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Analog Devices Inc. LT3433IFE#TRPBF
- Part No.:
- LT3433IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3433IFE#TRPBF.pdf
- Description:
- IC REG BCK BST ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,039
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Product details
Overview
LT3433IFE#TRPBF 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#TRPBF datasheet, LT3433IFE#TRPBF pinout, LT3433IFE#TRPBF application, or LT3433IFE#TRPBF equivalent, key selection considerations include its ±1% output voltage accuracy, 100µA Burst Mode quiescent current, frequency foldback protection, anti-slope compensation for duty-cycle-independent current limiting, and thermally enhanced 16-lead TSSOP package with exposed pad.
Technical Context
The LT3433IFE#TRPBF implements a fixed-frequency current-mode control architecture with integrated dual N-channel MOSFETs - a high-side boosted switch (RSWH(ON) = 0.8Ω) and a low-side ground-referenced switch (RSWL(ON) = 0.6Ω). Its mode-control logic automatically transitions from single-switch buck to dual-switch bridged operation when required duty cycle exceeds 75%, enabling regulation even when VIN < VOUT.
It features anti-slope compensation that maintains full 0.7A switch current limit across all duty cycles by adding a matched ramp to the current-limit threshold, eliminating conventional slope-compensation-induced current derating. The VC pin serves as integrator output for loop compensation, while VFB (1.231V reference) controls both oscillator frequency foldback (50kHz–200kHz) and current-limit foldback (0.35A–0.7A).
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 external resistor divider on VFB pin |
| Switch Current Limit | 0.5A to 0.9A typical - fixed over temperature; foldback reduces to 0.35A at VFB = 0V for short-circuit robustness |
| Quiescent Current | 100µA in Burst Mode - enables >1000-hour battery standby in always-on vehicle modules |
| Operating Frequency | 185kHz to 215kHz - fixed 200kHz nominal with ±5% tolerance; foldback to 50kHz at light load |
| Output Accuracy | ±1% over temperature - ensures stable rail generation for sensitive analog or MCU supplies |
| Package | 16-lead thermally enhanced TSSOP with exposed pad - θJC = 10°C/W enables >1W continuous power dissipation |
Pinout & Package
LT3433IFE#TRPBF is housed in a 16-lead plastic TSSOP package with an exposed thermal pad (Pin 17) that must be soldered to SGND for optimal junction-to-board thermal resistance (θJB = 20°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pins 1, 8, 9, 16) | Low-noise analog ground reference | Separate return path for error amplifier, VC integrator, and feedback network - must be star-connected to minimize noise coupling |
| VBST (Pin 2) | Boosted gate drive supply | Bootstrap rail referenced to SW_H; enables saturation of high-side switch up to 75V differential (VBST – SW_H ≤ 20V) |
| SW_H (Pin 3) | High-side switch emitter | Current return for boosted switch; connects internally to VIN when active; requires external bootstrap diode and capacitor |
| VIN (Pin 4) | Main input power supply | Supplies boosted switch collector and internal bias circuits; absolute max rating = 60V |
| BURST_EN (Pin 5) | Burst Mode enable/disable control | Pull ≤0.3V to enable 100µA quiescent mode; pull ≥2V to disable burst and fix 200kHz operation |
| VC (Pin 6) | Error amplifier output | Integrator node for loop compensation; sets peak switch current per cycle; connects to RC network for dominant pole placement |
| VFB (Pin 7) | Feedback voltage sense input | Compares against 1.231V internal reference; also controls frequency foldback and current-limit foldback functions |
| SW_L (Pin 15) | Low-side switch collector | Ground-referenced output switch; shorts to PWRGND when active; RSWL(ON) = 0.6Ω typical |
| VOUT (Pin 13) | Regulated output voltage node | Used for mode detection (buck vs bridged); provides bias for low-side gate drive; bypass with ≥0.1µF ceramic |
| SHDN (Pin 11) | Shutdown control input | Pull ≤0.4V to enter 10µA shutdown; hysteresis prevents glitch-induced toggling |
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% vs dual-converter solutions |
| Automatic buck/bridged mode switching | Seamlessly transitions at >75% duty cycle threshold without external control - maintains regulation during VIN dip below VOUT (e.g., engine cranking) |
| Anti-slope compensation | Maintains full 0.7A switch current limit independent of duty cycle - avoids power derating in high-VIN/low-VOUT conditions where conventional slope compensation fails |
| Burst Mode operation | Reduces no-load IQ to 100µA while preserving >85% efficiency at 1mA load - extends battery life in always-on telematics and ADAS modules |
| Frequency and current-limit foldback | Both functions activate simultaneously at low VFB (<0.8V), limiting inductor current runaway during startup or short-circuit events without requiring external fault circuitry |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Field Bus Interface |
|---|---|
Use Scenario: Powering LCD display, audio codec, and microcontroller in head-unit systems subjected to 60V load dump and 4V cold crank transients. IC Role / Device Role / Timing Role: Primary wide-input DC/DC regulator delivering stable 5V/3.3V rails from vehicle battery; handles automatic mode switching during voltage sags. Use Value: Eliminates need for upstream TVS + LDO staging; achieves >88% efficiency at 100mA load across full 4V–60V input range. | Use Scenario: Generating isolated 12V and 5V rails for RS-485 transceivers and sensor front-ends in factory automation equipment powered from unregulated 24V DC bus. IC Role / Device Role / Timing Role: Non-isolated buck-boost converter providing regulated output despite ±25% bus variation and high ripple. Use Value: Maintains regulation during brownouts (down to 18V) and overvoltage (up to 30V); soft-start prevents inrush into downstream capacitive loads. |
| Portable Medical Diagnostic Device | Smart Building HVAC Controller |
Use Scenario: Battery-buffered power for ultrasound imaging subsystem requiring clean 3.3V and 12V rails from 2-cell Li-ion (6V–8.4V) or wall adapter (9V–24V). IC Role / Device Role / Timing Role: Dual-rail step-up/step-down converter supporting both battery and adapter inputs without manual reconfiguration. Use Value: Delivers 500mA at 12V with <15mVpp output ripple; Burst Mode extends 2000mAh battery runtime to >48 hours in standby. | Use Scenario: Powering Zigbee/Wi-Fi SoC, temperature sensors, and relay drivers in battery-backed HVAC zone controllers operating from 12V lead-acid or energy-harvesting sources. IC Role / Device Role / Timing Role: Low-quiescent buck-boost regulator maintaining 3.3V system rail during deep discharge (down to 9.5V) and intermittent solar charging. Use Value: 10µA shutdown current enables >10-year shelf life; programmable soft-start prevents reset glitches during wake-from-sleep transitions. |
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 |
|---|---|---|---|
| LTC3789EFE#PBF | Requires external MOSFETs; supports 4V–36V input; higher 10A output capability; no integrated switches | Suitable for high-current (>2A) designs needing flexibility in FET selection and thermal layout | Select LTC3789EFE#PBF only when >1A output current or discrete FET optimization is required - LT3433IFE#TRPBF offers lower BOM cost and faster time-to-market for ≤500mA applications |
| MAX20404ATPA/VY+ | 3.5V–36V input; 2.5V–5.5V output; integrated 2.5A/1.5A dual switches; 2.2MHz switching; no Burst Mode | Better suited for space-constrained consumer electronics; lacks high-voltage tolerance and foldback protection | Choose MAX20404ATPA/VY+ for compact 5V USB-C PD sink designs; LT3433IFE#TRPBF remains preferred for industrial/automotive 4V–60V ruggedness and fault resilience |
Compared with LTC3789EFE#PBF and MAX20404ATPA/VY+, the LT3433IFE#TRPBF uniquely combines 60V input tolerance, integrated dual 500mA switches, anti-slope compensation, and Burst Mode in a single TSSOP package - making it optimal for cost-sensitive, medium-power automotive and industrial converters where reliability under transient stress is critical.
Availability
LT3433IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial field bus interfaces, portable medical diagnostics, and smart building HVAC controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3433IFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT3433IFE#TRPBF belongs to ADI's legacy Linear Technology DC/DC converter product line, engineered specifically for rugged, wide-input-voltage power conversion in automotive and industrial environments where load dump, cold crank, and long-term reliability are design imperatives.
FAQ
What is the maximum input voltage rating for the LT3433IFE#TRPBF?
The LT3433IFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 4V to 60V. This makes the LT3433IFE#TRPBF suitable for 12V automotive systems experiencing load dump transients. Exceeding 60V may cause permanent damage, and operation below 4V will trigger undervoltage lockout (UVLO) at 3.4V.
Does the LT3433IFE#TRPBF support true step-up operation when VIN is less than VOUT?
Yes, the LT3433IFE#TRPBF supports true step-up operation via its automatic bridged (dual-switch) mode. When VIN drops near or below VOUT - requiring >75% duty cycle in buck mode - the LT3433IFE#TRPBF enables the low-side switch to pull the inductor's output side to ground, effectively converting to a buck-boost topology. This allows stable regulation even with VIN as low as 4V and VOUT set to 12V.
How does the anti-slope compensation in the LT3433IFE#TRPBF improve performance over standard slope compensation?
The LT3433IFE#TRPBF uses anti-slope compensation to preserve full 0.7A switch current limit across all duty cycles. Unlike standard slope compensation - which reduces effective current limit as duty cycle increases - the LT3433IFE#TRPBF adds a matching ramp to the current-limit threshold. This ensures consistent power delivery in high-VIN/low-VOUT conditions (e.g., 48V input → 3.3V output), where conventional controllers would derate by up to 30%.
Can the LT3433IFE#TRPBF be used without the VBIAS pin connected?
Yes, the LT3433IFE#TRPBF can operate with VBIAS left unconnected, as its internal 2.6V–2.9V linear regulator powers most circuitry from VIN. However, connecting VBIAS to VOUT (via diode) or an external 3V+ supply improves efficiency by bypassing the VIN-to-VBIAS dropout loss. Leaving VBIAS floating is acceptable but forfeits this efficiency gain and may slightly increase total input current.
What thermal management is required for the LT3433IFE#TRPBF in continuous 500mA operation?
For continuous 500mA output at 12V input/5V output, the LT3433IFE#TRPBF dissipates ~0.8W. Its 16-lead TSSOP package has θJC = 10°C/W; therefore, the exposed pad (Pin 17) must be soldered to a minimum 100mm² copper pour tied to SGND. With proper PCB thermal relief, junction temperature stays below 105°C at 25°C ambient - well within the –40°C to 125°C rated operating range of the LT3433IFE#TRPBF.
LT3433IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3433IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3433IFE#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 LT3433IFE#TRPBF reliable?
The price and inventory of LT3433IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3433IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3433IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3433IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3433IFE#TRPBF?
LT3433IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3433IFE#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 LT3433IFE#TRPBF?
For technical support, including LT3433IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3433IFE#TRPBF requirements.
6.How does Aetrix verify that LT3433IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3433IFE#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 LT3433IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3433IFE#TRPBF?
All LT3433IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3433IFE#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 LT3433IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3433IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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