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Analog Devices Inc. LTC3208EUH#TRPBF
- Part No.:
- LTC3208EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3208EUH#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR I2C 1A 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,375
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Product details
Overview
LTC3208EUH#TRPBF from Analog Devices (formerly Linear Technology) is a high-integration, software-configurable multidisplay LED controller featuring a 1x/1.5x/2x charge pump delivering up to 95% efficiency, 1A total output current, and 17 independently programmable current sources for MAIN, SUB, RGB, CAM, and AUX displays. It supports 256 brightness levels for MAIN/SUB, 4096 color combinations for RGB, and operates in a 5mm × 5mm 32-lead QFN package - ideal for space-constrained mobile video/camera phone displays.
For engineers reviewing the LTC3208EUH#TRPBF datasheet, LTC3208EUH#TRPBF pinout, LTC3208EUH#TRPBF application, or LTC3208EUH#TRPBF equivalent, key selection criteria include I²C-programmable LED current sourcing across five display domains, automatic charge pump mode switching based on dropout detection, open/shorted LED protection, thermal shutdown, and precise current matching (±1%) across outputs.
Technical Context
The LTC3208EUH#TRPBF implements a two-phase nonoverlapping 900kHz oscillator driving a switched-capacitor charge pump with automatic mode transitions: it powers up in 1x mode (VBAT → CPO), switches to 1.5x mode (up to 4.5V) upon first LED dropout, then to 2x mode (up to 5.0V) upon subsequent dropout. Mode reset occurs on I²C register update or CAMHL falling edge.
Current control is distributed across five banks: MAIN/SUB use 8-bit linear DACs (0–27.5mA, 256 steps); CAM/AUX use 4-bit linear DACs (0–102.5mA / 0–28.5mA, 16 steps); RGB uses three independent 4-bit exponential DACs (0.24–27.06mA, 16 codes). All currents scale with RREF (22k–30kΩ), referenced to 1.215V internal bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Pump Modes | 1x (direct VBAT), 1.5x (up to 4.53V), 2x (up to 5.02V) - auto-switched on LED dropout to maintain regulation |
| Main/Sub LED Current | 0–27.5mA per channel (8-bit linear DAC, ±1% matching at 50% FS) |
| CAM LED Current | 0–102.5mA per channel (4-bit linear DAC, ±1% matching at 50% FS) |
| RGB LED Current | 0.24–27.06mA per channel (4-bit exponential DAC, 16 discrete brightness codes) |
| I²C Interface | Standard-mode (400kHz), DVCC-referenced SCL/SDA, 7 data registers + address/sub-address logic |
| Operating Temp Range | –40°C to +85°C (E-grade), with guaranteed performance over full range per design correlation |
| Package | 32-lead 5mm × 5mm QFN with exposed GND pad - requires PCB soldering for thermal and electrical integrity |
Pinout & Package
Package: 32-lead (5mm × 5mm) QFN, exposed pad (Pin 33) = GND, must be soldered to PCB ground plane for thermal management and noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CAM1–CAM4 (1–4) | Camera white LED current sources | 4× 0–102.5mA programmable outputs; selectable between high/low 4-bit registers via CAMHL |
| AUX1–AUX4 (5–8) | Auxiliary white LED current sources | 4× 0–26mA outputs; assignable via I²C to CAM/SUB/MAIN DACs for extended current ranges |
| CAMHL (9) | Camera register select input | Logic-high selects CAM high-current register; falling edge resets charge pump to 1x mode |
| SCL/SDA (10/11) | I²C serial interface | DVCC-referenced clock/data lines; support standard-mode (400kHz) communication with microcontroller |
| VBAT1/2/3 (12/24/30) | Power supply inputs | Three isolated VBAT pins reduce noise coupling; all must be externally tied and bypassed (4.7µF + 0.1µF) |
| RREF (13) | Reference current set resistor | 22k–30kΩ to GND sets full-scale current for all DACs; internal reference = 1.215V ±1% |
| DVCC (14) | Digital I/O supply | 1.5–5.5V logic rail; UVLO at 1.0V forces all registers to zero; bypass with 0.1µF capacitor |
| MAIN1–MAIN4 (15–18) | Main display white LED current sources | 4× 0–27.5mA outputs with 8-bit linear DAC; each disableable by connection to CPO |
| SUB1/SUB2 (19/20) | Sub-display white LED current sources | 2× 0–27.5mA outputs with 8-bit linear DAC; same disable mechanism as MAIN |
| RED/GRN/BLUE (21–23) | RGB illuminator current sources | 3× exponential DAC outputs (16 codes, 0.24–27.06mA); also usable as open-drain logic outputs |
| GND (25,33) | System ground | Pins 25 and 33 (exposed pad) must connect to low-impedance ground plane for thermal and EMI control |
| C1P/C1M/C2P/C2M (26/27/29/31) | Flying capacitor connections | Support 2.2µF X7R/X5R ceramic caps for charge pump operation; critical for ripple and efficiency |
| ENRGBS (28) | RGB/SUB enable control | Hardware toggle for RGB or SUB display (configurable via REGG bit G1); avoids I²C wake-up for call alerts |
| CPO (32) | Charge pump output | Regulated output (1x/1.5x/2x) powering all LEDs; requires 4.7µF X5R/X7R ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Automatic charge pump mode switching | Real-time transition between 1x→1.5x→2x based on LED dropout detection - maintains regulation without firmware intervention |
| Integrated open/shorted LED protection | Detects fault conditions on all 17 current outputs and disables affected bank while preserving others - prevents system-level failure |
| Per-bank current source disable | Entire MAIN/SUB/CAM/RGB/AUX banks disabled via zero-data writes; individual outputs disabled by tying to CPO (10µA leakage) |
| Low-noise constant-frequency operation | Fixed 900kHz charge pump clock with flying capacitor edge rate control - minimizes conducted EMI in RF-sensitive mobile designs |
| Thermal and short-circuit protection | Internal thermal shutdown at TJ ≥ 125°C; short-circuit protection on CPO and all current outputs - ensures robustness under fault conditions |
Applications
| Mobile Camera Flash Control | QVGA+ Dual-Display Smartphones |
|---|---|
Use Scenario: Driving high-current white LEDs for camera flash illumination with adjustable intensity and dual-level (high/low) modes. IC Role / Device Role / Timing Role: LTC3208EUH#TRPBF acts as the primary flash LED driver, using CAMHL pin for rapid high/low register switching and 1.5x/2x charge pump modes to sustain >100mA per LED at low battery voltage. Use Value: Enables consistent flash brightness down to 3.1V VBAT via automatic mode boosting, while 16-step CAM DAC and hardware CAMHL control reduce MCU latency during capture. | Use Scenario: Simultaneous backlight control for main QVGA LCD and secondary sub-display (e.g., status bar or caller ID panel). IC Role / Device Role / Timing Role: LTC3208EUH#TRPBF provides independent 8-bit dimming for MAIN (4 channels) and SUB (2 channels), synchronized via single I²C bus without external PWM generators. Use Value: 256 brightness levels per MAIN/SUB channel allow precise luminance matching and power optimization; 1x mode delivers >95% efficiency at nominal VBAT, extending battery life. |
| RGB Status Illumination | Configurable Auxiliary Display Driver |
Use Scenario: Generating dynamic status colors (e.g., charging indicators, notifications) using red/green/blue LEDs on handheld devices. IC Role / Device Role / Timing Role: LTC3208EUH#TRPBF serves as RGB current controller with three independent 4-bit exponential DACs, enabling 4096 color combinations via I²C register writes. Use Value: Exponential DAC response matches human eye perception - smooth visual transitions with minimal code overhead; open-drain capability allows direct logic-level signaling when not driving LEDs. | Use Scenario: Expanding LED count beyond native MAIN/SUB/CAM banks using AUX outputs reassigned to match MAIN or CAM current profiles. IC Role / Device Role / Timing Role: LTC3208EUH#TRPBF configures AUX1–AUX3 as additional MAIN or CAM outputs via I²C, supporting up to 102.5mA per AUX channel when assigned to CAM DAC. Use Value: Eliminates need for external current drivers or second IC - reduces BOM cost and PCB area while maintaining ±1% current matching across all 17 outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multidisplay LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3728-QFLS4-TR | 28-channel, I²C-controlled LED driver with PWM dimming; no integrated charge pump - requires external 5V supply | Designed for general-purpose LED matrix lighting; lacks automatic mode switching and dropout-based protection | Choose when board already has stable 5V rail and higher channel count (>17) is needed; not suitable for battery-powered flash or low-VBAT boost scenarios |
| TPS61165DRVR | Single-output white LED driver with 1.2MHz boost converter; supports only one display domain (no MAIN/SUB/RGB/CAM segmentation) | Targeted at single-display backlighting; no I²C programmability for multiple banks or color mixing | Choose for cost-sensitive single-LED-string applications where multidisplay control and software configurability are unnecessary |
Compared with IS31FL3728-QFLS4-TR and TPS61165DRVR, the LTC3208EUH#TRPBF uniquely integrates charge pump boosting, five independent display domains with mixed DAC types (linear/exponential), and hardware-assisted features (CAMHL, ENRGBS) - making it irreplaceable for compact, battery-operated dual-display mobile systems requiring flash, status, and auxiliary illumination from one IC.
Availability
LTC3208EUH#TRPBF is available at Aetrix Electronics and suitable for mobile phone display backlighting, camera flash modules, RGB status indicators, and auxiliary LED driver applications requiring stable component supply, long-term lifecycle support, and automotive-qualified traceability.
Supply support for LTC3208EUH#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, serving precision instrumentation, communications, and power-constrained portable markets.
The LTC3208EUH#TRPBF belongs to Linear's high-efficiency LED driver product line, designed specifically for space- and power-constrained mobile devices requiring simultaneous control of multiple display types - including main/sub LCD backlights, RGB status lights, and high-current camera flash - with minimal external components.
FAQ
What is the maximum total output current supported by the LTC3208EUH#TRPBF?
The LTC3208EUH#TRPBF supports up to 1A total output current across its 17 current sources. This includes 4× MAIN (27.5mA each), 2× SUB (27.5mA each), 4× CAM (102.5mA each), 3× RGB (27.06mA each), and 4× AUX (28.5mA each when assigned to MAIN/SUB, or 104.9mA when assigned to CAM). Actual concurrent current depends on charge pump mode and thermal limits.
How does the LTC3208EUH#TRPBF handle LED dropout and charge pump mode transitions?
The LTC3208EUH#TRPBF monitors voltage headroom across all enabled current sources. Upon detecting dropout (insufficient voltage to sustain programmed current), it automatically transitions from 1x → 1.5x → 2x mode. Each transition increases CPO voltage (to 4.53V or 5.02V) and resets the pump. Mode reverts to 1x on I²C register update or CAMHL falling edge - ensuring regulation without firmware polling.
Can the AUX outputs of the LTC3208EUH#TRPBF be used for purposes other than LED driving?
Yes - AUX1–AUX3 can be disabled individually by connecting to CPO, and AUX4 can be configured as an open-drain I²C-controlled logic output (not current-sourcing). When used this way, AUX4 functions as a general-purpose digital output, independent of LED current control - enabling flexible signal routing or peripheral enable functions within the same IC.
What is the role of the RREF pin on the LTC3208EUH#TRPBF, and what resistor value should be used?
The RREF pin on the LTC3208EUH#TRPBF sets the full-scale current for all internal DACs via an external resistor to GND. The internal reference is 1.215V ±1%, and RREF must be 22kΩ to 30kΩ. A typical value is 24.3kΩ (1% tolerance), yielding 27.5mA full-scale for MAIN/SUB, 102.5mA for CAM, and 27.06mA max for RGB - scaling all outputs proportionally.
Does the LTC3208EUH#TRPBF support hardware-based display enable/disable without I²C communication?
Yes - the ENRGBS pin provides hardware enable/disable for either the RGB or SUB display (selected via REGG bit G1), allowing instant on/off control without waking the host microcontroller. When ENRGBS is pulled high (DVCC), the selected display activates at its last-programmed current; pulling it low disables that display. If no other displays are active, the entire LTC3208EUH#TRPBF enters shutdown.
LTC3208EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-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:
- 17
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A (Total)
- Frequency:
- 900kHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3208EUH#TRPBF FAQ
1.How can I place an order for LTC3208EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3208EUH#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 LTC3208EUH#TRPBF reliable?
The price and inventory of LTC3208EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3208EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3208EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3208EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3208EUH#TRPBF?
LTC3208EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3208EUH#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 LTC3208EUH#TRPBF?
For technical support, including LTC3208EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3208EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3208EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3208EUH#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 LTC3208EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3208EUH#TRPBF?
All LTC3208EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3208EUH#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 LTC3208EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3208EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3208EUH#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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