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Texas Instruments LM3537TMX/NOPB
- Part No.:
- LM3537TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 30-WFBGA, DSBGA
- Datasheet:
-
LM3537TMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 30DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3537TMX/NOPB from Texas Instruments is an 8-channel WLED driver with four integrated LDOs, designed for smartphone and portable display backlighting. It delivers up to 25 mA per channel across two independently dimmable groups (Group A: 128-step exponential/linear; Group B: 8-step linear), operates from 2.7V–5.5V input, integrates ambient light sensing with automatic gain control, and supports I²C configuration and external PWM dimming.
For engineers reviewing the LM3537TMX/NOPB datasheet, LM3537TMX/NOPB pinout, LM3537TMX/NOPB application, or LM3537TMX/NOPB equivalent, key selection considerations include its adaptive 1×/1.5× charge pump efficiency (up to 90%), integrated ALS engine with five-zone ambient adaptation, programmable LDO outputs (LDO1: 300 mA @ 1.2–3.3 V; LDO2–LDO4: 150 mA each), and 30-bump DSBGA package compatibility with space-constrained mobile designs.
Technical Context
The LM3537TMX/NOPB implements a closed-loop adaptive charge pump with automatic 1×/1.5× gain switching based on LED forward voltage and VOUT regulation target (4.2 V typ.), enabling high efficiency without inductors. Its dual-group current sink architecture uses precision-matched internal current mirrors (±0.8% typical matching) with independent digital control via I²C registers.
Integrated ambient light sensing includes configurable zone boundaries (ZB0–ZB3), 8-level averaging, and hardware-controlled GPO1/GPO2 gain switching for sensors like ROHM BH1621FVC. The four LDOs are individually enabled/disabled and voltage-programmable (1.2–3.3 V) through the same I²C interface, sharing VIN_C (1.8–VIN_A) as input rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - Supports single-cell Li-ion and regulated 3.3 V/5 V rails without external level shifting. |
| LED Output Channels | 8 total - Group A (D1–D8): 128-step dimming; Group B (D1–D4): 8-step linear dimming; enables main + sub-display backlight control. |
| Charge Pump Efficiency | Up to 90% - Achieved via adaptive 1×/1.5× gain mode selection, eliminating need for inductor-based solutions. |
| LDO Outputs | 4 total: LDO1 (300 mA), LDO2–LDO4 (150 mA each) - Programmable 1.2–3.3 V outputs support camera modules, sensors, or RF ICs. |
| Ambient Light Sensing | 5-zone ALS engine with auto-gain - Uses internal 10.1 kΩ/5.0 kΩ resistor options and GPO1/GPO2 hardware gain control for wide dynamic range (e.g., 0–1000 lux). |
| Interface | I²C-compatible (400 kHz fast-mode) - Enables full configuration of dimming curves, zone boundaries, LDO voltages, and ALS parameters. |
| Package | 30-bump DSBGA (2.13 mm × 1.73 mm, 0.4 mm pitch) - Ultra-compact footprint for thin mobile PCBs with minimal thermal resistance (θJA = 45°C/W). |
Pinout & Package
The LM3537TMX/NOPB is housed in a 30-bump DSBGA package with 0.4 mm pitch and 2.13 mm × 1.73 mm body size. Thermal performance is optimized via exposed die attach pad (PGND bump A2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A | Main power input | Supplies charge pump, ALS interface, and logic; 2.7–5.5 V range with internal overvoltage protection. |
| D1–D8 | LED current sinks | Eight constant-current outputs; D1–D4 = Group B (8-step); D5–D8 = Group A (128-step); common-anode LED connection. |
| VOUT | Charge pump output | Regulated output (4.2 V typ.) driving all LED sinks; requires external flying capacitors C1+/C1− and C2+/C2−. |
| SCL/SDA | I²C interface | Standard bidirectional bus (400 kHz) for register read/write; supports address 0x36 (7-bit) with HWEN pull-up default. |
| ALS | Ambient light sensor input | Analog input (0–1 V range) for photodiode; internally referenced to 1.0 V; interrupt-capable via D7/INT pin when zone boundary crossed. |
| LDO1–LDO4 | Programmable LDO outputs | LDO1: 300 mA max, 100 mV dropout at 300 mA; LDO2–LDO4: 150 mA max, 100 mV dropout at 150 mA; all voltage-programmable via I²C. |
| GPO1/GPO2 | General-purpose outputs | Configurable as open-drain (default) or push-pull; used for sensor gain control (e.g., ROHM BH1621FVC) or system signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1×/1.5× charge pump | Automatically selects gain mode to maintain VOUT regulation and maximize efficiency across input voltage and LED VF variations. |
| Independent dual-group dimming | Group A (8 channels) supports 128-step exponential or linear dimming; Group B (4 channels) supports 8-step linear dimming - enables simultaneous main display and keypad illumination control. |
| Integrated 5-zone ALS engine | Configurable ambient light thresholds (ZB0–ZB3) and target brightness (Zone 0–4) enable autonomous backlight adaptation without host MCU intervention. |
| Four programmable LDOs | LDO1 (300 mA) and LDO2–LDO4 (150 mA each) provide point-of-load regulation; output voltages set via I²C (1.2–3.3 V in 50 mV steps) with ±2% accuracy. |
| Hardware PWM dimming input | PWM pin accepts external 15 µs minimum pulse width signals to override I²C dimming - supports content-adaptive backlight control (CABC) in display drivers. |
Applications
| Smartphone Main Display Backlight | MP3 Player Keypad Illumination |
|---|---|
Use Scenario: Driving 6–8 white LEDs for high-brightness LCD backlight in compact smartphones with battery-powered operation. IC Role / Device Role / Timing Role: Primary WLED driver with adaptive charge pump, ALS-based ambient compensation, and I²C-configurable dimming curve. Use Value: Delivers uniform brightness (±0.8% current matching) and >90% efficiency while reducing bill-of-materials by integrating LDOs for camera sensor biasing. | Use Scenario: Controlling 4 low-current LEDs for alphanumeric keypad backlight in portable audio devices with variable ambient lighting. IC Role / Device Role / Timing Role: Secondary LED driver group (Group B) providing 8-step linear dimming synchronized with ALS zone transitions. Use Value: Enables automatic keypad brightness scaling (e.g., 10% in dark, 100% in sunlight) using on-chip ALS engine-no additional MCU polling required. |
| Digital Camera Module Power | Portable Gaming Device UI Lighting |
Use Scenario: Supplying regulated 2.8 V/300 mA to CMOS image sensor and 1.8 V/150 mA to ISP in ultra-thin camera modules. IC Role / Device Role / Timing Role: Integrated LDO1/LDO2 regulator delivering low-noise, high-PSRR (65 dB) power with fast 70 µs turn-on time per LDO. Use Value: Eliminates need for discrete LDOs and reduces PCB area by 40% versus discrete solution while maintaining <30 mV startup overshoot. | Use Scenario: Dynamic backlight control for OLED UI elements in handheld gaming consoles under rapidly changing ambient conditions. IC Role / Device Role / Timing Role: ALS-driven Group A dimming combined with external PWM input for real-time scene-based brightness adjustment. Use Value: Synchronizes LED intensity with game content (via PWM) and environment (via ALS), extending battery life by 18% versus fixed-backlight designs. |
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 |
|---|---|---|---|
| LM3538TMX/NOPB | Same pinout and feature set but adds hardware shutdown (nSHDN) pin and enhanced thermal shutdown threshold (145°C vs. 160°C). | Preferred for thermally constrained designs requiring faster fault response; lacks direct ALS interrupt capability on D7/INT. | Select LM3538TMX/NOPB when board-level thermal management demands tighter junction temperature control and nSHDN signal routing is feasible. |
| TPS61165RSAR | Single-group 6-channel WLED driver (no Group B), no integrated LDOs or ALS; uses external resistive feedback for dimming. | Requires external LDOs and ambient sensor circuitry; supports higher LED VF (up to 26 V) but lacks autonomous ALS adaptation. | Choose TPS61165RSAR only when higher output voltage (>4.2 V) is needed and system-level ALS implementation is already present. |
Compared with LM3537TMX/NOPB, LM3538TMX/NOPB offers improved thermal safety at the cost of ALS interrupt flexibility, while TPS61165RSAR trades integration for higher voltage capability-neither provides the same combination of dual-group dimming, on-chip ALS, and four LDOs in a 30-bump DSBGA.
Availability
LM3537TMX/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, portable media player UI illumination, digital camera module power delivery, and handheld gaming device ambient-adaptive lighting requiring stable component supply and long-term production continuity.
Supply support for LM3537TMX/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 lighting ICs.
The LM3537TMX/NOPB belongs to TI's integrated WLED driver product line, engineered specifically for space-constrained mobile devices requiring high-efficiency backlight control, ambient light adaptation, and multi-rail power integration in a single chip.
FAQ
What is the maximum total output current supported by the LM3537TMX/NOPB?
The LM3537TMX/NOPB supports a maximum total output current of 180 mA, distributed across its eight LED current sinks. Group A (D1–D8) delivers up to 25 mA per channel (200 mA theoretical), but the device limits total current to 180 mA to ensure thermal stability and regulation integrity across the full input voltage range (2.7–5.5 V). This limit is enforced by internal current limiting and thermal shutdown circuitry.
How does the LM3537TMX/NOPB implement ambient light sensing without an external ADC?
The LM3537TMX/NOPB integrates a dedicated ALS analog front-end with a 1-V reference, programmable internal resistor ladder (RALS options from 0.65 kΩ to 20.2 kΩ), and 8-level configurable averaging. It digitizes ambient light via internal successive-approximation ADC and compares results against four user-defined zone boundary registers (ZB0–ZB3) to trigger automatic LED brightness transitions-no external ADC or MCU polling is required.
Can the LDO outputs of the LM3537TMX/NOPB be powered from different input sources?
No-the LM3537TMX/NOPB LDOs share a common input rail (VIN_C), which must be supplied from either the main battery (same as VIN_A) or a post-regulated buck converter output. VIN_C must remain within 1.8 V to VIN_A and exceed the selected LDO output voltage by at least 0.5 V. Independent input rails per LDO are not supported.
What is the purpose of the D7/INT pin on the LM3537TMX/NOPB?
The D7/INT pin on the LM3537TMX/NOPB serves a dual function: as LED driver output D7 in Group A, or as an active-low interrupt output signaling ambient light zone boundary crossings. When configured as INT (via register bit), it pulls low upon ALS zone transition and requires an external pullup resistor. This enables the host MCU to respond asynchronously to ambient changes without continuous register polling.
Does the LM3537TMX/NOPB support both linear and exponential dimming curves?
Yes-the LM3537TMX/NOPB supports selectable dimming curves per group. Group A (D1–D8) offers user-configurable exponential or linear 128-step dimming via register setup; Group B (D1–D4) provides fixed 8-step linear dimming only. Exponential dimming improves perceived brightness resolution at low intensities, critical for smartphone display usability in low-light environments.
LM3537TMX/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
LM3537TMX/NOPB FAQ
1.How can I place an order for LM3537TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3537TMX/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 LM3537TMX/NOPB reliable?
The price and inventory of LM3537TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3537TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3537TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3537TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3537TMX/NOPB?
LM3537TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3537TMX/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 LM3537TMX/NOPB?
For technical support, including LM3537TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3537TMX/NOPB requirements.
6.How does Aetrix verify that LM3537TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3537TMX/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 LM3537TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3537TMX/NOPB?
All LM3537TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3537TMX/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 LM3537TMX/NOPB part is unused and in its original packaging.
Return procedure for LM3537TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3537TMX/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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