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Analog Devices Inc. LT3492IFE#TRPBF
- Part No.:
- LT3492IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3492IFE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,102
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Product details
Overview
LT3492IFE#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC operating in buck, boost, or buck-boost topology with integrated 600mA/60V NPN switches and PMOS gate drivers. It delivers up to 3000:1 PWM dimming per channel at 100Hz, supports 3V–30V input, and features adjustable switching frequency (330kHz–2.1MHz) for RGB lighting and automotive display backlighting.
For engineers reviewing the LT3492IFE#TRPBF datasheet, LT3492IFE#TRPBF pinout, LT3492IFE#TRPBF application, or LT3492IFE#TRPBF equivalent, key selection criteria include per-channel current sense threshold control via CTRL pins (10mV–100mV), open-LED protection on all three outputs, and TSSOP-28 package compatibility with thermal pad grounding requirements.
Technical Context
The LT3492IFE#TRPBF implements fixed-frequency current-mode control across three independent channels, each with replicated error amplifiers, PWM comparators, and NPN power switches. Its architecture enables stable regulation over wide VIN (3V–30V) and VOUT ranges while supporting multiple topologies via external component configuration.
Each channel integrates dedicated ISP/ISN current-sense inputs, VC compensation nodes, OVP fault detection (1V threshold), and TG gate drivers for external P-channel MOSFETs-enabling true-color PWM dimming with minimal current ripple and fast gate turn-on/off (<110ns). The shared oscillator, reference, and UVLO circuitry reduce inter-channel coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous operation; transient-rated to 40V for ≤1s - enables direct connection to 12V/24V automotive rails without pre-regulation. |
| Switch Current Limit | 600mA typical per channel (1000mA max) - sets maximum LED string current and defines inductor sizing constraints. |
| LED Dimming Ratio | 3000:1 PWM dimming at 100Hz - achieves high-fidelity grayscale control in signage and avionic displays without color shift. |
| CTRL Pin Threshold Range | 10mV to 100mV full-scale current sense voltage - allows precise analog current setting from 30mA to 300mA using standard sense resistors. |
| Switching Frequency Range | 330kHz to 2.1MHz via FADJ pin - balances efficiency (lower fSW) vs. solution size (higher fSW) and EMI profile. |
| Open-LED Protection | OVP1–OVP3 pins trigger shutdown at >1V input - prevents overvoltage damage when LED strings open during operation. |
| Thermal Rating | –40°C to +125°C junction temperature - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
LT3492IFE#TRPBF uses a 28-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 29 = GND), requiring soldering to PCB ground plane for thermal management and low-impedance return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal bias circuits and switch drivers; requires local 1μF ceramic bypass capacitor. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three channels; logic-low (<0.4V) reduces quiescent current to 0.1μA. |
| PWM1–PWM3 | Per-channel dimming enable | Active-high signals that gate LED current flow and place VC pins in high-Z state during off-time. |
| CTRL1–CTRL3 | Current sense threshold adjust | Sets ISP–ISN voltage (10mV–100mV) to program LED current; must not be left floating. |
| TG1–TG3 | P-channel MOSFET gate driver output | Drives external PMOS disconnect switch; limits ISP–TG voltage to 6.5V for gate protection. |
| ISP1–ISP3 / ISN1–ISN3 | Differential current sense inputs | Connect across external sense resistor; high-impedance inputs require Kelvin routing to avoid accuracy loss. |
| OVP1–OVP3 | Open-LED fault monitor | Monitors output voltage divider; >1V input disables respective channel's main switch. |
| FADJ | Frequency adjustment input | Voltage-controlled oscillator input (0.1V–1.5V) sets switching frequency from 330kHz to 2.1MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent LED drivers | Three fully isolated current-regulated channels with separate PWM, CTRL, OVP, and compensation pins - enables mixed-voltage LED strings (e.g., red/green/blue) without cross-talk. |
| True Color PWM™ dimming | 3000:1 dimming ratio at 100Hz with linear light output - preserves color point across entire brightness range in RGB systems. |
| Built-in PMOS gate drivers | Integrated TG outputs drive external P-channel MOSFETs to disconnect LEDs during PWM off-time - eliminates residual current leakage and improves dimming fidelity. |
| Adjustable switching frequency | 330kHz–2.1MHz via single FADJ pin - allows optimization of inductor size, efficiency, and EMI filtering for specific board layout constraints. |
| Wide input voltage range | Operates from 3V to 30V with 40V transient tolerance - supports direct battery input in automotive, marine, and industrial applications without external protection. |
| Open-LED protection per channel | Dedicated OVP1–OVP3 pins with 1V threshold - isolates faulted channel while maintaining operation of remaining two channels for system redundancy. |
Applications
| Automotive Interior Lighting | RGB Backlighting for Instrument Clusters |
|---|---|
|
Use Scenario: Driving multi-color LED arrays behind TFT LCD instrument panels with variable ambient light conditions. IC Role / Device Role / Timing Role: Constant-current source regulating red, green, and blue LED strings independently using buck-boost topology to maintain brightness across 9V–16V battery range. Use Value: Enables seamless color blending and 3000:1 dimming without hue shift, meeting OEM requirements for night/day mode transitions. |
Use Scenario: Powering segmented LED backlights in digital dashboards where individual zone dimming improves readability. IC Role / Device Role / Timing Role: Triple-output driver delivering matched current to R/G/B zones with synchronized PWM inputs for uniform grayscale response. Use Value: Eliminates need for three discrete drivers, reducing BOM count and PCB area while ensuring channel-to-channel current matching <±3%. |
| Avionic Display Backlighting | Large-Scale Outdoor Signage |
|
Use Scenario: Illuminating cockpit displays requiring MIL-STD-810G compliance and extended temperature operation. IC Role / Device Role / Timing Role: High-reliability LED driver with –40°C to +125°C rating, open-LED protection, and 40V transient immunity for aircraft power bus interfaces. Use Value: Maintains backlight functionality during voltage spikes and cold-soak conditions, avoiding single-point failure in safety-critical systems. |
Use Scenario: Powering high-brightness LED modules in billboards exposed to solar heating and wide input voltage swings. IC Role / Device Role / Timing Role: Triple-channel buck-mode driver with thermal-aware CTRL pin interface and exposed-pad thermal dissipation for sustained 300mA/channel operation. Use Value: Delivers stable current despite ambient temperatures up to 85°C and input variations from 12V to 28V, minimizing luminance drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3466EFE#TRPBF | Single-channel, 1.5A switch, 3000:1 PWM dimming, same 28-lead TSSOP package but no TG drivers or OVP pins. | Lacks per-channel disconnect capability and open-LED protection - suitable only when driving single LED string with external MOSFET control. | Select LT3466EFE#TRPBF only for cost-sensitive single-string designs where channel independence is unnecessary. |
| MAX20050ATP/V+T | Triple-channel, 600mA switches, 1000:1 PWM dimming, I²C programmable, QFN-24 package, no TG drivers. | Requires external gate drivers for PMOS disconnect and lacks analog CTRL pin flexibility - relies on digital interface for current setting. | Choose MAX20050ATP/V+T when system-level I²C control and diagnostics are prioritized over analog dimming precision and thermal performance. |
Compared with LT3492IFE#TRPBF, LT3466EFE#TRPBF offers higher per-channel current but no multi-channel integration, while MAX20050ATP/V+T provides digital configurability at the expense of analog dimming linearity and thermal robustness in TSSOP packaging.
Availability
LT3492IFE#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, avionic display backlighting, and large-scale outdoor signage requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3492IFE#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 its legacy of high-performance analog ICs for power management, signal conditioning, and timing applications.
The LT3492 product line was designed specifically for high-dimming-ratio, multi-channel LED lighting in automotive, aerospace, and industrial displays - emphasizing thermal resilience, channel independence, and analog control precision.
FAQ
What is the maximum LED string voltage supported by LT3492IFE#TRPBF in boost mode?
The LT3492IFE#TRPBF supports up to 60V at the ISP pins, enabling LED strings with combined forward voltages up to 58V in boost configuration. This is validated in the Typical Application circuit TA01a, where 10 LEDs at ~5.8V total are driven from a 5V input. Operation beyond 58V risks exceeding the 60V absolute maximum rating on ISP/ISN pins.
Can LT3492IFE#TRPBF operate without external P-channel MOSFETs?
Yes, LT3492IFE#TRPBF can operate without external P-channel MOSFETs by leaving TG1–TG3 pins unconnected. In this configuration, PWM dimming still functions by disabling the internal switch, but residual current through the output capacitor may limit dimming ratio below 3000:1. The datasheet explicitly states "TG1 should be left open" when M1 is omitted.
How does the CTRL pin affect LED current accuracy across temperature?
The CTRL pin sets the current sense threshold, and its voltage directly determines LED current via ILED = VCTRL/(10 × RSENSE) when VCTRL < 1V. The LT3492IFE#TRPBF's CTRL input bias current is ±20nA over temperature, contributing <0.1% error to VCTRL - ensuring stable current regulation even at 125°C junction temperature.
What is the purpose of the exposed thermal pad (Pin 29) on LT3492IFE#TRPBF?
The exposed thermal pad (Pin 29) on LT3492IFE#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane with ≥4 thermal vias to achieve θJC = 10°C/W and prevent junction temperature exceedance at full load. Leaving it unsoldered degrades thermal performance by >40°C under typical operating conditions.
Does LT3492IFE#TRPBF support synchronous rectification?
No, LT3492IFE#TRPBF does not support synchronous rectification. It requires an external Schottky diode (e.g., DIODES B1100) in boost and buck-boost configurations, as shown in Figure 1 and Typical Applications TA01a/TA03a. The internal switch is an NPN transistor, and no gate drive signals are provided for a synchronous MOSFET.
LT3492IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- 600mA (Switch)
- Frequency:
- 330kHz ~ 2.1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3492IFE#TRPBF FAQ
1.How can I place an order for LT3492IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3492IFE#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 LT3492IFE#TRPBF reliable?
The price and inventory of LT3492IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3492IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3492IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3492IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3492IFE#TRPBF?
LT3492IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3492IFE#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 LT3492IFE#TRPBF?
For technical support, including LT3492IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3492IFE#TRPBF requirements.
6.How does Aetrix verify that LT3492IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3492IFE#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 LT3492IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3492IFE#TRPBF?
All LT3492IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3492IFE#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 LT3492IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3492IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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