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Analog Devices Inc. LT1933IDCB#TRPBF
- Part No.:
- LT1933IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1933IDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,287
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Product details
Overview
LT1933IDCB#TRPBF 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 2mm × 3mm DFN 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 regulation in automotive battery, industrial control, and wall transformer applications.
For engineers reviewing the LT1933IDCB#TRPBF datasheet, LT1933IDCB#TRPBF pinout, LT1933IDCB#TRPBF application, or LT1933IDCB#TRPBF equivalent, key selection considerations include its fixed 500kHz switching frequency, 1.245V feedback reference, BOOST pin voltage requirements, thermal performance in the DCB package (θJC = 12°C/W), and compatibility with ceramic input/output capacitors for low-ripple, space-constrained designs.
Technical Context
The LT1933IDCB#TRPBF implements constant-frequency current-mode control using an internal RS flip-flop oscillator and slope-compensated current sensing. Its error amplifier servo-controls the VC node to regulate the FB pin at 1.245V, directly setting output voltage via external resistor divider (VOUT = 1.245V × (1 + R1/R2)).
Operation relies on external BOOST circuitry (diode + capacitor) to generate >VIN drive voltage for the internal bipolar switch, ensuring saturation and low VCESAT (~370mV at 400mA). Frequency foldback activates below ~55kHz when FB voltage drops, limiting output current during startup or overload.
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 cold-crank margin. |
| Switching Frequency | 500kHz (typical) - enables use of small 22μH inductors and 2.2μF ceramic input capacitors. |
| 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 over temp) - sets precise output voltage with external resistive divider; R2 ≤ 20kΩ recommended. |
| Shutdown Current | <2μA - ensures true output disconnect and ultra-low quiescent drain in battery-powered systems. |
| Operating Temperature | –40°C to +125°C - rated for extended industrial and under-hood automotive environments. |
| Package Thermal Resistance | θJC = 12°C/W - exposed pad (Pin 7) must be soldered to PCB ground plane for effective junction-to-case heat transfer. |
Pinout & Package
LT1933IDCB#TRPBF uses a 6-lead (2mm × 3mm × 0.75mm) plastic DFN package with exposed thermal pad (Pin 7, GND). The exposed pad is electrically connected to ground and must be soldered to the PCB for thermal and electrical integrity.
| 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 switch; max 43V absolute rating. |
| GND (Pin 2 & Exposed Pad Pin 7) | Power and signal reference | Primary ground return for internal regulator, feedback divider, and thermal path; exposed pad is mandatory GND connection. |
| FB (Pin 3) | Voltage feedback input | Servo point regulated to 1.245V; connects to resistor divider tap between VOUT and GND to set output voltage. |
| SHDN (Pin 4) | Enable/soft-start control | Logic-high (≥2.3V) enables operation; grounded disables converter and reduces IQ to <2μA; RC ramp enables controlled start-up. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch driver; requires local 2.2μF ceramic bypass placed adjacent to pin. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor anode; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation components; stable with ceramic output capacitors (no ESR dependency). |
| Cycle-by-cycle current limit | Protects against shorted outputs by limiting peak switch current to 0.75A (min), with slope compensation reducing limit at high duty cycles. |
| Soft-start via SHDN pin | External RC network on SHDN generates controlled voltage ramp, limiting inrush current and preventing output overshoot. |
| Low-profile DFN package | 2mm × 3mm footprint with 0.75mm height and exposed thermal pad - optimized for space-constrained PCB layouts. |
| Wide input range with UVLO | Undervoltage lockout activates below ~3.35V, preventing erratic operation during brownout or startup from weak sources. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-sensitive power domain with cold-crank tolerance down to 3.6V input. Use Value: Maintains regulation during engine cranking transients; <2μA shutdown extends battery life in sleep mode. |
Use Scenario: Powering PLC I/O modules and sensor interfaces from 24V industrial bus rails. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage delivering stable 5V/600mA to noise-sensitive analog front-ends. Use Value: 500kHz switching allows small magnetics; DFN package withstands vibration and thermal cycling in DIN-rail enclosures. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC adapter output to clean 3.3V for embedded Wi-Fi modules. IC Role / Device Role / Timing Role: Efficient step-down regulator eliminating need for linear post-regulation and associated heat dissipation. Use Value: >85% efficiency across 5–24V input range minimizes thermal load in sealed plastic enclosures. |
Use Scenario: Supplying 5V to portable medical monitors powered by Li-ion packs (8.4–12.6V). IC Role / Device Role / Timing Role: Low-quiescent buck converter enabling multi-week standby with periodic wake-up bursts. Use Value: <2μA shutdown current preserves battery capacity; soft-start prevents voltage droop during MCU wake-up sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14020SQDDARQ1 | 40V input, 2A MOSFET-based buck; requires external compensation; higher IQ (26μA shutdown). | Automotive AEC-Q100 qualified; supports higher current loads but larger solution size. | Choose for AEC-Q100 compliance and >600mA demand; avoid if DFN footprint or <2μA shutdown is mandatory. |
| TPS54202DRCT | 6V–17V input, 2A integrated FET; 500kHz sync capability; 2.5μA shutdown; requires external compensation. | Lower input range; optimized for 12V rail conversion; no BOOST pin dependency. | Choose for cost-sensitive 12V systems where input never exceeds 17V; not suitable for 24V industrial or automotive battery inputs. |
Compared with LMR14020SQDDARQ1 and TPS54202DRCT, the LT1933IDCB#TRPBF offers unique combination of ultra-low shutdown current, bipolar switch architecture enabling wide VIN (3.6–36V), and internal compensation - making it optimal for space- and quiescent-current-constrained industrial and automotive auxiliary supplies where external compensation complexity must be avoided.
Availability
LT1933IDCB#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 LT1933IDCB#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1933 series.
The LT1933 belongs to Linear's precision monolithic DC/DC converter family, designed specifically for high-input-voltage, low-output-current applications where small size, low quiescent current, and robust thermal performance in DFN packages are critical.
FAQ
What is the maximum output current capability of the LT1933IDCB#TRPBF?
The LT1933IDCB#TRPBF delivers up to 600mA continuously at 3.3V output from a 12–36V input, and 600mA at 5V from a 16–36V input, as validated in the datasheet's typical applications. Peak switch current is limited to 0.75A minimum, and actual achievable output depends on thermal design, inductor selection, and ambient temperature. At 125°C junction temperature, derating applies per thermal resistance data (θJC = 12°C/W).
Does the LT1933IDCB#TRPBF require external compensation components?
No, the LT1933IDCB#TRPBF is internally compensated and does not require external compensation components. Its current-mode architecture eliminates dependency on output capacitor ESR for stability, allowing direct use with low-ESR ceramic capacitors. This simplifies design and reduces bill-of-materials count compared to voltage-mode controllers requiring RC networks on the compensation pin.
How is the output voltage set on the LT1933IDCB#TRPBF?
The output voltage of the LT1933IDCB#TRPBF is set using a resistive divider connected between VOUT and GND, with the FB pin (Pin 3) tied to the divider midpoint. The device regulates FB to 1.245V, so VOUT = 1.245V × (1 + R1/R2). A standard value for R2 is 10kΩ; R1 is calculated accordingly. R2 should be ≤20kΩ to minimize bias current error, as FB pin bias current is specified at 40–120nA.
What is the role of the BOOST pin on the LT1933IDCB#TRPBF?
The BOOST pin (Pin 1) on the LT1933IDCB#TRPBF provides gate drive voltage higher than VIN to fully saturate the internal bipolar NPN power switch. It is charged via an external diode and capacitor (e.g., 0.1μF + 1N4148) from the SW node. BOOST must remain ≥2.3V above SW for optimal efficiency; exceeding 43V absolute maximum rating risks damage. This architecture enables high efficiency across the full 3.6–36V input range.
Can the LT1933IDCB#TRPBF operate with ceramic input and output capacitors?
Yes, the LT1933IDCB#TRPBF is explicitly designed for ceramic capacitors: a minimum 2.2μF X7R/X5R ceramic is required at VIN, and ceramic output capacitors (e.g., 22μF for 3.3V) are recommended for low ripple and fast transient response. Its current-mode control and internal compensation ensure stability without relying on capacitor ESR - unlike many older buck controllers that require tantalum or aluminum electrolytics for phase margin.
LT1933IDCB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- 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:
- 6-DFN (2x3)
LT1933IDCB#TRPBF FAQ
1.How can I place an order for LT1933IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933IDCB#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 LT1933IDCB#TRPBF reliable?
The price and inventory of LT1933IDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933IDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1933IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933IDCB#TRPBF?
LT1933IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933IDCB#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 LT1933IDCB#TRPBF?
For technical support, including LT1933IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933IDCB#TRPBF requirements.
6.How does Aetrix verify that LT1933IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1933IDCB#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 LT1933IDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1933IDCB#TRPBF?
All LT1933IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933IDCB#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 LT1933IDCB#TRPBF part is unused and in its original packaging.
Return procedure for LT1933IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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