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Analog Devices Inc. LT3497EDDB#TRPBF
- Part No.:
- LT3497EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3497EDDB#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 400MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
LT3497EDDB#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, high-frequency step-up DC/DC converter IC designed specifically to drive two independent white LED strings-up to 6 LEDs in series per channel-from a single Li-Ion cell (2.5V–10V input). It integrates Schottky diodes, open-LED protection (32V clamp), and high-side current sensing for true 1-wire LED connection. Used in compact portable displays requiring uniform brightness and independent dimming.
For engineers reviewing the LT3497EDDB#TRPBF datasheet, LT3497EDDB#TRPBF pinout, LT3497EDDB#TRPBF application, or LT3497EDDB#TRPBF equivalent, key selection criteria include dual independent PWM dimming control (250:1 range), ±5% reference accuracy, 2.3MHz switching frequency enabling <1µF output capacitance per channel, and DFN-10 (3mm × 2mm) thermal performance with exposed pad grounding.
Technical Context
The LT3497EDDB#TRPBF implements two fully independent current-mode boost converters sharing only the bandgap reference and oscillator. Each channel uses constant-frequency (1.8–2.8 MHz) operation with internal 400mA switch current limit and 200mV precision LED current sense voltage (VCAP – VLED), enabling accurate ILED = 200mV / RSENSE programming.
Its high-side sensing architecture eliminates ground-referenced ballast resistors and allows flexible LED string grounding. Open-circuit protection clamps CAP1/CAP2 at 32V (typ), while CTRL1/CTRL2 pins provide independent analog dimming (0–1.5V) and shutdown (<50mV), supporting both filtered-PWM and direct-PWM dimming schemes without color shift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 10V - supports direct Li-Ion (3.0–4.2V), dual-AA (2.0–3.2V via auxiliary supply), or 3.3V logic rail input without pre-regulation. |
| Switching Frequency | 1.8–2.8 MHz (typ 2.3 MHz) - enables use of tiny 10–15µH inductors and 1µF ceramic output capacitors per channel. |
| LED Sense Voltage | 200 mV ±5% - sets precise LED current via external RSENSE; enables ILED = 200mV / RSENSE with 1% resistor for ±1% current accuracy. |
| Open-LED Clamp | 32 V (typ) - protects circuit during LED string disconnection or open failure; prevents overvoltage damage to internal Schottky and external components. |
| Dimming Range | 250:1 true-color PWM - maintains consistent LED chromaticity across full dimming range using direct PWM on CTRL pins. |
| Package Thermal Resistance | θJA = 76°C/W, θJC = 13.5°C/W - requires exposed pad soldered to PCB ground plane for reliable 85°C ambient operation at full load. |
Pinout & Package
LT3497EDDB#TRPBF is housed in a 10-pin 3mm × 2mm plastic DFN package (DDB) with exposed thermal pad (Pin 11, GND). The package supports high-density portable layouts and requires soldering of the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 (Pin 1) | Anode connection point for Channel 1 LED string + RSENSE1 node | High-side current sense input; enables 1-wire LED string topology with cathode grounded anywhere. |
| CTRL1 (Pin 2) | Analog dimming/shutdown control for Channel 1 | 0–1.5V linear control of ILED1; <50mV disables converter; >100mV enables startup. |
| GND (Pin 3) | Power and signal ground reference | Common return for internal circuitry; must be low-impedance connection to PCB ground plane. |
| CTRL2 (Pin 4) | Analog dimming/shutdown control for Channel 2 | Independent control identical to CTRL1; enables asymmetric dimming of dual LED strings. |
| LED2 (Pin 5) | Anode connection point for Channel 2 LED string + RSENSE2 node | High-side sense for second channel; decouples Channel 2 current regulation from Channel 1. |
| CAP2 (Pin 6) | Output node for Channel 2 boost converter | Connects to cathode of internal Schottky diode 2 and output capacitor COUT2. |
| SW2 (Pin 7) | Channel 2 power switch drain | High-frequency switching node; requires minimal trace area to reduce EMI and parasitic inductance. |
| VIN (Pin 8) | Main input supply (2.5–10V) | Must be locally bypassed with ≥1µF ceramic capacitor close to pin for noise suppression. |
| SW1 (Pin 9) | Channel 1 power switch drain | Identical function to SW2; layout symmetry recommended to balance EMI between channels. |
| CAP1 (Pin 10) | Output node for Channel 1 boost converter | Connects to cathode of internal Schottky diode 1 and output capacitor COUT1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost converters | Enables asymmetric LED string configurations (e.g., 4-LED + 6-LED) without cross-talk or shared regulation errors. |
| Integrated Schottky diodes | Eliminates 2 external diodes per channel, reducing BOM count, board area, and forward drop losses (~0.8V @ 100mA). |
| High-side LED current sensing | Allows LED string cathode to connect directly to system ground-no dedicated sense resistor ground path required. |
| 250:1 true-color PWM dimming | Preserves LED chromaticity by switching full current on/off; avoids analog dimming-induced color shift in white LEDs. |
| 32V open-LED protection | Clamps output during LED string open fault, preventing overvoltage stress on internal switches and external capacitors. |
Applications
| Cellular Phone Display Backlight | Digital Camera LCD Backlight |
|---|---|
Use Scenario: Driving dual 4-LED strings for main and secondary LCD panels in slim smartphones with single Li-Ion battery. IC Role / Device Role / Timing Role: Dual-channel white LED driver providing independent brightness control and fault-tolerant operation. Use Value: Enables uniform backlighting across multiple displays with no ballast resistors, reducing component count and calibration cost. | Use Scenario: Powering high-brightness 6-LED string for rear LCD and 4-LED string for viewfinder in compact digital cameras. IC Role / Device Role / Timing Role: Asymmetric boost converter delivering matched current to dissimilar LED counts while maintaining color fidelity. Use Value: 250:1 true-color PWM dimming preserves white point accuracy during video recording and playback modes. |
| GPS Receiver UI Backlight | Portable Media Player Screen |
Use Scenario: Illuminating small monochrome or color UI display in GPS units powered by 2xAA batteries (2.0–3.2V). IC Role / Device Role / Timing Role: Low-input-voltage capable LED driver using auxiliary 3.3V rail for IC bias while inductors run off battery. Use Value: Extends battery life by eliminating intermediate buck conversion; 2.3MHz switching minimizes inductor size in space-constrained enclosures. | Use Scenario: Driving dual 4-LED strings for front-facing screen and status indicator in MP3 players with Li-Ion battery. IC Role / Device Role / Timing Role: Dual independent dimming controller supporting user-selectable brightness levels and automatic shutdown. Use Value: Independent CTRL1/CTRL2 shutdown reduces standby current to 12–18µA, extending idle battery life significantly. |
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 |
|---|---|---|---|
| MAX1910ETE+T | Single-channel, 1.2MHz switching, no integrated Schottky, requires external diodes and ballast resistors. | Limited to symmetric LED strings; lacks independent dimming and open-LED protection. | Choose when cost sensitivity outweighs integration benefits and dual-channel operation is unnecessary. |
| TPS61165DRVR | Single-channel, 1.2MHz, integrated Schottky, but no high-side sensing-requires 2-wire LED connection and ground-referenced sense resistor. | Cannot support 1-wire LED topology; less flexible grounding; lower max LED string voltage (28V vs 32V). | Select for simpler single-string designs where PCB routing constraints allow dedicated sense resistor ground path. |
Compared with MAX1910ETE+T and TPS61165DRVR, the LT3497EDDB#TRPBF delivers true dual-channel independence, integrated protection, and 1-wire flexibility-reducing total solution size by ~35% and eliminating factory calibration for brightness matching.
Availability
LT3497EDDB#TRPBF is available at Aetrix Electronics and suitable for cellular phone backlighting, digital camera displays, GPS receiver UIs, and portable media player screens requiring stable component supply and long-term production continuity.
Supply support for LT3497EDDB#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3497 product line was developed to address space-constrained portable electronics needing efficient, dual independent white LED backlighting with minimal external components and robust fault protection.
FAQ
What is the maximum number of white LEDs the LT3497EDDB#TRPBF can drive per channel?
The LT3497EDDB#TRPBF can drive up to 6 white LEDs in series per channel, for a total of 12 LEDs. This assumes typical white LED forward voltage of ~3.2V each, resulting in ~19.2V output requirement per channel-well within the 32V open-circuit clamp limit. The LT3497EDDB#TRPBF's 2.3MHz switching frequency and integrated Schottky diodes enable efficient operation at these voltages with minimal external components.
Does the LT3497EDDB#TRPBF require external Schottky diodes?
No, the LT3497EDDB#TRPBF integrates two Schottky diodes-one per boost channel-with 0.8V forward drop at 100mA and <4µA reverse leakage at 25V. This eliminates the need for external diodes, reducing bill-of-materials count, PCB area, and forward conduction losses. The LT3497EDDB#TRPBF datasheet confirms internal diode integration in both the Features list and Pin Functions section.
How does the high-side current sensing in the LT3497EDDB#TRPBF simplify LED string layout?
The LT3497EDDB#TRPBF's high-side sensing allows the LED string cathode to connect directly to system ground-eliminating the need for a separate ground-referenced sense resistor path. This enables true "1-wire" LED connection, simplifying routing, avoiding ground loop issues, and supporting flexible mechanical placement of LED arrays. The LT3497EDDB#TRPBF achieves this via dedicated LED1/LED2 pins that serve as high-side sense nodes referenced to CAP1/CAP2.
What dimming methods does the LT3497EDDB#TRPBF support, and how do they differ?
The LT3497EDDB#TRPBF supports three dimming methods: analog (DC voltage on CTRL pins), filtered PWM, and direct PWM. Analog dimming provides smooth 0–1.5V control but may cause color shift; direct PWM preserves chromaticity with 250:1 range and no current modulation. Filtered PWM offers a middle ground. All methods operate independently per channel. The LT3497EDDB#TRPBF's block diagram and Applications Information section confirm dedicated CTRL1/CTRL2 pins enabling this flexibility.
Is the LT3497EDDB#TRPBF compatible with input supplies below 3V, such as two alkaline cells?
Yes-the LT3497EDDB#TRPBF operates down to 2.5V input, making it compatible with two fresh alkaline cells (up to 3.2V) or NiMH (up to 2.8V). Application Note 3497F shows validated 2-AA-to-3/3-LED operation using a 3.3V auxiliary rail for IC bias while inductors run off the battery. The LT3497EDDB#TRPBF's minimum operating voltage is explicitly specified as 2.5V in Absolute Maximum Ratings and Electrical Characteristics tables.
LT3497EDDB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3497EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3497EDDB#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 LT3497EDDB#TRPBF reliable?
The price and inventory of LT3497EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3497EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3497EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3497EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3497EDDB#TRPBF?
LT3497EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3497EDDB#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 LT3497EDDB#TRPBF?
For technical support, including LT3497EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3497EDDB#TRPBF requirements.
6.How does Aetrix verify that LT3497EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3497EDDB#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 LT3497EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3497EDDB#TRPBF?
All LT3497EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3497EDDB#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 LT3497EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3497EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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