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Texas Instruments LM3538TMX/NOPB
- Part No.:
- LM3538TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 30-WFBGA, DSBGA
- Datasheet:
-
LM3538TMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 30DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,881
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Product details
Overview
LM3538TMX/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 25 mA per LED channel 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. It operates from 2.7V–5.5V input and achieves up to 90% efficiency via adaptive 1×/1.5× charge pump.
For engineers reviewing the LM3538TMX/NOPB datasheet, LM3538TMX/NOPB pinout, LM3538TMX/NOPB application, or LM3538TMX/NOPB equivalent, this page provides verified technical context on its dual-group LED current regulation, integrated 300mA/150mA LDOs, ALS-driven autonomous brightness control, PWM-based CABC support, and 30-bump DSBGA package layout - all critical for mobile display power architecture validation.
Technical Context
The LM3538TMX/NOPB implements an adaptive CMOS charge pump with automatic 1×/1.5× gain selection based on LED forward voltage and VOUT headroom requirements, maintaining current regulation while maximizing efficiency across 2.7V–5.5V input range. Its dual-group current sink architecture features ±7.5% output current regulation (Group A and Group B) and ≤3% LED current matching within each group.
It embeds a full ambient light sensing subsystem with programmable zone boundaries (4 thresholds), 5-zone target mapping, configurable averaging time (8 settings), and hardware-controlled sensor gain switching via GPO1/GPO2 pins. The I²C interface (400 kHz compliant) configures all registers including LDO output voltages (1.2V–3.3V), dimming curves, ALS parameters, and enable states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Driver Channels | 6 total: Group A (6 sinks), Group B (2 sinks); enables independent main/sub-display backlight control |
| Max Output Current | 150 mA total (25 mA per sink max); requires thermal derating above 85°C ambient |
| Dimming Resolution | Group A: 128-step (exponential or linear); Group B: 8-step linear; enables fine-grained brightness tuning |
| LDO Outputs | 1 × 300 mA (LDO1), 3 × 150 mA (LDO2–LDO4); all programmable 1.2V–3.3V via I²C |
| Charge Pump Efficiency | Up to 90% at 3.6V input; achieved via adaptive 1×/1.5× gain mode selection without inductor |
| ALS Interface | Single-pin analog input (ALS) with internal 0.651kΩ–20.2kΩ programmable resistor bank; supports ROHM BH16xx sensors |
| Operating Voltage | VIN_A/VIN_B: 2.7V–5.5V; VIN_C: 1.8V–VIN_B; supports direct battery or post-buck rail supply |
Pinout & Package
LM3538TMX/NOPB uses a 30-bump DSBGA package (YFQ0030), 2.13 mm × 1.73 mm, 0.4 mm pitch, bottom-side solder balls. Thermal resistance θJA = 45°C/W. Requires PCB thermal pad under die for optimal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A | Main power input | Supplies LED driver, ALS interface, and internal logic; 2.7V–5.5V range |
| VOUT | Charge pump output | Regulated high-voltage rail for LED anodes; auto-switches between 1×/1.5× gain |
| D1–D6 | LED current sinks | Group A (D1–D6) and Group B (D1–D2) sinks; common-anode configuration |
| LDO1–LDO4 | Regulated outputs | LDO1: 300 mA max; LDO2–LDO4: 150 mA max; all voltage-programmable via I²C |
| SCL/SDA | I²C interface | Standard 400 kHz bus; enables full register configuration and status readback |
| PWM | External dimming control | Direct pulse-width modulation input for CABC; min. 15 µs on-time required |
| ALS | Ambient light sensor input | Analog voltage input (0–1 V); used with external photodiode and internal RALS bank |
| INT | ALS interrupt output | Open-drain active-low signal indicating ALS zone transition or threshold crossing |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive charge pump | Automatically selects 1× or 1.5× gain to maintain LED current regulation while maximizing efficiency across input/LED VF variation |
| Dual-group LED control | Independent dimming of Group A (6 LEDs) and Group B (2 LEDs) enables simultaneous main display + keypad/sub-display illumination |
| Integrated ALS engine | Configurable 4-zone ambient light detection with 5-target brightness mapping, 8 averaging time options, and noise-rejecting discriminator block |
| Programmable LDOs | Four fully configurable regulators: one 300 mA (LDO1), three 150 mA (LDO2–LDO4); each supports 1.2V–3.3V output via I²C register write |
| Hardware-assisted sensor gain | GPO1/GPO2 pins automatically switch external sensor gain (e.g., ROHM BH1621FVC) between high/low modes based on ambient intensity |
Applications
| Smartphone Main Display Backlight | Tablet Sub-Display Illumination |
|---|---|
Use Scenario: Driving 6 parallel white LEDs behind an LCD panel in a 5–7 inch smartphone display. IC Role / Device Role / Timing Role: Primary WLED driver providing constant-current sink regulation, I²C-configurable dimming, and ALS-adaptive brightness scaling. Use Value: Enables seamless ambient-adaptive backlighting with <3% current mismatch across LEDs, preserving uniform luminance and extending battery life via 90% efficient charge pump. |
Use Scenario: Powering 2 white LEDs for secondary display (e.g., front-facing camera UI, notification bar) in dual-screen tablets. IC Role / Device Role / Timing Role: Secondary LED driver group (Group B) operating independently from main display, supporting 8-step linear dimming synchronized via same I²C bus. Use Value: Reduces BOM count by eliminating separate sub-display driver IC; leverages shared ALS engine and charge pump resources without performance trade-off. |
| Digital Camera LCD Viewfinder | Portable Gaming Device Backlight |
Use Scenario: Illuminating small-format TFT LCD viewfinder (2–3 inch) requiring rapid brightness response to scene lighting changes. IC Role / Device Role / Timing Role: ALS-driven autonomous backlight controller with <1.6 s latency from ambient change to LED current adjustment (configurable down to ~200 ms). Use Value: Delivers real-time viewfinder visibility adaptation using internal averaging and zone-mapping logic-no host MCU intervention required. |
Use Scenario: Backlighting high-refresh-rate OLED/LCD panels in handheld gaming devices where dynamic content-aware dimming (CABC) is critical. IC Role / Device Role / Timing Role: PWM-input-enabled driver accepting external CABC signals from display controller to modulate Group A LED current synchronously with frame content. Use Value: Achieves >30% power reduction during dark-scene playback while maintaining flicker-free operation via 15 µs minimum PWM pulse compliance. |
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 |
|---|---|---|---|
| TPS61165DRVR | Single-group 5-channel driver (no Group B); no integrated LDOs; requires external regulators for sensor/camera rails | Lacks ALS engine, GPOs, and multi-rail LDOs; suitable only for basic backlight-only designs | Choose when system already provides dedicated LDOs and does not require ambient light adaptation or sub-display control |
| RT8532GQW | 6-channel driver with 12-bit dimming but no ALS interface or programmable LDOs; uses external resistor-based current setting | No autonomous ambient control; fixed LDO outputs (not I²C-programmable); limited to static backlight configurations | Select if I²C configurability and sensor integration are unnecessary and cost-sensitive BOM optimization is primary goal |
Compared with TPS61165DRVR and RT8532GQW, LM3538TMX/NOPB uniquely combines dual-group LED control, embedded ALS with hardware gain switching, and four programmable LDOs in one DSBGA package-enabling single-chip display power management for feature-rich portable devices without compromising flexibility or efficiency.
Availability
LM3538TMX/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, tablet sub-display illumination, digital camera viewfinders, and portable gaming device displays requiring stable component supply and long-term production continuity.
Supply support for LM3538TMX/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 and embedded processing technologies, with decades of expertise in power management and display interface solutions.
The LM3538TMX/NOPB belongs to TI's portable display power management product line, engineered specifically for space-constrained mobile devices requiring integrated WLED driving, ambient light adaptation, and point-of-load regulation in a single chip.
FAQ
What is the maximum total output current supported by the LM3538TMX/NOPB?
The LM3538TMX/NOPB supports a maximum total output current of 150 mA, distributed across its six LED current sinks. Group A (D1–D6) can deliver up to 25 mA per channel (150 mA total), while Group B (D1–D2) shares the same current limit - meaning simultaneous full-scale operation of both groups requires careful thermal and voltage headroom management. The datasheet specifies that under maximum load, VIN_A must be ≥3.2V and VLED ≤3.6V to ensure regulation integrity.
How does the LM3538TMX/NOPB handle ambient light sensing without an external ADC?
The LM3538TMX/NOPB integrates a dedicated ALS subsystem that digitizes ambient light input directly: the ALS pin accepts analog voltage (0–1 V) from a photodiode, compares it against four user-programmed zone boundary thresholds (via 8-bit registers), and maps results to five target LED brightness levels. Internal 16 kHz sampling, configurable averaging (8 time options), and noise-rejecting discriminator logic eliminate need for host MCU ADC involvement - enabling fully autonomous backlight adaptation.
Can the LDO outputs of the LM3538TMX/NOPB be used to power external camera modules?
Yes - the LM3538TMX/NOPB's LDO1 (300 mA, 1.2V–3.3V) and LDO2–LDO4 (150 mA each, 1.2V–3.3V) are explicitly designed for point-of-load regulation of peripherals like camera modules, image sensors, or touch controllers. Each LDO's output voltage is set independently via I²C register writes, and startup sequencing (70 µs per LDO after first) ensures controlled power-up. The SBIAS pin also provides 20 mA at 2.4 V or 3.0 V for ambient light sensor biasing.
What is the purpose of the GPO1 and GPO2 pins on the LM3538TMX/NOPB?
GPO1 and GPO2 on the LM3538TMX/NOPB serve dual roles: as general-purpose open-drain outputs (default) or as hardware-controlled sensor gain select lines. When autogain_en is enabled, they automatically toggle between HIGH/LOW states to switch external ambient light sensors (e.g., ROHM BH1621FVC) between high-gain and low-gain modes - extending dynamic range from <1 lux to >10,000 lux without host intervention or software polling.
Does the LM3538TMX/NOPB support both linear and exponential dimming curves?
Yes - the LM3538TMX/NOPB supports selectable dimming curves per group: Group A (6 LEDs) offers user-configurable exponential or linear 128-step dimming via register setup, while Group B (2 LEDs) uses fixed 8-step linear dimming. This allows precise perceptual brightness control for main displays (exponential matches human eye response) and simpler stepwise control for auxiliary indicators or sub-displays.
LM3538TMX/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
LM3538TMX/NOPB FAQ
1.How can I place an order for LM3538TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3538TMX/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 LM3538TMX/NOPB reliable?
The price and inventory of LM3538TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3538TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3538TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3538TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3538TMX/NOPB?
LM3538TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3538TMX/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 LM3538TMX/NOPB?
For technical support, including LM3538TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3538TMX/NOPB requirements.
6.How does Aetrix verify that LM3538TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3538TMX/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 LM3538TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3538TMX/NOPB?
All LM3538TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3538TMX/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 LM3538TMX/NOPB part is unused and in its original packaging.
Return procedure for LM3538TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3538TMX/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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