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Analog Devices Inc. LT3003EMSE#TRPBF
- Part No.:
- LT3003EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3003EMSE#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,646
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Product details
Overview
LT3003EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 3-channel LED ballast controller IC that delivers up to 350mA per string with ±3% current matching across channels, enabling uniform brightness in multi-string LED arrays. It operates in buck, boost, and buck-boost topologies with 3V–40V input range and supports true-color PWM dimming up to 3000:1 in buck/boost modes - ideal for TFT LCD backlighting and automotive lighting systems.
For engineers reviewing the LT3003EMSE#TRPBF datasheet, LT3003EMSE#TRPBF pinout, LT3003EMSE#TRPBF application, or LT3003EMSE#TRPBF equivalent, key selection criteria include verified 3-channel current matching accuracy, thermal flag behavior (OT1/OT2 at 125°C), PWM-level-shifting capability without external circuitry, and compatibility with partner drivers like LT3477/LT3476 for mixed-mode operation.
Technical Context
The LT3003EMSE#TRPBF uses a servo-loop architecture where LED2 current serves as the reference for actively regulating LED1 and LED3 currents, achieving ≤±3% matching even with up to 700mV inter-string VLED mismatch. Its internal bias circuit activates when VIN > 3V and SHDN > 0.7V, and PWM control operates with a 0.5V logic-level threshold independent of VEE voltage.
Two open-collector overtemperature outputs (OT1 sinks 100µA, OT2 sinks 300µA) activate at 125°C with 6°C hysteresis, enabling system-level thermal management. The IC enforces zero-current shutdown at 150°C and requires ≥3V headroom between VIN and VEE to maintain regulation - power dissipation is minimized when (VIN – VEE) is held near 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current per Channel | Up to 350mA continuous; internally limited to 550mA max for fault protection. |
| Current Matching Accuracy | ±3% typical across all three strings at 350mA; holds within ±3.5% with 700mV VLED mismatch. |
| PWM Dimming Range | 3000:1 in buck/boost modes at 100Hz; reduced to 2000:1 in buck-boost mode due to SHDN-PWM tie requirement. |
| Input Voltage Range | 3V to 40V operational; absolute max VIN = 40V, LED pins = 48V, VEE = 36V. |
| Overtemperature Threshold | 125°C junction activation for OT1/OT2; 6°C hysteresis ensures stable flag reset at 119°C. |
| Quiescent Current | 10.5mA typical at 100mA load; drops to 470µA in shutdown (SHDN = 0V). |
| Package Thermal Resistance | θJA = 35°C/W with exposed pad soldered to PCB ground plane. |
Pinout & Package
The LT3003EMSE#TRPBF is housed in a thermally enhanced 10-lead MSE (MSOP) package with an exposed pad (Pin 11) that must be soldered to PCB ground for thermal performance. Pin pitch is 0.5mm; total body size is 3.0mm × 3.0mm × 0.86mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 (1) | Controlled current sink for first LED string cathode | Delivers matched current referenced to LED2; max 550mA fault limit. |
| LED2 (2) | Reference current sink for second LED string cathode | Serves as master channel for servo-loop regulation of LED1/LED3. |
| LED3 (3) | Controlled current sink for third LED string cathode | Actively regulated against LED2; same matching spec as LED1. |
| VMAX (4) | Mode-select voltage node | Connected to VOUT in boost/buck-boost; to VIN in buck mode - sets topology. |
| VIN (5) | Main supply rail input | Powers internal control circuitry; requires local 1µF ceramic bypass to GND. |
| PWM (6) | Logic-level dimming control input | 0.5V threshold enables true-color PWM; disconnects all strings when low. |
| OT1 (7) | Open-collector overtemperature flag | Sinks 100µA at 125°C; designed for microprocessor interrupt input. |
| OT2 (8) | Open-collector overtemperature flag | Sinks 300µA at 125°C; intended to defeat gm-error amplifier in partner drivers. |
| SHDN (9) | Micropower enable/disable input | <0.7V shuts down IC; in buck-boost mode, tied to PWM for coordinated control. |
| VEE (10) | Lower rail reference | Ground in boost; inductor node in buck; input supply in buck-boost - defines topology return path. |
| Exposed Pad (11) | Thermal and electrical ground | Must be soldered to solid copper plane; reduces θJA to 35°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| 3-Channel Current Matching | ±3% matching at 350mA ensures consistent luminance across 24-LED arrays (8×3 configuration). |
| Topology Flexibility | Single IC supports buck, boost, and buck-boost via VMAX/VEE pin reconfiguration - eliminates need for multiple driver types. |
| True-Color PWM Dimming | 3000:1 ratio at 100Hz preserves chromaticity; no external level shifters needed due to integrated logic-level interface. |
| Dual Overtemperature Flags | OT1 (100µA) and OT2 (300µA) provide differentiated thermal signaling - one for MCU alert, one for driver disable. |
| Low-Leakage PWM Off-State | VEE/VMAX pin currents drop to nanoamp range ~10µs after PWM edge - critical for high dimming ratios. |
Applications
| TFT LCD Backlighting | Automotive Headlight Modules |
|---|---|
|
Use Scenario: Driving 24 white LEDs (8 per string) in parallel for notebook or monitor backlight with uniform brightness and flicker-free dimming. IC Role / Device Role / Timing Role: Ballast controller providing matched current regulation and synchronized PWM dimming across three independent LED strings. Use Value: Eliminates factory calibration of external ballast resistors and achieves 3000:1 dimming without color shift - meeting display contrast and power efficiency requirements. |
Use Scenario: Powering adaptive front-lighting system (AFS) LED arrays requiring robust thermal management and fail-safe open-circuit detection. IC Role / Device Role / Timing Role: High-reliability current balancer with dual OT flags enabling real-time thermal derating and driver coordination. Use Value: Prevents thermal runaway via 125°C OT activation and forces zero-current state at 150°C - satisfying ASIL-B functional safety expectations. |
| Video Camera Illumination | Heads-Up Display (HUD) Lighting |
|
Use Scenario: Illuminating CMOS image sensors in low-light conditions using compact 3-string LED array with precise intensity control. IC Role / Device Role / Timing Role: Constant-current source with fast PWM response (<2µs turn-on delay) for strobe or video-synchronized lighting. Use Value: Enables frame-accurate dimming control and maintains color fidelity during rapid brightness transitions - critical for broadcast-grade imaging. |
Use Scenario: Backlighting combiner optics in automotive HUDs where space constraints demand minimal footprint and high thermal density handling. IC Role / Device Role / Timing Role: Compact 10-pin MSOP ballast IC delivering 350mA/channel with exposed-pad thermal path for conduction cooling. Use Value: Achieves 81°C junction temperature at 350mA/string with proper layout - enabling reliable operation in confined, high-ambient-temperature HUD enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-channel LED ballast applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3205 | Multi-display fractional charge pump controller with independent current/dimming control; no buck/boost capability; operates from 2.8V–4.5V only. | Targeted at low-voltage portable displays (smartphones, wearables); lacks OT flags and high-current capability. | Select LTC3205 only for battery-powered single-display systems requiring ultra-low input voltage and independent channel dimming. |
| LT3474 | Single-channel 1A step-down LED driver with 400:1 analog/PWM dimming; no current matching or multi-string support. | Requires three separate ICs plus external matching circuitry to replicate LT3003EMSE#TRPBF functionality - higher BOM cost and layout area. | Choose LT3474 only when single-string architecture suffices or when higher per-string current (>350mA) is required without matching constraints. |
Compared with LTC3205 and LT3474, the LT3003EMSE#TRPBF uniquely integrates 3-channel matching, wide-input topology flexibility, and dual thermal flags in a single 10-pin MSE package - reducing system complexity and improving reliability in automotive and industrial backlighting.
Availability
LT3003EMSE#TRPBF is available at Aetrix Electronics and suitable for TFT LCD backlighting, automotive lighting, and heads-up display applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LT3003EMSE#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 legacy Linear parts including the LT3003 series.
The LT3003EMSE#TRPBF belongs to Linear's high-performance LED driver portfolio, engineered specifically for multi-string backlighting and illumination systems demanding precision current matching, wide dimming range, and robust thermal protection.
FAQ
What is the maximum continuous LED current per channel for the LT3003EMSE#TRPBF?
The LT3003EMSE#TRPBF delivers up to 350mA continuous current per LED string under normal operation. Its internal protection limits absolute maximum pin current to 550mA to prevent damage during fault conditions such as shorted LEDs or excessive VLED. This rating assumes proper thermal design with the exposed pad soldered to a PCB ground plane.
Does the LT3003EMSE#TRPBF require external components for PWM dimming control?
No, the LT3003EMSE#TRPBF features integrated level-shifting circuitry on the PWM pin, allowing direct connection of a logic-level (0.5V threshold) signal without external translators or level shifters - even in buck or buck-boost configurations where VEE is not ground. This simplifies system design and improves dimming fidelity.
How does the LT3003EMSE#TRPBF handle LED open-circuit faults?
When any LED string opens, the LT3003EMSE#TRPBF immediately disables current in all three channels - forcing zero output across LED1, LED2, and LED3. This fail-safe behavior prevents overvoltage stress on remaining strings and requires the partner LED driver (e.g., LT3477) to include an overvoltage clamp for full system protection.
What is the purpose of the OT1 and OT2 pins on the LT3003EMSE#TRPBF?
OT1 and OT2 are open-collector overtemperature flags that activate low when the LT3003EMSE#TRPBF junction temperature exceeds 125°C. OT1 sinks 100µA for microprocessor interrupt signaling; OT2 sinks 300µA to directly disable switching regulators by pulling down their gm-error amplifier output - enabling coordinated thermal management.
Can the LT3003EMSE#TRPBF operate in buck-boost mode, and what are the pin connections?
Yes, the LT3003EMSE#TRPBF supports buck-boost operation by connecting VEE to the input supply, VMAX to VOUT, and tying SHDN to PWM. This configuration enables LED strings to return to the input rail instead of ground - useful when input voltage varies above and below LED forward voltage - though PWM dimming ratio is reduced to 2000:1.
LT3003EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 350mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3003EMSE#TRPBF FAQ
1.How can I place an order for LT3003EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3003EMSE#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 LT3003EMSE#TRPBF reliable?
The price and inventory of LT3003EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3003EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3003EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3003EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3003EMSE#TRPBF?
LT3003EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3003EMSE#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 LT3003EMSE#TRPBF?
For technical support, including LT3003EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3003EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3003EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3003EMSE#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 LT3003EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3003EMSE#TRPBF?
All LT3003EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3003EMSE#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 LT3003EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3003EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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