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Diodes Incorporated AL3644CH12-7
- Part No.:
- AL3644CH12-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 12-UFBGA, WLBGA
- Datasheet:
-
AL3644CH12-7.pdf
- Description:
- IC LED DRVR RGLTR I2C U-WLB1713
- Quantity:
- Payment:
- Shipping:
Inventory:2,890
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Product details
Overview
AL3644CH12-7 from Diodes Incorporated is a dual 1.5A synchronous boost LED flash driver IC for smartphone camera modules, featuring I²C-controlled 128-step current programming (1.4mA–1.5A per channel), 2MHz/4MHz switching, overvoltage protection (4.75V), and grounded-cathode LED topology for thermal efficiency in compact mobile designs.
For engineers reviewing the AL3644CH12-7 datasheet, AL3644CH12-7 pinout, AL3644CH12-7 application, or AL3644CH12-7 equivalent, this page delivers verified electrical specs, hardware interface behavior (STROBE/TORCH/TEMP/TX), thermal regulation logic, and real-world torch/flash timing constraints - all validated against Diodes DS41558 Rev. 2.
Technical Context
The AL3644CH12-7 integrates a fixed-frequency (2/4 MHz) current-mode synchronous boost converter with dual high-side current sources, each regulated to maintain ≥290mV headroom (VHR) across LED loads. Its adaptive pass/boost mode transition ensures >85% efficiency at 100mA torch and 1A–1.5A flash currents.
Hardware control pins include STROBE (active-high flash enable), TORCH/TEMP (dual-function torch enable + NTC thermistor input), TX (PA sync interrupt), and HWEN (reset/standby). All digital interfaces use 400kHz I²C (address 0x63) with register-based flash timeout (up to 1.6s), current scaling, and fault flag reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Range | 1.4mA–1.5A per channel (128 programmable steps); enables precise brightness matching between dual flash LEDs. |
| Switching Frequency | 3.76–4.24MHz (typ. 4MHz); allows use of 1µH inductors and 10µF ceramic caps for ultra-compact layout. |
| VHR Regulation Voltage | 290mV (at 729mA flash); minimum headroom required to keep both current sources in regulation under load. |
| OVP Threshold | 4.60–4.85V; protects output stage from overvoltage during boost transients or LED open-circuit faults. |
| Input Voltage Range | 2.5V–5.0V; supports direct connection to single-cell Li-ion batteries with dynamic IVFM-based current scaling. |
| Torch Efficiency | >85% at 100mA; minimizes thermal dissipation during extended video recording illumination. |
| Thermal Shutdown | +150°C junction limit; internal thermal monitor disables outputs to prevent damage during sustained high-current operation. |
Pinout & Package
Package: U-WLB1713-12 (1.7mm × 1.3mm, 0.4mm pitch, 12-pin wafer-level chip-scale package).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Power ground reference; must be low-impedance connection to PCB ground plane for thermal and noise control. |
| A2 | IN | Main power input (2.5–5V); requires ≥10µF ceramic bypass capacitor to GND for stable boost operation. |
| A3 | SDA | I²C data line (open-drain, 400kHz); bidirectional communication with host controller for register read/write. |
| B1 | SW | Internal switch node; connects to external 1µH inductor and feeds DC-DC boost stage. |
| B2 | STROBE | Active-high hardware flash trigger; internal 300kΩ pulldown ensures safe default-off state. |
| B3 | SCL | I²C clock input (open-drain); synchronizes data transfers with host microcontroller or baseband processor. |
| C1 | OUT | Boost converter output; supplies regulated voltage to LED current sources via 10µF ceramic capacitor to GND. |
| C2 | HWEN | Hardware enable/reset; low = shutdown/reset, high = standby; internal 300kΩ pulldown prevents floating state. |
| C3 | TORCH/TEMP | Dual-function pin: active-high torch enable OR NTC thermistor input for thermal current scaling (0.6V trip threshold). |
| D1 | LED2 | High-side current source output; drives second white LED with independent 128-step current programming. |
| D2 | TX | PA synchronization input; high pulse forces immediate transition from flash to torch current to reduce battery peak demand. |
| D3 | LED1 | High-side current source output; drives primary white LED with identical current accuracy and regulation as LED2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1.5A current sources | Enables matched illumination from two physically separated LEDs without external current-sense resistors or op-amps. |
| Grounded-cathode LED operation | Places LED cathodes on PCB ground plane, improving thermal conduction and reducing board-level EMI vs. high-side cathode layouts. |
| Adaptive pass/boost mode switching | Automatically transitions to pass mode when VIN > VLED + VHR, eliminating switching losses and boosting efficiency at higher input voltages. |
| Input voltage flash monitor (IVFM) | Dynamically scales flash current downward when VIN drops below 2.9V, preventing brownout-induced system instability during battery discharge. |
| NTC thermistor monitoring | Uses TORCH/TEMP pin to detect LED temperature rise and scale back current before thermal runaway occurs - no external ADC required. |
Applications
| Smartphone Dual-LED Flash | Tablet Camera Illumination |
|---|---|
|
Use Scenario: Simultaneous high-intensity illumination from two spatially separated white LEDs during still-image capture in low-light conditions. IC Role / Device Role / Timing Role: Dual 1.5A current source driver with hardware STROBE-triggered flash timing and I²C-programmed current ratio control for color/brightness matching. Use Value: Delivers 1.5A per LED with <±7% accuracy and <1.6s timeout, enabling consistent exposure while avoiding battery voltage sag during burst capture. |
Use Scenario: Extended-duration torch mode for video recording under dim ambient lighting in 10-inch tablets. IC Role / Device Role / Timing Role: High-efficiency (>85%) constant-current driver with programmable 179mA/360mA torch levels and thermal derating via NTC feedback. Use Value: Maintains stable LED brightness over temperature and battery voltage range while limiting junction temperature to ≤125°C during 5+ minute recordings. |
| Mobile Barcode Scanner | AR Glasses Illumination |
|
Use Scenario: Short-duration, high-current LED pulses synchronized to CMOS image sensor integration time for rapid barcode decoding. IC Role / Device Role / Timing Role: Hardware-triggered (TX-synchronized) flash driver with sub-millisecond current ramp-up and programmable flash timeout. Use Value: Reduces flash duration jitter to <100ns via STROBE edge triggering and eliminates PA interference using TX-driven current foldback. |
Use Scenario: Low-profile, thermally constrained near-eye illumination for monochrome micro-LED arrays in lightweight AR glasses. IC Role / Device Role / Timing Role: Ultra-compact WLCSP driver supporting grounded-cathode LED mounting and IR mode for strobed invisible illumination. Use Value: Achieves <2.36mm² solution size with 1µH inductor and 10µF caps, meeting strict mechanical envelope and thermal dissipation limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-current LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8547GQW | Single-channel 2A flash driver; lacks dual independent current sources and NTC monitoring. | Requires external current-matching circuitry for dual-LED systems; no thermal foldback capability. | Choose only if single-LED design suffices and thermal management is handled externally. |
| ISL97642IRTZ-T7A | Quad 400mA driver with 1.2MHz switching; lower per-channel current and no TX sync pin. | Supports four LEDs but cannot deliver 1.5A per channel; unsuitable for high-lumen smartphone flash. | Select when multi-LED (≥3) illumination is needed at lower current density and without PA synchronization. |
Compared with RT8547GQW and ISL97642IRTZ-T7A, the AL3644CH12-7 uniquely combines dual 1.5A sourcing, hardware TX synchronization, and integrated NTC monitoring in a 1.7×1.3mm WLCSP - making it the only option for thermally robust, PA-coordinated dual-flash in space-constrained mobile cameras.
Availability
AL3644CH12-7 is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and AR wearable illumination requiring stable component supply, full RoHS/Green compliance, and automotive-grade change control readiness.
Supply support for AL3644CH12-7 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 AL3644CH12-7 belongs to Diodes' camera LED driver product line, engineered specifically for high-efficiency, thermally optimized dual-flash illumination in battery-powered mobile devices with stringent size and EMI constraints.
FAQ
What is the function of the TORCH/TEMP pin?
The TORCH/TEMP pin serves two distinct roles: when configured for torch mode, it acts as an active-high enable signal; when configured for thermal monitoring, it accepts voltage from an external NTC thermistor and triggers current scaling when the comparator trips at 0.60V (±5%). Internal logic automatically selects mode based on register settings - no external switching components are required.
How does the AL3644CH12-7 handle low-input-voltage conditions during flash?
The AL3644CH12-7 uses its Input Voltage Flash Monitor (IVFM) feature to dynamically reduce flash current when VIN falls below 2.9V (±3%). This threshold is set via Register 0x02 bits[5:3] and prevents system brownout by lowering LED current before battery voltage collapses, maintaining stable baseband processor operation during burst capture sequences.
Can the AL3644CH12-7 drive LEDs in pass mode only?
Yes - when VIN exceeds VLED + VHR (290mV), the AL3644CH12-7 enters pass mode: the synchronous pMOS fully turns on, connecting IN directly to OUT with only RPMOS (86mΩ) drop. In this state, the boost converter remains inactive, delivering >95% efficiency with zero switching loss, ideal for high-VIN torch operation or IR mode with minimal heat generation.
What is the maximum allowable LED forward voltage?
The AL3644CH12-7 supports LED forward voltages up to VOUT − VHR, where VOUT is limited by its 4.75V overvoltage protection threshold. With VHR = 290mV, the maximum sustainable LED VF is 4.46V. Exceeding this causes the OVP comparator to disable switching and latch off until reset via HWEN or power cycle - protecting both the IC and connected LEDs from overvoltage stress.
AL3644CH12-7 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
AL3644CH12-7 FAQ
1.How can I place an order for AL3644CH12-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL3644CH12-7 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 AL3644CH12-7 reliable?
The price and inventory of AL3644CH12-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL3644CH12-7 is usually 5 days.
3.What payment methods are accepted for AL3644CH12-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL3644CH12-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL3644CH12-7?
AL3644CH12-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL3644CH12-7 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 AL3644CH12-7?
For technical support, including AL3644CH12-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL3644CH12-7 requirements.
6.How does Aetrix verify that AL3644CH12-7 is sourced from the original manufacturer or authorized distributors?
All AL3644CH12-7 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 AL3644CH12-7 meets industry standards.
7.What is the process for return or replacement of AL3644CH12-7?
All AL3644CH12-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL3644CH12-7, 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 AL3644CH12-7 part is unused and in its original packaging.
Return procedure for AL3644CH12-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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