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Texas Instruments LM2753SDX
- Part No.:
- LM2753SDX
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2753SDX.pdf
- Description:
- IC LED DRV RGLTR PWM 400MA 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,652
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Product details
Overview
LM2753SDX from Texas Instruments is a high-power switched-capacitor voltage converter and flash LED driver IC. It delivers regulated 5 V output (VOUT) across 3–5.5 V input, supports 200 mA continuous load current and 400 mA pulsed flash current, and features <10 ns flash turnon time via IOUT pin - enabling rapid strobe control in mobile camera modules.
For engineers reviewing the LM2753SDX datasheet, LM2753SDX pinout, LM2753SDX application, or LM2753SDX equivalent, key selection criteria include its PFM-regulated charge-pump architecture, dual-mode (torch/flash) LED drive capability, 10-pin WSON package thermal performance (RθJA = 52.5°C/W), and compatibility with low-ESR ceramic capacitor networks (CIN/COUT/C1).
Technical Context
The LM2753SDX implements a multi-level switch array within its 2× charge pump to dynamically adjust ON-resistance based on VIN - minimizing output ripple at high input voltages while sustaining >200 mA output at low VIN (3 V). Its PFM regulation modulates switching frequency (475–950 kHz) to maintain 5 V ±5% regulation under varying load and temperature (–40°C to +85°C).
Two independent logic-controlled paths operate simultaneously: EN enables global device operation (60 µA quiescent, <1 µA shutdown), while FLASH directly gates an internal FET between VOUT and IOUT with 10 ns turnon - allowing sub-microsecond flash activation without affecting torch-mode biasing via RTORCH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 5.5 V - matches Li-ion battery discharge profile without external LDO pre-regulation. |
| Regulated Output Voltage | 5 V ±5% (4.75–5.25 V) - stable supply for white LEDs requiring fixed forward voltage headroom. |
| Continuous Output Current | 200 mA at VOUT - sufficient for keypad/display backlight or low-power peripherals. |
| Pulsed Flash Current | 400 mA for ≤500 ms - drives high-brightness camera flash LEDs with minimal thermal stress. |
| Quiescent Current | 60 µA typical - extends standby battery life in always-on imaging subsystems. |
| Shutdown Current | 0.1 µA typical - enables deep-sleep power gating in portable devices. |
| Flash Turnon Time | 10 ns - ensures precise synchronization with image sensor exposure timing. |
Pinout & Package
LM2753SDX is housed in a 3.00 mm × 3.00 mm × 0.8 mm, 10-pin WSON package (no pullback) with exposed die-attach pad connected to GND for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1+ | Flying capacitor terminal | Connects to positive node of 1 µF flying capacitor (C1); forms charge-transfer path in doubler stage. |
| 2 VIN | Main power input | Accepts 3–5.5 V unregulated supply; powers internal oscillator, logic, and charge pump switches. |
| 3 C1− | Flying capacitor terminal | Connects to negative node of C1; completes flying capacitor loop during charge/discharge phases. |
| 4 FLASH | Digital flash enable input | Active-HIGH logic signal (1.2–VIN V) that gates internal VOUT→IOUT FET; internal 300 kΩ pulldown. |
| 5, 7, 10 GND | Ground reference | Three dedicated GND pins minimize ground bounce; die-attach pad must be soldered to PCB ground plane. |
| 6 EN | Global enable input | Active-HIGH logic control (1.2–VIN V) for full device startup/shutdown; internal 300 kΩ pulldown. |
| 8 IOUT | Flash LED output terminal | Switched output sourced from VOUT via internal FET; connects to LED cathode through RFLASH. |
| 9 VOUT | Regulated 5-V output | Primary regulated supply rail; powers torch-mode LED string via RTORCH and loads up to 200 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Inductor-less architecture | Uses only three low-ESR ceramic capacitors (CIN, COUT, C1) - eliminates EMI, size, and cost of magnetic components. |
| Multi-level switch array | Dynamically configures parallel MOSFETs to optimize efficiency and ripple across 3–5.5 V input range. |
| Soft-start ramp | VOUT rises from 0 to 5 V in 640 µs - prevents inrush current and system brownout during power-up. |
| Thermal protection | Shuts down at ~140°C junction temperature and recovers at ~125°C - prevents permanent damage under overload. |
| PWM brightness control | EN pin accepts PWM for torch dimming; FLASH pin accepts PWM for flash intensity scaling - linear duty-cycle response. |
Applications
| Cell-Phone Camera Flash | Digital Still Camera Strobe |
|---|---|
Use Scenario: Synchronizing high-current LED flash with CMOS image sensor exposure window in smartphones. IC Role / Device Role / Timing Role: Provides 400 mA pulsed current to white LED array with <10 ns turnon delay referenced to FLASH signal edge. Use Value: Enables crisp, low-motion-blur flash photography without requiring external gate drivers or timing controllers. |
Use Scenario: Driving multiple high-luminance LEDs for professional-grade still-camera auxiliary lighting. IC Role / Device Role / Timing Role: Delivers regulated 5 V at 200 mA continuous (torch) and 400 mA pulsed (flash) from single Li-ion cell. Use Value: Eliminates need for boost converter + separate LED driver IC, reducing BOM count and PCB area by >30%. |
| Barcode Scanner Illumination | Emergency Strobe Lighting |
Use Scenario: Powering high-intensity red/green LEDs for rapid barcode decoding in handheld scanners. IC Role / Device Role / Timing Role: Supplies stable 5 V to LED string while supporting PWM dimming via EN pin for adaptive brightness control. Use Value: Maintains consistent LED forward voltage across battery discharge cycle, ensuring reliable scan range and decode speed. |
Use Scenario: Generating high-visibility strobe pulses in fire-alarm notification panels and industrial hazard lights. IC Role / Device Role / Timing Role: Drives multiple LEDs in parallel using VOUT and IOUT outputs with programmable flash/torch current ratios. Use Value: Supports long-duration pulsing (≤500 ms) at 400 mA without thermal shutdown, meeting UL 924 strobe visibility requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530UMX/NOPB | Current-mode PWM LED driver with I²C interface; requires external inductor; max 30 mA per channel (6-channel). | Designed for RGB display backlight control, not high-current flash; lacks pulsed 400 mA capability. | Choose LM3530UMX/NOPB only for multi-color, digitally programmable backlighting - not for camera flash. |
| TPS61310DSKR | Inductor-based boost converter with integrated 2-A switch; 2.5–5.5 V input; 5-V/1.5-A output; no dedicated FLASH pin. | Higher output current but slower transient response (>10 µs turnon); no native flash/torch dual-mode logic interface. | Choose TPS61310DSKR when >400 mA continuous current is required and microsecond-level flash timing is not critical. |
Compared with LM2753SDX, LM3530UMX/NOPB offers digital control but cannot deliver flash-level current, while TPS61310DSKR provides higher power but lacks the sub-10 ns flash activation and integrated torch/flash logic separation essential for imaging systems.
Availability
LM2753SDX is available at Aetrix Electronics and suitable for cell-phone camera modules, barcode scanner illumination, and emergency strobe lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2753SDX 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 LM2753SDX belongs to TI's high-efficiency LED driver product line, engineered specifically for portable imaging systems requiring compact, inductor-free flash solutions with precise timing and thermal robustness.
FAQ
What is the maximum pulsed flash current supported by the LM2753SDX?
The LM2753SDX supports up to 400 mA pulsed flash current for durations up to 500 ms, as specified in its Electrical Characteristics table under IOUT parameter. This capability is enabled by its charge-pump architecture and internal FET switching between VOUT and IOUT, allowing rapid current delivery without inductor saturation concerns. The LM2753SDX maintains this performance across its full input voltage range (3–5.5 V) and operating temperature (–40°C to +85°C).
How does the LM2753SDX achieve 5-V regulation without an inductor?
The LM2753SDX uses a switched-capacitor doubler topology with pulse-frequency modulation (PFM) control to generate a regulated 5-V output from 3–5.5 V input. It employs three external ceramic capacitors - CIN (input), COUT (output), and C1 (flying) - to store and transfer charge in discrete phases. Regulation is maintained by dynamically adjusting switching frequency based on load and input conditions, ensuring VOUT stays within 4.75–5.25 V across all operating points. This inductor-less approach reduces EMI and board space versus traditional boost converters.
Can the LM2753SDX drive both torch and flash modes simultaneously?
No - the LM2753SDX does not support simultaneous torch and flash operation. Torch mode is implemented by connecting a resistor (RTORCH) between VOUT and IOUT to set continuous LED current, while flash mode activates the internal VOUT→IOUT FET via the FLASH pin to bypass RTORCH and deliver higher pulsed current. These modes are mutually exclusive: asserting FLASH HIGH disables torch current path and routes full VOUT current through IOUT. The datasheet explicitly states "Need TORCH ON to FLASH" only in context of enabling prior to flash activation - not concurrent operation.
What is the thermal resistance (RθJA) of the LM2753SDX in its WSON package?
The LM2753SDX in its 10-pin WSON package has a junction-to-ambient thermal resistance (RθJA) of 52.5°C/W, as documented in Section 6.4 of the official datasheet. This value assumes standard JEDEC high-k test board conditions. Effective thermal performance in end equipment depends on PCB layout - specifically, soldering the exposed die-attach pad to a minimum 100 mm² copper pour connected to internal ground planes. Under worst-case 400 mA flash load at 3.6 V input, calculated power dissipation (~0.8 W) combined with RθJA yields ~42°C junction rise above ambient, well within the 120°C max operating limit.
Does the LM2753SDX require external programming resistors for basic operation?
Yes - the LM2753SDX requires two external resistors for full functionality: RFLASH sets flash LED current by connecting between IOUT and the LED anode, while RTORCH sets continuous torch current by connecting between VOUT and IOUT. Neither resistor is needed for basic 5-V regulation at VOUT (e.g., powering non-LED loads), but both are mandatory for LED driving. The datasheet provides explicit calculation procedures in Section 7.3.5 for determining values based on target LED forward voltage and desired current - no internal DAC or register configuration is involved.
LM2753SDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.75V ~ 5.25V
- Current - Output / Channel:
- 400mA (Flash)
- Frequency:
- 725kHz
- Dimming:
- PWM
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SON (3x3)
LM2753SDX FAQ
1.How can I place an order for LM2753SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2753SDX 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 LM2753SDX reliable?
The price and inventory of LM2753SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2753SDX is usually 5 days.
3.What payment methods are accepted for LM2753SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2753SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2753SDX?
LM2753SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2753SDX 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 LM2753SDX?
For technical support, including LM2753SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2753SDX requirements.
6.How does Aetrix verify that LM2753SDX is sourced from the original manufacturer or authorized distributors?
All LM2753SDX 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 LM2753SDX meets industry standards.
7.What is the process for return or replacement of LM2753SDX?
All LM2753SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM2753SDX, 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 LM2753SDX part is unused and in its original packaging.
Return procedure for LM2753SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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