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Analog Devices Inc. LT1933HDCB#TRMPBF
- Part No.:
- LT1933HDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT1933HDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,257
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Product details
Overview
LT1933HDCB#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 thermally enhanced 6-lead (2mm × 3mm × 0.75mm) 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 - ideal for automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT1933HDCB#TRMPBF datasheet, LT1933HDCB#TRMPBF pinout, LT1933HDCB#TRMPBF application, or LT1933HDCB#TRMPBF equivalent, key selection criteria include its guaranteed –40°C to 150°C operating range, fixed 500kHz switching frequency, 1.245V feedback reference, cycle-by-cycle current limiting, and BOOST-pin-driven high-side switch drive architecture.
Technical Context
The LT1933HDCB#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 duty cycle via a transconductance-based servo loop.
It employs a bipolar NPN power switch driven by a BOOST pin voltage elevated above SW - requiring external diode and capacitor - enabling full saturation across wide VIN ranges. Frequency foldback activates below ~55kHz when FB voltage drops, improving overload and startup behavior.
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. |
| 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 - enables precise adjustable output down to 1.25V using external resistor divider. |
| Switching Frequency | 500kHz (±100kHz) - allows use of small 22–33μH inductors and ceramic capacitors for compact, low-ripple designs. |
| Shutdown Current | <2μA - ensures true output disconnect and ultra-low quiescent power in battery-powered sleep modes. |
| Operating Temperature | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Package Thermal Resistance | θJA = 73.5°C/W, θJC = 12°C/W - exposed pad (Pin 7) must be soldered to PCB ground plane for thermal integrity. |
Pinout & Package
LT1933HDCB#TRMPBF uses a 6-lead plastic DFN package (2mm × 3mm × 0.75mm) with exposed thermal pad (Pin 7 = GND). The package is RoHS-compliant, lead-free, and optimized for high-power density and thermal performance in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap drive supply | Provides elevated gate drive voltage (>VIN) to fully saturate internal NPN switch; requires external diode + 0.1μF capacitor. |
| GND (Pin 2 & Exposed Pad Pin 7) | Power and signal reference | Primary return path for switch current, IC bias, and feedback network; exposed pad must be soldered to PCB ground plane. |
| FB (Pin 3) | Output voltage sense input | Regulated to 1.245V; connects to resistor divider tap to set VOUT = 1.245V × (1 + R1/R2). |
| SHDN (Pin 4) | Enable/soft-start control | Logic-high ≥2.3V enables operation; logic-low ≤0.3V disables switch and reduces IQ to <2μA; RC ramp enables controlled soft-start. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch collector; must be locally bypassed with ≥2.2μF X7R/X5R ceramic capacitor. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed high-current switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation components; stable with ceramic output capacitors (no ESR dependency). |
| Thermally enhanced DFN package | θJC = 12°C/W enables 600mA continuous output at +125°C ambient without forced airflow. |
| Wide-input, high-voltage tolerance | VIN absolute max = 36V, BOOST absolute max = 43V - supports transient-tolerant 24V industrial and 12V automotive systems. |
| Programmable soft-start via SHDN pin | RC time constant on SHDN controls startup dI/dt, preventing input surge and output overshoot during power-up. |
| Frequency foldback under fault | Switching frequency drops to ~55kHz when FB voltage falls - limits peak inductor current during short-circuit or startup overload. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for infotainment microcontrollers and CAN transceivers under cold-crank (5.5V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, regulated low-voltage rail with undervoltage lockout and thermal shutdown. Use Value: Guaranteed operation to +150°C junction temperature and 36V absolute max VIN enable direct connection to automotive battery without pre-regulation. |
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus controllers from 24V industrial bus with high reliability and minimal heatsinking. IC Role / Device Role / Timing Role: Fixed-frequency step-down regulator delivering clean, stable 5V/3.3V rails with low EMI due to predictable 500kHz switching. Use Value: Internal compensation and ceramic-capacitor compatibility reduce BOM count and board area while maintaining stability across temperature and line/load variations. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter outputs to tightly regulated 3.3V for embedded networking devices and IoT gateways. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter replacing linear regulators to eliminate thermal derating and improve system efficiency. Use Value: 500kHz operation enables use of sub-3mm height inductors and 0402/0603 ceramics, supporting ultra-thin power supply designs. |
Use Scenario: Power management in portable test equipment and handheld meters where battery life and shutdown leakage are critical. IC Role / Device Role / Timing Role: Low-quiescent buck regulator with <2μA shutdown current enabling long-term storage and instant wake-up capability. Use Value: Soft-start prevents inrush into large output capacitance, avoiding brown-out of host MCU during battery-powered cold start. |
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; no BOOST pin required. | Optimized for low-input, high-efficiency portable apps; not suitable for 36V input or automotive temp range. | Select LTC3605EDE#TRPBF only for low-VIN, high-frequency, synchronous applications where footprint and efficiency outweigh input voltage range needs. |
| LMR14060QDDARQ1 | 600mA, 40V input, 2.1MHz sync buck, AEC-Q100 Grade 1 (–40°C to +125°C), integrated high-side FET. | Automotive-qualified but rated only to +125°C junction; lacks BOOST architecture for bipolar switch optimization at high VIN. | Choose LMR14060QDDARQ1 for AEC-Q100 compliance in non-under-hood locations; LT1933HDCB#TRMPBF remains preferred for +150°C under-hood use. |
Compared with LTC3605EDE#TRPBF and LMR14060QDDARQ1, the LT1933HDCB#TRMPBF uniquely combines 36V input tolerance, +150°C operation, and bipolar-switch BOOST drive - making it irreplaceable for high-temperature, wide-input industrial and automotive power stages where synchronous FET limitations or lower temp grades apply.
Availability
LT1933HDCB#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 and voltage ranges.
Supply support for LT1933HDCB#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 including the LT1933 family.
The LT1933 product line was designed specifically for high-input-voltage, high-temperature step-down conversion in automotive, industrial, and telecom infrastructure - emphasizing robustness, minimal external components, and thermal resilience in DFN packaging.
FAQ
What is the maximum input voltage rating for LT1933HDCB#TRMPBF?
The LT1933HDCB#TRMPBF has an absolute maximum input voltage (VIN) rating of 36V. Exceeding this voltage risks permanent damage. Its BOOST pin has a higher absolute maximum rating of 43V, but the device's functional input range remains 3.6V to 36V per datasheet specifications. Transient spikes beyond 36V must be clamped externally.
Does LT1933HDCB#TRMPBF require an external catch diode?
Yes, the LT1933HDCB#TRMPBF 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 recirculation during the off-time.
What is the purpose of the BOOST pin on LT1933HDCB#TRMPBF?
The BOOST pin on LT1933HDCB#TRMPBF supplies elevated drive voltage to the base of the internal bipolar NPN power switch, ensuring full saturation across the full 3.6V–36V input range. It requires an external diode and capacitor (e.g., 1N4148 + 0.1μF) connected between VIN and BOOST to generate a voltage ~VOUT above SW.
Can LT1933HDCB#TRMPBF operate at full load in a +125°C ambient environment?
Yes - the LT1933HDCB#TRMPBF is rated for operation from –40°C to +150°C junction temperature. With proper PCB thermal design (exposed pad soldered to ≥2 cm² copper), it can deliver 600mA continuously at +125°C ambient, as validated by its θJA = 73.5°C/W and thermal characterization data.
How is output voltage programmed on LT1933HDCB#TRMPBF?
Output voltage is programmed via a resistor divider from VOUT to FB, setting FB = 1.245V. Use R2 = 10kΩ and calculate R1 = R2 × (VOUT/1.245 – 1). For example, for 5V output: R1 = 10k × (5/1.245 – 1) ≈ 30.2kΩ. R2 should be ≤20kΩ to minimize bias current error.
LT1933HDCB#TRMPBF 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 ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LT1933HDCB#TRMPBF FAQ
1.How can I place an order for LT1933HDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933HDCB#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 LT1933HDCB#TRMPBF reliable?
The price and inventory of LT1933HDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933HDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1933HDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933HDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933HDCB#TRMPBF?
LT1933HDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933HDCB#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 LT1933HDCB#TRMPBF?
For technical support, including LT1933HDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933HDCB#TRMPBF requirements.
6.How does Aetrix verify that LT1933HDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1933HDCB#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 LT1933HDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1933HDCB#TRMPBF?
All LT1933HDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933HDCB#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 LT1933HDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LT1933HDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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