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Texas Instruments LM2754SQ/NOPB
- Part No.:
- LM2754SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM2754SQ/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 200MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,768
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Product details
Overview
LM2754SQ/NOPB from Texas Instruments is a switched-capacitor flash LED driver IC optimized for mobile camera applications, delivering up to 800mA total regulated current across four parallel current sinks, operating from 2.8V–5.5V input, with adaptive 1x/1.5x/2x charge pump gain and integrated time-out protection for flash pulses.
For engineers reviewing the LM2754SQ/NOPB datasheet, LM2754SQ/NOPB pinout, LM2754SQ/NOPB application, or LM2754SQ/NOPB equivalent, key selection criteria include torch/flash dual-current programming via ISET1/ISET2 resistors, TX-pin RF synchronization capability, SEL-pin 3-LED mode support, and thermal-aware WQFN-24 package layout requirements.
Technical Context
The LM2754SQ/NOPB implements an adaptive CMOS charge pump with closed-loop regulation targeting 4.7V (1x/1.5x) or 5.1V (2x) unloaded VOUT, dynamically selecting gain based on LED forward voltage and load to maximize efficiency. Gain transitions occur in ≤2ms during flash mode and reset upon shutdown/re-enable.
It integrates four independent current sinks (D1–D4), each supporting up to 200mA in flash mode or 100mA in torch mode, with headroom voltage as low as 150mV at 50mA and 550mV at 200mA, enabling operation with low-VF white LEDs. Internal soft-start limits inrush current, and true shutdown disconnects VOUT from VIN while drawing <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Current | 800mA total (200mA per sink × 4 sinks), enabling high-brightness flash for 4-LED modules |
| Input Voltage Range | 2.8V–5.5V, compatible with single-cell Li-ion (3.0–4.2V) and USB-powered systems |
| Charge Pump Gains | Adaptive 1x/1.5x/2x modes-automatically selected to maintain regulation without external control |
| Flash Time-Out | 1-second maximum pulse duration (typ.), preventing thermal runaway during sustained flash activation |
| Switching Frequency | 1MHz (0.7–1.3MHz range), enabling compact 2.2µF flying capacitors and low EMI |
| Shutdown Current | <1µA (0.1–1µA), minimizing battery drain in standby state |
| Headroom Voltage | 150mV @ 50mA, 550mV @ 200mA-supports low-forward-voltage LEDs while maintaining regulation |
Pinout & Package
LM2754SQ/NOPB uses a thermally enhanced 24-pin WQFN package (4mm × 4mm × 0.8mm) with exposed DAP for PCB-level heat dissipation. Pin pitch is 0.5mm; recommended footprint includes thermal vias under the DAP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN, VINSW (Pins 22, 23, 24) | Input power supply connection | Must be shorted externally; supplies charge pump core and internal logic-requires 2.2µF ceramic bypass |
| VOUT (Pin 8) | Regulated output node | Connects to LED anodes; voltage loosely regulated to 4.7V (1x/1.5x) or 5.1V (2x) under no-load |
| D1–D4 (Pins 12–15) | Current sink outputs | Each sinks programmed LED current; D4 disabled when SEL = HIGH for 3-LED modules |
| ISET1/ISET2 (Pins 10, 11) | Torch/Flash current reference inputs | Resistor-to-GND sets current: IDx ≈ 800 × (1.25V / RSET); supports independent torch (≤100mA/sink) and flash (≤200mA/sink) levels |
| EN (Pin 21) | Master enable | Logic HIGH enables device and enters torch mode; LOW forces true shutdown with VOUT disconnected and <1µA draw |
| T/F (Pin 20) | Flash/torch mode select | Logic HIGH activates flash mode (ISET2 current); timeout disables sinks after 1 second unless interrupted by TX |
| TX (Pin 19) | RF PA synchronization | Logic HIGH forces immediate switch to torch current (ISET1) during RF transmission-flash resumes when TX returns LOW |
| SEL (Pin 18) | 4th LED disable control | Logic HIGH disables D4 sink; allows use with 3-LED modules while preserving per-sink current rating |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI concerns-uses only four low-ESR MLCCs (CIN, COUT, C1, C2) |
| Adaptive gain selection | Automatically chooses 1x/1.5x/2x based on VF and load-no external feedback or mode pins required |
| True output disconnect | VOUT is internally disconnected from VIN during shutdown-prevents backfeed and leakage into LED strings |
| Integrated time-out and thermal protection | Hardware-limited 1s flash duration + junction shutdown at 150°C (releases at 120°C)-no firmware or external supervision needed |
| RF-aware flash control | TX pin overrides flash mode synchronously with RF PA pulses-avoids battery sag and interference during transmission |
Applications
| Mobile Phone Camera Flash | Digital Still Camera Flash |
|---|---|
Use Scenario: High-intensity illumination for smartphone rear/front cameras in low-light conditions, synchronized with image capture timing. IC Role / Device Role / Timing Role: Flash LED driver providing 800mA peak current across 4 parallel white LEDs, with 1s hardware time-out and TX-driven RF coordination. Use Value: Enables bright, consistent flash without battery voltage collapse or thermal throttling-critical for consumer-grade photo quality. | Use Scenario: Compact flash module in portable digital cameras requiring stable current drive for multi-LED arrays. IC Role / Device Role / Timing Role: Regulated current source with adaptive gain to maintain brightness across varying LED VF and battery voltage (3.0–4.2V). Use Value: Delivers full 800mA flash output even at end-of-discharge (3.0V), eliminating dimming artifacts in field use. |
| Portable Media Player Lighting | Low-Power DSP/Microprocessor Power Supply |
Use Scenario: Torch-mode illumination for video recording or UI backlighting in MP3 players and handheld devices. IC Role / Device Role / Timing Role: Dual-mode driver supporting continuous 400mA torch (100mA × 4) with programmable ISET1 resistor and soft-start. Use Value: Provides flicker-free, stable LED current without inductor ripple-ideal for human-perceived lighting applications. | Use Scenario: Local 5V rail generation for DSPs, microprocessors, or memory in space-constrained portable systems. IC Role / Device Role / Timing Role: Switched-capacitor DC/DC converter delivering up to 4.7V/800mA from 3.6V input with 1MHz fixed frequency. Use Value: Replaces inductor-based solutions where board area <28mm² is mandatory and moderate efficiency (≥85% at 3.6V→4.7V) suffices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor flash LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | 4-channel I²C-programmable LED driver with analog dimming; no built-in time-out or TX sync; requires external MCU control | Used in systems needing dynamic brightness adjustment via host processor-not suitable for standalone flash timing | Select when precise digital current control and multi-level dimming outweigh need for autonomous flash timing |
| TPS61310DSKR | Inductor-based boost converter with 1.5A switch; supports up to 28V output but requires external inductor and diode | Preferred for higher-output-voltage (>5.5V) or higher-efficiency (>90%) flash designs where board area is less constrained | Select when VOUT > 5.5V or system-level efficiency >90% is mandatory-accepts added BOM cost and EMI filtering |
Compared with LM3530TMX/NOPB, LM2754SQ/NOPB provides autonomous flash timing and RF sync without MCU involvement; compared with TPS61310DSKR, it eliminates inductors and reduces solution size by >40%, trading peak efficiency for integration and layout simplicity.
Availability
LM2754SQ/NOPB is available at Aetrix Electronics and suitable for mobile phone camera flash modules, digital still camera lighting systems, and portable media player torch applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2754SQ/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in portable power and LED driver innovation.
The LM2754SQ/NOPB belongs to TI's high-current switched-capacitor LED driver product line, designed specifically for space-constrained mobile imaging systems requiring robust flash timing, RF coexistence, and thermal resilience.
FAQ
What is the maximum total LED current supported by the LM2754SQ/NOPB?
The LM2754SQ/NOPB supports up to 800mA total output current, distributed across its four regulated current sinks (D1–D4), with each sink rated for up to 200mA in flash mode or 100mA in torch mode. This rating assumes proper thermal management using the exposed DAP and recommended PCB layout per TI Application Note AN-1187.
How does the TX pin function in the LM2754SQ/NOPB during RF transmission?
The TX pin on the LM2754SQ/NOPB forces an immediate transition from flash-mode current (set by ISET2) to torch-mode current (set by ISET1) when driven HIGH, synchronizing LED dimming with RF power amplifier pulses. Flash mode automatically resumes when TX returns LOW-timeout protection remains inactive during TX assertion.
Can the LM2754SQ/NOPB drive fewer than four LEDs, and how is that configured?
Yes-the LM2754SQ/NOPB supports 1-, 2-, 3-, or 4-LED configurations. To disable D4 for 3-LED modules, assert HIGH on the SEL pin (Pin 18). D4 must then be connected to VOUT. All current sinks retain their per-sink current ratings, so maximum flash current becomes 600mA (200mA × 3) in this configuration.
What capacitor types are recommended for the LM2754SQ/NOPB, and why?
The LM2754SQ/NOPB requires low-ESR multilayer ceramic capacitors (MLCCs) with X5R or X7R dielectrics-specifically 2.2µF for C1/C2/CIN and 4.7µF for COUT. Tantalum, aluminum electrolytic, and Y5V/Z5U ceramics are explicitly discouraged due to high ESR or severe capacitance drift over temperature and bias, which degrade charge pump stability and efficiency.
Does the LM2754SQ/NOPB require external compensation or feedback components?
No-the LM2754SQ/NOPB operates autonomously with no external compensation or feedback components. Its adaptive gain selection, internal reference, and regulated current sinks are fully self-contained. Only four external MLCCs (CIN, COUT, C1, C2) and two current-setting resistors (RSET1, RSET2) are required for full operation.
LM2754SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.8V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.7V ~ 5.1V
- Current - Output / Channel:
- 200mA (Flash)
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LM2754SQ/NOPB FAQ
1.How can I place an order for LM2754SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2754SQ/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 LM2754SQ/NOPB reliable?
The price and inventory of LM2754SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2754SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2754SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2754SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2754SQ/NOPB?
LM2754SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2754SQ/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 LM2754SQ/NOPB?
For technical support, including LM2754SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2754SQ/NOPB requirements.
6.How does Aetrix verify that LM2754SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2754SQ/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 LM2754SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2754SQ/NOPB?
All LM2754SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2754SQ/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 LM2754SQ/NOPB part is unused and in its original packaging.
Return procedure for LM2754SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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