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Analog Devices Inc. LT3497EDDB#TRMPBF
- Part No.:
- LT3497EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3497EDDB#TRMPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 400MA 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3497EDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a dual-channel, high-frequency step-up DC/DC converter IC designed specifically for driving white LED strings in portable electronics. It integrates two independent boost converters, internal Schottky diodes, open-LED protection, and high-side current sensing-enabling true "one-wire" LED string connections. Each channel supports up to 6 LEDs in series (12 total), operates from 2.5V–10V input, and delivers ±5% reference accuracy with 2.3MHz switching.
For engineers reviewing the LT3497EDDB#TRMPBF datasheet, LT3497EDDB#TRMPBF pinout, LT3497EDDB#TRMPBF application, or LT3497EDDB#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed dimming architecture, real-world efficiency data at 3.6V input, and precise alternative part comparisons for Li-ion–powered LED backlighting designs.
Technical Context
The LT3497EDDB#TRMPBF implements two fully independent, constant-frequency (1.8–2.8 MHz, typ. 2.3 MHz) current-mode boost converters sharing only the bandgap reference and oscillator. Each channel features high-side LED current sensing via dedicated CAP/LED differential pairs (VCAP1–VLED1 and VCAP2–VLED2), enabling ground-referenced LED strings without ballast resistors. The control loop uses error amplifiers (A1) comparing sensed voltage against a programmable 200 mV reference modulated by CTRL1/CTRL2.
Each converter includes integrated 300–400 mA switch current limit, 200 mV typical VCE(SAT), 32 V open-circuit output clamping, and Schottky diodes with 0.8 V forward drop at 100 mA. Shutdown occurs when both CTRL pins fall below 50 mV; dimming is achieved via analog voltage (0–1.5 V) or direct PWM applied to CTRL pins, supporting 250:1 true-color PWM dimming per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5 V to 10 V - supports single Li-ion (2.7–4.2 V), dual alkaline (2–3.2 V with auxiliary 3.3 V bias), or 3.3 V system rail operation. |
| Switching Frequency | 1.8–2.8 MHz (typ. 2.3 MHz) - enables use of tiny 10–15 µH inductors and 1 µF ceramic output capacitors, minimizing board area. |
| LED Current Sense Voltage | 200 mV ±5% - sets ILED = 200 mV / RSENSE; enables precise, resistor-programmable current from 2 mA to 20 mA per string. |
| Open-LED Protection | 32 V clamp (typ.) on CAP1/CAP2 - prevents overvoltage damage during LED string disconnection or open-circuit failure. |
| Dimming Interface | Dual independent CTRL1/CTRL2 pins - support analog voltage (0–1.5 V), filtered PWM, or direct PWM (≥80 Hz) for true-color dimming without chromatic shift. |
| Package | 10-pin 3 mm × 2 mm DFN with exposed pad - thermally enhanced for high-efficiency operation in space-constrained handheld PCBs. |
| Operating Temp | –40°C to +85°C - qualified for consumer and industrial portable equipment environments. |
Pinout & Package
LT3497EDDB#TRMPBF is housed in a 10-lead, 3 mm × 2 mm plastic DFN package (DDB) with an exposed thermal pad (Pin 11, GND). The package requires soldering the exposed pad to the PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 (Pin 1) | Anode connection point for first LED string and RSENSE1 | High-side current sense node; referenced to CAP1 to generate 200 mV feedback voltage across RSENSE1. |
| CTRL1 (Pin 2) | Dimming and shutdown control for Converter 1 | 0–1.5 V analog input or PWM signal; <50 mV disables converter; >100 mV enables operation. |
| GND (Pin 3) | Power and signal ground reference | Common return for internal circuitry, exposed pad, and external bypass capacitors. |
| CTRL2 (Pin 4) | Dimming and shutdown control for Converter 2 | Independent of CTRL1; identical function and thresholds for second LED string. |
| LED2 (Pin 5) | Anode connection point for second LED string and RSENSE2 | High-side current sense node for Converter 2; referenced to CAP2. |
| CAP2 (Pin 6) | Output node of Converter 2 | Connects to cathode of internal Schottky diode 2; ties to output capacitor COUT2 and RSENSE2. |
| SW2 (Pin 7) | Power switch drain for Converter 2 | High dv/dt node; must be routed with minimal trace area to reduce EMI and parasitic inductance. |
| VIN (Pin 8) | Main input supply (2.5–10 V) | Requires local 1 µF ceramic bypass capacitor placed adjacent to pin for noise suppression. |
| SW1 (Pin 9) | Power switch drain for Converter 1 | Identical layout requirements as SW2; separate high-frequency switching node. |
| CAP1 (Pin 10) | Output node of Converter 1 | Connects to cathode of internal Schottky diode 1; ties to COUT1 and RSENSE1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost converters | Enables asymmetric LED string configurations (e.g., 4+6 LEDs) and independent brightness control without cross-talk. |
| Integrated Schottky diodes | Eliminates two external diodes per channel, reducing BOM count, footprint, and forward-loss inefficiency. |
| High-side current sensing | Allows LED cathodes to be grounded directly-no need for floating sense resistors or complex routing in tight layouts. |
| 250:1 true-color PWM dimming | Maintains consistent LED chromaticity across full dimming range by avoiding analog current modulation below 1.5 V CTRL. |
| 32 V open-circuit output clamp | Protects downstream components during LED string failure or connector disconnect without external TVS devices. |
| 10-pin 3 mm × 2 mm DFN | Minimizes PCB area while delivering 75–80% peak efficiency at 3.6 V input and 20 mA per 4-LED string. |
Applications
| Smartphone Backlighting | Digital Camera Flash/Backlight |
|---|---|
|
Use Scenario: Driving dual 4-LED strings for main display and front-facing camera LCD backlight in smartphones powered by single Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Dual-channel boost controller providing independent, synchronized PWM dimming with 250:1 range and uniform brightness across displays. Use Value: Eliminates factory calibration and ballast resistors; achieves >75% efficiency at 3.6 V input and 20 mA per string, extending battery life. |
Use Scenario: Powering high-brightness white LED flash arrays (e.g., 2×4 LEDs) and rear-panel OLED backlight in compact digital cameras. IC Role / Device Role / Timing Role: High-frequency (2.3 MHz) dual boost regulator enabling small 10–15 µH inductors and 1 µF ceramics for ultra-thin camera modules. Use Value: Integrated 32 V open-circuit protection prevents flash circuit damage during LED failure; high-side sensing simplifies 1-wire LED interconnect. |
| PDA & Handheld Computer Display | GPS Receiver UI Illumination |
|
Use Scenario: Supplying regulated current to dual segmented LED backlights (e.g., 3+3 LEDs) in ruggedized PDAs operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable current source with ±5% reference accuracy and 200 mV sense voltage, maintaining brightness consistency over full industrial temperature range. Use Value: No external sense resistors required for basic operation; low quiescent current (12–18 µA in shutdown) preserves battery during standby. |
Use Scenario: Illuminating monochrome LCD and button LEDs in automotive-grade GPS receivers powered by 3.3 V system rail or 2xAA batteries. IC Role / Device Role / Timing Role: Dual independent dimming controller supporting mixed-voltage operation (VIN ≥2.5 V) and flexible CTRL pin interfacing (analog/PWM). Use Value: Enables seamless transition between battery and system-supply modes; 2.3 MHz switching avoids audible noise in sensitive navigation audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3220EDHC#TRPBF | Charge-pump topology (no inductors); fixed 2×/3× gain; max 300 mA total output; no integrated Schottky diodes. | Better suited for ultra-low-EMI, inductor-free designs with ≤5 LED strings; lower peak efficiency (~65%) at 3.6 V vs. LT3497's 78%. | Select LTC3220 when board space prohibits inductors and EMI sensitivity precludes switching regulators. |
| TPS61165DRVR | Single-channel boost LED driver; 1.2 MHz switching; external Schottky required; no open-LED clamp; 1.5 A switch current limit. | Requires two ICs for dual-string operation; lacks independent CTRL dimming per channel; needs external overvoltage protection. | Choose TPS61165 only if single-string redundancy or higher per-channel current (>400 mA) is required and dual IC cost/layout is acceptable. |
Compared with LTC3220EDHC#TRPBF and TPS61165DRVR, the LT3497EDDB#TRMPBF uniquely combines dual independent boost channels, integrated Schottky diodes, high-side sensing, and 32 V open-circuit protection in a single 3 mm × 2 mm DFN-making it optimal for compact, high-reliability, dual-display portable LED systems.
Availability
LT3497EDDB#TRMPBF is available at Aetrix Electronics and suitable for smartphone backlighting, digital camera flash modules, PDA display drivers, and GPS receiver UI illumination requiring stable component supply and long-term production continuity.
Supply support for LT3497EDDB#TRMPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision signal chain and power applications.
The LT3497EDDB#TRMPBF belongs to Linear's legacy LED driver product line, engineered specifically for space-constrained, battery-powered portable devices demanding high efficiency, dual independent control, and robust fault protection.
FAQ
What is the maximum number of white LEDs the LT3497EDDB#TRMPBF can drive?
The LT3497EDDB#TRMPBF can drive up to 12 white LEDs total-6 LEDs in series per channel. Each channel operates independently, so asymmetric configurations (e.g., 4 LEDs on Channel 1 and 6 on Channel 2) are fully supported. The IC maintains matched current regulation across both strings using its high-side sense architecture and 200 mV reference voltage.
Does the LT3497EDDB#TRMPBF require external Schottky diodes?
No, the LT3497EDDB#TRMPBF integrates two Schottky diodes-one per boost channel-with a typical forward voltage drop of 0.8 V at 100 mA. This eliminates the need for external diodes, reduces component count, saves PCB area, and improves reliability by removing a common failure point in LED boost circuits.
How does the LT3497EDDB#TRMPBF implement "one-wire" LED connection?
The LT3497EDDB#TRMPBF achieves "one-wire" LED connection via high-side current sensing: the LED string anode connects to LED1/LED2 pins, while the cathode connects directly to ground. The sense voltage (VCAP1–VLED1 or VCAP2–VLED2) is measured across the internal sense path-not a ground-referenced resistor-so only one wire (the anode) needs active routing; the cathode return is shared system ground.
What is the purpose of the exposed pad on the LT3497EDDB#TRMPBF DFN package?
The exposed pad (Pin 11) on the LT3497EDDB#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to ensure proper thermal dissipation (θJA = 76°C/W) and stable operation under load. Omitting this connection risks thermal shutdown and degraded efficiency due to junction temperature rise.
Can the LT3497EDDB#TRMPBF operate from a 2.5 V input supply?
Yes, the LT3497EDDB#TRMPBF is specified to operate down to 2.5 V input, making it compatible with deeply discharged Li-ion cells and dual alkaline battery sources. At 2.5 V, it maintains regulation for shorter LED strings (e.g., 2–3 LEDs per channel) and delivers usable efficiency-verified in typical application circuits TA02a/b and TA12a/b in the official datasheet.
LT3497EDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 10V
- Voltage - Output:
- 35V
- Current - Output / Channel:
- 400mA (Switch)
- Frequency:
- 2.3MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT3497EDDB#TRMPBF FAQ
1.How can I place an order for LT3497EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3497EDDB#TRMPBF 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 LT3497EDDB#TRMPBF reliable?
The price and inventory of LT3497EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3497EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3497EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3497EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3497EDDB#TRMPBF?
LT3497EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3497EDDB#TRMPBF 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 LT3497EDDB#TRMPBF?
For technical support, including LT3497EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3497EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3497EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3497EDDB#TRMPBF 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 LT3497EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3497EDDB#TRMPBF?
All LT3497EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3497EDDB#TRMPBF, 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 LT3497EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3497EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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