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Texas Instruments LM3642TLX-LT/NOPB
- Part No.:
- LM3642TLX-LT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 9-WFBGA, DSBGA
- Datasheet:
-
LM3642TLX-LT/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 1.5A 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,845
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Product details
Overview
LM3642TLX-LT/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 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 from 24 mA to 187 mA (LT variant), and features hardware STROBE enable and TX/TORCH synchronization for RF power amplifier events.
For engineers reviewing the LM3642TLX-LT/NOPB datasheet, LM3642TLX-LT/NOPB pinout, LM3642TLX-LT/NOPB application, or LM3642TLX-LT/NOPB equivalent, this page provides verified technical context, I²C register-controlled current programming, thermal/overvoltage/fault protection behavior, and validated alternative options for smartphone LED flash subsystem design.
Technical Context
The LM3642TLX-LT/NOPB integrates a fixed-frequency 4-MHz synchronous boost converter and a high-side current source that remains in regulation via adaptive headroom voltage (VHR) control - maintaining ≥150 mV at 24 mA torch and ≥275 mV at 1.5-A flash. Its pass-mode operation eliminates switching when VIN > VLED + VHR, reducing quiescent current to 0.75 mA.
Control is implemented via a 400-kHz I²C-compatible interface (7-bit address 0x63) supporting Flash/Torch current programming, flash timeout selection (100–800 ms), input voltage flash monitor (IVFM), and real-time fault flag reporting (thermal shutdown, OVP, UVLO, LED open/short). Hardware inputs include STROBE (active-high flash trigger) and TX/TORCH (synchronization or torch enable), both with 300-kΩ internal pulldowns.
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 battery without pre-regulation. |
| Flash LED Current Accuracy | ±8% at 1.5 A - ensures consistent flash intensity across units and temperature (−40°C to 85°C). |
| Torch LED Current Range (LT) | 24 mA to 187 mA - programmable via I²C for low-power illumination with ±10% accuracy. |
| Switching Frequency | 4 MHz ±9% - enables use of <1 µH inductors and 10-µF ceramic output capacitors for compact layout. |
| Overvoltage Protection Trip | 5.0 V ±2.3% - clamps output during LED open fault to prevent damage to downstream circuitry. |
| Thermal Shutdown Threshold | 150°C (typ.) - disables all switching and current source, with automatic recovery after flag register read. |
| I²C Interface Speed | 400 kHz - compatible with standard microcontroller I²C peripherals without clock stretching. |
Pinout & Package
LM3642TLX-LT/NOPB uses a 0.5-mm pitch, 9-bump DSBGA package (1.69 mm × 1.64 mm body size), optimized for space-constrained mobile camera modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power input | Connects to 2.5–5.5 V battery rail; requires ≥10-µF ceramic bypass capacitor to GND for stability. |
| OUT | Boost converter output | Supplies regulated voltage to LED anode; connects to 10-µF output capacitor and LED cathode via GND return path. |
| SW | Switch node | Internal NMOS/PMOS drain connection; must be routed with minimal loop area to reduce EMI and switching loss. |
| GND | Ground reference | Common return for power, current sense, and logic; requires low-impedance PCB plane connection. |
| LED | High-side current source output | Drives LED anode directly; current magnitude set by I²C registers or hardware mode (STROBE/TX). |
| STROBE | Hardware flash enable | Active-high logic input (0.4 V low / 1.2 V high); triggers immediate flash pulse independent of I²C state. |
| TX/TORCH | Synchronization or torch enable | Configurable input: forces flash-to-torch transition during PA transmit; internal 300-kΩ pulldown ensures safe default. |
| SDA | I²C data line | Open-drain bidirectional interface; requires external pullup to VIO (1.8–5.5 V); supports 400-kHz timing. |
| SCL | I²C clock line | Input-only clock signal; synchronizes register reads/writes and enforces setup/hold timing per JEDEC spec. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive headroom regulation | Maintains ≥150 mV (torch) or ≥275 mV (flash) across current source to ensure regulation over full VIN and LED Vf range. |
| Hardware-triggered flash | STROBE pin initiates flash pulse with <4 µs latency, enabling precise timing alignment with image capture signals. |
| RF power amplifier sync | TX/TORCH input reduces LED current to torch level during PA transmit, limiting peak battery current without firmware intervention. |
| Input voltage flash monitor (IVFM) | Dynamically limits flash current ramp-up if VIN drops below programmable threshold, preventing brownout during flash burst. |
| Fault detection & reporting | Real-time flags for thermal shutdown, overvoltage, undervoltage lockout, and LED open/short - readable via I²C Flags Register (0x0B). |
Applications
| Smartphone Camera Flash | Tablet Imaging Module |
|---|---|
|
Use Scenario: High-intensity flash illumination for low-light photography in compact handheld devices with single-cell Li-ion battery supply. IC Role / Device Role / Timing Role: Synchronous boost driver + high-side current source delivering 1.5-A peak current with hardware STROBE triggering synchronized to image sensor exposure timing. Use Value: Enables consistent 1.5-A flash output across 2.5–5.5 V battery range while minimizing solution size (<20 mm²) and eliminating need for external current-sense resistors. |
Use Scenario: Dual-mode LED lighting for video conferencing and still capture in mid-size tablets with thermal constraints. IC Role / Device Role / Timing Role: Programmable current source supporting both high-current flash (1.5 A) and low-power torch (24–187 mA) modes via I²C or TX/TORCH pin control. Use Value: Provides seamless transition between flash and torch using same LED path, reducing BOM count and enabling software-defined lighting profiles. |
| Mobile Barcode Scanner | Wearable AR Camera |
|
Use Scenario: Short-duration, high-brightness illumination for rapid barcode reading under variable ambient light conditions. IC Role / Device Role / Timing Role: Flash driver with 100-ms minimum flash timeout and hardware STROBE activation, allowing sub-100-ms illumination bursts triggered by scan engine logic. Use Value: Delivers repeatable 1.5-A flash pulses with <4 µs STROBE-to-current onset, ensuring reliable decode performance without CPU polling overhead. |
Use Scenario: Ultra-compact near-eye imaging system requiring minimal board area and low thermal dissipation during intermittent flash use. IC Role / Device Role / Timing Role: DSBGA-packaged flash driver with pass-mode efficiency and thermal shutdown (150°C) protecting sensitive optics and battery in sealed enclosure. Use Value: Achieves <20 mm² total solution size and 85%+ efficiency in torch mode, extending wearable battery life while meeting stringent spatial constraints. |
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 | Same 4-MHz boost architecture but supports dual-LED configuration (2× 750 mA) and higher torch range (up to 500 mA); no TX/TORCH sync pin. | Targeted at dual-LED camera systems requiring independent channel control; lacks RF sync capability. | Select LM3648YFFR only when dual-LED drive and higher torch current are required; not drop-in for LM3642TLX-LT/NOPB due to pinout and feature differences. |
| MAX77691EWL+T | Integrated PMIC with 1.2-A flash driver, lower max current than LM3642TLX-LT/NOPB; includes buck, LDOs, and fuel gauge; I²C address differs (0x6C). | Used in systems where flash driver is one function within broader power management; requires different register map and fault handling. | Choose MAX77691EWL+T when consolidating power rails and flash control into single IC; verify thermal derating for 1.2-A flash in same PCB footprint. |
Compared with LM3642TLX-LT/NOPB, LM3648YFFR offers dual-channel flexibility at the cost of missing TX/TORCH sync, while MAX77691EWL+T trades flash current headroom for system-level integration - making LM3642TLX-LT/NOPB optimal for space-constrained, single-LED mobile flash with RF-aware timing control.
Availability
LM3642TLX-LT/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and portable barcode scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceability for consumer electronics production.
Supply support for LM3642TLX-LT/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 high-reliability IC design.
The LM3642TLX-LT/NOPB belongs to TI's LED flash driver product line, engineered specifically for high-efficiency, small-footprint camera illumination in battery-powered mobile devices operating across −40°C to 85°C ambient ranges.
FAQ
What is the maximum flash current supported by the LM3642TLX-LT/NOPB?
The LM3642TLX-LT/NOPB supports a maximum flash current of 1.5 A with ±8% accuracy across temperature and input voltage. This rating is confirmed in the Electrical Characteristics table (Section 6.5) for 1.5-A flash mode at VOUT = 4 V, and applies specifically to the LT variant which retains full 1.5-A capability despite its reduced torch range (24–187 mA).
Does the LM3642TLX-LT/NOPB require external current-sense resistors?
No, the LM3642TLX-LT/NOPB does not require external current-sense resistors. Its high-side current source uses internal sensing and regulation, as stated in the Functional Block Diagram and Feature Description sections. The device achieves ±8% flash current accuracy and ±10% torch current accuracy without any external components for current measurement.
How does the TX/TORCH pin function in the LM3642TLX-LT/NOPB?
In the LM3642TLX-LT/NOPB, the TX/TORCH pin serves as a configurable synchronization input: when pulled high during flash mode, it forces immediate transition to programmed torch current (24–187 mA), reducing battery load during RF power amplifier events. It also functions as an active-high torch enable when flash is inactive, with a 300-kΩ internal pulldown ensuring safe default state.
What package type and dimensions does the LM3642TLX-LT/NOPB use?
The LM3642TLX-LT/NOPB uses a 9-bump DSBGA (YZR) package with 0.5-mm pitch and maximum body dimensions of 1.69 mm × 1.64 mm. This information is explicitly listed in the "Device Information" table (page 2) and "Mechanical, Packaging, and Orderable Information" section (page 24) of the SNVS891H datasheet.
Can the LM3642TLX-LT/NOPB operate in pass mode, and what are its benefits?
Yes, the LM3642TLX-LT/NOPB operates in pass mode when VIN exceeds VLED + headroom voltage (VHR), turning on the internal PFET fully to deliver current without switching. This mode reduces quiescent current to 0.75 mA and eliminates switching losses, improving efficiency in high-VIN conditions - a key advantage confirmed in Section 7.1 (Overview) and Section 7.4.2 (Pass Mode) of the datasheet.
LM3642TLX-LT/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-LT/NOPB FAQ
1.How can I place an order for LM3642TLX-LT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3642TLX-LT/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-LT/NOPB reliable?
The price and inventory of LM3642TLX-LT/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-LT/NOPB is usually 5 days.
3.What payment methods are accepted for LM3642TLX-LT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3642TLX-LT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3642TLX-LT/NOPB?
LM3642TLX-LT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3642TLX-LT/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-LT/NOPB?
For technical support, including LM3642TLX-LT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3642TLX-LT/NOPB requirements.
6.How does Aetrix verify that LM3642TLX-LT/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3642TLX-LT/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-LT/NOPB meets industry standards.
7.What is the process for return or replacement of LM3642TLX-LT/NOPB?
All LM3642TLX-LT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3642TLX-LT/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-LT/NOPB part is unused and in its original packaging.
Return procedure for LM3642TLX-LT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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