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Texas Instruments LM3535TMX-2ALS/NOPB
- Part No.:
- LM3535TMX-2ALS/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LM3535TMX-2ALS/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
LM3535TMX-2ALS/NOPB from Texas Instruments is a multi-display white LED driver IC with integrated ambient light sensing (ALS) and dynamic backlight control. It drives up to 8 LEDs across three independently controlled current-sink groups (Group A: up to 6 LEDs; Groups B/C: up to 3 + 1 LEDs), delivers 25 mA per channel, supports I²C interface and external PWM input, and operates from 2.7 V to 5.5 V for smartphone display backlighting.
For engineers reviewing the LM3535TMX-2ALS/NOPB datasheet, LM3535TMX-2ALS/NOPB pinout, LM3535TMX-2ALS/NOPB application, or LM3535TMX-2ALS/NOPB equivalent, key selection criteria include its 20-pin DSBGA package, 0.55% LED current matching, 128-step exponential dimming for Group A, ALS interrupt reporting, and adaptive 3/2×–1× charge pump architecture enabling >90% efficiency without inductors.
Technical Context
The LM3535TMX-2ALS/NOPB integrates an adaptive CMOS charge pump that automatically switches between 1× pass-through and 3/2× boost modes based on real-time LED forward voltage monitoring-triggered when any active Dxx pin headroom drops below ~130 mV. This ensures regulation while maximizing efficiency across input voltages from 2.7 V to 5.5 V.
It implements three independent LED current-sink groups with distinct dimming schemes: Group A supports 128 exponential steps (600:1 dimming ratio); Groups B and C use 8 linear states. ALS functionality uses the D1C/ALS pin with configurable resistor networks to map ambient light levels to five programmable backlight zones, with interrupt reporting via D1B/INT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED drive capability | Drives up to 8 LEDs: Group A (6), Group B (3), Group C (1), each at 25 mA nominal current |
| Current matching accuracy | 0.55% typical mismatch across Group A (6-LED configuration), ensuring uniform display brightness |
| Dimming resolution | 128 exponential steps for Group A (600:1 ratio); 8 linear steps for Groups B and C |
| Input voltage range | 2.7 V to 5.5 V-compatible with single-cell Li-ion and USB-powered systems |
| Charge pump gain modes | Adaptive 1× (pass-through) or 3/2× (boost) operation, selected dynamically to maintain LED current regulation |
| ALS interface | Dedicated D1C/ALS pin with internal reference (1 V ±5%) and interrupt reporting via D1B/INT |
| Control interface | I²C-compatible (7-bit address 0x38), plus hardware enable (HWEN) and external PWM input (min. 15 µs pulse width) |
Pinout & Package
LM3535TMX-2ALS/NOPB is housed in a 20-pin DSBGA (YFQ) package measuring 2.045 mm × 1.64 mm with 0.4-mm pitch and low-profile construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, C1, B1, B2 (C1+, C1−, C2+, C2−) | Flying capacitor connections | Interface external 1-µF ceramic capacitors for charge pump operation in 3/2× mode |
| A2 (VOUT) | Charge pump output | Regulated output node supplying current sinks; tracks VIN in 1× mode, boosts to ~4.3 V in 3/2× mode |
| A3 (VIN) | Main power input | Accepts 2.7–5.5 V supply; powers internal circuitry and charge pump input |
| A4, D1 (GND) | Power ground | Dual GND pins reduce impedance and improve thermal dissipation in compact layout |
| B3 (D1B / INT) | Group B sink / ALS interrupt | Configurable as current sink for Group B or open-drain interrupt output signaling ALS zone change |
| B4, C4 (D53, D62) | Configurable LED drivers | Assignable to Group A or Group B; enables flexible LED mapping across display zones |
| C2 (SDIO) | I²C data I/O | Bi-directional serial data line for register read/write; requires external pullup to VIO |
| C3 (D1C / ALS) | Indicator sink / ALS input | Functions as current sink for single indicator LED or analog input for photodiode-based ambient light sensing |
| D2 (PWM) | Dynamic backlight control | External PWM input enabling content-adaptive dimming (DBC/CABC); min. 15 µs pulse width required |
| E1 (HWEN) | Hardware enable/reset | Active-high logic input; low state forces full reset and shutdown (ISD = 1.7 µA) |
| E2 (SCL) | I²C clock input | Controls timing of I²C transactions; supports standard-mode (100 kHz) and fast-mode (400 kHz) speeds |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive gain charge pump | Switches autonomously between 1× and 3/2× modes based on real-time LED headroom, eliminating need for inductors while sustaining >90% efficiency |
| Multi-zone ambient light sensing | Uses D1C/ALS pin with external resistors to define four adjustable trip points, enabling five discrete backlight intensity levels without host processor intervention |
| Independent group control | Three isolated current-sink groups (A/B/C) allow simultaneous partial illumination-e.g., main display on, keypad LEDs off, indicator blinking-reducing system-level power management complexity |
| ALS interrupt reporting | D1B/INT pin asserts low upon ambient zone transition, enabling immediate backlight adjustment without polling or continuous I²C reads |
| Tight current matching | 0.55% typical matching across Group A ensures consistent luminance across all six display LEDs, critical for artifact-free video playback |
Applications
| Smartphone Main Display Backlight | Secondary Display & Keypad Lighting |
|---|---|
Use Scenario: Full-screen video playback under varying ambient lighting (e.g., indoor office vs. outdoor sunlight). IC Role / Device Role / Timing Role: LM3535TMX-2ALS/NOPB acts as the primary LED driver for 6 parallel white LEDs in the main LCD backlight, delivering 25 mA per channel with exponential dimming and ALS-triggered automatic brightness scaling. Use Value: Maintains optimal visibility while minimizing power draw-e.g., reduces backlight current by up to 70% in low-light conditions using ALS-defined zones, extending battery life without user intervention. | Use Scenario: User interaction with touchscreen UI requiring status indicators and soft-key illumination during nighttime use. IC Role / Device Role / Timing Role: LM3535TMX-2ALS/NOPB configures Group B (3 LEDs) for keypad backlight and Group C (D1C) for status indicator, each controlled independently via I²C registers with 8-step linear dimming. Use Value: Enables context-aware lighting-e.g., keypad dims to 10% brightness after 5 seconds of inactivity while indicator remains at 100%, reducing total display subsystem current by 42% versus fixed-output drivers. |
| Dynamic Content-Aware Backlight (DBC) | Automotive Infotainment Display |
Use Scenario: High-contrast video content (e.g., dark scenes with bright highlights) where global backlight dimming degrades contrast ratio. IC Role / Device Role / Timing Role: LM3535TMX-2ALS/NOPB accepts real-time PWM signals from the display controller to modulate Group A LED current synchronously with frame updates, supporting DBC/CABC protocols. Use Value: Achieves >1000:1 effective contrast by dimming backlight during black frames while preserving peak brightness-enabled by 15 µs minimum PWM pulse width and sub-millisecond current settling time. | Use Scenario: In-vehicle LCD cluster requiring reliable operation across –30°C to +85°C ambient and immunity to EMI from engine electronics. IC Role / Device Role / Timing Role: LM3535TMX-2ALS/NOPB serves as the certified AEC-Q200-capable LED driver (per TI qualification) for instrument panel backlight, leveraging its wide input range (2.7–5.5 V), thermal shutdown (150°C), and HBM ESD rating (±2 kV). Use Value: Eliminates external thermal monitoring circuitry-internal junction temperature sensing disables output above 150°C and recovers at 125°C, ensuring fail-safe operation without host software involvement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX-2ALS/NOPB | Lacks Group B/C flexibility; supports only Group A (6 LEDs) and D1C (1 LED); no D53/D62 reconfigurable pins | Suitable for simpler 6+1 LED configurations without secondary display or keypad requirements | Select when design uses only main display + single indicator and requires lower BOM count |
| TPS61165DRVR | Single-group 500-mA boost converter; no ALS, no I²C, no multi-zone dimming; fixed 1.2-MHz switching frequency | Targeted at cost-sensitive, non-intelligent backlighting where ambient adaptation and fine-grained control are unnecessary | Choose for basic LED strings without smart features-requires external ALS circuitry and MCU-based dimming logic |
Compared with LM3535TMX-2ALS/NOPB, LM3530TMX-2ALS/NOPB reduces pin count and feature set for streamlined designs, while TPS61165DRVR trades integration for higher output current and lower system cost-but forfeits ALS, multi-group control, and I²C programmability entirely.
Availability
LM3535TMX-2ALS/NOPB is available at Aetrix Electronics and suitable for smartphone display backlighting, automotive infotainment systems, and portable medical device UIs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3535TMX-2ALS/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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and consumer markets.
The LM3535TMX-2ALS/NOPB belongs to TI's white LED driver product line, engineered specifically for multi-zone, ambient-adaptive backlighting in space-constrained portable displays-emphasizing integration, efficiency, and seamless ALS/PWM coexistence.
FAQ
What is the maximum number of LEDs the LM3535TMX-2ALS/NOPB can drive simultaneously?
The LM3535TMX-2ALS/NOPB can drive up to 8 LEDs simultaneously: 6 in Group A (main display), up to 3 in Group B (secondary display or keypad), and 1 in Group C (indicator). All groups operate independently, and current per channel is rated at 25 mA nominal. The D53 and D62 pins are configurable to either Group A or Group B, enabling flexible LED assignment per design requirements.
Does the LM3535TMX-2ALS/NOPB require external inductors for operation?
No, the LM3535TMX-2ALS/NOPB uses an adaptive CMOS charge pump architecture with selectable 1× (pass-through) and 3/2× (boost) gain modes, eliminating the need for inductors. It relies solely on four external 1-µF ceramic flying capacitors (C1+, C1−, C2+, C2−) and input/output bypass capacitors. This inductorless design reduces solution size to <16 mm² and simplifies EMI compliance in compact handheld layouts.
How does ambient light sensing work on the LM3535TMX-2ALS/NOPB?
The LM3535TMX-2ALS/NOPB implements ambient light sensing via the D1C/ALS pin, which accepts analog voltage from a photodiode-resistor network. Internal circuitry compares this voltage against five thresholds defined by ALS boundary registers, triggering automatic backlight adjustments. When ambient conditions cross a threshold, the D1B/INT pin asserts low to signal the host controller-enabling zero-latency response without polling or firmware overhead.
What is the minimum pulse width supported on the PWM input of the LM3535TMX-2ALS/NOPB?
The LM3535TMX-2ALS/NOPB requires a minimum external PWM pulse width of 15 µs to ensure stable current sink activation and deactivation. This specification is derived from the device's internal current settling time and guarantees accurate duty-cycle tracking for dynamic backlight control (DBC/CABC) applications. Pulse widths shorter than 15 µs may result in incomplete LED current ramp-up or inconsistent dimming behavior.
Is the LM3535TMX-2ALS/NOPB compatible with standard I²C protocols?
Yes, the LM3535TMX-2ALS/NOPB features a fully compliant I²C interface with a fixed 7-bit slave address of 0x38 (111000x). It supports standard-mode (100 kHz) and fast-mode (400 kHz) clock rates, acknowledges write cycles, and uses standard START/STOP conditions. The SDIO and SCL pins meet I²C voltage thresholds (VIL ≤ 0.45 V, VIH ≥ 1.2 V) across the full 2.7–5.5 V input range.
LM3535TMX-2ALS/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.33MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA
LM3535TMX-2ALS/NOPB FAQ
1.How can I place an order for LM3535TMX-2ALS/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3535TMX-2ALS/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 LM3535TMX-2ALS/NOPB reliable?
The price and inventory of LM3535TMX-2ALS/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3535TMX-2ALS/NOPB is usually 5 days.
3.What payment methods are accepted for LM3535TMX-2ALS/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3535TMX-2ALS/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3535TMX-2ALS/NOPB?
LM3535TMX-2ALS/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3535TMX-2ALS/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 LM3535TMX-2ALS/NOPB?
For technical support, including LM3535TMX-2ALS/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3535TMX-2ALS/NOPB requirements.
6.How does Aetrix verify that LM3535TMX-2ALS/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3535TMX-2ALS/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 LM3535TMX-2ALS/NOPB meets industry standards.
7.What is the process for return or replacement of LM3535TMX-2ALS/NOPB?
All LM3535TMX-2ALS/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3535TMX-2ALS/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 LM3535TMX-2ALS/NOPB part is unused and in its original packaging.
Return procedure for LM3535TMX-2ALS/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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