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Analog Devices Inc. LT3498EDDB#TRPBF
- Part No.:
- LT3498EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3498EDDB#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
LT3498EDDB#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output DC/DC boost converter IC designed for driving white LED strings and powering OLED/LCD bias rails in portable electronics. It integrates two independent switching regulators: a 2.3MHz PWM-controlled LED driver with high-side current sensing (200mV sense voltage) and a PFM-based low-noise OLED driver with 1.215V feedback reference, both featuring internal power switches and Schottky diodes in a 12-lead 3mm × 2mm DFN package.
For engineers reviewing the LT3498EDDB#TRPBF datasheet, LT3498EDDB#TRPBF pinout, LT3498EDDB#TRPBF application, or LT3498EDDB#TRPBF equivalent, key selection considerations include dual-rail output capability (up to 32V), independent dimming/shutdown control via CTRL1/CTRL2, open-LED protection (27V clamp), and compatibility with Li-Ion input (2.5V–12V) in space-constrained handheld devices.
Technical Context
The LT3498EDDB#TRPBF implements two distinct regulation architectures: the LED driver uses constant-frequency current-mode PWM control with 2.3MHz switching and high-side 200mV current-sense, enabling true "one-wire" LED string connection; the OLED driver employs variable-frequency PFM control that modulates both peak inductor current and switch off-time to maintain >50kHz minimum frequency across load range while minimizing output ripple.
Both channels feature integrated NPN power switches (300–425mA LED switch limit, 180–400mA OLED switch limit), internal Schottky diodes (0.8V forward drop at 100mA), and dedicated protection functions-open-LED clamping on CAP1 (27V typ), PMOS output disconnect on VOUT2, and independent shutdown thresholds (75mV on CTRL1/CTRL2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 12V - supports single-cell Li-Ion (3.0–4.2V) and multi-cell battery inputs without external LDO pre-regulation. |
| LED Driver Switching Frequency | 1.8–2.8MHz (typ 2.3MHz) - enables use of small 15μH inductors and ceramic capacitors; avoids audible noise and simplifies EMI filtering. |
| OLED Driver Feedback Reference | 1.215V ±0.035V - sets precise output voltage via external resistor divider; internal 182kΩ bottom resistor reduces component count. |
| LED Current Sense Voltage | 200mV ±10mV - enables accurate, temperature-stable LED current regulation independent of ground path routing. |
| Max Output Voltage | 32V - sufficient to drive six-series white LEDs (~18–22V) and OLED bias rails (12–16V) from low-input sources. |
| Shutdown Threshold | 75mV on CTRL1/CTRL2 - ensures robust disable margin against noise; 125mV turn-on threshold provides hysteresis. |
| Package | 12-lead 3mm × 2mm DFN with exposed pad - 1mm profile enables ultra-thin portable designs; thermal pad must be soldered for junction temp control. |
Pinout & Package
LT3498EDDB#TRPBF is housed in a 12-lead plastic DFN (DDB) package measuring 3mm × 2mm × 1mm with an exposed thermal pad (Pin 13) that must be soldered to PCB ground for thermal management and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 (1) | High-side LED string anode connection | Completes current-sense loop with CAP1; enables ground-referenced LED string layout ("one-wire" topology). |
| CTRL1 (2) | LED driver dimming/shutdown control | Analog dimming input (0–1.5V) or PWM interface; <75mV disables LED driver, >125mV enables operation. |
| GND1, GND2 (3,4) | Power ground terminals | Internally connected; separate pins reduce ground bounce between LED and OLED sections. |
| CTRL2 (5) | OLED driver dimming/shutdown control | Adjusts OLED output voltage level; <75mV disables OLED regulator, >125mV enables regulation. |
| FB2 (6) | OLED feedback input | Monitors VOUT2 via resistor divider; internal 182kΩ pull-down enables single-resistor programming of output voltage. |
| VOUT2 (7) | OLED output disconnect drain | PMOS switch output; goes to ground during shutdown, isolating OLED load from bias rail. |
| CAP2 (8) | OLED driver output node | Connects to cathode of internal Schottky; requires local 10μF ceramic bypass capacitor to GND. |
| SW2 (9) | OLED power switch collector | High-di/dt node; requires minimized trace area to suppress EMI from PFM switching transitions. |
| VIN (10) | Main input supply | Accepts 2.5–12V; requires 4.7μF local ceramic bypass capacitor to handle pulsed input current. |
| SW1 (11) | LED power switch collector | High-frequency PWM node; trace minimization critical for EMI control at 2.3MHz. |
| CAP1 (12) | LED driver output node | Connects to Schottky cathode and LED string; includes 27V overvoltage clamp for open-LED fault protection. |
| Exposed Pad (13) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation (θJA = 160°C/W) and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost regulators | Enables simultaneous powering of LED backlight and OLED display bias from single Li-Ion source without cross-regulation interference. |
| High-side LED current sensing (200mV) | Eliminates need for ground-return path in LED string, simplifying mechanical layout and improving noise immunity in shared-ground systems. |
| PFM OLED control with audio-band avoidance | Maintains >50kHz minimum switching frequency across full load range, preventing audible coil whine in sensitive portable audio applications. |
| Integrated Schottky diodes & power switches | Reduces BOM count by 4 discrete components per channel; eliminates external diode selection and layout sensitivity. |
| Open-LED protection with 27V clamp | Prevents destructive overvoltage on CAP1 during LED string open-circuit faults, enabling robust field reliability without external TVS. |
| PMOS output disconnect on VOUT2 | Actively isolates OLED load from bias rail during shutdown, eliminating leakage current and enabling true zero-power display off-state. |
Applications
| Smartphone Display Power | Portable Media Player UI |
|---|---|
Use Scenario: Dual-display smartphone with AMOLED main screen and secondary OLED status panel. IC Role / Device Role / Timing Role: LT3498EDDB#TRPBF provides regulated 16V OLED bias (VOUT2) and 24V LED backlight (CAP1) from 3.6V Li-Ion battery. Use Value: Independent CTRL1/CTRL2 dimming allows synchronized brightness control across displays while maintaining color fidelity via PWM-free analog dimming on LED channel. | Use Scenario: MP3 player with white LED-backlit LCD menu and monochrome OLED album art display. IC Role / Device Role / Timing Role: LT3498EDDB#TRPBF drives 4-series white LEDs (20mA) and generates 12V OLED bias with <0.5% load regulation. Use Value: Integrated Schottky diodes and 1mm-profile DFN enable <1.5mm total solution height, meeting ultra-thin industrial design targets. |
| Handheld GPS Receiver | Digital Camera Backlight |
Use Scenario: Outdoor GPS unit requiring sunlight-readable transflective LCD and low-power OLED compass overlay. IC Role / Device Role / Timing Role: LT3498EDDB#TRPBF supplies 18V LCD bias (VOUT2) and 22V LED backlight (CAP1) with independent shutdown for power gating. Use Value: 75mV shutdown threshold ensures reliable disable under noisy automotive electrical environments, preventing false turn-on during cold cranking. | Use Scenario: Compact digital camera with auto-focus assist LED array and OLED viewfinder. IC Role / Device Role / Timing Role: LT3498EDDB#TRPBF delivers 200mA pulsed LED current (via CTRL1 PWM) and stable 14V OLED bias (FB2-regulated). Use Value: 2.3MHz LED switching enables <10μs LED current settling time, supporting high-speed flash synchronization without visible flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3260EMS#TRPBF | Single-output inverting charge pump (±2.5V to ±20V); no integrated switches or Schottky diodes; requires external flying capacitors. | Suitable only for low-current bias rails (<100mA); cannot drive LED strings directly due to lack of current regulation. | Select when needing negative/positive dual-rail bias without LED driving; not a functional replacement for LT3498EDDB#TRPBF's dual-boost architecture. |
| TPS61165DRVR | Single-output 1.2MHz boost LED driver; no OLED/PFM channel; 40V max output; external Schottky required. | Supports only LED backlighting; lacks independent OLED bias generation, open-LED protection, and high-side sensing. | Choose for cost-sensitive LED-only applications where dual-rail functionality is unnecessary and board space permits external diode placement. |
Compared with LTC3260EMS#TRPBF and TPS61165DRVR, the LT3498EDDB#TRPBF uniquely integrates two functionally distinct boost regulators (PWM LED + PFM OLED) with matched protection features, enabling compact dual-display power solutions impossible with single-channel alternatives.
Availability
LT3498EDDB#TRPBF is available at Aetrix Electronics and suitable for smartphone display power, portable media player UI, handheld GPS receiver, and digital camera backlight applications requiring stable component supply, lead-free compliance, and tape-and-reel packaging for automated assembly.
Supply support for LT3498EDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision instrumentation, industrial automation, and portable electronics.
The LT3498 product line was developed specifically for space-constrained dual-display portable devices, integrating LED backlight and OLED/LCD bias generation into a single 3mm × 2mm footprint to eliminate discrete power stage complexity.
FAQ
What is the maximum LED string voltage supported by the LT3498EDDB#TRPBF?
The LT3498EDDB#TRPBF supports up to 32V on its CAP1 pin, enabling it to drive six-series white LEDs (typically 3.0–3.6V each, totaling ~18–22V) with sufficient headroom for input voltage droop and dynamic load transients. This rating is confirmed in the Absolute Maximum Ratings table and validated by typical application circuits showing 24V output with 3.6V input.
How does the LT3498EDDB#TRPBF achieve "one-wire" LED current sensing?
The LT3498EDDB#TRPBF achieves "one-wire" LED current sensing through its high-side 200mV current-sense architecture: the LED string anode connects to LED1 pin, while the cathode connects to system ground. The voltage difference between CAP1 and LED1 is regulated to 200mV, allowing the LED string to be grounded anywhere without requiring a dedicated sense resistor return path.
Can the LT3498EDDB#TRPBF drive both LED and OLED loads simultaneously?
Yes, the LT3498EDDB#TRPBF is explicitly designed for simultaneous dual-load operation: its independent PWM LED driver (CAP1/SW1/LED1) and PFM OLED driver (VOUT2/CAP2/SW2) operate concurrently with no shared control loops or cross-regulation. Typical application schematics demonstrate concurrent 16V OLED bias and 24V LED backlight generation from a single 3.6V input.
What protection features does the LT3498EDDB#TRPBF include for open-circuit LED faults?
The LT3498EDDB#TRPBF includes dedicated open-LED protection on its CAP1 pin, clamping voltage to 27V (typical) when the LED string opens. During this fault condition, the LED driver reduces switching frequency to minimize input current draw, as verified in Typical Performance Characteristic graph 3498 G08 and described in the Applications Information section.
Is the LT3498EDDB#TRPBF compatible with standard 0.5mm-pitch pick-and-place equipment?
Yes, the LT3498EDDB#TRPBF's 12-lead 3mm × 2mm DFN package has 0.5mm pin pitch and meets IPC-7351B standards for surface-mount assembly. Its exposed thermal pad (Pin 13) is designed for standard reflow profiles, and the device is supplied in EIA-481-compliant tape-and-reel format (TRPBF suffix) for automated placement.
LT3498EDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 12V
- Voltage - Output:
- 32V
- Current - Output / Channel:
- 20mA
- Frequency:
- 2.3MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x2)
LT3498EDDB#TRPBF FAQ
1.How can I place an order for LT3498EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3498EDDB#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 LT3498EDDB#TRPBF reliable?
The price and inventory of LT3498EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3498EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3498EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3498EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3498EDDB#TRPBF?
LT3498EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3498EDDB#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 LT3498EDDB#TRPBF?
For technical support, including LT3498EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3498EDDB#TRPBF requirements.
6.How does Aetrix verify that LT3498EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3498EDDB#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 LT3498EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3498EDDB#TRPBF?
All LT3498EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3498EDDB#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 LT3498EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3498EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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