to 125°C, while LT1933ES6#TRPBF is rated for –40°C to 85°C.
LT1933IS6#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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1933IS6#TRPBF FAQ
1.How can I place an order for LT1933IS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933IS6#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 LT1933IS6#TRPBF reliable?
The price and inventory of LT1933IS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933IS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1933IS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933IS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933IS6#TRPBF?
LT1933IS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933IS6#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 LT1933IS6#TRPBF?
For technical support, including LT1933IS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933IS6#TRPBF requirements.
6.How does Aetrix verify that LT1933IS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1933IS6#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 LT1933IS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1933IS6#TRPBF?
All LT1933IS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933IS6#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 LT1933IS6#TRPBF part is unused and in its original packaging.
Return procedure for LT1933IS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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