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Texas Instruments LM3642TLE-LT/NOPB
- Part No.:
- LM3642TLE-LT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 9-WFBGA, DSBGA
- Datasheet:
-
LM3642TLE-LT/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 1.5A 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:530
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Product details
Overview
LM3642TLE-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 coordination.
For engineers reviewing the LM3642TLE-LT/NOPB datasheet, LM3642TLE-LT/NOPB pinout, LM3642TLE-LT/NOPB application, or LM3642TLE-LT/NOPB equivalent, key selection considerations include its 9-bump DSBGA package, I²C-compatible 400-kHz interface, adaptive regulation architecture, flash-to-torch settling time of 4 µs, and VIN flash monitor optimization for battery-aware current control.
Technical Context
The LM3642TLE-LT/NOPB integrates a fixed-frequency 4-MHz synchronous current-mode PWM boost converter with a high-side current source, enabling grounded-cathode LED configuration. Its adaptive regulation maintains current-source headroom voltage (VHR) ≥150 mV at torch and ≥275 mV at flash, ensuring stable LED current across input voltage variations from 2.5 V to 5.5 V.
Control is implemented via an I²C-compatible interface (7-bit address 0x63) supporting register-based programming of flash/torch currents, timeout duration (100–800 ms), input voltage flash monitor threshold, and fault flag readback. Hardware inputs - STROBE (active-high flash trigger) and TX/TORCH (synchronization interrupt) - feature internal 300-kΩ pulldown resistors and operate independently of I²C commands.
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 without pre-regulation. |
| Flash LED Current Accuracy | ±8% at 1.5 A - ensures consistent flash brightness across production 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 ultra-small 10-µF ceramic output capacitor and low-profile inductor (< 20 mm² solution size). |
| Overvoltage Protection | 5.0 V typical trip point - safeguards system against open-LED fault by disabling NMOS switch when VOUT exceeds threshold. |
| Quiescent Current | 0.75 mA - minimizes standby power draw during pass-mode operation with no switching activity. |
| Thermal Shutdown | 150°C junction activation - protects IC under sustained overload; requires Flags Register read to clear and resume operation. |
Pinout & Package
LM3642TLE-LT/NOPB is housed in a 0.5-mm pitch, 9-bump DSBGA package measuring 1.69 mm × 1.64 mm, optimized for space-constrained mobile camera modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 OUT | Power output | Boost converter output node; requires 10-µF ceramic capacitor to GND for stability and ripple suppression. |
| A2 SW | Power switch node | Internal NMOS/PMOS drain connection; connects to external inductor and sets switching waveform shape. |
| A3 GND | Ground reference | Primary thermal and signal return path; must be low-impedance plane for EMI and efficiency. |
| B1 LED | High-side current source output | Drives LED anode; enables grounded-cathode LED layout for simplified PCB routing and thermal management. |
| B2 STROBE | Digital input | Hardware flash trigger - active-high with 300-kΩ internal pulldown; initiates flash sequence independent of I²C. |
| B3 IN | Power input | Main supply input; bypassed with ≥10-µF ceramic capacitor to GND for transient response and noise immunity. |
| C1 TX/TORCH | Digital input | RF synchronization input - forces immediate transition from flash to torch mode when pulled high during PA transmit. |
| C2 SDA | I²C bidirectional data | Open-drain I²C data line; requires external pullup; supports 400-kHz communication for register access. |
| C3 SCL | I²C clock input | Master-generated clock; defines timing for register reads/writes and flash parameter updates. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive current-source regulation | Maintains ≥150 mV headroom at torch and ≥275 mV at flash to ensure LED current remains in regulation across battery discharge. |
| Hardware STROBE + TX/TORCH inputs | Enables deterministic flash triggering and real-time RF event synchronization without I²C latency or firmware intervention. |
| VIN flash monitor (IVFM) | Adjusts flash current dynamically based on input voltage level to prevent excessive battery peak current during low-VIN conditions. |
| Integrated fault protection | Detects and flags LED open/short, overvoltage, thermal shutdown, and undervoltage lockout - all requiring explicit register read to clear. |
| Soft-start ramp-up | Steps through current levels during enable to limit inrush current and avoid input voltage droop on shared battery rails. |
Applications
| Smartphone Camera Flash | Tablet Front-Facing Illumination |
|---|---|
Use Scenario: High-intensity still-image capture in low-light environments using single white LED. IC Role / Device Role / Timing Role: Provides precisely regulated 1.5-A flash current with <4 µs flash-to-torch settling for rapid preview/focus illumination. Use Value: Enables consistent exposure across battery voltage range while minimizing thermal stress via adaptive headroom control. |
Use Scenario: Video call illumination with adjustable brightness and smooth dimming transitions. IC Role / Device Role / Timing Role: Delivers stable 24–187 mA torch current with independently programmable ramp-up/down times. Use Value: Supports flicker-free video lighting with minimal power draw and seamless integration into Android HAL lighting frameworks. |
| Wireless Security Camera Module | Industrial Barcode Scanner |
Use Scenario: Night-vision assist in battery-powered outdoor IP cameras with motion-triggered flash. IC Role / Device Role / Timing Role: Acts as standalone flash controller triggered by MCU GPIO (STROBE) and synchronized to IR cut filter actuation. Use Value: Eliminates need for external current-sense resistor or DAC; reduces BOM count and layout area in compact modules. |
Use Scenario: Short-duration, high-current LED pulse for barcode illumination in handheld scanners. IC Role / Device Role / Timing Role: Generates 100–800 ms programmable flash pulses with hardware timeout to prevent LED overheating. Use Value: Ensures reliable decode performance under varying ambient light while protecting LED lifetime via OVP and thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3642YFFR | Same die, 9-bump DSBGA but non-LT variant - supports 48.4–375 mA torch range instead of 24–187 mA. | Requires higher minimum torch current; unsuitable where ultra-low-power indicator mode is critical. | Select LM3642YFFR only if full-range torch capability is needed and 375 mA max is acceptable. |
| RT8542GQW | Fixed 1.2-A flash current, no I²C interface, no TX/TORCH sync input, uses external current-sense resistor. | Lacks programmability and RF synchronization - limited to basic flash-only use cases without dynamic control. | Choose RT8542GQW for cost-sensitive, static-flash designs where firmware control and PA sync are unnecessary. |
Compared with LM3642TLE-LT/NOPB, LM3642YFFR offers wider torch current range but removes low-end precision, while RT8542GQW sacrifices programmability and synchronization for lower component count - making LM3642TLE-LT/NOPB optimal for RF-coordinated, battery-aware mobile imaging systems.
Availability
LM3642TLE-LT/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet front-facing illumination, wireless security camera flash, and industrial barcode scanner designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3642TLE-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 interface solutions for industrial, automotive, and consumer markets.
The LM3642 product line was developed specifically for high-efficiency, space-constrained LED flash and torch applications in mobile imaging systems, emphasizing adaptive regulation, hardware synchronization, and robust fault handling.
FAQ
What is the torch current range supported by LM3642TLE-LT/NOPB?
The LM3642TLE-LT/NOPB supports a programmable torch LED current range of 24 mA to 187 mA, with ±10% accuracy across −40°C to +85°C ambient temperature. This LT variant is specifically optimized for low-power illumination scenarios where fine-grained control at the lower end of the current spectrum is required, distinguishing it from the standard LM3642 which supports 48.4 mA to 375 mA.
How does the TX/TORCH pin function in LM3642TLE-LT/NOPB?
The TX/TORCH pin on LM3642TLE-LT/NOPB serves as a hardware synchronization input that forces an immediate transition from flash mode to torch mode when pulled high - typically used to coordinate with RF power amplifier transmit events. It features a 300-kΩ internal pulldown resistor and operates independently of I²C commands, ensuring deterministic timing without firmware latency or bus contention.
Does LM3642TLE-LT/NOPB support I²C communication, and what is its address?
Yes, LM3642TLE-LT/NOPB supports a 400-kHz I²C-compatible interface with a fixed 7-bit slave address of 0x63 (1100011b). The interface allows full register-level control of flash/torch currents, timeout duration, IVFM threshold, and fault flag status. SDA and SCL pins require external pullup resistors, and acknowledge bits are generated by the device after each byte received.
What protection features are integrated into LM3642TLE-LT/NOPB?
LM3642TLE-LT/NOPB integrates overvoltage protection (5.0 V typical trip), thermal shutdown (150°C activation), undervoltage lockout (2.8 V falling threshold), LED open/short detection, and input current limiting. All faults set corresponding bits in the Flags Register, and most - including UVLO, TSD, and LED fault - clear only upon explicit read of that register, ensuring reliable fault logging in host firmware.
What is the recommended output capacitor value for LM3642TLE-LT/NOPB?
The recommended output capacitor for LM3642TLE-LT/NOPB is a 10-µF ceramic capacitor placed between the OUT pin and GND. This value is specified in the datasheet to ensure stable regulation, minimize output ripple, and support the 4-MHz switching frequency. X5R or X7R dielectrics with 6.3-V or higher rating are advised to maintain capacitance under DC bias and temperature variation.
LM3642TLE-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)
LM3642TLE-LT/NOPB FAQ
1.How can I place an order for LM3642TLE-LT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3642TLE-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 LM3642TLE-LT/NOPB reliable?
The price and inventory of LM3642TLE-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 LM3642TLE-LT/NOPB is usually 5 days.
3.What payment methods are accepted for LM3642TLE-LT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3642TLE-LT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3642TLE-LT/NOPB?
LM3642TLE-LT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3642TLE-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 LM3642TLE-LT/NOPB?
For technical support, including LM3642TLE-LT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3642TLE-LT/NOPB requirements.
6.How does Aetrix verify that LM3642TLE-LT/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3642TLE-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 LM3642TLE-LT/NOPB meets industry standards.
7.What is the process for return or replacement of LM3642TLE-LT/NOPB?
All LM3642TLE-LT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3642TLE-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 LM3642TLE-LT/NOPB part is unused and in its original packaging.
Return procedure for LM3642TLE-LT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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