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Texas Instruments LM3528TME/NOPB
- Part No.:
- LM3528TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3528TME/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LM3528TME/NOPB from Texas Instruments is a dual-output white LED bias supply with integrated OLED power supply, configured as a current-mode boost converter delivering up to 20 mA per string on MAIN and SUB/FB outputs, supporting 2.7V–5.5V input, 1.25 MHz fixed switching frequency, and 1% current matching-used in portable LCD backlighting with indicator LED control.
For engineers reviewing the LM3528TME/NOPB datasheet, LM3528TME/NOPB pinout, LM3528TME/NOPB application, or LM3528TME/NOPB equivalent, key selection considerations include I²C-programmable 128-step exponential dimming, adaptive output voltage regulation for efficiency, OVP threshold at 22 V, dual-mode operation (LED+LED or LED+OLED), and DSBGA-12 package compatibility with space-constrained display subsystems.
Technical Context
The LM3528TME/NOPB implements a current-mode PWM boost architecture with internal 770 mA peak switch current limit and 1.25 MHz fixed-frequency oscillator. It supports two independent regulation paths: MAIN as constant-current sink (up to 20 mA), and SUB/FB configurable either as second current sink or 1.21 V feedback input for OLED voltage regulation up to 21 V.
Adaptive regulation dynamically adjusts output voltage to maintain minimum 500 mV headroom across both current sinks in dual-LED mode, while unison/non-unison control modes enable trade-offs between independent brightness tuning (±1% matching) and ultra-tight current tracking (±0.15%). Hardware enable, pattern generator, and GPIO functions are managed via the multi-function HWEN/PGEN/GPIO pin under I²C register control.
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 external RSET; enables driving up to 6 series white LEDs per channel. |
| Current Matching Accuracy | 1% (non-unison), 0.15% (unison) - ensures uniform luminance across dual backlight strings without optical compensation. |
| OVP Threshold | 22 V (typ.) - protects external capacitors and LEDs during open-circuit or load-dump conditions. |
| Switching Frequency | 1.25 MHz (fixed) - allows use of compact 1 µH inductors and minimizes audible noise in handheld displays. |
| I²C Dimming Resolution | 128 exponential steps - provides perceptually linear brightness control over full 0–100% range with minimal register writes. |
| Package | 12-bump DSBGA (1.215 mm × 1.615 mm × 0.6 mm) - enables ultra-thin bezel integration in smartphones and wearables. |
Pinout & Package
LM3528TME/NOPB uses a 12-bump DSBGA package (1.215 mm × 1.615 mm × 0.6 mm) with bottom-side solder balls. Pin mapping follows TI's YFQ0012 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | OVP | Over-voltage protection sense - connects directly to output capacitor anode to trigger shutdown if VOUT exceeds 22 V. |
| A2 | MAIN | Main current sink output - delivers regulated current to first white LED string; requires external cathode connection. |
| A3 | SUB/FB | Secondary current sink or feedback input - configures as second LED sink or 1.21 V reference input for OLED voltage regulation. |
| B1 | GPIO1 | Dedicated open-drain general-purpose I/O - programmable as input/output for status signaling or external control. |
| B2 | SCL | I²C serial clock input - referenced to VIO; supports standard/fast-mode timing with 2.5 µs min period. |
| B3 | SET | Current setting reference - connects external resistor to GND to set max ILED = 192 × 1.244 V / RSET. |
| C1 | HWEN/PGEN/GPIO | Multi-function pin - hardware enable input (active-high), 32-bit pattern generator output, or GPIO under register control. |
| C2 | SDA | I²C bidirectional data line - open-drain, level-shifted to VIO, supports read/write of all configuration registers. |
| C3 | IN | Main power input - bypassed with 1 µF ceramic capacitor; accepts 2.7–5.5 V with internal UVLO at 2.5 V. |
| D1 | VIO | I²C logic voltage reference - sets SCL/SDA high/low thresholds; independent of IN supply (1.7–5.5 V range). |
| D2 | SW | Internal NMOS switch drain - connects to external inductor and Schottky diode; rated for 25 V max voltage stress. |
| D3 | GND | Analog/digital ground - common reference for all internal circuits and external passive components. |
Key Features
| Feature | Design Value |
|---|---|
| 128-step exponential dimming | Enables perceptually uniform brightness scaling from 0.1% to 100% with single register write per channel. |
| Programmable auto-dimming | Responds to ambient light sensor input via GPIO or I²C to reduce power consumption in low-light environments. |
| True shutdown isolation | Disconnects MAIN, SUB/FB, and SW from internal circuitry during shutdown - eliminates leakage current into LED strings. |
| Integrated soft-start | Ramps average input current from 0 to 450 mA in ~1.2 ms - prevents input rail droop and EMI spikes at power-on. |
| Dedicated pattern generator | Outputs user-defined 32-bit sequences at selectable frequencies/duty cycles on HWEN/PGEN/GPIO for LED blinking or system signaling. |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Dual-string white LED backlight for 4.3"–7" smartphone or tablet LCD panels with dynamic contrast enhancement. IC Role / Device Role / Timing Role: Constant-current driver regulating two independent LED strings with synchronized or unison dimming via I²C interface. Use Value: 1% current matching ensures consistent color temperature and eliminates visible banding; adaptive voltage regulation maintains >90% efficiency across varying LED forward voltages. | Use Scenario: Combined white LED backlight + 18 V OLED display panel in foldable device main screen. IC Role / Device Role / Timing Role: MAIN drives LED string at 20 mA while SUB/FB operates in feedback mode to regulate 18 V OLED supply with ±1.2% accuracy. Use Value: Single-chip solution reduces BOM count and PCB area; 22 V OVP protects OLED panel during transient overvoltage events. |
| Indicator LED Control | Large Format Display Backlight |
Use Scenario: Status indicator lighting (power-on, charging, notification) alongside primary display in smartwatch or AR glasses. IC Role / Device Role / Timing Role: HWEN/PGEN/GPIO pin configured as 32-bit pattern generator to drive discrete indicator LED with custom blink sequence. Use Value: Eliminates need for separate LED flasher IC; programmable duty cycle/frequency enables unique brand-specific visual signatures. | Use Scenario: Dual-channel backlight for 10.1" industrial HMI display requiring high reliability and thermal stability. IC Role / Device Role / Timing Role: MAIN and SUB/FB each drive 5-series white LEDs at 20 mA with unison mode enabled for <0.15% current mismatch across temperature. Use Value: Tight current matching preserves uniform luminance over -40°C to +85°C operating range; DSBGA package withstands reflow and mechanical shock. |
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 |
|---|---|---|---|
| TPS61165DRVR | Single-output boost LED driver with 1.2 MHz switching, no SUB/FB OLED mode, no I²C interface - uses analog dimming only. | Limited to single-string backlighting; lacks pattern generator, GPIO, and dual-mode flexibility. | Select when cost-sensitive designs require only basic LED bias without OLED support or digital control. |
| MAX16832ATP+ | High-voltage boost controller (up to 36 V) with external MOSFET; supports up to 120 mA total output but no integrated current sinks or I²C. | Requires external power stage and discrete current sensing; suited for high-power automotive or industrial lighting. | Select when driving >6-series LEDs or needing >21 V output; not suitable for space-constrained portable devices. |
Compared with TPS61165DRVR and MAX16832ATP+, the LM3528TME/NOPB uniquely integrates dual current sinks, OLED voltage regulation, I²C dimming, and pattern generation in a 1.2 mm × 1.6 mm package-making it optimal for compact, feature-rich display subsystems where board area and multifunctionality are critical.
Availability
LM3528TME/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, OLED panel power supply, indicator LED control, and large-format display backlighting requiring stable component supply and long-term production continuity.
Supply support for LM3528TME/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, designing and manufacturing analog and embedded processing products used in industrial, automotive, personal electronics, and communications systems.
The LM3528TME/NOPB belongs to TI's display power management IC portfolio, engineered specifically for ultra-compact, high-efficiency backlight and OLED bias solutions in battery-powered portable devices.
FAQ
What is the maximum number of white LEDs the LM3528TME/NOPB can drive per string?
The LM3528TME/NOPB supports up to 6 series white LEDs per string on both MAIN and SUB/FB outputs when configured in dual-LED mode. This assumes typical forward voltage of ~3.3 V per LED and 20 mA current, resulting in ~20 V total string voltage - within the 22 V OVP limit and compatible with the device's adaptive regulation capability. The LM3528TME/NOPB datasheet confirms this rating under "Drives up to 12 LED's at 20mA" (6 per channel).
Does the LM3528TME/NOPB support true shutdown isolation for the LED strings?
Yes, the LM3528TME/NOPB provides true shutdown isolation: during shutdown, MAIN, SUB/FB, and SW terminals enter high-impedance state, eliminating leakage current into connected LED strings. This is confirmed in the "Features" section of the LM3528TME/NOPB datasheet ("True Shutdown Isolation for LED's") and verified in the Electrical Characteristics table where shutdown current is specified at 1.8–3 µA with ENM = ENS = OLED = '0'.
How is LED current accuracy set and trimmed in the LM3528TME/NOPB?
LED current accuracy in the LM3528TME/NOPB is set by an external resistor connected from SET to GND, where ILED_MAX = 192 × 1.244 V / RSET. The 1.244 V reference is trimmed at wafer test, yielding ±1% current matching between MAIN and SUB/FB in non-unison mode and ±0.15% in unison mode. These values are measured and guaranteed across –40°C to +85°C per the LM3528TME/NOPB Electrical Characteristics table (ILED-MATCH parameter).
Can the LM3528TME/NOPB drive an OLED panel while simultaneously powering a white LED backlight?
Yes, the LM3528TME/NOPB supports concurrent operation in OLED mode: MAIN acts as a constant-current sink for up to 6-series white LEDs at 20 mA, while SUB/FB functions as the feedback input to regulate a constant output voltage up to 21 V for the OLED panel. The LM3528TME/NOPB datasheet explicitly states this capability in the "Description" and "Applications" sections, and Figure 37's block diagram shows dedicated error amplifier paths for both configurations.
What package type and dimensions does the LM3528TME/NOPB use?
The LM3528TME/NOPB uses a 12-bump DSBGA (Die Size Ball Grid Array) package designated YFQ0012, measuring 1.215 mm × 1.615 mm × 0.6 mm. This ultra-low-profile package is optimized for thin portable devices and is documented in the LM3528TME/NOPB datasheet "Connection Diagram" (Figure 3) and "Thermal Properties" section, with JEDEC-compliant thermal resistance (θJA = 68°C/W).
LM3528TME/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
LM3528TME/NOPB FAQ
1.How can I place an order for LM3528TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3528TME/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 LM3528TME/NOPB reliable?
The price and inventory of LM3528TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3528TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM3528TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3528TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3528TME/NOPB?
LM3528TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3528TME/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 LM3528TME/NOPB?
For technical support, including LM3528TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3528TME/NOPB requirements.
6.How does Aetrix verify that LM3528TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3528TME/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 LM3528TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM3528TME/NOPB?
All LM3528TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3528TME/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 LM3528TME/NOPB part is unused and in its original packaging.
Return procedure for LM3528TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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