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Texas Instruments LM3537TME/NOPB
- Part No.:
- LM3537TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 30-WFBGA, DSBGA
- Datasheet:
-
LM3537TME/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 30DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LM3537TME/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 auto-gain control via GPO1/GPO2, and supports I²C configuration and external PWM dimming.
For engineers reviewing the LM3537TME/NOPB datasheet, LM3537TME/NOPB pinout, LM3537TME/NOPB application, or LM3537TME/NOPB equivalent, this device is selected for adaptive multi-zone backlight systems requiring tightly matched LED current sinks (±3% matching), programmable LDOs (1.2–3.3 V, 150/300 mA), and autonomous ALS-driven brightness adjustment without MCU intervention.
Technical Context
The LM3537TME/NOPB implements an adaptive 1×/1.5× charge pump with automatic gain selection based on LED forward voltage and input supply, achieving up to 90% efficiency without inductors. Its dual-group current sink architecture separates eight channels into Group A (8 LEDs) and Group B (4 LEDs), each with independent dimming control and headroom monitoring (100 mV typical).
Integrated ambient light sensing uses a configurable ALS input (0–1 V range) with five-zone mapping, programmable boundary registers, and hardware interrupt (D7/INT), while four LDOs-LDO1 (300 mA), LDO2–LDO4 (150 mA each)-support post-regulation from battery or buck converter rails with ±2% output accuracy and 100–220 mV dropout.
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 Current Accuracy | ±7.5% - ensures consistent luminance across all 8 channels under varying temperature and supply conditions. |
| Current Matching (Group A/B) | ≤3% - minimizes visible brightness variation between LEDs in same group, critical for uniform display backlighting. |
| LDO Output Range | 1.2 V to 3.3 V - programmable via I²C to match camera module, sensor, or interface IC voltage requirements. |
| ALS Input Range | 0 V to 1 V - compatible with standard photodiode-based ambient light sensors (e.g., ROHM BH1621FVC) without signal conditioning. |
| Charge Pump Efficiency | Up to 90% - eliminates need for magnetic components while maintaining high power conversion in space-constrained designs. |
| I²C Interface Speed | Standard-mode (100 kHz) and fast-mode (400 kHz) - enables rapid register writes for dynamic brightness updates during video playback. |
Pinout & Package
LM3537TME/NOPB is packaged in a 30-bump DSBGA (2.1 mm × 1.7 mm, 0.4 mm pitch), optimized for ultra-thin mobile applications. The package features separate PGND and GND pins for noise isolation between LED driver and regulator sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A | Main input for LED driver and ALS interface | Supplies charge pump and sensor bias; must be 2.7–5.5 V; shared with VIN_B and VIN_C in most implementations. |
| D1–D8 | Constant-current LED sink outputs | Eight independent current sinks; D1–D8 connect to LED cathodes in common-anode configuration; max 25 mA per channel. |
| LDO1–LDO4 | Programmable LDO outputs | LDO1 = 300 mA, LDO2–LDO4 = 150 mA each; output voltages set via I²C; used for camera modules, sensors, or logic rails. |
| SCL / SDA | I²C serial interface | Standard 2-wire bus for full configuration of dimming curves, ALS zones, LDO settings, and interrupt behavior. |
| ALS / D7/INT | Ambient light sensor input / interrupt output | ALS pin accepts analog voltage from photodiode; D7/INT asserts low when zone transition occurs - requires external pullup. |
| PWM / HWEN | External dimming control / hardware enable | PWM pin allows content-adaptive backlight control (CABC); HWEN high enables full operation, low forces reset and shutdown. |
| GPO1 / GPO2 | General-purpose outputs | Configurable as open-drain or push-pull; used for sensor gain switching (e.g., ROHM BH1600-series) or system signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1×/1.5× charge pump | Automatically selects gain mode to maximize efficiency across input voltage (2.7–5.5 V) and LED VF (2.0–4.0 V) variations. |
| Two independent dimming groups | Group A (8 channels, 128-step dimming) for main display; Group B (4 channels, 8-step dimming) for keypad/sub-display - no shared registers. |
| Integrated ALS engine with 5-zone mapping | Configurable ambient thresholds (ZB0–ZB3) and target brightness (Zone 0–4) enable fully autonomous backlight adaptation without host CPU polling. |
| Four programmable LDOs with shared enable control | LDO1 (300 mA) + LDO2–LDO4 (150 mA each) support mixed-voltage subsystems; all outputs adjustable from 1.2 V to 3.3 V in 50-mV steps. |
| Hardware-assisted auto-gain for ambient sensors | GPO1/GPO2 toggle sensor gain (e.g., high/low) automatically based on ambient intensity - reduces firmware overhead and improves dynamic range. |
Applications
| Smartphone Main Display Backlight | MP3 Player Keypad Illumination |
|---|---|
|
Use Scenario: Full-screen LCD backlighting with content-aware dimming and ambient-adaptive brightness. IC Role / Device Role / Timing Role: Primary WLED driver controlling 8 parallel strings; provides I²C-configurable exponential dimming and ALS-triggered zone transitions. Use Value: Enables >1000:1 contrast ratio via 128-step Group A dimming while maintaining ±3% current matching for pixel-level uniformity. |
Use Scenario: Low-power keypad backlight activated only in low-light conditions. IC Role / Device Role / Timing Role: Secondary LED driver (Group B) with 8-step linear dimming; ALS input triggers illumination only below user-defined lux threshold. Use Value: Reduces standby current by disabling Group B until ALS detects <50 lux, extending battery life in portable audio devices. |
| Digital Camera Module Power | Adaptive Gaming Device UI Lighting |
|
Use Scenario: Point-of-load regulation for CMOS image sensor and ISP core voltage. IC Role / Device Role / Timing Role: LDO1 supplies 2.8 V @ 300 mA to camera sensor; LDO2 supplies 1.8 V @ 150 mA to ISP; both enabled synchronously via I²C. Use Value: Eliminates need for discrete regulators; ±2% LDO accuracy ensures stable sensor operation across temperature and load transients. |
Use Scenario: Dynamic UI backlighting synchronized to game scene brightness and ambient environment. IC Role / Device Role / Timing Role: Combines external PWM input (for scene-based dimming) and ALS input (for ambient compensation) to drive RGB indicator LEDs. Use Value: Achieves real-time backlight response (<250 µs startup) and seamless transitions between CABC and ALS modes without visual flicker. |
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 |
|---|---|---|---|
| LM3538TME/NOPB | Same pinout and feature set, but adds internal 10-bit ADC for direct ALS digitization - eliminates external ADC requirement. | Preferred where higher ALS resolution (10-bit vs analog comparator) and reduced BOM count are critical. | Select LM3538TME/NOPB if ALS measurement precision >1% is required; otherwise LM3537TME/NOPB offers lower cost and identical core functionality. |
| TPS61165RTVR | Single-output boost converter WLED driver (no LDOs, no ALS, no I²C); 30-V output, 30-mA max; fixed 1.2-MHz switching. | Only suitable for basic constant-current LED driving without ambient adaptation or auxiliary power regulation. | Choose TPS61165RTVR only for cost-sensitive, non-adaptive backlight designs requiring >30-V LED string voltage - not a functional replacement for LM3537TME/NOPB. |
Compared with LM3538TME/NOPB, LM3537TME/NOPB lacks integrated ADC but retains identical LDO capability, ALS interrupt logic, and dual-group dimming - making it optimal for systems using external ALS ADC or analog comparator circuits. Versus TPS61165RTVR, LM3537TME/NOPB provides comprehensive system integration (LDOs, ALS, I²C, dual-group control) at the expense of higher BOM complexity.
Availability
LM3537TME/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, portable media player UI illumination, and digital camera module power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3537TME/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 over 50 years of innovation in high-efficiency power conversion and precision analog solutions.
The LM3537TME/NOPB belongs to TI's WLED driver product line, engineered specifically for space-constrained mobile displays requiring adaptive backlighting, integrated point-of-load regulation, and autonomous ambient light response - targeting smartphone, tablet, and portable multimedia applications.
FAQ
What is the maximum total output current supported by the LM3537TME/NOPB?
The LM3537TME/NOPB supports a maximum total output current of 180 mA across all eight LED channels. This is achieved with Group A (8 channels) delivering up to 25 mA each and Group B (4 channels) delivering up to 25 mA each, though simultaneous full-scale operation of all 12 channels is limited by thermal and efficiency constraints - the datasheet specifies 180 mA as the safe operational ceiling for continuous use. LM3537TME/NOPB thermal design must account for junction temperature limits (−30°C to +110°C) under these conditions.
How does the LM3537TME/NOPB handle ambient light sensor gain switching?
The LM3537TME/NOPB uses GPO1 and GPO2 to implement hardware-controlled auto-gain for ambient light sensors such as the ROHM BH1600-series. When autogain_en is enabled, GPO1 and GPO2 output complementary logic states (0/1 for low gain, 1/0 for high gain) based on detected ambient intensity - eliminating software polling. This function is configured via Register 52H and operates independently of I²C host intervention. LM3537TME/NOPB's ALS engine determines gain transitions using programmable trip points (ALS LOW_to_HIGH_TP, Z3_to_Z2) to ensure hysteresis and prevent oscillation.
Can the LM3537TME/NOPB drive LEDs with forward voltages above 4.0 V?
No - the LM3537TME/NOPB is specified for LED forward voltages from 2.0 V to 4.0 V. Its charge pump output (VOUT) is regulated to ~4.2 V in closed-loop mode, and the current sink headroom requirement (100 mV typical) means usable compliance is ~4.1 V. Driving LEDs with VF > 4.0 V risks insufficient headroom, leading to loss of current regulation and brightness instability. LM3537TME/NOPB must be used with LEDs meeting the 2.0–4.0 V VF specification at rated current.
What are the default output voltages of the four LDOs in the LM3537TME/NOPB?
At power-on reset, LM3537TME/NOPB configures LDO1 to 2.80 V (300 mA), LDO2 and LDO3 to 1.80 V (150 mA each), and LDO4 to 2.80 V (150 mA). These defaults are factory-programmed and stored in nonvolatile configuration registers. All four LDOs remain disabled until explicitly enabled via I²C command - no LDO activates automatically at startup. LM3537TME/NOPB allows reprogramming any LDO output voltage from 1.2 V to 3.3 V in 50-mV increments through the serial interface.
Is the LM3537TME/NOPB pin-compatible with the LM3538TME/NOPB?
Yes - LM3537TME/NOPB and LM3538TME/NOPB share identical 30-bump DSBGA packaging, pin assignment, and mechanical footprint. They are hardware drop-in replacements for PCB layout purposes. However, LM3538TME/NOPB adds an internal 10-bit ADC and modifies ALS register mapping; firmware must be updated to leverage new features or maintain compatibility. LM3537TME/NOPB remains fully functional in LM3538TME/NOPB layouts, but cannot access ADC-related registers.
LM3537TME/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
LM3537TME/NOPB FAQ
1.How can I place an order for LM3537TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3537TME/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 LM3537TME/NOPB reliable?
The price and inventory of LM3537TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3537TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM3537TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3537TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3537TME/NOPB?
LM3537TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3537TME/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 LM3537TME/NOPB?
For technical support, including LM3537TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3537TME/NOPB requirements.
6.How does Aetrix verify that LM3537TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3537TME/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 LM3537TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM3537TME/NOPB?
All LM3537TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3537TME/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 LM3537TME/NOPB part is unused and in its original packaging.
Return procedure for LM3537TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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