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Analog Devices Inc. LT3433EFE#TRPBF
- Part No.:
- LT3433EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3433EFE#TRPBF.pdf
- Description:
- IC REG BCK BST ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,551
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Product details
Overview
LT3433EFE#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 to 60V input range, 3.3V to 20V output range, and fixed 200kHz current-mode operation. It enables seamless automatic mode switching between buck and bridged (buck-boost) topologies in automotive load-dump and cold-crank systems.
For engineers reviewing the LT3433EFE#TRPBF datasheet, LT3433EFE#TRPBF pinout, LT3433EFE#TRPBF application, or LT3433EFE#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 LT3433EFE#TRPBF implements a fixed-frequency current-mode control architecture with integrated high-side (RSWH(ON) = 0.8Ω) and low-side (RSWL(ON) = 0.6Ω) N-channel MOSFETs. Its mode-control logic automatically transitions from single-switch buck to dual-switch bridged operation when required duty cycle exceeds 75%, maintaining regulation as VIN approaches or falls below VOUT.
It features programmable soft-start (3–9µA SS current), feedback reference voltage of 1.231V (±0.6%), and dual foldback protections: oscillator frequency reduces from 200kHz to 50kHz and switch current limit halves when VFB drops below 0.6V - enhancing robustness during start-up and short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports automotive battery systems including 12V/24V rails with load dump (60V transients) and cold crank (4V minimum). |
| Output Voltage Range | 3.3V to 20V - set via external resistor divider on VFB pin with 1.231V internal reference. |
| Switch Current Limit | 0.5A to 0.9A - adjustable via VFB voltage; folds back to 0.35A at VFB = 0V for safe short-circuit handling. |
| Quiescent Current | 100µA in Burst Mode - enables >1000-hour battery life in always-on vehicle modules. |
| Operating Frequency | 185–215kHz - fixed-current-mode oscillator with ±5% tolerance; immune to duty-cycle-induced instability due to anti-slope compensation. |
| Feedback Accuracy | ±1% over temperature - ensures stable output regulation across –40°C to 125°C junction range. |
| Shutdown Current | 10–25µA - ultra-low power disable state for system-level power gating. |
Pinout & Package
LT3433EFE#TRPBF is housed in a 16-lead thermally enhanced TSSOP package with exposed thermal pad (Pin 17), requiring soldering to SGND for optimal thermal performance (θJC = 10°C/W). Pin functions are validated per Linear Technology's official datasheet revision 3433f.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pins 1, 8, 9, 16) | Low-noise analog ground reference | Separates error amplifier and VC node return from high-current PWRGND; must be star-connected to minimize noise coupling. |
| VBST (Pin 2) | Boosted gate drive supply | Bootstrapped rail referenced to SW_H; supplies >30mA peak current to saturate high-side switch; max 75V relative to GND. |
| SW_H (Pin 3) | High-side switch output | Emitter of internal N-MOSFET; connects to inductor high side; RDS(ON) = 0.8Ω at 500mA. |
| VIN (Pin 4) | Main input power supply | Supplies boosted switch and bias circuitry; withstands 60V absolute max; bypass capacitor required. |
| BURST_EN (Pin 5) | Burst Mode enable/disable control | Pull ≤0.3V to enable 100µA no-load mode; pull ≥2V to disable burst and fix 200kHz operation. |
| VC (Pin 6) | Error amplifier output | Integrator node setting peak switch current per cycle; external RC network sets loop compensation pole. |
| VFB (Pin 7) | Feedback voltage sense input | Compares output divider voltage to 1.231V reference; controls both regulation and foldback functions. |
| SW_L (Pin 15) | Low-side switch output | Collector of internal N-MOSFET; connects to inductor low side; RDS(ON) = 0.6Ω at 500mA. |
| VOUT (Pin 13) | Converter output sensing node | Determines mode selection (buck vs bridged); provides bias for low-side gate drive. |
| 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 PCB area in wide-input systems. |
| Anti-slope compensation | Maintains full 0.9A current limit across all duty cycles - avoids traditional slope-compensation-induced current derating above 50% duty. |
| Automatic mode switching | Seamlessly transitions between buck and bridged operation at >75% duty threshold - preserves regulation without external control logic. |
| Frequency & current limit foldback | Reduces switching frequency to 50kHz and halves current limit during fault conditions - limits inductor energy buildup and improves reliability. |
| VBIAS pin for external biasing | Allows powering internal circuitry from VOUT instead of VIN - eliminates ~300mW dissipation in internal VIN-to-VBIAS LDO at high input voltages. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Rail Buffer |
|---|---|
Use Scenario: Powering display backlight and audio amplifiers in head units subjected to 60V load dump and 4V cold crank. IC Role / Device Role / Timing Role: Primary wide-input DC/DC regulator providing stable 5V/3.3V rails from unregulated 12V battery. Use Value: Maintains regulation during extreme transients without external TVS or pre-regulator - simplifies front-end design and improves MTBF. | Use Scenario: Generating isolated 12V/15V outputs from factory floor 24V distribution bus with brownout resilience. IC Role / Device Role / Timing Role: Step-down/step-up converter enabling consistent output despite upstream voltage sags or surges. Use Value: Eliminates need for separate buck and boost stages - reduces component count by 40% versus dual-converter solution. |
| Battery-Powered Telematics Module | Wall Adapter Input Flexibility |
Use Scenario: Long-life GPS tracker powered by Li-ion or lead-acid battery with sleep-mode current budget <100µA. IC Role / Device Role / Timing Role: Main system power controller operating in Burst Mode during standby. Use Value: Achieves 100µA no-load IQ - extends battery runtime beyond 12 months in periodic-reporting applications. | Use Scenario: Universal input power stage accepting 9–24V wall adapters for consumer electronics with variable input sources. IC Role / Device Role / Timing Role: Input-flexible DC/DC stage delivering fixed 5V USB-compliant output. Use Value: Supports multiple adapter types without redesign - accelerates time-to-market for multi-region product variants. |
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 up to 40V input; higher efficiency at >2A loads but larger solution size. | Used where higher output current (>1.5A) and synchronous rectification are needed. | Select LTC3789EFE#PBF only if discrete FET control and >1.5A continuous output are required - not a drop-in replacement. |
| MAX17595ATP+T | Fixed 3.3V/5V outputs only; no programmable VOUT; lacks Burst Mode; 60V max input same, but no bridged mode. | Suitable for cost-sensitive fixed-output applications without wide-VIN transient resilience needs. | Choose MAX17595ATP+T only for fixed-output, non-automotive designs where programmability and foldback protection are unnecessary. |
Compared with LTC3789EFE#PBF and MAX17595ATP+T, the LT3433EFE#TRPBF uniquely integrates dual switches, programmable output, Burst Mode, and automatic bridged operation in a compact TSSOP - making it optimal for space-constrained, wide-input, low-IQ automotive and industrial power nodes.
Availability
LT3433EFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V rail buffering, and battery-powered telematics requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3433EFE#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 the LT® family.
The LT3433EFE#TRPBF belongs to Linear's high-voltage monolithic DC/DC converter product line, designed specifically for automotive, industrial, and battery-backed systems demanding wide input range, high reliability, and minimal external components.
FAQ
What is the maximum input voltage rating for the LT3433EFE#TRPBF?
The LT3433EFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 4V to 60V. This allows direct connection to 12V and 24V automotive batteries while surviving load-dump transients up to 60V without external clamping - a key requirement for AEC-Q100-compliant designs.
Does the LT3433EFE#TRPBF require external MOSFETs?
No, the LT3433EFE#TRPBF integrates two internal 500mA N-channel MOSFETs - one high-side switch (RSWH(ON) = 0.8Ω) and one low-side switch (RSWL(ON) = 0.6Ω). This eliminates external FETs, gate drivers, and associated layout complexity, enabling a complete single-inductor buck-boost solution with only passive components.
How does the LT3433EFE#TRPBF handle output voltage regulation when input voltage drops below output voltage?
The LT3433EFE#TRPBF automatically switches from buck to bridged (dual-switch) operation when duty cycle exceeds 75%, allowing it to regulate even when VIN falls below VOUT. In bridged mode, the full input voltage appears across the inductor during switch-on time, reducing required duty cycle and maintaining stable 3.3V–20V output without external intervention.
What is the purpose of the VBIAS pin on the LT3433EFE#TRPBF?
The VBIAS pin on the LT3433EFE#TRPBF provides access to the internal 2.6–2.9V linear regulator output that powers most internal circuitry. Driving VBIAS externally (e.g., from VOUT) bypasses the VIN-to-VBIAS LDO, eliminating its power loss - improving efficiency by up to 5% at high input voltages and reducing thermal stress on the LT3433EFE#TRPBF die.
Can the LT3433EFE#TRPBF be used in AEC-Q200 qualified automotive applications?
Yes - the LT3433EFE#TRPBF is specified for operation from –40°C to +125°C junction temperature and packaged in a thermally enhanced TSSOP with exposed pad. While not formally AEC-Q200 certified as a discrete component, its electrical specifications, thermal design, and qualification history make it widely deployed in automotive infotainment, body control, and telematics modules meeting AEC-Q200 system-level requirements.
LT3433EFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3433EFE#TRPBF FAQ
1.How can I place an order for LT3433EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3433EFE#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 LT3433EFE#TRPBF reliable?
The price and inventory of LT3433EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3433EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3433EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3433EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3433EFE#TRPBF?
LT3433EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3433EFE#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 LT3433EFE#TRPBF?
For technical support, including LT3433EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3433EFE#TRPBF requirements.
6.How does Aetrix verify that LT3433EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3433EFE#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 LT3433EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3433EFE#TRPBF?
All LT3433EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3433EFE#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 LT3433EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3433EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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