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Texas Instruments LM3642TLE/NOPB
- Part No.:
- LM3642TLE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 9-WFBGA, DSBGA
- Datasheet:
-
LM3642TLE/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 1.5A 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:725
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Product details
Overview
LM3642TLE/NOPB from Texas Instruments is a 4-MHz synchronous boost LED flash driver with integrated 1.5-A high-side current source for single white LED operation in camera phone applications. It delivers programmable flash current (93 mA–1.5 A) and torch current (48.4–375 mA), operates from 2.5 V to 5.5 V input, and features I²C control, hardware STROBE enable, and TX/TORCH synchronization for RF power amplifier events.
For engineers reviewing the LM3642TLE/NOPB datasheet, LM3642TLE/NOPB pinout, LM3642TLE/NOPB application, or LM3642TLE/NOPB equivalent, key selection considerations include high-side current source architecture, adaptive regulation for efficiency >85% at 1 A flash, 0.5-mm-pitch 9-bump DSBGA package, 400-kHz I²C interface, and VIN flash monitor optimization for battery-aware flash sequencing.
Technical Context
The LM3642TLE/NOPB integrates a fixed-frequency 4-MHz synchronous current-mode PWM boost converter and a high-side current source that maintains regulation via headroom voltage (VHR) control-ensuring ≥150 mV at 24 mA torch and ≥275 mV at 1.5 A flash. Its pass mode operation eliminates switching when VIN exceeds VLED + VHR, reducing quiescent current to 0.75 mA.
Control is implemented through a 400-kHz I²C-compatible interface (7-bit address 0x63) supporting register-based configuration of flash/torch currents, timeout (100–800 ms), input voltage flash monitor thresholds, and fault flag reads. Hardware inputs include STROBE (active-high flash trigger) and TX/TORCH (synchronization input with 300 kΩ pulldown) enabling real-time current reduction during PA transmit bursts.
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 illumination intensity across production units |
| Torch LED Current Range | 48.4 mA to 375 mA - programmable via I²C for flexible UI indicator or low-power preview use |
| Switching Frequency | 4 MHz ±9% - enables use of <1 µH inductors and 10-µF ceramic output capacitors for compact layout |
| Overvoltage Protection | 5.0 V typical trip - safeguards downstream circuitry during open-LED fault conditions |
| Thermal Shutdown | 150°C junction - internal protection with automatic recovery after flag register read and temperature decay |
| I²C Interface Speed | 400 kHz - compatible with standard fast-mode controllers without timing margin concerns |
| Package | 9-bump DSBGA, 1.69 mm × 1.64 mm - ultra-compact footprint for space-constrained mobile camera modules |
Pinout & Package
LM3642TLE/NOPB uses a 0.5-mm pitch, 9-bump DSBGA (YZR) package measuring 1.69 mm × 1.64 mm maximum. Thermal resistance is RθJA = 100.0°C/W and RθJB = 16.4°C/W, optimized for PCB thermal relief via bottom-soldered bumps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Battery supply input; requires ≥10-µF ceramic bypass to GND for stable boost operation |
| OUT | Boost Output | DC-DC converter output node; connects to LED anode and 10-µF output capacitor |
| SW | Switch Node | Internal NMOS/PMOS drain connection; critical for EMI-sensitive routing and inductor placement |
| GND | Ground Reference | System ground return for all power and signal paths; must be low-impedance plane under IC |
| LED | Current Source Output | High-side current source output; connects directly to LED cathode for grounded-cathode topology |
| STROBE | Hardware Flash Enable | Active-high logic input with 300 kΩ internal pulldown; triggers immediate flash pulse independent of I²C |
| TX/TORCH | Synchronization Input | Configurable input with 300 kΩ pulldown; forces flash-to-torch transition during RF PA events |
| SDA | I²C Data Line | Open-drain bidirectional data line; requires external pullup to VIO (1.8 V or 3.3 V) |
| SCL | I²C Clock Line | Input-only clock line; driven by host controller at up to 400 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Regulation Architecture | Maintains current source in regulation across input and LED voltage variations using dynamic headroom control (VHR) |
| Hardware Synchronization (TX/TORCH) | Enables sub-microsecond flash current reduction during PA transmit to prevent battery droop and system reset |
| VIN Flash Monitor Optimization | Adjusts flash current ramp-up based on real-time input voltage to avoid overloading weak batteries |
| Soft-Start Operation | Staged current ramp-up limits inrush current during startup, protecting battery and output capacitor |
| Integrated Fault Detection | Real-time flags for LED open/short, thermal shutdown, UVLO, and overvoltage-readable via I²C Flags Register |
| Pass Mode Efficiency | Eliminates switching losses when VIN > VLED + VHR, achieving <1 µA standby current in disabled state |
Applications
| Smartphone Camera Flash | Tablet Front-Facing Flash |
|---|---|
Use Scenario: High-intensity still capture in low-light environments using dual-LED or single high-brightness white LED. IC Role / Device Role / Timing Role: Primary flash driver delivering 1.5-A regulated current with <100-ns STROBE response for precise exposure timing. Use Value: Enables consistent 1/15-s flash duration at full brightness while maintaining >85% efficiency and minimal thermal rise. | Use Scenario: Video call illumination with adjustable brightness and smooth dimming for natural skin-tone rendering. IC Role / Device Role / Timing Role: Torch-mode current source providing 48.4–375 mA with independent ramp-up/ramp-down control via I²C. Use Value: Supports flicker-free 60-Hz video recording by eliminating current step artifacts during brightness transitions. |
| RF-Synchronized Mobile Flash | Compact Camera Module |
Use Scenario: Simultaneous cellular transmission and flash capture in LTE/5G handsets where PA current draw competes with flash demand. IC Role / Device Role / Timing Role: Synchronization input (TX/TORCH) dynamically reduces flash current to 24–187 mA during PA burst windows. Use Value: Prevents brownout-induced system reset by limiting peak battery current to ≤2.2 A during concurrent PA+flash operation. | Use Scenario: Embedded vision systems in drones or AR glasses requiring minimal board area and low EMI emissions. IC Role / Device Role / Timing Role: Integrated 4-MHz boost converter and current source eliminate need for external controller or discrete FETs. Use Value: Reduces solution size to <20 mm² while meeting CISPR-22 Class B radiated emission limits via fixed-frequency operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3648TLE/NOPB | Same 9-bump DSBGA package but supports dual-LED configuration with independent current control per channel | Required for dual-LED camera modules needing asymmetric flash intensity (e.g., warm/cool white pairing) | Select LM3648TLE/NOPB only when dual-channel independent control is mandatory; LM3642TLE/NOPB offers lower cost and simpler firmware for single-LED use. |
| RT8542GQW | 4-MHz boost flash driver with 1.2-A max flash current, 2.7–5.5 V input, and no TX/TORCH sync input | Lacks hardware synchronization for RF PA events; relies solely on I²C-triggered flash termination | Choose RT8542GQW for cost-sensitive designs without RF coexistence requirements; LM3642TLE/NOPB is preferred where PA/flash timing coordination is critical. |
Compared with LM3648TLE/NOPB, LM3642TLE/NOPB provides higher flash current (1.5 A vs. 1.2 A per channel) and dedicated TX/TORCH sync, but lacks dual-LED support. Against RT8542GQW, it adds hardware-level PA synchronization and tighter current accuracy (±8% vs. ±12%), justifying its use in premium smartphone platforms.
Availability
LM3642TLE/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and compact embedded vision devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3642TLE/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 LM3642TLE/NOPB belongs to TI's mobile LED driver product line, engineered specifically for high-efficiency, space-constrained camera flash applications in consumer handheld devices operating from single-cell batteries.
FAQ
What is the maximum flash current supported by the LM3642TLE/NOPB?
The LM3642TLE/NOPB supports a maximum flash current of 1.5 A with ±8% accuracy at VOUT = 4 V. This rating is validated across the full operating temperature range (−40°C to +85°C) and is maintained using adaptive headroom voltage regulation to ensure the high-side current source remains in regulation under varying input and LED forward voltage conditions. The LM3642TLE/NOPB achieves this output without external current-sense resistors or discrete MOSFETs.
Does the LM3642TLE/NOPB require external components for basic operation?
Yes, the LM3642TLE/NOPB requires three essential external components: a 10-µF ceramic capacitor between IN and GND, a 10-µF ceramic capacitor between OUT and GND, and a small-signal inductor (typically 0.47–1.0 µH). No external current-sense resistor or gate drivers are needed-the high-side current source and synchronous boost switches are fully integrated. The LM3642TLE/NOPB's 4-MHz switching frequency allows these compact passive values.
How does the TX/TORCH pin function during flash operation?
During active flash mode, pulling the TX/TORCH pin high forces immediate transition to the programmed torch current level (e.g., 48.4–375 mA), reducing battery load during RF power amplifier transmission. If TX/TORCH is pulled low before flash timeout, the LM3642TLE/NOPB resumes the original flash current. The pin has a 300 kΩ internal pulldown, so no external resistor is required for default low-state behavior. This hardware-level response occurs in <4 µs, faster than I²C command latency.
What protection features are built into the LM3642TLE/NOPB?
The LM3642TLE/NOPB integrates six hardware protections: overvoltage protection (5.0 V typical trip), undervoltage lockout (2.8 V falling threshold), thermal shutdown (150°C junction), LED open/short detection, input current limit (programmable up to 1.88 A), and soft-start inrush control. All fault conditions set corresponding bits in the I²C-accessible Flags Register, and most clear the Enable Register mode bits to halt operation until host firmware acknowledges the event.
Is the LM3642TLE/NOPB pin-compatible with other members of the LM364x family?
No, the LM3642TLE/NOPB is not pin-compatible with LM3648TLE/NOPB or LM3644TLE/NOPB. Although all use the same 9-bump DSBGA (YZR) package, pin functions differ significantly-for example, LM3648 dedicates two pins to second LED control (LED2, EN2), while LM3642TLE/NOPB uses those positions for SDA and SCL. Board redesign is required when substituting across this family; the LM3642TLE/NOPB pinout is fixed per its YZR package definition in SNVS891H.
LM3642TLE/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/NOPB FAQ
1.How can I place an order for LM3642TLE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3642TLE/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/NOPB reliable?
The price and inventory of LM3642TLE/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/NOPB is usually 5 days.
3.What payment methods are accepted for LM3642TLE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3642TLE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3642TLE/NOPB?
LM3642TLE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3642TLE/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/NOPB?
For technical support, including LM3642TLE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3642TLE/NOPB requirements.
6.How does Aetrix verify that LM3642TLE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3642TLE/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/NOPB meets industry standards.
7.What is the process for return or replacement of LM3642TLE/NOPB?
All LM3642TLE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3642TLE/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/NOPB part is unused and in its original packaging.
Return procedure for LM3642TLE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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