My Inquiry
My Account
Analog Devices Inc. LT3498EDDB#TRMPBF
- Part No.:
- LT3498EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3498EDDB#TRMPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,522
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3498EDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a dual-output, 2.3MHz PWM white LED driver and PFM OLED/LCD bias boost converter in a 12-lead 3mm × 2mm DFN package. It integrates two power switches, two Schottky diodes, high-side LED current sensing (200mV), and independent shutdown/dimming control. It drives up to six series white LEDs from 2.5V–12V input while delivering up to 32V at VOUT2 - used in compact dual-display handhelds requiring low-noise, audio-band-free bias generation.
For engineers reviewing the LT3498EDDB#TRMPBF datasheet, LT3498EDDB#TRMPBF pinout, LT3498EDDB#TRMPBF application, or LT3498EDDB#TRMPBF equivalent, key selection criteria include dual-output regulation architecture, 200mV high-side sense tolerance, 27V open-LED protection on CAP1, PFM-controlled OLED output with <30μs max off-time, and verified compatibility with 15μH inductors and X5R/X7R ceramic capacitors in space-constrained designs.
Technical Context
The LT3498EDDB#TRMPBF implements two independent boost topologies: a constant-frequency 2.3MHz current-mode LED driver with high-side sensing and a variable-frequency PFM OLED driver that modulates both peak inductor current and switch off-time to maintain >50kHz minimum switching frequency across load. Each channel includes internal NPN switch, integrated Schottky diode, and dedicated feedback path.
LED regulation uses error amplifier A1 comparing (VCAP1 – VLED1) against a CTRL1-scaled reference (200mV at full scale); OLED regulation employs FB2 with 1.215V internal reference and 182kΩ bottom-resistor, where CTRL2 directly scales output voltage. Open-LED protection clamps CAP1 at 27V, and PMOS disconnect isolates VOUT2 during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 12V - supports single 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 minimizes EMI filtering requirements. |
| LED Current Sense Voltage | 190–210mV (typ 200mV) - defines accuracy of high-side "one-wire" current source; enables ground-referenced LED strings. |
| OLED Driver Feedback Reference | 1.18–1.25V (typ 1.215V) - sets precision output voltage via external resistor divider; internal 182kΩ bottom resistor simplifies design. |
| Max Output Voltage (VOUT2) | 32V - sufficient for driving OLED panels and LCD gate drivers requiring >20V bias rails. |
| Open-LED Protection Threshold | 26–28V (typ 27V) on CAP1 - prevents overvoltage damage during LED string open-circuit failure. |
| Shutdown Supply Current | 8–10μA (VIN = 3V) - ensures ultra-low quiescent consumption in standby mode for battery longevity. |
Pinout & Package
LT3498EDDB#TRMPBF is housed in a 12-lead (3mm × 2mm) plastic DFN package with exposed pad (Pin 13) required to be soldered to PCB ground for thermal and electrical performance. Package height is 1mm - suitable for ultra-thin portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 (Pin 1) | High-side LED string anode connection point | Sense node for (VCAP1 – VLED1); connects to top LED anode and RSENSE1 to GND - enables true one-wire current source topology. |
| CTRL1 (Pin 2) | LED driver dimming/shutdown control | 0–1.5V analog dimming input; <75mV disables LED driver; >125mV enables operation; sets ILED = 200mV / RSENSE1 at full scale. |
| GND1, GND2 (Pins 3, 4) | Power and signal ground return paths | Internally connected; must tie to local low-impedance PCB ground plane - critical for noise immunity and current-sense accuracy. |
| CTRL2 (Pin 5) | OLED driver dimming/shutdown control | 0–1.5V analog control; <75mV disables OLED driver; >125mV enables; scales VOUT2 proportionally to achieve precise bias voltage tuning. |
| FB2 (Pin 6) | OLED output voltage feedback input | Connects to resistor divider from VOUT2; internal 182kΩ to GND; regulates VOUT2 = 1.215V × (1 + RFB2/182kΩ). |
| VOUT2 (Pin 7) | OLED/LCD bias output disconnect node | Drain of internal PMOS disconnect switch; floats to GND when disabled - prevents backfeed into OLED panel during shutdown. |
| CAP2 (Pin 8) | OLED driver output capacitor connection | Connects to cathode of internal Schottky; requires ≥10μF X5R/X7R ceramic bypass to GND for low-noise output. |
| SW2 (Pin 9) | OLED driver power switch collector | Connects to inductor; minimize trace area to reduce EMI radiation from high di/dt switching node. |
| VIN (Pin 10) | Main input supply | 2.5–12V input; requires ≥4.7μF X5R/X7R ceramic bypass close to pin to suppress input ripple and inrush transients. |
| SW1 (Pin 11) | LED driver power switch collector | Connects to LED boost inductor; same EMI-sensitive node as SW2 - keep routing short and away from sensitive analog traces. |
| CAP1 (Pin 12) | LED driver output capacitor connection | Connects to cathode of internal Schottky; requires ≥1μF X5R/X7R ceramic to GND; clamped at 27V during open-LED fault. |
| Exposed Pad (Pin 13) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane - provides primary thermal path and reduces junction-to-board θJA to 160°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost outputs | Enables simultaneous powering of LED backlight and OLED/LCD bias rail from single IC - eliminates need for two discrete converters in dual-display systems. |
| 200mV high-side LED current sense | Allows LED string cathode to connect directly to system ground - simplifies mechanical layout, avoids ground-loop noise, and supports flexible LED placement. |
| PFM OLED driver with non-audible switching | Maintains >50kHz minimum frequency across full load range - eliminates audible coil whine in portable audio-sensitive applications like MP3 players and GPS receivers. |
| Integrated Schottky diodes and power switches | Reduces BOM count by four discrete components per channel; eliminates external diode selection, layout, and thermal management overhead. |
| Open-LED protection (27V clamp) | Prevents destructive overvoltage on CAP1 during LED string open-circuit failure - protects downstream components and improves field reliability. |
| PMOS VOUT2 disconnect | Actively isolates OLED bias rail from output capacitance during shutdown - prevents leakage discharge and enables fast wake-up sequencing. |
Applications
| Cellular Phone Display Power | Handheld PDA Dual-Display Bias |
|---|---|
|
Use Scenario: Powering main LCD backlight (white LEDs) and secondary OLED status display from single Li-Ion cell in slim smartphone form factor. IC Role / Device Role / Timing Role: LT3498EDDB#TRMPBF acts as dual-channel DC-DC controller - LED driver supplies regulated 20mA per string at 16–24V; OLED driver delivers stable 16V bias with <0.5% load regulation. Use Value: Eliminates separate bias ICs; 1mm profile meets Z-height constraints; PFM mode ensures silent operation during voice calls. |
Use Scenario: Driving four-series white LEDs for main screen and generating 18V gate-on voltage for secondary monochrome OLED in ruggedized PDA. IC Role / Device Role / Timing Role: LT3498EDDB#TRMPBF serves as integrated power hub - LED channel operates at 2.3MHz for minimal inductor size; OLED channel uses PFM to sustain efficiency down to 1mA load. Use Value: Reduces solution footprint by 40% vs discrete approach; 27V open-LED protection prevents field failures due to cracked flex cables. |
| Digital Camera Flash & Sensor Bias | GPS Receiver OLED Panel Supply |
|
Use Scenario: Providing programmable LED flash current (up to 200mA peak) and 22V sensor bias voltage in compact digital camera module. IC Role / Device Role / Timing Role: LT3498EDDB#TRMPBF functions as dual-purpose power manager - LED channel supports direct PWM dimming at 100Hz+; OLED channel delivers low-noise 22V with <30μs off-time control. Use Value: Enables synchronized flash/bias timing; integrated Schottky diodes withstand 1A inrush; 12-lead DFN fits 8mm² board area budget. |
Use Scenario: Supplying 15V bias to GPS receiver's OLED information panel while maintaining ultra-low standby current during satellite acquisition pauses. IC Role / Device Role / Timing Role: LT3498EDDB#TRMPBF operates as always-on bias generator - OLED channel maintains regulation at 100μA load; shutdown current ≤10μA extends battery life between location fixes. Use Value: Achieves >85% efficiency at 1mA load; non-audible PFM prevents interference with GPS RF front-end; exposed pad ensures thermal stability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LED/OLED bias applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3260EMS#PBF | Inverting charge pump (not boost); max VOUT = ±15V; no integrated Schottky; 2.5MHz fixed frequency only. | Suitable for low-power OLED bias where input voltage > output voltage; cannot drive LED strings requiring >15V or >20mA. | Select LTC3260EMS#PBF only when bias voltage ≤15V and inverting topology is acceptable; not drop-in for LT3498EDDB#TRMPBF LED-driving function. |
| MAX16832ATP+ | Single-channel LED driver (no OLED output); 40V max output; external MOSFET required; no integrated Schottky or PFM mode. | Requires additional DC-DC stage for OLED bias; higher BOM cost and layout complexity; lacks open-LED protection clamp. | Choose MAX16832ATP+ only for LED-only applications needing >32V output or external FET control; no functional equivalence for dual-rail operation. |
Compared with LTC3260EMS#PBF and MAX16832ATP+, the LT3498EDDB#TRMPBF uniquely combines dual independent boost outputs, integrated Schottky diodes, high-side LED sensing, and PFM-based non-audible OLED regulation - making it the only single-chip solution for space-constrained dual-display devices requiring both LED backlight and high-voltage OLED bias with robust fault protection.
Availability
LT3498EDDB#TRMPBF is available at Aetrix Electronics and suitable for cellular phones, handheld PDAs, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LT3498EDDB#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LT3498 product line was designed specifically for dual-display portable electronics - integrating LED backlight and OLED/LCD bias generation into a single ultra-compact DFN to reduce bill-of-materials, simplify layout, and improve power efficiency in battery-powered handhelds.
FAQ
What is the maximum LED string voltage supported by the LT3498EDDB#TRMPBF?
The LT3498EDDB#TRMPBF supports LED string voltages up to 32V on the CAP1 pin, enabling drive of up to six series white LEDs (typically ~3.2V each) from a 3.6V Li-Ion source. The device includes 27V open-LED protection to clamp CAP1 during fault conditions, preventing overvoltage stress on external components and ensuring safe operation even if the LED string opens.
Does the LT3498EDDB#TRMPBF require external Schottky diodes?
No, the LT3498EDDB#TRMPBF integrates two Schottky diodes - one for the LED driver (CAP1–SW1 path) and one for the OLED driver (CAP2–SW2 path). Each diode supports ≥100mA forward current with ≤800mV forward drop at 100mA, eliminating the need for external diodes and reducing solution size, cost, and layout complexity in dual-display power designs.
How does the LT3498EDDB#TRMPBF achieve "one-wire" LED current sensing?
The LT3498EDDB#TRMPBF achieves "one-wire" LED current sensing using a 200mV high-side sense architecture: the voltage difference between CAP1 and LED1 pins is regulated to 200mV, allowing the LED string cathode to connect directly to system ground. This eliminates the need for a grounded sense resistor and second wire, simplifying mechanical integration and avoiding ground-loop noise in sensitive display systems.
Can the LT3498EDDB#TRMPBF drive both outputs simultaneously?
Yes, the LT3498EDDB#TRMPBF is designed to operate both outputs concurrently - the LED driver (SW1/CAP1) and OLED driver (SW2/CAP2) are fully independent, with separate CTRL1/CTRL2 enable and dimming inputs, dedicated feedback paths (none shared), and isolated power switches. Both channels can be active, shut down, or dimmed independently without cross-regulation or performance degradation.
What is the minimum load requirement for stable operation of the OLED driver in the LT3498EDDB#TRMPBF?
The OLED driver in the LT3498EDDB#TRMPBF requires no external minimum load due to its integrated shunt control block, which automatically injects adaptive current (up to 220μA) when output load falls below ~100μA. This ensures stable regulation and prevents output voltage drift during light-load or standby conditions - critical for OLED panels that draw microamp-level bias current between frames.
LT3498EDDB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT3498EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3498EDDB#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 LT3498EDDB#TRMPBF reliable?
The price and inventory of LT3498EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3498EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3498EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3498EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3498EDDB#TRMPBF?
LT3498EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3498EDDB#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 LT3498EDDB#TRMPBF?
For technical support, including LT3498EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3498EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3498EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3498EDDB#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 LT3498EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3498EDDB#TRMPBF?
All LT3498EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3498EDDB#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 LT3498EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3498EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3498EDDB#TRMPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
