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Texas Instruments LM3642TLX/NOPB
- Part No.:
- LM3642TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 9-WFBGA, DSBGA
- Datasheet:
-
LM3642TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 1.5A 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,681
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Product details
Overview
LM3642TLX/NOPB from Texas Instruments is a 4-MHz synchronous boost LED flash driver with integrated 1.5-A high-side current source, designed for single-white-LED camera flash applications in mobile devices. It operates from 2.5 V to 5.5 V input, delivers programmable flash current up to 1.5 A and torch current up to 375 mA, and features I²C-compatible control (400 kHz), hardware STROBE enable, and TX/TORCH synchronization input for RF power amplifier coordination.
For engineers reviewing the LM3642TLX/NOPB datasheet, LM3642TLX/NOPB pinout, LM3642TLX/NOPB application, or LM3642TLX/NOPB equivalent, key selection considerations include its 9-bump DSBGA package (1.69 mm × 1.64 mm), adaptive regulation maintaining >85% efficiency in both flash and torch modes, overvoltage protection (5 V typ.), thermal shutdown (150°C), and precise current accuracy (±8% at 1.5 A flash).
Technical Context
The LM3642TLX/NOPB integrates a fixed-frequency (4 MHz) current-mode PWM boost converter and a high-side current source in a single die. Its adaptive regulation dynamically maintains minimum headroom voltage (VHR) across the LED to keep the current source in regulation-switching only when VIN < VLED + VHR, otherwise operating in pass mode with PFET fully on.
Control is implemented via a 7-bit I²C address (0x63) supporting register-based programming of flash/torch currents, timeout (100–800 ms), input voltage flash monitor threshold, and fault flag reads. Hardware interfaces include active-high STROBE for logic-triggered flash and TX/TORCH for real-time current reduction during PA transmit events, both with internal 300 kΩ pulldown resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports direct connection to single-cell Li-ion/Li-poly battery rails without pre-regulation. |
| Flash Current Accuracy | ±8% at 1.5 A - ensures consistent flash brightness across temperature and supply variation. |
| Torch Current Range | 48.4 mA to 375 mA (programmable) - enables flexible low-power illumination for video or UI feedback. |
| Switching Frequency | 4 MHz ±9% - allows use of ultra-small 1-µH inductors and 10-µF ceramic output capacitors. |
| Overvoltage Protection | 5.0 V typical trip - safeguards downstream circuitry during open-LED fault conditions. |
| Thermal Shutdown | 150°C junction temperature - disables all switching and current sourcing to prevent permanent damage. |
| I²C Interface Speed | 400 kHz - compatible with standard fast-mode I²C controllers without timing margin concerns. |
Pinout & Package
LM3642TLX/NOPB is housed in a 0.5-mm pitch, 9-bump DSBGA package (1.69 mm × 1.64 mm maximum body size), optimized for space-constrained mobile camera modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 OUT | Boost converter output | Connects to 10-µF ceramic capacitor and LED anode; supplies regulated voltage to high-side current source. |
| A2 SW | Switch node | Internal NMOS/PMOS drain connection; requires low-ESR inductor and careful layout to minimize EMI. |
| A3 GND | Ground reference | Primary return path for boost converter, current source, and logic; must be low-impedance plane. |
| B1 LED | High-side current source output | Drives LED cathode to ground; enables grounded-cathode LED configuration for thermal and optical optimization. |
| B2 STROBE | Hardware flash enable | Active-high logic input (300 kΩ internal pulldown); triggers immediate flash pulse independent of I²C state. |
| B3 IN | Input power supply | Accepts 2.5–5.5 V; bypassed with ≥10-µF ceramic capacitor to suppress battery ripple and transient load effects. |
| C1 TX/TORCH | Synchronization input | Configurable as RF PA sync (forces flash→torch transition) or active-high torch enable; 300 kΩ internal pulldown. |
| C2 SDA | I²C data line | Open-drain bidirectional interface (400 kHz); requires external pullup to VIO (1.8 V or 3.3 V). |
| C3 SCL | I²C clock line | Input-only clock signal; synchronizes register read/write operations and current ramp timing. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive regulation architecture | Maintains current-source headroom (VHR) dynamically to maximize efficiency across input/LED voltage combinations. |
| Hardware STROBE + TX/TORCH inputs | Enables deterministic flash triggering and real-time current throttling during RF transmit without I²C latency. |
| Programmable flash timeout (100–800 ms) | Prevents thermal runaway and battery over-discharge by auto-terminating flash pulses after configurable duration. |
| Integrated fault detection | Flags LED open/short, overvoltage, UVLO, thermal shutdown, and current limit events via I²C-accessible status register. |
| Soft-start operation | Staged current ramp-up limits inrush current during startup, protecting battery and PCB traces. |
Applications
| Smartphone Camera Flash | Tablet Front-Facing Illumination |
|---|---|
Use Scenario: High-intensity brief illumination for still image capture in low-light conditions. IC Role / Device Role / Timing Role: Provides precisely timed 1.5-A flash current with <100 µs STROBE response and programmable 100–800 ms duration. Use Value: Delivers consistent luminance across battery voltage range (2.5–5.5 V) while minimizing thermal stress via adaptive headroom control. |
Use Scenario: Continuous low-current illumination for front-facing video calls or facial recognition. IC Role / Device Role / Timing Role: Supplies stable 48.4–375 mA torch current with independently adjustable ramp-up/down times. Use Value: Enables smooth brightness transitions and low-noise operation without audible coil whine due to 4-MHz switching. |
| RF-Synchronized Flash Control | Mobile Device LED Indicator |
Use Scenario: Coordinating flash pulse timing with cellular/Wi-Fi power amplifier transmit bursts. IC Role / Device Role / Timing Role: Uses TX/TORCH pin to force instantaneous flash-to-torch current reduction during PA events. Use Value: Prevents battery voltage sag and system reset by limiting peak current draw during concurrent high-power RF + flash operation. |
Use Scenario: Low-power status indication using fractional torch current (1/8× programmed value). IC Role / Device Role / Timing Role: Generates 5 mA indicator current (LM3642LT variant) or scalable sub-torch level via register setting. Use Value: Reduces standby power consumption while maintaining visual feedback without requiring additional driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3648YFFR | Higher 2-A flash current capability; 2.7–5.5 V input; same 9-bump DSBGA package but different pinout (no TX/TORCH). | Lacks hardware synchronization input; requires full I²C control for flash timing coordination. | Select when higher peak current is required and RF sync is handled externally or via software polling. |
| RT8542GQW | 1.5-A flash driver with integrated 4-MHz boost; supports 2.5–5.5 V; uses 12-pin WLCSP (1.63 × 1.63 mm) and includes analog torch dimming. | No I²C interface-relies on EN/TORCH/STROBE pins only; no register-based current programming or fault reporting. | Choose for cost-sensitive designs where digital configurability and diagnostics are not required. |
Compared with LM3642TLX/NOPB, LM3648YFFR offers higher flash current but sacrifices RF sync capability, while RT8542GQW simplifies control at the expense of programmability and fault visibility-making LM3642TLX/NOPB optimal for feature-rich mobile imaging systems requiring coordinated power management.
Availability
LM3642TLX/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and mobile device LED illumination systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3642TLX/NOPB 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and interface solutions for industrial, automotive, and consumer markets.
The LM3642TLX/NOPB belongs to TI's LED flash driver product line, engineered specifically for high-efficiency, space-constrained mobile camera applications demanding precise current control, thermal resilience, and hardware-level RF coordination.
FAQ
What is the primary function of the LM3642TLX/NOPB in a mobile camera system?
The LM3642TLX/NOPB serves as a synchronous boost LED flash driver with integrated 1.5-A high-side current source. It delivers tightly regulated flash current to a single white LED while operating from a 2.5–5.5 V battery supply. Its design enables grounded-cathode LED configuration, supports hardware-triggered strobe pulses via the STROBE pin, and provides RF synchronization through the TX/TORCH input-making LM3642TLX/NOPB essential for reliable, low-latency illumination in modern smartphone cameras.
How does the LM3642TLX/NOPB manage efficiency across varying input voltages?
The LM3642TLX/NOPB uses adaptive regulation to maintain minimum headroom voltage (VHR) across the LED current source. When input voltage exceeds LED forward voltage plus VHR, it enters pass mode-turning on the internal PFET fully to minimize conduction loss. When VIN drops below that threshold, it switches to 4-MHz boost mode. This dual-mode operation sustains >85% efficiency in both flash (1 A–1.5 A) and torch (48.4 mA–375 mA) modes, as confirmed in the LM3642TLX/NOPB datasheet under typical operating conditions.
Can the LM3642TLX/NOPB be used without I²C communication?
Yes-the LM3642TLX/NOPB supports basic operation without I²C. Hardware pins STROBE and TX/TORCH allow standalone flash triggering and RF-synchronized current reduction. Default flash and torch current levels are factory-set, and the device powers up in standby until enabled. However, full functionality-including programmable current values, timeout duration, fault monitoring, and IVFM configuration-requires I²C access. So while LM3642TLX/NOPB can operate minimally without I²C, its advanced features depend on the interface.
What protection features are built into the LM3642TLX/NOPB?
The LM3642TLX/NOPB integrates overvoltage protection (5 V typical trip), undervoltage lockout (2.8 V threshold), thermal shutdown (150°C), LED open/short detection, and input current limiting. Each fault condition sets a dedicated flag in the I²C-accessible Flags Register and clears the Enable Register mode bits-ensuring safe shutdown and diagnostic visibility. These protections are active during both flash and torch operation, and their behavior is explicitly defined in the LM3642TLX/NOPB electrical characteristics and functional description sections.
Is the LM3642TLX/NOPB pin-compatible with other members of the LM364x family?
No-LM3642TLX/NOPB is not pin-compatible with LM3648YFFR or LM3643YFFR. Although all are 9-bump DSBGA flash drivers, their pin assignments differ significantly: LM3642TLX/NOPB places STROBE on B2 and TX/TORCH on C1, whereas LM3648YFFR assigns different functions to those positions and omits TX/TORCH entirely. The LM3642TLX/NOPB datasheet confirms this unique pinout in the "Pin Configuration and Functions" section, and no documentation states pin compatibility across variants. Therefore, board redesign is required when substituting LM3642TLX/NOPB with other LM364x parts.
LM3642TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- 1.5A (Flash)
- Frequency:
- 4MHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-DSBGA (1.6x1.6)
LM3642TLX/NOPB FAQ
1.How can I place an order for LM3642TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3642TLX/NOPB 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 LM3642TLX/NOPB reliable?
The price and inventory of LM3642TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3642TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3642TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3642TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3642TLX/NOPB?
LM3642TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3642TLX/NOPB 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 LM3642TLX/NOPB?
For technical support, including LM3642TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3642TLX/NOPB requirements.
6.How does Aetrix verify that LM3642TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3642TLX/NOPB 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 LM3642TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3642TLX/NOPB?
All LM3642TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3642TLX/NOPB, 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 LM3642TLX/NOPB part is unused and in its original packaging.
Return procedure for LM3642TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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