My Inquiry
My Account
Analog Devices Inc. LTC3206EUF#TRPBF
- Part No.:
- LTC3206EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3206EUF#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 400MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3206EUF#TRPBF from Analog Devices (formerly Linear Technology) is a highly integrated I²C-controlled multidisplay LED driver IC with fractional charge pump power conversion. It delivers up to 400mA continuous output current, supports independent 16-step exponential dimming for MAIN/SUB white LED displays and 16×16×16 RGB color mixing, and achieves up to 92% efficiency in direct-connect or 1.5× step-up mode. It is used in cellular phones and wireless PDAs to drive main, sub, and RGB indicator displays from a single 2.7V–4.5V supply.
For engineers reviewing the LTC3206EUF#TRPBF datasheet, LTC3206EUF#TRPBF pinout, LTC3206EUF#TRPBF application, or LTC3206EUF#TRPBF equivalent, key selection criteria include its dual-mode charge pump architecture, 1% LED current matching across MAIN/SUB/AUX channels, I²C address 0x36 (0011011), 24-lead 4mm × 4mm QFN package with exposed PGND pad, and support for simultaneous triple-display control without external MOSFETs or inductors.
Technical Context
The LTC3206EUF#TRPBF integrates a constant-frequency, low-noise fractional charge pump with automatic mode switching between 1× direct-connect and 1.5× step-up based on real-time LED dropout detection. Its internal current sources use servo-controlled IMS and IRGB pins (both referenced to 0.6V) to set full-scale currents at 400× the respective sense resistor current.
It implements dual-stage brightness control: exponential DC subranging (25%/50%/100%) combined with 4-bit PWM (0/15 to 15/15) for MAIN/SUB, and linear 4-bit PWM at ~4kHz for RGB. All functions are configured via a write-only I²C interface operating up to 400kHz with fixed 7-bit slave address 0x36.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 4.5V - powers charge pump directly from Li-ion battery or regulated rail without LDO pre-regulation |
| CPO Output Current | 400mA continuous - sufficient to drive up to six 15mA white LEDs or three 20mA RGB LEDs simultaneously |
| LED Current Matching | ±1% - ensures uniform luminance across MAIN1–MAIN4, SUB1–SUB2, and AUX1–AUX2 outputs |
| I²C Address | 0x36 (7-bit) - fixed factory-programmed address enables predictable multi-device bus design |
| Dimming Resolution | 128:1 brightness range for MAIN/SUB - achieved via 16 exponentially spaced steps matching human eye response |
| RGB Color Combinations | 4096 - from independent 16-level PWM per RED/GREEN/BLUE channel, enabling precise status indication |
| Shutdown Current | 7.3µA typical - minimizes battery drain during display-off states in portable devices |
Pinout & Package
Package: 24-lead (4mm × 4mm × 0.75mm) plastic QFN with exposed PGND pad (Pin 25), requiring soldering to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SUB1, SUB2 (1,2) | Current source outputs | Drive up to two white LEDs for sub-display; current set by IMS resistor and scaled 400× |
| C1+, C1−, C2+, C2− (3–6) | Flying capacitor connections | Interface external 2.2µF ceramic capacitors to implement 1×/1.5× charge pump topology |
| DVCC (7), SDA (8), SCL (9) | I²C logic interface supply & signals | Enable communication at DVCC levels from 1.5V to 5.5V; SDA/SCL referenced to DVCC, not VIN |
| ENRGB/S (10) | Hardware enable input | Selectively enables RGB or SUB display via I²C-configurable A2 bit; avoids MCU wake-up for notifications |
| IMS (11), IRGB (12) | Current reference servo inputs | Set full-scale LED current via external resistors; both servo to 0.6V with ±0.015V tolerance over temperature |
| SGND (13), PGND (25) | Signal and power ground | Separate ground returns minimize noise coupling; PGND pad must be soldered for thermal dissipation |
| CPO (14) | Charge pump output | Delivers regulated voltage (up to 4.75V in 1.5× mode) to white/blue/true-green LEDs; requires 2.2µF ceramic bypass |
| VIN (15) | Main supply input | Direct connection to battery; bypassed with 2.2µF ceramic capacitor to suppress high-frequency ripple |
| RED, GREEN, BLUE (16–18) | RGB current source outputs | Individually PWM-dimmed at ~4kHz; each supports 100mA continuous, 125mA pulsed (10% duty) |
| MAIN1–MAIN4 (19–22) | Main display current sources | Drive four white LEDs with identical current matching and exponential dimming; compatible with AUX1/AUX2 assignment |
| AUX1, AUX2 (23,24) | Configurable auxiliary outputs | Programmably assigned to MAIN or SUB display group via I²C; inherit same dimming and current scaling |
Key Features
| Feature | Design Value |
|---|---|
| Automatic 1×/1.5× mode switching | Eliminates manual mode selection; transitions seamlessly at LED dropout threshold to maintain regulation without flicker |
| Exponential MAIN/SUB dimming | 16-step logarithmic scaling matches human photopic response, enabling smooth low-brightness control down to 0.78% |
| Integrated soft-start | Linear 400µs ramp of CPO current prevents inrush-induced supply droop and EMI during mode transitions |
| Low-noise constant-frequency charge pump | 960kHz oscillator minimizes beat frequencies with system clocks; ceramic-only design avoids inductor EMI |
| Independent RGB PWM control | Each color channel controlled by separate 4-bit register, enabling precise white-point tuning and dynamic color effects |
Applications
| Cellular Phone Main Display | Wireless PDA Sub-Display |
|---|---|
Use Scenario: Driving 4× white LEDs for primary LCD backlight in GSM/UMTS handsets with battery voltage sag from 4.2V to 3.2V. IC Role / Device Role / Timing Role: Multichannel LED current controller with adaptive charge pump supplying CPO rail; manages MAIN1–MAIN4 outputs and AUX1/AUX2 as extensions. Use Value: Maintains constant brightness across battery discharge using 1×→1.5× auto-switching and 1% current matching, eliminating visible dimming or color shift. | Use Scenario: Powering dual white LEDs for secondary monochrome display in enterprise PDAs with push-to-talk UI feedback. IC Role / Device Role / Timing Role: Dedicated SUB1/SUB2 current source with hardware ENRGB/S enable for instant notification without waking host processor. Use Value: Enables ultra-low-power standby (7.3µA shutdown) and immediate sub-display activation via single GPIO, reducing system latency and power budget. |
| RGB Status Indicator | Multidisplay Handheld Device |
Use Scenario: Generating programmable status colors (e.g., charging, alert, Bluetooth pairing) using discrete red/green/blue LEDs in compact wearables. IC Role / Device Role / Timing Role: RGB LED driver with independent 4-bit PWM per channel synchronized to internal 4kHz clock derived from 960kHz oscillator. Use Value: Delivers 4096 reproducible colors with <1% current mismatch, enabling accurate brand-color coding and consistent visual feedback across units. | Use Scenario: Simultaneously managing main LCD backlight, secondary OLED sub-display, and RGB notification ring in rugged handheld scanners. IC Role / Device Role / Timing Role: Single-chip triple-display controller coordinating MAIN, SUB, and RGB groups via unified I²C interface and shared charge pump resources. Use Value: Reduces BOM count by replacing three discrete LED drivers and one boost converter, saving >12mm² PCB area and simplifying layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multidisplay LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1570ETL+T | Single 300mA charge pump; supports only MAIN + RGB (no SUB display); I²C address 0x6A; no AUX pin reassignment | Limited to dual-display systems; lacks sub-display current sources and hardware ENRGB/S functionality | Choose when only main + RGB control is needed and board space allows separate SUB driver |
| TPS65136RGTT | Two independent 200mA charge pumps; no integrated I²C dimming; requires external microcontroller for PWM generation | Requires additional MCU firmware overhead and external timing components; no exponential dimming or RGB color mixing | Prefer for designs needing higher per-channel current but accepting increased software complexity and component count |
Compared with MAX1570ETL+T and TPS65136RGTT, the LTC3206EUF#TRPBF uniquely integrates MAIN/SUB/RGB control with hardware-assisted enable, exponential dimming, and automatic charge pump mode switching-reducing firmware dependencies and enabling true triple-display operation in minimal footprint.
Availability
LTC3206EUF#TRPBF is available at Aetrix Electronics and suitable for cellular phones, wireless PDAs, and multidisplay handheld devices requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance over –40°C to +85°C.
Supply support for LTC3206EUF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3206EUF#TRPBF belongs to ADI's precision power management product line, designed specifically for space-constrained portable electronics requiring efficient, integrated LED backlight and indicator control with minimal external components.
FAQ
What is the I²C slave address of the LTC3206EUF#TRPBF?
The LTC3206EUF#TRPBF has a fixed 7-bit I²C slave address of 0x36 (binary 0011011), with the R/W bit always 0 since it is a write-only device. This address is factory-programmed and cannot be changed. The LTC3206EUF#TRPBF responds only to this address on the bus, ensuring deterministic communication in multi-device systems without address conflict risk.
How does the LTC3206EUF#TRPBF handle unused LED output pins?
Unused MAIN, SUB, or AUX LED pins on the LTC3206EUF#TRPBF must be tied to CPO to prevent forced entry into 1.5× charge pump mode. If left floating or grounded, those pins drop out and trigger mode switching even when other displays are off. Connecting to CPO disables the current source while drawing only 10µA test current, preserving efficiency and stability. This requirement applies to all unassigned outputs including MAIN3, MAIN4, AUX1, or AUX2.
What is the maximum continuous current per LED channel on the LTC3206EUF#TRPBF?
The LTC3206EUF#TRPBF supports 100mA continuous current per MAIN1–MAIN4, SUB1–SUB2, AUX1–AUX2, RED, GREEN, and BLUE output pins. This rating is specified under thermal conditions with proper PCB copper pour on the exposed PGND pad. Pulsed operation at 10% duty cycle allows up to 125mA per channel. Exceeding these limits risks thermal shutdown or long-term reliability degradation.
Can the LTC3206EUF#TRPBF drive red LEDs from the CPO output?
Yes, the LTC3206EUF#TRPBF can drive red LEDs from the CPO output, though it is typically optimized for white, blue, and "true" green LEDs. Red LEDs with VF ≤ 2.2V may be powered directly from VIN instead to improve efficiency. When using CPO, ensure the red LED forward voltage plus dropout (≥80mV) does not exceed the CPO regulation voltage (4.75V in 1.5× mode). The LTC3206EUF#TRPBF does not restrict red LED connection to CPO, and its current sources operate identically across all output pins.
What is the purpose of the IMS and IRGB pins on the LTC3206EUF#TRPBF?
The IMS and IRGB pins on the LTC3206EUF#TRPBF are precision servo inputs that set full-scale LED current for white (MAIN/SUB/AUX) and RGB channels respectively. Each pin regulates to 0.6V ±0.015V, allowing current programming via external resistors: ILED = 400 × (0.6V / RIMS) or 400 × (0.6V / RIRGB). This architecture eliminates trimming and provides tight matching across channels, making the LTC3206EUF#TRPBF highly suitable for applications demanding consistent luminance and color fidelity.
LTC3206EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 11
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 400mA
- Frequency:
- 960kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3206EUF#TRPBF FAQ
1.How can I place an order for LTC3206EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3206EUF#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 LTC3206EUF#TRPBF reliable?
The price and inventory of LTC3206EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3206EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3206EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3206EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3206EUF#TRPBF?
LTC3206EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3206EUF#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 LTC3206EUF#TRPBF?
For technical support, including LTC3206EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3206EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3206EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3206EUF#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 LTC3206EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3206EUF#TRPBF?
All LTC3206EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3206EUF#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 LTC3206EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3206EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3206EUF#TRPBF 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…
