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Analog Devices Inc. LTC3208EUH#PBF
- Part No.:
- LTC3208EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3208EUH#PBF.pdf
- Description:
- IC LED DRIVER RGLTR I2C 1A 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,804
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Product details
Overview
LTC3208EUH#PBF from Analog Devices (formerly Linear Technology) is a high-integration, software-configurable multidisplay LED controller with a 1A charge pump power stage. It delivers up to 27.5mA per MAIN/SUB LED, 102mA per CAM LED, and 27mA per RGB channel via I²C-programmable DACs, supporting QVGA+ display systems in mobile handsets. Its automatic 1x/1.5x/2x charge pump mode switching maintains efficiency across varying LED forward voltages.
For engineers reviewing the LTC3208EUH#PBF datasheet, LTC3208EUH#PBF pinout, LTC3208EUH#PBF application, or LTC3208EUH#PBF equivalent, key selection criteria include total output current capability (1A), I²C-controlled 256-level MAIN/SUB dimming, 4096 RGB color combinations, open/shorted LED protection, and thermal shutdown - all in a compact 5mm × 5mm 32-lead QFN package.
Technical Context
The LTC3208EUH#PBF integrates a constant-frequency (0.9 MHz) switched-capacitor charge pump with automatic mode switching: it powers up in 1x mode (VBAT → CPO), transitions to 1.5x mode upon first LED dropout (CPO ≈ 4.5 V), and enters 2x mode upon second dropout (CPO ≈ 5.0 V). Mode reset occurs on I²C register update or CAMHL falling edge.
It features five independent LED driver banks - MAIN (4× 8-bit linear DAC), SUB (2× 8-bit), CAM (4× 4-bit), RGB (3× 4-bit exponential DAC), and AUX (4× 4-bit configurable) - each with programmable ON/OFF, brightness, and assignment logic. All current sources are referenced to a precision 1.215 V internal reference set by an external RREF resistor (22–30 kΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Pump Modes | 1x / 1.5x / 2x auto-switching; enables efficient operation across 2.9–4.5 V input and varying LED VF (e.g., 3.2 V white LED + 180 mV dropout) |
| Main/Sub LED Current | 0–27.5 mA per channel (8-bit linear DAC, 256 steps); supports high-resolution backlight dimming for primary/sub displays |
| CAM LED Current | 0–102.5 mA per channel (4-bit linear DAC, 16 steps); suitable for flash illumination requiring higher peak current |
| RGB LED Current | 0.24–27.06 mA per channel (4-bit exponential DAC, 16 steps); provides perceptually uniform color intensity scaling |
| I²C Interface | Standard-mode (400 kHz) compatible; controls all displays, configuration, and enable states without MCU intervention |
| Package | 5 mm × 5 mm 32-lead QFN with exposed GND pad; supports high thermal dissipation (θJA = 34°C/W) in space-constrained mobile PCBs |
| Operating Temp | –40°C to +85°C ambient; specified performance over full range ensures reliability in handheld consumer environments |
Pinout & Package
Package: 32-lead (5 mm × 5 mm) QFN with exposed thermal pad (Pin 33 = GND, must be soldered to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CAM1–CAM4 (1–4) | Current source outputs for camera white LEDs | Each delivers up to 102.5 mA; selectable between high/low 4-bit registers via CAMHL pin for flash vs. preview modes |
| AUX1–AUX4 (5–8) | Configurable current sources | Can be assigned to CAM, SUB, or MAIN DACs via I²C; AUX4 supports open-drain logic output mode |
| CAMHL (9) | Camera register select input | High = CAM high-current register; low = CAM low-current register; falling edge resets charge pump to 1x mode |
| SCL/SDA (10/11) | I²C clock/data interface | Logic levels referenced to DVCC; supports standard-mode timing (tLOW ≥ 1.3 µs, tHIGH ≥ 0.6 µs) |
| VBAT1/2/3 (12/24/30) | Power supply inputs | Three isolated pins reduce noise coupling; require local 4.7 µF (VBAT2) and 0.1 µF (VBAT3) ceramic bypass capacitors |
| RREF (13) | Reference current setting node | 1.215 V internal reference; external 22–30 kΩ resistor sets full-scale currents for all DAC banks |
| DVCC (14) | Digital I/O supply | 1.5–5.5 V operation; UVLO at 1 V disables all registers; bypass with 0.1 µF capacitor |
| MAIN1–MAIN4 (15–18) | Main display white LED current sources | 8-bit linear control (256 steps), 0–27.5 mA; individual disable via connection to CPO |
| SUB1/SUB2 (19/20) | Sub-display white LED current sources | Same 8-bit/27.5 mA spec as MAIN; independently controllable and disableable |
| RED/GRN/BLUE (21–23) | RGB illuminator current sources | 4-bit exponential DACs; enable perceptually linear color mixing; open-drain logic mode available |
| GND (25, 33) | System ground | Pin 25 and exposed pad (33) must connect to low-impedance ground plane for thermal and noise performance |
| C1P/C1M/C2P/C2M (26/27/29/31) | Flying capacitor connections | Require 2.2 µF X7R/X5R ceramics; define charge pump topology (1x/1.5x/2x) and ripple characteristics |
| ENRGBS (28) | RGB or SUB display enable control | Hardware toggle for active display; configured via REGG bit G1 to control either RGB or SUB bank independently |
| CPO (32) | Charge pump output | Delivers regulated voltage (up to 5.02 V) to all LED anodes; requires 4.7 µF X5R/X7R output capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Auto-switching charge pump | Eliminates manual mode selection; dynamically optimizes efficiency (up to 95%) as LED VF changes during operation |
| 256-step MAIN/SUB dimming | Enables flicker-free, high-resolution brightness control for primary user interface displays |
| 4096 RGB color combinations | Supports rich UI lighting effects using exponential DACs that match human eye luminance perception |
| Open/shorted LED fault detection | Prevents system failure by disabling faulty channels and flagging errors without MCU polling |
| Internal soft-start | Limits inrush current during startup and mode transitions, preventing VBAT droop and supply instability |
| Thermal & short-circuit protection | Shuts down safely at TJ > 125°C or under sustained overcurrent, resuming operation after cooldown |
Applications
| Mobile Video Phone Backlight | Camera Flash Illumination |
|---|---|
Use Scenario: Driving 4-white-LED MAIN display and 2-white-LED SUB display in dual-screen smartphones with QVGA+ resolution. IC Role / Device Role / Timing Role: Multibank LED controller providing independent 8-bit dimming, I²C-configurable timing, and charge-pump power conversion. Use Value: Delivers 27.5 mA per MAIN LED with <1% matching error and 256-step smooth dimming - enabling precise brightness control without visible PWM artifacts. | Use Scenario: Powering 4-white-LED camera flash in compact mobile devices requiring high peak current and fast enable response. IC Role / Device Role / Timing Role: High-current (102.5 mA/channel) LED driver with CAMHL-pin-triggered register switching for flash vs. preview modes. Use Value: Dual 4-bit CAM registers allow instant transition between low-current preview (CAM low) and high-current flash (CAM high) without I²C bus access. |
| RGB Status Indicator | Configurable Auxiliary Lighting |
Use Scenario: Generating dynamic status lighting (e.g., charging, notifications, battery level) using discrete red/green/blue LEDs. IC Role / Device Role / Timing Role: Exponential DAC-based RGB current source with independent 4-bit control per channel and open-drain logic capability. Use Value: 16-step exponential scaling provides perceptually uniform color intensity steps - eliminating visible jumps in brightness across the 0.24–27.06 mA range. | Use Scenario: Repurposing AUX outputs as supplemental lighting or logic-controlled indicators in feature phones or IoT handhelds. IC Role / Device Role / Timing Role: Software-reconfigurable current sources assignable to MAIN, SUB, or CAM DACs via I²C command. Use Value: Enables flexible hardware reuse: AUX1–AUX3 support 27.5 mA when mapped to MAIN/SUB, or 102.5 mA when mapped to CAM - no PCB change required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multidisplay LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165RTVR | Single-output boost LED driver (1.2 A max), no integrated I²C or multi-bank control; requires external MCU for sequencing | Targeted at single-display or monochrome LED systems; lacks MAIN/SUB/CAM/RGB segmentation | Select when only one high-current LED string is needed and system MCU handles all timing/logic |
| ISL97671AIRTZ-T7A | 6-channel WLED driver with 12-bit dimming, but fixed 1.5x boost architecture; no 1x/2x auto-switching or CAMHL pin | Optimized for notebook LCD backlights; lacks flash-specific features (dual CAM registers, high-current flash mode) | Select for high-precision, low-noise notebook backlighting where flash functionality is unnecessary |
Compared with TPS61165RTVR and ISL97671AIRTZ-T7A, the LTC3208EUH#PBF uniquely integrates five independent LED banks, automatic charge pump mode switching, and hardware-accelerated flash control (CAMHL), making it the only solution capable of managing full QVGA+ phone display + camera flash + RGB UI in a single IC.
Availability
LTC3208EUH#PBF is available at Aetrix Electronics and suitable for mobile handset design, camera module integration, and embedded UI lighting applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3208EUH#PBF 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 LTC3208EUH#PBF belongs to ADI's legacy Linear Technology power management portfolio, specifically designed for space-constrained, battery-powered consumer electronics requiring intelligent, multi-display LED control with minimal external components.
FAQ
What is the maximum total output current supported by the LTC3208EUH#PBF?
The LTC3208EUH#PBF supports up to 1A total output current across all enabled LED banks. This includes simultaneous operation of MAIN (4 × 27.5 mA), SUB (2 × 27.5 mA), CAM (4 × 102.5 mA), RGB (3 × 27 mA), and AUX (4 × 26 mA), though practical limits are governed by thermal design and charge pump mode. The datasheet specifies ICPO (charge pump output current) up to 1.3A under pulsed conditions, with 500mA recommended for continuous operation.
How does the LTC3208EUH#PBF handle LED dropout and charge pump mode transitions?
The LTC3208EUH#PBF monitors voltage headroom across its current sources. When any enabled LED channel enters dropout (insufficient voltage to maintain programmed current), it triggers an automatic mode switch: first to 1.5x mode (CPO ≈ 4.5 V), then to 2x mode (CPO ≈ 5.0 V). A falling edge on CAMHL or any I²C register write resets the pump to 1x mode. Dropout detection is per-channel and occurs at ≤180 mV (MAIN/SUB), ≤540 mV (CAM), or ≤140 mV (AUX) dropout voltage.
Can the RGB outputs of the LTC3208EUH#PBF be used as general-purpose logic outputs?
Yes - the RED, GRN, and BLUE pins (21–23) of the LTC3208EUH#PBF can be configured as open-drain logic outputs via I²C command. In this mode, they retain I²C controllability but lose current-source functionality and cannot be disabled by connecting to CPO. Each pin sinks up to 20 mA and operates with DVCC-referenced logic thresholds (VIH ≥ 0.7·DVCC, VIL ≤ 0.3·DVCC), making them suitable for driving small loads or interfacing with other digital circuitry.
What is the role of the RREF pin on the LTC3208EUH#PBF, and what resistor value should be used?
The RREF pin (Pin 13) on the LTC3208EUH#PBF connects to an external resistor to set the reference current for all internal DACs and current sources. It develops a precise 1.215 V internal reference; a 24.3 kΩ ±1% resistor is recommended to achieve nominal full-scale currents (e.g., 27.5 mA MAIN/SUB, 102.5 mA CAM). The datasheet specifies a valid range of 22 kΩ to 30 kΩ - values outside this range may cause DAC nonlinearity or out-of-spec current output.
Does the LTC3208EUH#PBF include built-in protection features, and how do they operate?
Yes - the LTC3208EUH#PBF integrates open/shorted LED detection, thermal shutdown (TJ > 125°C), and short-circuit protection on the CPO output. Open/short detection disables affected channels and asserts no external flag; thermal protection halts operation until junction temperature falls below ~115°C hysteresis; short-circuit protection limits CPO current and triggers automatic recovery. All protections operate autonomously without MCU supervision, ensuring robust field reliability in unattended mobile use cases.
LTC3208EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3208EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3208EUH#PBF 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#PBF reliable?
The price and inventory of LTC3208EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3208EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3208EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3208EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3208EUH#PBF?
LTC3208EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3208EUH#PBF 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#PBF?
For technical support, including LTC3208EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3208EUH#PBF requirements.
6.How does Aetrix verify that LTC3208EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3208EUH#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3208EUH#PBF?
All LTC3208EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3208EUH#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3208EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3208EUH#PBF 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
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