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Texas Instruments LM2754SQX
- Part No.:
- LM2754SQX
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM2754SQX.pdf
- Description:
- IC LED DRIVER RGLTR 200MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,026
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Product details
Overview
LM2754SQX from Texas Instruments is a 24-pin WQFN-switched capacitor flash LED driver IC optimized for mobile camera flash applications. It delivers up to 800mA total regulated output current across four parallel current sinks, supports adaptive 1x/1.5x/2x charge pump gain selection, operates from 2.8V–5.5V input, and integrates time-out protection and RF PA synchronization via TX pin.
For engineers reviewing the LM2754SQX datasheet, LM2754SQX pinout, LM2754SQX application, or LM2754SQX equivalent, key selection considerations include its 4-channel parallel current sink architecture, torch/flash dual-current programming via ISET1/ISET2 resistors, SEL pin-enabled 3-LED configuration support, thermal shutdown at 150°C, and 24-pin 4mm × 4mm WQFN package with exposed DAP.
Technical Context
The LM2754SQX implements an adaptive CMOS charge pump with closed-loop regulation that dynamically selects 1x, 1.5x, or 2x gain based on LED forward voltage and load demand-transitioning in 2ms (Flash) or 125ms (Torch). Its four independent current sinks each regulate up to 200mA (Flash) or 100mA (Torch), with headroom voltage of 550mV at 200mA.
Logic control includes EN (shutdown <1µA), T/F (mode select), TX (RF-synchronized torch override), and SEL (D4 disable), all with internal 500kΩ pull-downs. Internal soft-start limits inrush current, and time-out circuitry disables flash after 1 second unless interrupted by TX high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 800mA total (200mA per sink in Flash mode); enables driving 1–4 white LEDs in parallel |
| Input Voltage Range | 2.8V–5.5V; compatible with single-cell Li-ion and Li-poly battery systems |
| Charge Pump Gains | Adaptive 1x/1.5x/2x; maintains VOUT regulation while maximizing efficiency across varying LED VF |
| Switching Frequency | 1MHz ±30%; enables compact external ceramic capacitor sizing (CIN/C1/C2 = 2.2µF, COUT = 4.7µF) |
| Current Set Accuracy | ±7% at 50–100mA; ±11.5% at 200mA; determined by 1.25V reference and external RSET resistor |
| Headroom Voltage | 550mV at 200mA; defines minimum voltage drop across current sink to maintain regulation |
| Shutdown Current | <1µA; achieved via EN pin low; ensures minimal battery drain during standby |
| Thermal Protection | Junction shutdown at 150°C (typ.), recovery at 120°C (typ.); requires PCB thermal land and vias to DAP |
Pinout & Package
LM2754SQX uses a thermally enhanced 24-pin WQFN package (4mm × 4mm × 0.8mm, Package Code RTW0024A) with exposed die attach pad (DAP) for PCB-level thermal management. Pin 1 is marked by top-side dot; pins 23–24 are internally connected VINSW; pins 9/16/17 are GND; pins 4/6 are no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN, VINSW (22,23,24) | Input power supply connection | Must be tied together externally; supplies charge pump input and internal bias rails |
| VOUT (8) | Regulated output node | Connects to LED anodes; loosely regulated to 4.7V (1x/1.5x) or 5.1V (2x) under no-load |
| D1–D4 (12–15) | Current sink outputs | Sink regulated current to LED cathodes; each supports ≤200mA Flash / ≤100mA Torch |
| ISET1, ISET2 (10,11) | Current set reference inputs | 1.25V internal reference; RSET1/RSET2 to GND set torch/flash current per sink (IDx ≈ 800 × 1.25V/RSET) |
| EN (21) | Master enable control | Logic high (>1.2V) enables device; logic low (<0.4V) shuts down with <1µA IQ |
| T/F (20) | Torch/Flash mode select | High = Flash (ISET2); Low = Torch (ISET1); timeout disables flash after 1s unless TX active |
| TX (19) | RF PA synchronization input | High forces immediate switch to Torch current level during RF transmission pulse |
| SEL (18) | D4 current sink disable | High disables D4; enables 3-LED flash modules; D4 must be tied to VOUT when disabled |
| C1±, C2± (1,2,5,7) | Flying capacitor connections | Interface with internal charge pump switches; require low-ESR X5R/X7R MLCCs (2.2µF) |
| GND, GNDSW (3,9,16,17) | Ground return paths | All must be connected to common system ground; GNDSW ties to switch array ground |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Reduces BOM count and board area; eliminates EMI concerns associated with magnetic components |
| Adaptive gain switching | Automatically selects optimal 1x/1.5x/2x charge pump ratio to maximize efficiency across LED VF variation |
| Integrated time-out protection | Prevents thermal damage by disabling flash current after 1 second unless overridden by TX signal |
| RF PA synchronization (TX pin) | Enables coordinated reduction of LED current during RF transmission to avoid battery droop and interference |
| True output disconnect in shutdown | VOUT is electrically isolated from VIN during EN = low; prevents backfeed into flash circuitry |
| Thermally enhanced WQFN | 4mm × 4mm package with exposed DAP achieves θJA = 42°C/W; enables high-power flash operation with proper PCB layout |
Applications
| Camera Flash in Mobile Phones | Flash for Digital Cameras |
|---|---|
Use Scenario: Integrated rear-facing camera module requiring brief, high-intensity illumination for low-light photography. IC Role / Device Role / Timing Role: LM2754SQX acts as the primary flash LED driver, delivering synchronized 800mA peak current across four parallel white LEDs with precise torch/flash mode control. Use Value: Enables consistent flash brightness and color temperature across varying battery voltage (3.0–4.2V), while TX pin coordination avoids RF interference during cellular transmission. | Use Scenario: Compact digital still camera with dual-mode lighting: continuous torch for video and pulsed flash for still capture. IC Role / Device Role / Timing Role: LM2754SQX provides regulated current sinking for both modes, using ISET1 for 200mA torch and ISET2 for 800mA flash, with SEL pin supporting 3-LED configurations. Use Value: Eliminates need for external inductors and reduces solution size to <28mm², critical for space-constrained portable imaging devices. |
| LED Flash Modules for Portable Devices | Flash Driver in DSP/Microprocessor Systems |
Use Scenario: Standalone flash LED module used in MP3 players, pagers, or wearable cameras where board space and thermal budget are limited. IC Role / Device Role / Timing Role: LM2754SQX serves as the complete flash power management unit, integrating charge pump, current regulation, and protection logic in one WQFN package. Use Value: Delivers 800mA output with <1µA shutdown current and internal soft-start, extending battery life and preventing inrush stress on power rails. | Use Scenario: Embedded vision subsystem in industrial handheld scanner or medical diagnostic tool requiring reliable flash illumination. IC Role / Device Role / Timing Role: LM2754SQX interfaces directly with host processor GPIOs (EN, T/F, TX, SEL) to execute timed flash sequences under firmware control. Use Value: Supports precise timing via 1MHz fixed-frequency operation and fast gain transitions (2ms Flash), enabling sub-100ms flash response for real-time imaging. |
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 integrated charge pump - requires external boost converter | Supports dynamic brightness control via I²C; lacks time-out and TX sync features of LM2754SQX | Choose LM3530TMX/NOPB when digital interface and fine-grained dimming are required over integrated power conversion. |
| MAX8630YETA+ | 3-channel flash driver with integrated 2x charge pump; max 600mA total output; no TX pin or SEL functionality | Limited to 3 LEDs; lacks RF synchronization and 4th current sink; smaller 20-pin TQFN package | Choose MAX8630YETA+ only for cost-sensitive 3-LED designs where TX coordination and full 800mA capability are not needed. |
Compared with LM3530TMX/NOPB and MAX8630YETA+, the LM2754SQX uniquely combines 4-channel 800mA drive, adaptive gain charge pump, hardware-based TX synchronization, and SEL-configurable 3/4-LED support in a single monolithic IC-making it optimal for high-performance mobile flash where integration, timing precision, and RF coexistence are critical.
Availability
LM2754SQX is available at Aetrix Electronics and suitable for camera flash in mobile phones, flash for digital cameras, and LED flash modules for portable devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2754SQX 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and consumer design expertise.
The LM2754SQX belongs to TI's portable power management product line, designed specifically for high-efficiency, low-noise flash LED driving in space- and thermal-constrained mobile imaging systems.
FAQ
What is the maximum total output current supported by the LM2754SQX?
The LM2754SQX supports a maximum total output current of 800mA, distributed across its four regulated current sinks (D1–D4), with each sink capable of delivering 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 LM2754SQX handle RF power amplifier interference during flash operation?
When the TX pin of the LM2754SQX is driven high, the device immediately forces LED current to the Torch level (set by ISET1) for the duration of the RF PA pulse, then automatically reverts to Flash current (ISET2) upon TX deactivation. This hardware-level synchronization prevents battery voltage droop and RF noise coupling without requiring firmware intervention.
Can the LM2754SQX drive fewer than four LEDs, and how is this configured?
Yes-the LM2754SQX supports 1-, 2-, 3-, or 4-LED configurations. To disable the fourth current sink (D4), assert a logic high on the SEL pin; D4 must then be connected to VOUT. The remaining three sinks (D1–D3) retain full 200mA Flash capability, enabling up to 600mA total for 3-LED modules while maintaining identical regulation accuracy and timing behavior.
What external capacitors are required for stable operation of the LM2754SQX?
The LM2754SQX requires four external MLCCs: CIN and COUT (4.7µF, 10V-rated), plus two flying capacitors C1 and C2 (2.2µF each). All must be X5R or X7R dielectric, low-ESR (<20mΩ) ceramic types-TDK C1608X5R1C225 (2.2µF) and C2012X5R1C475 (4.7µF) are validated equivalents. Tantalum or electrolytic capacitors are explicitly not recommended due to high ESR.
Does the LM2754SQX include thermal protection, and how does it behave?
Yes-the LM2754SQX incorporates junction thermal shutdown that disables all output current when die temperature exceeds 150°C (typ.), recovering automatically when temperature falls below 120°C (typ.). This protection works independently of time-out and shutdown modes. Effective thermal performance requires soldering the exposed DAP to a PCB thermal land with vias to inner ground planes, as specified in the WQFN-24 layout guidelines.
LM2754SQX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
LM2754SQX FAQ
1.How can I place an order for LM2754SQX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2754SQX 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 LM2754SQX reliable?
The price and inventory of LM2754SQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2754SQX is usually 5 days.
3.What payment methods are accepted for LM2754SQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2754SQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2754SQX?
LM2754SQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2754SQX 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 LM2754SQX?
For technical support, including LM2754SQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2754SQX requirements.
6.How does Aetrix verify that LM2754SQX is sourced from the original manufacturer or authorized distributors?
All LM2754SQX 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 LM2754SQX meets industry standards.
7.What is the process for return or replacement of LM2754SQX?
All LM2754SQX units undergo pre-shipment inspection (PSI). If there is an issue with LM2754SQX, 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 LM2754SQX part is unused and in its original packaging.
Return procedure for LM2754SQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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