My Inquiry
My Account
Texas Instruments LM3648YFFR
- Part No.:
- LM3648YFFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
LM3648YFFR.pdf
- Description:
- IC LED DRIVER RGLTR 1.5A 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,125
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3648YFFR from Texas Instruments is a synchronous boost LED flash driver IC with a 1.5-A high-side current source, 2-MHz/4-MHz fixed-frequency operation, I²C-compatible interface (address 0x63), and hardware strobe/torch enable pins-designed for smartphone camera flash systems requiring precise current regulation and thermal-aware LED control.
For engineers reviewing the LM3648YFFR datasheet, LM3648YFFR pinout, LM3648YFFR application, or LM3648YFFR equivalent, this page delivers verified technical context, real-world operating parameters, validated pin functions, and confirmed alternative options for camera flash power management in battery-constrained mobile designs.
Technical Context
The LM3648YFFR integrates a synchronous boost converter (2 MHz or 4 MHz) with adaptive regulation to maintain ≥290 mV headroom (VHR) across its high-side current source, ensuring stable 1.5-A flash output even as input voltage drops from 5.5 V to 2.5 V. It supports three operating modes-Flash (64 programmable levels), Torch (128 levels), and IR-with independent ramp control and hardware-triggered transitions via STROBE, TORCH/TEMP, and TX pins.
Its functional architecture includes an internal NTC thermistor comparator (trip threshold 0.6 V ±5%), IVFM input voltage flash monitor (adjustable 2.9–3.6 V), overvoltage protection (4.86–5.1 V), and pass-mode operation when VIN ≥ VLED + VHR-eliminating switching loss and improving efficiency above threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Range (Flash) | 21.8 mA to 1.5 A (64 discrete programmable levels; accuracy ±7% at 1.5 A) |
| LED Current Range (Torch) | 1.954 mA to 178.6 mA (128 levels; ±10% accuracy; LM3648TT variant supports up to 502.3 mA) |
| Switching Frequency | 2 MHz or 4 MHz (±6%; enables use of 1-µH inductor and 10-µF ceramic capacitors) |
| VHR Headroom Voltage | 290 mV (min. required across current source to maintain regulation at 1.5 A) |
| I²C Interface | 400-kHz compatible; fixed address 0x63; supports register read/write for brightness, timeout, and status flags |
| Input Voltage Range | 2.5 V to 5.5 V (supports single-cell Li-ion and USB-powered systems) |
| Thermal Shutdown | Engages at TJ = 150°C (typ.), disengages at 135°C (typ.); RθJA = 90.2°C/W in YFF package |
Pinout & Package
LM3648YFFR uses a 12-pin DSBGA (YFF) package measuring 1.69 mm × 1.31 mm, optimized for ultra-compact mobile camera modules. All pins are surface-mount, with solder-ball pitch of 0.4 mm and GND-connected substrate for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 GND | Ground reference | Primary return path for power, analog, and digital circuits; connects to PCB ground plane |
| A2 IN | Input power supply | Accepts 2.5–5.5 V; requires ≥10-µF ceramic bypass capacitor to GND for stability |
| A3 SDA | I²C data line | Open-drain bidirectional interface; pulled up externally; supports 400-kHz timing |
| B1 SW | Switch node | Connects internal NMOS/PMOS switches; drives external inductor; high dv/dt node |
| B2 STROBE | Hardware flash trigger | Active-high input; internal 300-kΩ pulldown; initiates flash sequence immediately on rising edge |
| B3 SCL | I²C clock line | Input-only; requires external pull-up; defines I²C bus timing and synchronization |
| C1 OUT | Boost converter output | Drives LED anode via high-side current source; connect 10-µF ceramic cap to GND |
| C2 HWEN | Hardware enable/reset | Active-high; low = shutdown/reset; internal 300-kΩ pulldown; resets registers on falling edge |
| C3 TORCH/TEMP | Torch enable / NTC input | Dual-function: logic input (torch mode) or analog input (NTC thermistor sensing; 0.6 V trip) |
| D1 LED | High-side current source output | Connects directly to LED anode; D1 and D3 internally tied; rated for 1.5-A continuous DC |
| D2 TX | PA sync interrupt | Configurable dual-polarity input; forces flash→torch transition during RF transmit events |
| D3 LED | High-side current source output | Electrically connected to D1; both pins must be shorted externally per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Grounded-cathode LED topology | Enables direct PCB copper pour under LED cathode for optimal thermal dissipation in thin mobile form factors |
| Adaptive regulation with VHR control | Maintains constant 1.5-A LED current by dynamically switching between pass mode (no switching loss) and boost mode (regulated headroom) |
| IVFM input voltage flash monitor | Adjustable 2.9–3.6 V threshold with hysteresis; automatically scales down flash current during battery sag to prevent brownout |
| Hardware strobe + torch enable | Enables zero-latency flash activation and instant torch-on without I²C transaction overhead or software latency |
| NTC thermistor monitoring | Integrated comparator with 50-µA bias current and 0.6 V ±5% trip threshold for real-time LED temperature derating |
| Small solution size | <16 mm² total footprint using 1-µH inductor and 10-µF ceramic caps-fits within tight camera module height constraints |
Applications
| Smartphone Camera Flash | Digital Still Camera Module |
|---|---|
|
Use Scenario: Dual-LED white flash in flagship smartphones with real-time thermal and battery voltage compensation. IC Role / Device Role / Timing Role: High-side current source delivering 1.5-A peak flash current with hardware-triggered strobe and IVFM-based current scaling. Use Value: Enables consistent flash brightness across 2.5–5.5 V battery range while preventing thermal runaway via NTC feedback and automatic current reduction. |
Use Scenario: Compact DSLR or mirrorless camera accessory with programmable torch/flash modes and PA sync. IC Role / Device Role / Timing Role: Synchronous boost driver managing LED current in both continuous torch (128-level dimming) and pulsed flash (64-level precision) modes. Use Value: Eliminates need for external current-sense resistors and discrete MOSFETs-reducing BOM count and PCB area by >30% vs discrete solutions. |
| Emergency Strobe Lighting | Barcode Scanner Illumination |
|
Use Scenario: Low-power emergency beacon requiring high-intensity, short-duration flashes with thermal safety cutoff. IC Role / Device Role / Timing Role: Flash controller with hardware timeout (up to 1.6 s) and thermal shutdown (150°C) for fail-safe operation. Use Value: Guarantees flash pulse termination before LED junction exceeds safe temperature-even during extended operation or ambient >85°C. |
Use Scenario: Handheld industrial barcode scanner needing rapid, repeatable LED illumination pulses synchronized to image capture. IC Role / Device Role / Timing Role: IR Mode support with level-sensitive STROBE for externally timed LED bursts; no internal ramp delay. Use Value: Achieves sub-10 µs LED turn-on/turn-off timing for motion-blur-free scanning-critical for high-speed conveyor-line decoding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3648TT | Same die, different factory programming: supports higher torch current (500 mA vs 178.6 mA) and longer flash timeout (1.6 s vs default). | Targeted for premium camera modules requiring sustained high-brightness torch mode and extended flash duration. | Select LM3648TT only if 500-mA torch or >1-s flash timeout is required; otherwise LM3648YFFR offers identical flash performance and lower cost. |
| TPS61310DSQR | Boost converter + external current sink; no integrated high-side current source, no NTC monitoring, no hardware strobe/TX pins. | Suitable for non-camera applications where flash timing and thermal safety are not critical (e.g., indicator lighting). | Choose TPS61310DSQR only for cost-sensitive, non-thermal-critical designs where full LM3648YFFR feature set is unnecessary. |
Compared with LM3648TT, LM3648YFFR provides identical flash capability but limits torch current to 178.6 mA and lacks extended timeout-making it ideal for mainstream smartphones. Versus TPS61310DSQR, LM3648YFFR integrates all flash-specific functions (strobe, TX sync, IVFM, NTC) into one chip, reducing design risk and board space.
Availability
LM3648YFFR is available at Aetrix Electronics and suitable for smartphone camera modules, digital still camera accessories, and emergency strobe lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3648YFFR 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 leader specializing in analog, embedded processing, and power management technologies, with decades of experience in mobile power solutions.
The LM3648 product line was designed specifically for high-efficiency, thermally robust LED flash drivers in space-constrained portable imaging systems-emphasizing integration, reliability, and real-time system responsiveness.
FAQ
What is the maximum LED current supported by the LM3648YFFR in flash mode?
The LM3648YFFR supports a maximum LED current of 1.5 A in flash mode, with ±7% accuracy at that level. This is achieved using its integrated high-side current source and adaptive regulation that maintains ≥290 mV headroom voltage (VHR) across the current source. The device delivers this current across its full 2.5–5.5 V input range, making it suitable for single-cell Li-ion battery applications. LM3648YFFR does not support the higher torch current of the LM3648TT variant.
Does the LM3648YFFR support hardware-triggered flash activation without I²C communication?
Yes, the LM3648YFFR supports true hardware-triggered flash activation via its STROBE pin. When STROBE is driven high (with internal 300-kΩ pulldown), the device immediately initiates the programmed flash sequence-bypassing I²C latency entirely. This enables sub-microsecond response for time-critical camera shutter synchronization. The LM3648YFFR retains full programmability of flash current and timeout via I²C, but STROBE provides deterministic, zero-software-latency triggering.
How does the LM3648YFFR handle low input voltage during flash operation?
The LM3648YFFR implements Input Voltage Flash Monitor (IVFM) to dynamically scale flash current when input voltage drops below a user-configurable threshold (2.9–3.6 V). If VIN falls below the IVFM-D setting, the device reduces LED current to prevent battery brownout-ensuring system stability without requiring host processor intervention. This behavior is fully hardware-based and operates independently of I²C commands or firmware polling.
Can the LM3648YFFR drive LEDs in grounded-cathode configuration?
Yes, the LM3648YFFR is explicitly designed for grounded-cathode LED operation: its high-side current source outputs (pins D1 and D3) connect to the LED anode, while the cathode connects directly to PCB ground. This configuration maximizes thermal transfer from the LED to the PCB copper pour-critical for maintaining junction temperature below 125°C in thin mobile enclosures. The datasheet confirms this topology improves thermal management versus floating-cathode alternatives.
What thermal protection features are built into the LM3648YFFR?
The LM3648YFFR includes integrated thermal shutdown that activates at TJ = 150°C (typical) and releases at 135°C (typical), plus real-time NTC thermistor monitoring via the TORCH/TEMP pin. The NTC circuit uses a 50-µA bias current and trips at 0.6 V ±5%, allowing precise LED temperature derating before thermal shutdown occurs. These dual mechanisms-hardware-based thermal cutoff and analog temperature feedback-ensure robust protection in compact camera modules where airflow is limited.
LM3648YFFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-UFBGA, 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:
- -
- Current - Output / Channel:
- 1.5A (Flash)
- Frequency:
- 4MHz
- Dimming:
- -
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM3648YFFR FAQ
1.How can I place an order for LM3648YFFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3648YFFR 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 LM3648YFFR reliable?
The price and inventory of LM3648YFFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3648YFFR is usually 5 days.
3.What payment methods are accepted for LM3648YFFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3648YFFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3648YFFR?
LM3648YFFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3648YFFR 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 LM3648YFFR?
For technical support, including LM3648YFFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3648YFFR requirements.
6.How does Aetrix verify that LM3648YFFR is sourced from the original manufacturer or authorized distributors?
All LM3648YFFR 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 LM3648YFFR meets industry standards.
7.What is the process for return or replacement of LM3648YFFR?
All LM3648YFFR units undergo pre-shipment inspection (PSI). If there is an issue with LM3648YFFR, 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 LM3648YFFR part is unused and in its original packaging.
Return procedure for LM3648YFFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3648YFFR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
