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Diodes Incorporated AL3644TTCH12-7
- Part No.:
- AL3644TTCH12-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 12-UFBGA, WLBGA
- Datasheet:
-
AL3644TTCH12-7.pdf
- Description:
- IC LED DRVR RGLTR I2C U-WLB1713
- Quantity:
- Payment:
- Shipping:
Inventory:4,301
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Product details
Overview
AL3644TTCH12-7 from Diodes Incorporated is a dual 1.5A high-side current-source LED flash driver with integrated 2/4MHz synchronous boost converter, I²C interface (0x63), and hardware STROBE/TORCH/TEMP/TX control pins - designed for smartphone camera white LED flash systems requiring precise dual-current regulation, thermal monitoring, and low-battery flash current scaling.
For engineers reviewing the AL3644TTCH12-7 datasheet, AL3644TTCH12-7 pinout, AL3644TTCH12-7 application, or AL3644TTCH12-7 equivalent, this device supports independent 128-step flash/torch current programming (1.4mA–1.5A), adaptive pass/boost mode switching, NTC-based thermal derating, and RF PA synchronization - critical for mobile imaging power management.
Technical Context
The AL3644TTCH12-7 implements a current-mode PWM boost converter with selectable 2MHz or 4MHz fixed-frequency operation, enabling use of 1µH inductors and 10µF ceramic output capacitors. Its dual high-side current sources maintain regulation via VHR headroom voltage (270mV at 360mA torch, 290mV at 729mA flash), dynamically switching between pass mode (pMOS fully on) and boost mode based on VIN–VLED margin.
Control logic integrates I²C register mapping for flash timeout (up to 1.6s), current limit selection (1.9A/2.8A), NTC trip threshold (0.60V), and input voltage flash monitor (2.90V), while hardware pins (STROBE, TORCH/TEMP, TX, HWEN) provide direct system-level timing, thermal response, and PA sync without MCU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Source | Dual independent 1.5A max (flash), 360mA max (torch for AL3644TT variant) |
| Current Resolution | 128-step programmability (1.4mA–1.5A flash; 1.95mA–360mA torch) |
| Switching Frequency | 4MHz typical (±6%), enabling compact 1µH inductor and low-profile layout |
| VHR Headroom Voltage | 270mV at 360mA torch; ensures regulation stability under thermal/voltage drift |
| OVP Threshold | 4.75V typical (4.60–4.85V), protects LED string and internal switches from overvoltage |
| I²C Address | 0x63 (7-bit), 400kHz compatible, supports multi-device addressing in camera modules |
| Operating Temp | −40°C to +85°C ambient, with thermal shutdown at +150°C junction temperature |
| Package | U-WLB1713-12 (1.7mm × 1.3mm, 0.4mm pitch, 12-pin wafer-level BGA) |
Pinout & Package
AL3644TTCH12-7 uses the U-WLB1713-12 wafer-level chip-scale package (1.7mm × 1.3mm, 0.4mm pitch), optimized for ultra-thin mobile camera modules with minimal PCB footprint (<2.36mm² solution size).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | System ground reference; primary thermal path and return for all current sources |
| A2 | IN | 2.5–5.0V input supply; bypassed with ≥10µF ceramic capacitor for boost converter stability |
| A3 | SDA | I²C data line; bidirectional, 400kHz, internal pull-down disabled when active |
| B1 | SW | Switch node connecting internal nMOS/pMOS; drives external 1µH inductor |
| B2 | STROBE | Active-high hardware flash trigger; internal 300kΩ pulldown enables default-off safety |
| B3 | SCL | I²C clock input; synchronizes register writes and status reads |
| C1 | OUT | Boost converter output; supplies regulated voltage to LED anodes via 10µF ceramic cap |
| C2 | HWEN | Hardware enable/reset; low = shutdown/reset, high = standby, internal 300kΩ pulldown |
| C3 | TORCH/TEMP | Dual-function pin: torch enable (active-high) or NTC thermistor input for thermal derating |
| D1 | LED2 | High-side current source output; sinks up to 1.5A to LED2 cathode (grounded-cathode topology) |
| D2 | TX | PA sync interrupt input; high = force torch current during flash, internal 300kΩ pulldown |
| D3 | LED1 | High-side current source output; sinks up to 1.5A to LED1 cathode (independent of LED2) |
Key Features
| Feature | Design Value |
|---|---|
| Grounded-cathode LED drive | Direct thermal coupling to PCB ground plane improves heat dissipation in thin mobile form factors |
| Adaptive pass/boost mode | Eliminates switching loss when VIN > VLED + VHR, boosting efficiency to >85% in torch mode at 100mA |
| Input voltage flash monitor (IVFM) | Reduces flash current automatically below 2.90V VIN to prevent battery brownout during capture |
| NTC thermistor interface | Monitors LED temperature via TORCH/TEMP pin; triggers current scale-back before thermal shutdown |
| RF PA synchronization (TX pin) | Halves flash current during TX pulse events to limit peak battery draw in LTE/5G transmit bursts |
| Hardware strobe & torch enables | Enables camera SoC-triggered flash without I²C latency; supports legacy hardware-only designs |
Applications
| Smartphone Dual-LED Flash | Tablet Camera Module |
|---|---|
|
Use Scenario: Simultaneous white LED flash illumination for rear-facing dual-camera systems during low-light still capture. IC Role / Device Role / Timing Role: Dual high-side current source regulating independent 1.5A flash currents per LED, synchronized to camera shutter via STROBE pin with <1.6s timeout. Use Value: Enables matched brightness and color temperature across dual LEDs while maintaining <2.36mm² PCB area and supporting I²C brightness tuning. |
Use Scenario: Front-facing video call illumination using continuous torch mode with thermal management during extended use. IC Role / Device Role / Timing Role: Torch-mode current source delivering stable 360mA (AL3644TT) to dual LEDs, with NTC monitoring via TORCH/TEMP pin to prevent overheating. Use Value: Sustains consistent illumination for >5 minutes at +40°C ambient without thermal rollback, thanks to grounded-cathode layout and 270mV VHR headroom. |
| Mobile AR Camera Flash | Automotive Cabin Camera |
|
Use Scenario: High-speed IR-assisted flash for augmented reality depth sensing using synchronized LED pulsing. IC Role / Device Role / Timing Role: IR Mode activation (M1/M0=01) with STROBE-controlled on/off toggling, bypassing current ramp for sub-microsecond LED response. Use Value: Achieves precise 100ns–10µs IR pulse widths required for time-of-flight (ToF) sensors, enabled by immediate current transition (no ramp). |
Use Scenario: Driver-monitoring system illumination with fail-safe thermal derating and battery voltage awareness. IC Role / Device Role / Timing Role: Flash driver with IVFM and NTC monitoring, operating across −40°C to +85°C ambient, with OVP protecting against load-dump transients. Use Value: Maintains functional illumination down to 2.5V battery voltage and disables flash above 4.85V to prevent LED overvoltage in 12V automotive systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-side LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3645TTCH12-7 | Same pinout/package; adds programmable 12-bit current DAC resolution (vs. 7-bit flash/6-bit torch on AL3644TT) | Higher precision needed for color-balanced dual-LED flash in premium smartphones | Select AL3645TT for tighter current matching (<±1%) and finer brightness gradation in flagship devices |
| RT8546GQW | Single-output 2A flash driver; no dual-current independence, no NTC monitoring, no TX sync pin | Cost-sensitive single-LED applications where thermal/PA sync features are unnecessary | Choose RT8546GQW only for basic flash functionality without dual-LED coordination or thermal safety |
Compared with AL3645TTCH12-7, the AL3644TTCH12-7 offers lower cost and sufficient 128-step resolution for mainstream smartphones, while RT8546GQW lacks the dual-channel control, thermal monitoring, and RF sync essential for modern dual-LED camera systems.
Availability
AL3644TTCH12-7 is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and automotive cabin monitoring systems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for AL3644TTCH12-7 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AL3644 belongs to Diodes' camera LED driver product line, engineered specifically for space-constrained mobile imaging systems requiring high-efficiency dual-flash control, thermal safety, and hardware-software co-design flexibility.
FAQ
What is the maximum continuous torch current supported by AL3644TTCH12-7?
The AL3644TTCH12-7 supports up to 360mA per channel in torch mode, verified at 25°C ambient with 10µF output capacitance and 1µH inductor. This rating is maintained across −40°C to +85°C ambient when using the NTC thermistor interface on TORCH/TEMP to scale current below +60°C junction temperature.
How does the TX pin affect flash operation during RF transmission?
When TX is pulled high during a flash event, the AL3644TTCH12-7 immediately reduces LED current to the programmed torch level (e.g., 360mA) to limit peak battery current. If TX returns low before timeout, flash resumes at the original 1.5A level; otherwise, flash terminates normally after timeout.
Can AL3644TTCH12-7 operate without I²C configuration?
Yes - hardware pins (STROBE, TORCH/TEMP, HWEN) enable basic flash/torch operation without I²C. Default flash current is 1.5A (code 0x7F), torch is 360mA (code 0x3F), and timeout is 1.6s. I²C is required only for custom current levels, timing, or status monitoring.
What is the minimum input voltage required for flash mode operation?
The AL3644TTCH12-7 requires ≥2.5V input for flash mode, enforced by undervoltage lockout (UVLO) with 2.6V typical turn-on threshold. Below 2.5V, the device disables flash output and asserts UVLO flag via I²C status register to prevent unstable operation.
AL3644TTCH12-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 12-UFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A (Flash)
- Frequency:
- 4MHz
- Dimming:
- I2C, PWM
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-WLB1713-12
AL3644TTCH12-7 FAQ
1.How can I place an order for AL3644TTCH12-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL3644TTCH12-7 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 AL3644TTCH12-7 reliable?
The price and inventory of AL3644TTCH12-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL3644TTCH12-7 is usually 5 days.
3.What payment methods are accepted for AL3644TTCH12-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL3644TTCH12-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL3644TTCH12-7?
AL3644TTCH12-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL3644TTCH12-7 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 AL3644TTCH12-7?
For technical support, including AL3644TTCH12-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL3644TTCH12-7 requirements.
6.How does Aetrix verify that AL3644TTCH12-7 is sourced from the original manufacturer or authorized distributors?
All AL3644TTCH12-7 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 AL3644TTCH12-7 meets industry standards.
7.What is the process for return or replacement of AL3644TTCH12-7?
All AL3644TTCH12-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL3644TTCH12-7, 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 AL3644TTCH12-7 part is unused and in its original packaging.
Return procedure for AL3644TTCH12-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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