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Texas Instruments LM3538TME/NOPB
- Part No.:
- LM3538TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 30-WFBGA, DSBGA
- Datasheet:
-
LM3538TME/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 30DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LM3538TME/NOPB from Texas Instruments is a 6-channel WLED driver with four integrated LDOs, designed for smartphone and portable display backlighting. It delivers up to 25mA per LED across two independently controlled groups (Group A: 6 LEDs, Group B: 2 LEDs), supports I²C-configurable dimming (128 exponential/linear steps for Group A, 8 linear steps for Group B), and integrates an ambient light sensing engine with ALS interrupt output. Its adaptive 1×/1.5× charge pump achieves up to 90% efficiency without inductors.
For engineers reviewing the LM3538TME/NOPB datasheet, LM3538TME/NOPB pinout, LM3538TME/NOPB application, or LM3538TME/NOPB equivalent, key selection considerations include its 30-bump DSBGA package, dual-group LED current matching (±3%), programmable LDO outputs (1.2–3.3V, 150mA/300mA), ALS-based autonomous brightness control, and PWM input for CABC-compatible dynamic backlight adjustment.
Technical Context
The LM3538TME/NOPB implements an adaptive charge pump operating in 1× or 1.5× gain mode to maintain VOUT regulation at ~4.2V while minimizing power loss across varying LED forward voltages (2.0–4.0V) and input supply (2.7–5.5V). Its dual-group current sink architecture uses precision current mirrors with internal mismatch cancellation to achieve ≤3% inter-LED current matching within each group.
Integrated ambient light sensing includes a configurable 5-zone ALS engine with programmable boundary registers (ZB0–ZB3), 8 selectable averaging times, and automatic gain switching via GPO1/GPO2 for sensors like ROHM BH1621FVC. Four LDOs are individually enabled/disabled and voltage-programmed via I²C, with LDO1 supporting 300mA at ≤300mV dropout and LDO2–LDO4 rated for 150mA at ≤200mV dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and regulated system rails without external level shifting |
| LED Output Current | 25mA per channel (Group A & B) - enables uniform brightness across 6+2 parallel WLEDs in common-anode configuration |
| Dimming Resolution | 128-step (Group A, exp/lin selectable) + 8-step (Group B, linear) - provides fine-grained backlight control for content-aware dimming |
| LDO Outputs | 1× 300mA (LDO1), 3× 150mA (LDO2–LDO4), 1.2–3.3V programmable - supplies camera modules, sensors, or logic with point-of-load regulation |
| Charge Pump Efficiency | Up to 90% - eliminates need for magnetic components while maintaining high conversion efficiency across load and input range |
| Ambient Light Sensing | 5-zone ALS with auto-gain switching and interrupt output - enables autonomous, low-power display brightness adaptation without host CPU intervention |
| I²C Interface | Standard-mode (400kHz max), 7-bit address - allows full register configuration including dimming curves, zone boundaries, and LDO settings |
Pinout & Package
LM3538TME/NOPB is housed in a 30-bump DSBGA package (2.15 mm × 1.75 mm, 0.4 mm pitch), optimized for ultra-thin mobile designs. Thermal resistance θJA = 45°C/W enables operation up to +85°C ambient with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A | Main supply input | Power source for charge pump, ALS interface, and logic; 2.7–5.5V range |
| VOUT | Charge pump output | Regulated ~4.2V rail driving all six LED current sinks |
| D1–D6 | LED current sink outputs | Group A (D1–D6) and Group B (D1–D2) support independent dimming and current control |
| LDO1–LDO4 | Programmable LDO outputs | LDO1: 300mA max; LDO2–LDO4: 150mA max; all adjustable 1.2–3.3V via I²C |
| ALS | Ambient light sensor input | Analog input for photodiode; internally referenced to 1.0V with programmable RALS (0.65–20.2 kΩ) |
| INT | ALS interrupt output | Open-drain signal indicating zone transition; requires external pull-up |
| SCL/SDA | I²C interface | Standard 2-wire serial bus for full device configuration and status readback |
| PWM | External dimming control | Direct pulse-width modulation input for CABC-compliant dynamic backlight control |
| HWEN | Hardware enable | Active-high reset; forces shutdown when pulled low |
| GPO1/GPO2 | General-purpose outputs | Configurable as open-drain or push-pull; used for sensor gain control in auto-gain mode |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1×/1.5× charge pump | Automatically selects gain mode based on LED VF and input voltage to maximize efficiency without inductor |
| Two independent LED groups | Group A (6 channels) and Group B (2 channels) allow simultaneous main display + keypad/sub-display illumination |
| ALS with 5-zone auto-brightness | Configurable ambient light thresholds and target brightness levels enable seamless, low-power display adaptation |
| Four programmable LDOs | Individually controllable 1.2–3.3V outputs eliminate need for discrete regulators in camera/sensor power domains |
| I²C + PWM dual dimming interface | Enables both software-controlled static brightness and hardware-triggered dynamic content-aware dimming |
| Low quiescent current | 1.2 µA standby and 0.2–1.0 µA shutdown current extend battery life in always-on sensor applications |
Applications
| Smartphone Main Display Backlight | Tablet Sub-Display Backlight |
|---|---|
Use Scenario: Driving 6 parallel white LEDs for primary LCD backlight in compact smartphones with battery-powered operation. IC Role / Device Role / Timing Role: WLED driver with adaptive charge pump and ALS-based autonomous brightness control. Use Value: Delivers uniform illumination while reducing average power consumption by up to 40% via ambient-adaptive dimming and 90%-efficient charge pump operation. |
Use Scenario: Illuminating secondary display (e.g., front-facing camera preview, notification bar) using 2 dedicated LEDs. IC Role / Device Role / Timing Role: Secondary LED driver group (Group B) with independent 8-step linear dimming control. Use Value: Enables low-power, context-aware sub-display lighting without requiring additional driver ICs or MCU overhead. |
| Mobile Camera Module Power | ALS-Enabled Wearable Display |
Use Scenario: Providing regulated 2.8V/300mA power to image sensor and ISP in smartphone camera subsystems. IC Role / Device Role / Timing Role: Integrated LDO1 supplying point-of-load power with <300mV dropout at full load. Use Value: Eliminates discrete LDO, reduces BOM count, and improves power delivery efficiency versus switching solutions at low output voltages. |
Use Scenario: Adaptive brightness control for OLED displays in smartwatches under variable ambient lighting (indoor/outdoor). IC Role / Device Role / Timing Role: Ambient light sensing engine with 5-zone mapping and 800ms configurable averaging time. Use Value: Ensures readable display luminance across 0.1–1000 lux while minimizing false triggers from transient light changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver with integrated LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3532TME/NOPB | 4-channel WLED driver (no Group B), no integrated ALS engine, same 30-bump DSBGA package | Lacks ambient light sensing and auto-brightness; suitable only for fixed-brightness or externally controlled systems | Select when ALS functionality is unnecessary and fewer LEDs are required |
| TPS61165DRVR | 6-channel WLED driver with boost converter (inductor-based), no integrated LDOs or ALS | Higher peak efficiency at low input voltages but requires external inductor and lacks multi-rail regulation | Select when higher input-to-output voltage ratio (>2×) is needed and board space permits inductor placement |
Compared with LM3538TME/NOPB, LM3532TME/NOPB reduces integration (no ALS, no Group B, no LDOs) for cost-sensitive fixed-brightness designs, while TPS61165DRVR trades inductor-free operation and LDO integration for higher boost efficiency in low-VIN scenarios - neither offers the combined ALS + dual-group + quad-LDO capability of LM3538TME/NOPB.
Availability
LM3538TME/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, portable display power management, and ambient-light-adaptive wearable electronics requiring stable component supply and long-term production continuity.
Supply support for LM3538TME/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 technologies, with decades of expertise in portable power and display solutions.
The LM3538TME/NOPB belongs to TI's high-integration portable LED driver product line, engineered specifically for space-constrained mobile devices requiring combined backlight control, sensor power, and ambient light adaptation in a single chip.
FAQ
What is the maximum total LED current supported by the LM3538TME/NOPB?
The LM3538TME/NOPB supports a maximum total output current of 150mA, distributed across its six LED drivers. Group A (D1–D6) can deliver up to 25mA per channel (150mA total if all six are active), while Group B (D1–D2) is limited to 25mA per channel. In practice, the datasheet specifies that under maximum output conditions, the total current should be limited to 150mA to ensure proper current regulation and thermal stability. The LM3538TME/NOPB enforces this via internal current limiting and thermal shutdown at 160°C.
How does the LM3538TME/NOPB implement ambient light sensing without an external ADC?
The LM3538TME/NOPB integrates a dedicated ALS engine with an internal 8-bit ADC, programmable averaging circuit (8 selectable time constants), and discriminator block. It accepts analog voltage from a photodiode connected to the ALS pin, compares it against four user-defined zone boundary registers (ZB0–ZB3), and autonomously adjusts LED brightness to one of five preconfigured target levels. No external ADC or host processor intervention is required for basic zone-based adaptation - the LM3538TME/NOPB handles sampling, filtering, threshold comparison, and current sink reconfiguration internally.
Can the LDO outputs of the LM3538TME/NOPB be powered from different input rails?
No - all LDOs (LDO1–LDO4) share the same input voltage domain: VIN_C must be supplied from a single rail between 1.8V and VIN_A (max 5.5V), and VIN_C must remain ≥ VOUT_LDO + 0.3V. However, VIN_C may be derived from the main battery (VIN_A) or from a separate buck converter output, enabling flexible power architecture. LDO1–LDO4 outputs are individually programmable (1.2–3.3V) and controllable via I²C, but their input source is common and externally supplied - the LM3538TME/NOPB does not generate VIN_C internally.
What is the purpose of the SBIAS pin on the LM3538TME/NOPB?
The SBIAS pin on the LM3538TME/NOPB provides a regulated 2.4V or 3.0V bias supply (selectable via register) with up to 20mA output current, specifically intended to power ambient light sensors such as photodiodes or integrated ALS ICs (e.g., ROHM BH1621FVC). It eliminates the need for a separate sensor bias rail and ensures stable, low-noise excitation for accurate ambient light measurement. When unused, SBIAS should be left unconnected - the LM3538TME/NOPB disables this output automatically if not configured.
Does the LM3538TME/NOPB support true PWM dimming on individual LED channels?
No - the LM3538TME/NOPB does not support per-channel PWM dimming. Its PWM pin provides global, hardware-based on/off control of all enabled LED current sinks at externally applied frequency and duty cycle (minimum on-time 15µs). Dimming resolution is achieved digitally via I²C-programmed current levels: 128 steps for Group A (exponential or linear), 8 linear steps for Group B. The PWM input is intended for system-level CABC (Content Adaptive Brightness Control) synchronization, not fine-grained channel-specific pulse-width modulation.
LM3538TME/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2V ~ 4V
- Current - Output / Channel:
- 25mA
- Frequency:
- 1.3MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-DSBGA
LM3538TME/NOPB FAQ
1.How can I place an order for LM3538TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3538TME/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 LM3538TME/NOPB reliable?
The price and inventory of LM3538TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3538TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM3538TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3538TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3538TME/NOPB?
LM3538TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3538TME/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 LM3538TME/NOPB?
For technical support, including LM3538TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3538TME/NOPB requirements.
6.How does Aetrix verify that LM3538TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3538TME/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 LM3538TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM3538TME/NOPB?
All LM3538TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3538TME/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 LM3538TME/NOPB part is unused and in its original packaging.
Return procedure for LM3538TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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