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Texas Instruments LM3528TMX/NOPB
- Part No.:
- LM3528TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3528TMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 12DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3528TMX/NOPB from Texas Instruments is a dual-output white LED bias supply with integrated OLED power supply, configured as a current-mode boost converter. It delivers up to 20 mA per string across MAIN and SUB/FB outputs, supports 128-step exponential dimming via I²C, and includes hardware enable, pattern generator, and GPIO functions. It is used in portable LCD backlighting with indicator LED integration.
For engineers reviewing the LM3528TMX/NOPB datasheet, LM3528TMX/NOPB pinout, LM3528TMX/NOPB application, or LM3528TMX/NOPB equivalent, key selection criteria include dual-current-sink matching (±1%), 22 V over-voltage protection, 1.25 MHz fixed-frequency operation, DSBGA-12 package footprint, and I²C-compatible control for independent or unison LED brightness regulation.
Technical Context
The LM3528TMX/NOPB integrates a current-mode PWM boost controller with two regulated outputs: MAIN (constant-current sink) and configurable SUB/FB (current sink or 1.21 V feedback input). Its adaptive regulation dynamically adjusts output voltage to minimize headroom loss across LED strings while maintaining ≥500 mV current-sink headroom.
It implements unison/non-unison mode selection via register bit UNI: unison mode enables 0.15% typical current matching between MAIN and SUB/FB, while non-unison allows independent 128-step dimming per channel. The internal 770 mA peak switch current limit and 22 V OVP threshold constrain maximum output power and protect downstream capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and USB-powered portable systems without external LDO. |
| Max Output Current per String | 20 mA - set by RSET = 12.1 kΩ; enables driving up to 6-series white LEDs per channel at full scale. |
| Current Matching Accuracy | ±1% (non-unison), ±0.15% (unison) - ensures uniform luminance across dual LCD backlight zones or indicator + main display. |
| Switching Frequency | 1.25 MHz (typ.) - permits use of compact 1 µH inductors and reduces EMI filtering burden in space-constrained layouts. |
| OVP Threshold | 22 V (min) - protects 16–20 V OLED panels and allows safe use of low-voltage-rated 25 V output capacitors. |
| I²C Interface | Standard-mode compatible (400 kHz max) - enables software-controlled dimming, pattern generation, and register configuration without additional MCU peripherals. |
| Thermal Shutdown | Triggers at TJ ≈ 150 °C - provides fail-safe protection during sustained high-power operation in sealed handheld enclosures. |
Pinout & Package
LM3528TMX/NOPB uses a 12-bump DSBGA package (1.215 mm × 1.615 mm × 0.6 mm), optimized for ultra-thin portable displays and wearable devices. The package features bottom-side solder bumps with no exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | OVP | Over-voltage sense input - connects directly to output capacitor anode to trigger shutdown if VOUT exceeds 22 V. |
| A2 | MAIN | Main current sink output - drives first white LED string; requires external Schottky diode and output capacitor. |
| A3 | SUB/FB | Dual-function terminal - sinks current for second LED string or serves as 1.21 V feedback node for OLED voltage regulation. |
| B1 | GPIO1 | Open-drain general-purpose I/O - programmable as input or output; supports status signaling or external interrupt handling. |
| B2 | SCL | I²C serial clock input - referenced to VIO; supports level-shifted interface with 1.7–5.5 V logic domains. |
| B3 | SET | Current-setting reference node - connects to GND via RSET to define full-scale LED current (ILED_MAX = 192 × 1.244 V / RSET). |
| C1 | HWEN/PGEN/GPIO | Multi-function pin - configurable as hardware enable (active-high), 32-bit pattern generator output, or open-drain GPIO. |
| C2 | SDA | I²C bidirectional data line - open-drain, level-shifted to VIO; supports standard-mode communication up to 400 kHz. |
| C3 | IN | Main power input - bypassed with 1 µF ceramic capacitor; accepts 2.7–5.5 V battery or regulator output. |
| D1 | VIO | I²C logic voltage reference - sets SCL/SDA high/low thresholds; decoupled separately from IN for noise immunity. |
| D2 | SW | Internal NMOS switch drain - connects to external inductor; requires low-ESR ceramic output capacitor and Schottky diode. |
| D3 | GND | Analog/digital ground - common return for all currents; must be connected to low-impedance PCB plane beneath DSBGA footprint. |
Key Features
| Feature | Design Value |
|---|---|
| 128-step exponential dimming | Enables perceptually linear brightness control across 0–100% range using only 7-bit register writes - eliminates gamma correction firmware overhead. |
| Integrated OLED power supply | Configures SUB/FB as 1.21 V feedback input to regulate up to 21 V output - eliminates need for separate DC/DC converter in hybrid LCD+OLED displays. |
| Programmable pattern generator | Outputs arbitrary 32-bit sequences at selectable frequencies/duty cycles on HWEN/PGEN/GPIO - drives blinking indicator LEDs without MCU intervention. |
| True shutdown isolation | Places MAIN, SUB/FB, and SW into high-impedance state during shutdown - prevents leakage current from draining battery in always-on portable devices. |
| 1% accurate current matching | Guarantees consistent luminance between dual backlight zones or main display + status indicator - critical for aesthetic uniformity in consumer UIs. |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
|
Use Scenario: Dual-zone backlight for 4.3″–7″ TFT LCDs in smartphones, wearables, and medical handhelds. IC Role / Device Role / Timing Role: MAIN and SUB/FB independently drive upper/lower display segments with synchronized dimming via I²C. Use Value: Enables local dimming effects and dynamic contrast enhancement while maintaining <1% current mismatch between zones. |
Use Scenario: Powering monochrome or color OLED modules in smartwatches and industrial HMIs requiring stable 18 V bias. IC Role / Device Role / Timing Role: SUB/FB operates in voltage-regulation mode; MAIN supplies indicator LEDs with matched current control. Use Value: Reduces BOM count by integrating OLED DC/DC and indicator LED driver - saves >2.5 mm² PCB area versus discrete solutions. |
| Indicator LED + Display Combo | Large-Format LCD Backlighting |
|
Use Scenario: Status illumination (power, charging, alert) alongside primary LCD backlight in portable test equipment. IC Role / Device Role / Timing Role: MAIN drives main backlight; SUB/FB powers discrete indicator LEDs; HWEN/PGEN/GPIO flashes indicators autonomously. Use Value: Offloads LED timing control from host MCU - extends battery life and simplifies firmware by eliminating periodic timer interrupts. |
Use Scenario: Edge-lit backlight for 10.1″–15.6″ industrial displays where thermal density and EMI must be minimized. IC Role / Device Role / Timing Role: Two LM3528TMX/NOPB units drive left/right backlight strings; I²C daisy-chaining enables synchronized dimming. Use Value: 90% peak efficiency at 40 mA total load reduces heat generation - avoids thermal throttling in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | Lacks integrated OLED regulation; adds ambient light sensor interface and 256-step dimming; same DSBGA-12 package. | Better suited for auto-brightness systems in sunlight-readable displays; not suitable when 18–21 V OLED bias is required. | Select LM3530TMX/NOPB only when ambient light adaptation is needed and OLED power integration is unnecessary. |
| TPS61165DRVR | Single-output boost LED driver; 30 V OVP; supports up to 40 mA; WSON-6 package; no I²C or GPIO features. | Requires external microcontroller for dimming control; lacks pattern generator or dual-string capability. | Choose TPS61165DRVR for cost-sensitive, single-string designs where firmware-driven control is acceptable and board space is constrained. |
Compared with LM3528TMX/NOPB, LM3530TMX/NOPB trades OLED integration for ambient light responsiveness, while TPS61165DRVR sacrifices multi-functionality and dual-channel precision for lower unit cost and simpler layout - making LM3528TMX/NOPB optimal for space-limited, feature-rich portable displays needing both LED and OLED bias.
Availability
LM3528TMX/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, OLED panel power supply, indicator LED + display combo, and large-format LCD backlighting requiring stable component supply across production lifecycles.
Supply support for LM3528TMX/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 ICs for industrial, automotive, and consumer applications.
The LM3528 product line targets ultra-compact, high-efficiency display power management in battery-powered portable electronics - delivering integrated LED bias, OLED voltage regulation, and intelligent peripheral control in sub-2 mm² packages.
FAQ
What is the maximum number of white LEDs the LM3528TMX/NOPB can drive per string?
The LM3528TMX/NOPB supports up to 6 series-connected white LEDs per string at 20 mA, assuming typical forward voltage of 3.2 V per LED and sufficient input voltage headroom. At VIN = 3.6 V, this corresponds to ~19.2 V total forward drop - within the 21 V output capability when SUB/FB is configured in OLED mode. The device's adaptive regulation ensures minimal excess voltage across current sinks to maximize efficiency.
How does the LM3528TMX/NOPB achieve 0.15% current matching between MAIN and SUB/FB outputs?
The LM3528TMX/NOPB achieves 0.15% typical current matching in unison mode (UNI bit = 1), where both MAIN and SUB/FB are controlled by the same BMAIN register value and share identical internal current reference paths. This eliminates independent DAC errors and leverages matched transistor geometry in the current-sink circuitry - verified across −40°C to +85°C operating temperature range per Electrical Characteristics table.
Can the LM3528TMX/NOPB drive an OLED panel and white LEDs simultaneously?
Yes - the LM3528TMX/NOPB can simultaneously drive a white LED string on MAIN while regulating a constant voltage on SUB/FB for OLED bias. In this configuration, SUB/FB acts as a 1.21 V feedback node, enabling up to 21 V output; MAIN remains a current sink with ≥300 mV headroom required for regulation. This dual-role operation is explicitly supported in the datasheet's OLED Mode section and Figure 37 block diagram.
What is the purpose of the SET pin on the LM3528TMX/NOPB, and how is it used?
The SET pin on the LM3528TMX/NOPB sets the full-scale LED current via an external resistor to GND: ILED_MAX = 192 × 1.244 V / RSET. With RSET = 12.1 kΩ, this yields 20 mA per string. The 1.244 V reference is trimmed and stable over temperature, ensuring accurate scaling of all 128 dimming steps. No calibration or trimming is required - the relationship is monotonic and specified across the full operating range.
Does the LM3528TMX/NOPB support hardware-based shutdown independent of I²C communication?
Yes - the LM3528TMX/NOPB supports true hardware shutdown via the HWEN/PGEN/GPIO pin when configured in Hardware Enable (HWEN) mode. Pulling this pin below 0.36 × VIO forces immediate shutdown: MAIN, SUB/FB, and SW enter high-impedance states, and all registers reset. This provides deterministic, glitch-immune power control - essential for safety-critical or low-power standby modes where I²C may be inactive.
LM3528TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 22V
- Current - Output / Channel:
- 20mA
- Frequency:
- 1.25MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM3528TMX/NOPB FAQ
1.How can I place an order for LM3528TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3528TMX/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 LM3528TMX/NOPB reliable?
The price and inventory of LM3528TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3528TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3528TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3528TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3528TMX/NOPB?
LM3528TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3528TMX/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 LM3528TMX/NOPB?
For technical support, including LM3528TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3528TMX/NOPB requirements.
6.How does Aetrix verify that LM3528TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3528TMX/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 LM3528TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3528TMX/NOPB?
All LM3528TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3528TMX/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 LM3528TMX/NOPB part is unused and in its original packaging.
Return procedure for LM3528TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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