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Texas Instruments LM3552SDX/NOPB
- Part No.:
- LM3552SDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM3552SDX/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 1A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
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Product details
Overview
LM3552SDX/NOPB from Texas Instruments is a fixed-frequency, current-mode step-up DC/DC white LED flash driver with integrated dual low-side NFETs (FET-T and FET-F), 1.25MHz switching frequency, 2.7–5.5V input range, and up to 1A total output current for high-power camera flash applications in single-cell Li-ion systems.
For engineers reviewing the LM3552SDX/NOPB datasheet, LM3552SDX/NOPB pinout, LM3552SDX/NOPB application, or LM3552SDX/NOPB equivalent, key selection criteria include torch/flash mode control via T/F pin, programmable flash timeout via external CFTO, EN pin enable logic, over-voltage protection threshold (12.4V typ), and WSON-14 package thermal performance (θJA = 37.3°C/W).
Technical Context
The LM3552SDX/NOPB implements a current-mode PWM boost converter architecture with 1.25MHz constant switching frequency and internal error amplifier (gm = 135 µmho, AV = 135 V/V). It uses two independent low-side NFETs-FET-T (RDSON = 0.98Ω, ≤200mA) for continuous torch mode and FET-F (RDSON = 0.36Ω, ≤500mA) for pulsed flash mode-to deliver up to 1A combined LED current.
Flash timeout protection operates via a precision 1.4µA current source charging external CFTO; trip occurs at VFTO = 1.16V, enabling predictable pulse duration control. Over-voltage protection engages at 12.4V (typ) and releases at 10.6V (typ), while undervoltage lockout activates below 2.48V (typ) with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li-ion battery discharge curve without regulation loss. |
| Switching Frequency | 1.25MHz (typ) - enables use of small 4.7µH inductors and low-ESR ceramic capacitors. | Max Output Current | 1A total - sum of torch (via FET-T) and flash (via FET-T + FET-F) currents, configurable via RT/RF resistors. |
| OVP Threshold | 12.4V (typ) - protects LED, capacitor, and inductor during open-circuit or FB fault conditions. |
| EN Pin Threshold | 1.2V (min) high = enabled - compatible with standard CMOS logic; internal 1.2MΩ pull-down ensures safe shutdown. |
| Thermal Resistance | θJA = 37.3°C/W - requires minimal PCB copper area for thermal management in handheld flash designs. |
| Soft-Start Control | SS pin with 11.5µA (typ) current source - allows user-defined ramp rate to limit inrush into output capacitance. |
Pinout & Package
The LM3552SDX/NOPB is housed in a 14-pin WSON package (4mm × 4mm, non-pullback, exposed die-attach pad) optimized for space-constrained mobile camera modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | 2.7–5.5V supply input; connects to Li-ion battery anode; must be decoupled with ≥10µF ceramic capacitor. |
| EN | Enable Control | Active-high logic input; ≥1.2V enables operation; internal 1.2MΩ pull-down ensures default shutdown state. |
| T/F | Mode Selection | Logic level determines operating mode: low = torch (FET-T only), high = flash (FET-T + FET-F enabled). |
| FB | Voltage Feedback | Monitors regulated output voltage; reference = 1.265V (±2.5mV); sets LED current via RT/RF resistor network. |
| FET-T | Torch FET Drain | Output node for torch-mode current path; RDSON = 0.98Ω; rated for ≤200mA continuous. |
| FET-F | Flash FET Drain | Output node for flash-mode current path; RDSON = 0.36Ω; rated for ≤500mA pulsed operation. |
| FTO | Flash Timeout | Connects to external CFTO; 1.4µA current charges capacitor; 1.16V trip disables both FETs and SW. |
| SW | Switch Node | Drain of internal power NFET; swings up to 20V; connects to boost inductor and Schottky diode anode. |
| GND / AGND | Analog & Power Ground | Separate ground pins; AGND ties compensation components and soft-start cap; must connect to GND via low-impedance trace. |
| OVP | Over-Voltage Sense | Monitors output voltage; grounding disables OVP (not recommended); open = active protection. |
| VC | Compensation | Connects RC/CC network to stabilize feedback loop; cancels output capacitor pole for stability. |
| SS | Soft-Start | Accepts external CSS capacitor; 11.5µA current source ramps internal reference to limit startup inrush. |
| DAP | Thermal Pad | Exposed die-attach pad; must be soldered to PCB thermal plane for θJA = 37.3°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent low-side FETs | FET-T (0.98Ω) and FET-F (0.36Ω) enable precise separation of torch (continuous) and flash (pulsed) current paths. |
| Programmable flash timeout | External CFTO sets exact flash duration (TFTO = CFTO × 1.21 µA/V); prevents LED damage from timing faults. |
| Integrated over-voltage protection | 12.4V (typ) trip point with automatic recovery at 10.6V (typ); eliminates need for external OVP circuitry. |
| True load disconnect in shutdown | Feedback resistors and LED load fully isolated from VIN; shutdown current ≤2.3µA (LM3552). |
| 1.25MHz constant-frequency PWM | Predictable EMI spectrum; supports compact 4.7µH inductor and low-voltage-rated ceramic output capacitors. |
Applications
| White LED Camera Flash | Cellular Camera Phone Flash |
|---|---|
Use Scenario: High-intensity, short-duration illumination for smartphone rear/front cameras during low-light capture. IC Role / Device Role / Timing Role: LM3552SDX/NOPB acts as flash-mode current controller, delivering up to 1A peak current with precise timing governed by T/F and FTO pins. Use Value: Enables compliance with IEC 62471 photobiological safety limits while achieving >1000-lumen flash output from single Li-ion cell. | Use Scenario: Dual-mode illumination system supporting both video torch (steady) and still-image flash (burst) in compact mobile platforms. IC Role / Device Role / Timing Role: LM3552SDX/NOPB provides independent torch (FET-T only) and flash (FET-T + FET-F) current regulation, controlled by baseband processor GPIOs. Use Value: Eliminates need for discrete MOSFETs and timing ICs; reduces BOM count by 4+ components versus discrete solutions. |
| DSC (Digital Still Camera) Flash | Camcorder Torch (Flashlight) Lamp |
Use Scenario: Compact point-and-shoot or mirrorless camera requiring high-efficiency flash drive with thermal headroom. IC Role / Device Role / Timing Role: LM3552SDX/NOPB serves as primary boost converter and current switch, regulating LED current via FB pin and managing thermal load via junction temperature monitoring. Use Value: Delivers 700mA flash current at 90% efficiency (VIN = 3.6V) with thermal shutdown at 140°C (typ), preventing lens housing overheating. | Use Scenario: Portable camcorder or action camera needing stable, flicker-free continuous illumination for video recording. IC Role / Device Role / Timing Role: LM3552SDX/NOPB operates in torch mode (T/F = low), using FET-T to deliver 200mA continuous current with <1% ripple. Use Value: Achieves >120-lumen torch output with <0.5% current variation across -40°C to +85°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3551SDX/NOPB | Uses SD (shutdown) pin with 0.3V threshold and internal 1.2MΩ pull-up; identical analog core and pinout except SD vs EN. | Requires inverted logic control signal; same torch/flash functionality and thermal performance. | Select LM3551SDX/NOPB when host MCU GPIO defaults high or lacks active-low enable capability. |
| TPS61310DSQR | Single-FET boost driver (no integrated torch/flash FETs); requires external MOSFETs; 1.5MHz switching; no flash timeout circuit. | Needs additional external components for dual-mode operation; no built-in OVP or FTO; higher design complexity. | Choose TPS61310DSQR only if custom current shaping or >1A flash current is required beyond LM3552SDX/NOPB's integrated capability. |
Compared with LM3551SDX/NOPB, LM3552SDX/NOPB offers simplified enable logic for modern low-voltage MCUs; compared with TPS61310DSQR, it delivers complete flash subsystem integration-reducing layout area by 35%, eliminating 6 external passives, and guaranteeing flash timing safety via on-chip timeout.
Availability
LM3552SDX/NOPB is available at Aetrix Electronics and suitable for cellular camera phone flash, digital still camera flash, and camcorder torch applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3552SDX/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and consumer markets.
The LM3552SDX/NOPB belongs to TI's white LED flash driver product line, engineered specifically for space-constrained, battery-powered imaging devices requiring reliable dual-mode (torch/flash) current control with integrated safety features.
FAQ
What is the maximum continuous current the LM3552SDX/NOPB can deliver in torch mode?
The LM3552SDX/NOPB delivers up to 200mA continuously in torch mode using the FET-T output (RDSON = 0.98Ω). This is set by the RT resistor per the equation RTORCH = (1.265V / ITORCH) − 0.98Ω. Exceeding 200mA risks thermal overload due to FET-T power dissipation; the device includes thermal shutdown at 140°C (typ) to protect LM3552SDX/NOPB.
How does the flash timeout function work on the LM3552SDX/NOPB?
The LM3552SDX/NOPB flash timeout function uses a 1.4µA (typ) current source to charge an external capacitor (CFTO) on the FTO pin. When voltage reaches 1.16V (typ), the internal EN signal is forced low, disabling both FET-T and FET-F and turning off the SW FET. The timeout duration is calculated as TFTO = CFTO × 1.21 µA/V. This feature prevents LED damage during timing faults and is fully configurable for LM3552SDX/NOPB.
Can the LM3552SDX/NOPB drive multiple white LEDs in series?
No - the LM3552SDX/NOPB is designed for single-string white LED operation with typical forward voltages up to 10V (OVP-limited). Its boost topology generates regulated output voltage based on FB feedback, but the integrated FET-T and FET-F are low-side switches intended for common-anode LED configurations. Driving multiple series LEDs would exceed the 20V SW pin rating and violate the LM3552SDX/NOPB's current-setting architecture.
What is the purpose of the separate AGND and GND pins on the LM3552SDX/NOPB?
The LM3552SDX/NOPB separates AGND (analog ground) and GND (power ground) to isolate noise-sensitive analog circuitry - including the error amplifier, VC compensation network, SS capacitor, and CFTO - from high-current switching paths. AGND must connect to GND through a low-impedance trace near the IC to prevent ground bounce from degrading regulation accuracy or causing instability in the feedback loop of LM3552SDX/NOPB.
Is the LM3552SDX/NOPB pin-compatible with the LM3551SDX/NOPB?
Yes - the LM3552SDX/NOPB and LM3551SDX/NOPB share identical pinout, package (WSON-14), and analog functionality. The only difference is the enable/shutdown logic: LM3552SDX/NOPB uses EN (active-high, internal 1.2MΩ pull-down), while LM3551SDX/NOPB uses SD (active-low, internal 1.2MΩ pull-up). No PCB changes are required to substitute LM3552SDX/NOPB for LM3551SDX/NOPB if control logic is adjusted accordingly.
LM3552SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A (Flash)
- Frequency:
- 1.25MHz
- Dimming:
- -
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-WSON (4x4)
LM3552SDX/NOPB FAQ
1.How can I place an order for LM3552SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3552SDX/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 LM3552SDX/NOPB reliable?
The price and inventory of LM3552SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3552SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3552SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3552SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3552SDX/NOPB?
LM3552SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3552SDX/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 LM3552SDX/NOPB?
For technical support, including LM3552SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3552SDX/NOPB requirements.
6.How does Aetrix verify that LM3552SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3552SDX/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 LM3552SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3552SDX/NOPB?
All LM3552SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3552SDX/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 LM3552SDX/NOPB part is unused and in its original packaging.
Return procedure for LM3552SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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