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Analog Devices Inc. LT3433IFE#PBF
- Part No.:
- LT3433IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3433IFE#PBF.pdf
- Description:
- IC REG BCK BST ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:254
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Product details
Overview
LT3433IFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, single-inductor step-up/step-down DC/DC converter IC with dual 500mA internal switches, 4V–60V input range, 3.3V–20V output range, and fixed 200kHz current-mode switching. It enables seamless automatic mode transition between buck and bridged (buck-boost) operation in automotive load-dump and cold-crank systems.
For engineers reviewing the LT3433IFE#PBF datasheet, LT3433IFE#PBF pinout, LT3433IFE#PBF application, or LT3433IFE#PBF equivalent, key selection considerations include its 16-pin thermally enhanced TSSOP package, ±1% output voltage accuracy, 100µA Burst Mode quiescent current, frequency foldback protection, and dual-switch architecture enabling regulation when VIN < VOUT.
Technical Context
The LT3433IFE#PBF implements a fixed-frequency (185–215kHz) current-mode control architecture with integrated high-side boosted switch (RSWH(ON) = 0.8Ω) and low-side ground-referenced switch (RSWL(ON) = 0.6Ω). Its mode-control logic automatically enables bridged operation when duty cycle exceeds 75%, allowing continuous regulation across VIN < VOUT transitions without external topology change.
It features anti-slope compensation to maintain full 0.5–0.9A switch current limit independent of duty cycle, plus VFB-controlled frequency foldback (50–200kHz) and current-limit foldback (0.35–0.9A) for robust short-circuit and startup protection. The VC pin serves as integrator output for loop compensation, while BURST_EN enables/disables 100µA low-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports automotive 12V systems under load dump (up to 60V) and cold crank (down to 4V) |
| Output Voltage Range | 3.3V to 20V - programmable via resistor divider on VFB pin with 1.231V reference |
| Switch Current Limit | 0.5A to 0.9A - adjustable via VFB voltage; folds back to 0.35A at VFB = 0V for short-circuit protection |
| Quiescent Current | 100µA in Burst Mode - enables >10-year battery life in always-on automotive modules |
| Operating Frequency | 200kHz typical - fixed-frequency current mode ensures predictable EMI profile and stable loop design |
| Output Accuracy | ±1% - tight regulation over temperature and line/load conditions ensures reliable downstream power rail integrity |
| Shutdown Current | 10µA - enables deep sleep states in infotainment and ADAS subsystems |
Pinout & Package
LT3433IFE#PBF is housed in a 16-lead thermally enhanced TSSOP package with exposed pad (Pin 17), requiring soldering to SGND for optimal thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pins 1, 8, 9, 16) | Low-noise analog ground reference | Separate from PWRGND to minimize noise coupling into error amplifier and feedback path |
| VBST (Pin 2) | Boosted supply rail referenced to SW_H | Enables saturation of high-side switch; supports up to 75V differential (VBST – SW_H) |
| SW_H (Pin 3) | High-side switch emitter output | Current return for boosted switch; connects to inductor node in single-inductor buck-boost topology |
| VIN (Pin 4) | Main input power supply | Supplies boosted switch collector and internal bias circuitry; withstands 60V absolute max |
| BURST_EN (Pin 5) | Burst Mode enable/disable control | Pull ≤0.3V to enable 100µA no-load operation; pull ≥2V to disable for low-noise constant-frequency operation |
| VC (Pin 6) | Error amplifier output / integrator node | Drives current sense comparator threshold; RC network here sets dominant pole for loop stability |
| VFB (Pin 7) | Inverting input of error amplifier | Compares against 1.231V internal reference; also controls frequency and current-limit foldback functions |
| SS (Pin 10) | Soft-start timing node | 5µA current source charges external capacitor to ramp peak current limit and prevent output overshoot |
| SHDN (Pin 11) | Shutdown control input | Pull ≤0.4V to enter 10µA shutdown; includes hysteresis for glitch immunity |
| VBIAS (Pin 12) | Internal 2.6–2.9V regulated supply output | Can be externally powered (≥3V) to bypass internal VIN-to-VBIAS LDO and improve efficiency |
| VOUT (Pin 13) | Converter output voltage sensing node | Used internally for mode detection (buck vs. bridged); drives low-side switch bias |
| PWRGND (Pin 14) | High-current power ground | Return path for low-side switch emitter; separate from SGND to isolate high di/dt paths |
| SW_L (Pin 15) | Low-side switch collector output | Connects to inductor node opposite SW_H; enables bridged operation when VIN approaches VOUT |
| Exposed Pad (Pin 17) | Thermal pad | Mandatory connection to PCB ground plane for junction-to-board thermal resistance of 40°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate boost/buck converters or coupled inductors-reduces BOM count and board area by ~40% in wide-input systems |
| Automatic mode switching | Seamlessly transitions between buck and bridged operation at >75% duty cycle-no external control logic or firmware required |
| Anti-slope compensation | Maintains full 0.9A switch current limit across all duty cycles-prevents power derating at high VIN/VOUT ratios |
| Burst Mode operation | Reduces no-load IQ to 100µA while preserving >80% efficiency at 1mA load-critical for always-on telematics modules |
| Frequency & current-limit foldback | Slows switching to 50kHz and halves current limit during fault conditions-limits inductor stress and prevents thermal runaway at startup |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Field Bus Interface |
|---|---|
Use Scenario: Powering LCD display, audio codec, and MCU in head unit operating from vehicle battery (6V–16V) with load dump transients up to 60V. IC Role / Device Role / Timing Role: Primary DC/DC regulator providing stable 5V/3.3V rails; handles VIN < VOUT transitions during engine cranking. Use Value: Single-chip solution eliminates need for pre-regulator + secondary buck, reducing component count and improving transient response to battery dips. | Use Scenario: Generating isolated 12V rail from unregulated 24V industrial bus powering RS-485 transceivers and sensor front-ends. IC Role / Device Role / Timing Role: Non-isolated step-down/step-up converter delivering regulated output despite bus sag to 15V or surge to 36V. Use Value: Maintains regulation during brownouts without external supervision-enables uninterrupted communication in factory automation networks. |
| Portable Medical Device Battery Buffer | Smart Building HVAC Controller |
Use Scenario: Extending runtime of lithium-ion powered patient monitor by regulating 3.7V–4.2V battery to stable 3.3V system rail across full discharge curve. IC Role / Device Role / Timing Role: Bidirectional voltage translator ensuring continuous operation as battery drops below 3.3V. Use Value: Enables use of single-cell Li-ion instead of 2-cell stack-reducing size, weight, and cost while maintaining >90% efficiency down to 3.3V input. | Use Scenario: Powering microcontroller, wireless module, and analog sensors in battery-backed HVAC controller connected to 12V AC/DC adapter. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator accepting 9V–24V adapter output and maintaining 3.3V rail during AC dropout. Use Value: Eliminates need for backup supercapacitor charging circuit-simplifies design and improves reliability in commercial building environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Requires external MOSFETs; supports higher output current (10A+); no integrated switches | Suitable for high-power industrial supplies where thermal management allows discrete FETs | Select when >2A output current or custom FET optimization is required; not drop-in due to external power stage |
| MAX20404ATPA/VY+ | 3.5V–36V input; 5A integrated switches; uses different control architecture (constant-on-time) | Better suited for compact consumer electronics with tighter EMI constraints and lower VIN range | Choose for space-constrained designs needing higher current density; lacks LT3433's 60V rating and anti-slope compensation |
Compared with LTC3780EFE#PBF and MAX20404ATPA/VY+, the LT3433IFE#PBF offers unique integration of 60V tolerance, single-inductor topology, and anti-slope compensation-making it optimal for automotive and industrial systems requiring robustness across extreme input transients without external FETs.
Availability
LT3433IFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial field bus interfaces, and portable medical device battery buffering requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3433IFE#PBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3433IFE#PBF belongs to ADI's legacy Linear Technology Power Management product line, designed specifically for ruggedized DC/DC conversion in automotive, industrial, and aerospace applications demanding wide input voltage range and high reliability.
FAQ
What is the maximum input voltage rating for the LT3433IFE#PBF?
The LT3433IFE#PBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 4V to 60V. This makes the LT3433IFE#PBF suitable for 12V automotive systems that must survive load dump transients. Exceeding 60V may damage the device.
Does the LT3433IFE#PBF require external MOSFETs or is it fully integrated?
The LT3433IFE#PBF integrates both high-side and low-side power switches (500mA each) within the IC, eliminating the need for external MOSFETs. It uses a single inductor and requires only standard passive components-making the LT3433IFE#PBF a complete, compact step-up/step-down solution.
How does the LT3433IFE#PBF handle operation when input voltage falls below the output voltage?
When VIN drops near or below VOUT, the LT3433IFE#PBF automatically enables bridged (dual-switch) operation to maintain regulation. Its internal logic detects >75% duty cycle demand and activates the low-side switch, allowing the LT3433IFE#PBF to function as a step-up converter without external reconfiguration.
What is the purpose of the VBST pin on the LT3433IFE#PBF?
The VBST pin on the LT3433IFE#PBF provides a boosted gate drive supply referenced to the SW_H node, enabling full saturation of the high-side N-channel switch. A bootstrap capacitor between VBST and SW_H maintains this voltage, allowing the LT3433IFE#PBF to achieve low RDS(ON) and high efficiency even at high input voltages.
Can the LT3433IFE#PBF be used in Burst Mode and still meet strict EMI requirements?
While Burst Mode reduces quiescent current to 100µA, it introduces variable-frequency switching and higher output ripple. For strict EMI applications, the LT3433IFE#PBF can be configured for fixed-frequency operation by pulling BURST_EN ≥2V-ensuring consistent 200kHz switching and predictable spectral content as specified in the LT3433IFE#PBF datasheet.
LT3433IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3433IFE#PBF FAQ
1.How can I place an order for LT3433IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3433IFE#PBF 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 LT3433IFE#PBF reliable?
The price and inventory of LT3433IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3433IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3433IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3433IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3433IFE#PBF?
LT3433IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3433IFE#PBF 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 LT3433IFE#PBF?
For technical support, including LT3433IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3433IFE#PBF requirements.
6.How does Aetrix verify that LT3433IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3433IFE#PBF 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 LT3433IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3433IFE#PBF?
All LT3433IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3433IFE#PBF, 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 LT3433IFE#PBF part is unused and in its original packaging.
Return procedure for LT3433IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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