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Texas Instruments LM3535TMX/NOPB
- Part No.:
- LM3535TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LM3535TMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,329
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Product details
Overview
LM3535TMX/NOPB from Texas Instruments is a multi-display white LED driver IC with integrated ambient light sensing and dynamic backlight control. It drives up to 8 LEDs across three independently controlled groups (Group A: 6 LEDs, Group B: 3 LEDs, Group C: 1 LED), each with programmable current regulation (25 mA nominal), 128-step exponential dimming for Group A, and I²C-compatible digital interface. It operates from 2.7 V to 5.5 V input and delivers up to 90% efficiency using an adaptive 3/2× or 1× regulated charge pump - deployed in smartphone main/sub-display backlighting.
For engineers reviewing the LM3535TMX/NOPB datasheet, LM3535TMX/NOPB pinout, LM3535TMX/NOPB application, or LM3535TMX/NOPB equivalent, key selection considerations include its 20-pin DSBGA package (2.045 mm × 1.64 mm), ALS interrupt reporting capability, PWM-controlled dynamic backlight modulation (min. 15 µs pulse width), and precise current matching (0.55% typical) across LED groups.
Technical Context
The LM3535TMX/NOPB implements 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 stable current regulation while maximizing efficiency across varying VIN (2.7–5.5 V) and VLED (2–4 V) conditions.
Its I²C interface (7-bit address 0x38) configures group-level enable/disable, brightness codes, ALS thresholds, and PWM polarity/acknowledge mode. Three independent current sink groups support simultaneous operation: Group A (D1A–D4A, D53, D62) with 128 exponential steps; Group B (D1B, D53, D62) and Group C (D1C) with 8 linear steps each - all supporting individual on/off control and hardware reset via HWEN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and USB-powered systems without external LDO. |
| Max Total Output Current | 200 mA - enables full-scale drive of 8×25 mA LEDs across Groups A/B/C simultaneously. |
| LED Current Accuracy | ±5.2% (Group A, 6-LED config) - ensures consistent luminance across display zones under varying thermal/load conditions. |
| Current Matching | 0.55% typical - minimizes visible brightness variation between LEDs in same group (e.g., main display edge uniformity). |
| Charge Pump Efficiency | Up to 90% - reduces thermal load and extends battery life in portable devices. |
| ALS Input Support | Configurable 4-zone ambient light sensing with interrupt reporting - enables autonomous backlight adaptation without host CPU polling. |
| PWM Minimum Pulse Width | 15 µs - compatible with high-frequency dynamic backlight control (DBC/CABC) in modern display drivers. |
Pinout & Package
LM3535TMX/NOPB uses a 20-pin DSBGA (YFQ) package measuring 2.045 mm × 1.64 mm with 0.4 mm pitch and low-profile construction suitable for space-constrained mobile PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, C1, B1, B2 (C1+, C1−, C2+, C2−) |
Flying capacitor connections | Interface external 1 µF ceramic capacitors to enable charge pump operation in 1× or 3/2× gain modes. |
| A2 (VOUT) | Charge pump output | Regulated output node supplying bias to all LED current sinks; voltage dynamically adjusted per gain mode. |
| A3 (VIN) | Main power input | Accepts 2.7–5.5 V supply; powers internal circuitry and feeds charge pump input. |
| A4, D1 (GND) | Power ground | Dual GND pins reduce impedance and improve current-sink stability and EMI performance. |
| B3 (D1B / INT) | Group B LED sink / ALS interrupt | Configurable dual-function pin: drives indicator LED or reports ALS threshold crossing as open-drain interrupt. |
| B4, C4 (D53, D62) | Configurable LED current sinks | Assignable to Group A or Group B - enables flexible allocation of 8 total LED channels. |
| C2 (SDIO) | I²C data I/O | Bi-directional serial interface pin compliant with I²C timing specs (t2 ≥ 100 ns setup, VOL ≤ 400 mV @ 3 mA). |
| C3 (D1C / ALS) | Indicator LED sink / ALS sensor input | Drives single indicator LED or accepts photodiode voltage for ambient light measurement with internal reference (1 V ±5%). |
| D2 (PWM) | Dynamic backlight control input | Directly modulates LED current sinks; requires ≥15 µs minimum pulse width for full settling. |
| E1 (HWEN) | Hardware enable/reset | Active-high logic input; forces full register reset and shutdown when pulled low - bypasses I²C for fast system-level control. |
| E2 (SCL) | I²C clock input | Accepts standard I²C clock (t1 ≥ 2.5 µs period); synchronizes all register reads/writes and brightness updates. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 3/2×–1× charge pump | Automatically selects optimal gain mode based on real-time LED headroom to sustain 25 mA regulation while maximizing efficiency across input and LED voltage ranges. |
| Multi-zone ambient light sensing | Supports four user-defined light-level trip points with interrupt reporting - enabling closed-loop, CPU-free backlight adaptation in varying lighting environments. |
| Independent group dimming | Group A: 128 exponential steps (600:1 ratio); Groups B & C: 8 linear steps - allows perceptually uniform main display dimming while preserving discrete keypad/indicator control. |
| Hardware enable with reset function | HWEN pin provides immediate device disable and register reset without I²C transaction - critical for system power sequencing and fault recovery. |
| Total solution size < 16 mm² | Integrates charge pump, 8 current sinks, ALS interface, and I²C logic into 2.045 mm × 1.64 mm DSBGA - eliminates discrete boost inductors and external sense resistors. |
Applications
| Smartphone Main Display Backlight | Secondary Display & Keypad Lighting |
|---|---|
|
Use Scenario: Driving 6 parallel white LEDs behind a 4–6 inch LCD panel with automatic brightness adjustment based on ambient light and video content. IC Role / Device Role / Timing Role: Primary LED driver IC providing regulated 25 mA per channel, exponential dimming, and ALS-triggered intensity scaling. Use Value: Enables seamless transition between indoor/outdoor viewing with <15 µs PWM response and 0.55% current matching for edge-to-edge luminance uniformity. |
Use Scenario: Powering 3 auxiliary LEDs for sub-display, status indicators, or keypad illumination with independent brightness control. IC Role / Device Role / Timing Role: Secondary current sink group (Group B) delivering 25 mA with 8-step linear dimming and hardware-selectable on/off states. Use Value: Reduces BOM count by integrating dedicated indicator drive into main backlight IC - no separate driver required for non-critical lighting zones. |
| Dynamic Backlight Control (DBC) | Ambient Light Adaptive Backlighting |
|
Use Scenario: Synchronizing LED intensity with display frame content (e.g., dark scenes dimmed, bright scenes boosted) via external PWM signal from display controller. IC Role / Device Role / Timing Role: PWM-gated current sink modulator accepting 250 Hz–20 kHz signals with 15 µs minimum pulse width for accurate duty-cycle tracking. Use Value: Achieves >30% power savings in video playback without perceptible flicker or brightness lag due to fast current-sink settling. |
Use Scenario: Adjusting backlight level autonomously across office, outdoor, and nighttime environments using photodiode input and programmable ALS thresholds. IC Role / Device Role / Timing Role: Integrated ALS front-end with 1 V reference, configurable resistor network, and interrupt-driven zone reporting. Use Value: Eliminates need for external ADC or microcontroller polling - ALS events trigger immediate register updates or host interrupts via D1B/INT pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-display LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | Lacks Group B/C flexibility; supports only 6-channel Group A with identical 128-step dimming and ALS, but no D53/D62 reassignment or D1C/ALS dual-mode pin. | Suitable for main-display-only designs without secondary lighting requirements. | Select LM3530TMX/NOPB when only Group A functionality is needed and board space allows slightly larger 16-pin QFN package. |
| TPS61165DRVR | Single-group 5-channel boost LED driver with 1.2 MHz fixed-frequency converter; no ALS, no I²C, no multi-zone dimming - only analog/PWM brightness control. | Targeted at cost-sensitive, fixed-brightness applications like basic LCD modules or industrial HMIs. | Choose TPS61165DRVR where ALS, I²C programmability, and independent group control are unnecessary and higher peak efficiency (>90%) is prioritized. |
Compared with LM3535TMX/NOPB, LM3530TMX/NOPB offers identical core backlight features but reduced channel flexibility and packaging, while TPS61165DRVR trades digital intelligence for analog simplicity and higher switching efficiency - making LM3535TMX/NOPB the only option supporting concurrent main/sub-display + ALS + DBC in one die.
Availability
LM3535TMX/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, portable display modules, and embedded human-machine interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3535TMX/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 - serving automotive, industrial, personal electronics, and communications markets.
The LM3535TMX/NOPB belongs to TI's white LED driver product line, engineered specifically for space-constrained portable displays requiring integrated ambient sensing, multi-zone dimming, and high-efficiency charge-pump architecture.
FAQ
What is the maximum number of LEDs the LM3535TMX/NOPB can drive simultaneously?
The LM3535TMX/NOPB can drive up to 8 LEDs simultaneously: 6 in Group A (D1A–D4A, D53, D62), up to 3 in Group B (D1B, D53, D62), and 1 in Group C (D1C). Pin assignment allows D53 and D62 to be allocated to either Group A or Group B, enabling flexible configuration per design needs. All groups support independent on/off control and dimming.
Does the LM3535TMX/NOPB require external inductors for operation?
No, the LM3535TMX/NOPB uses a capacitor-based adaptive charge pump (3/2× or 1×) and requires no inductors. It operates with four external 1 µF ceramic flying/output capacitors (C1+, C1−, C2+, C2−, CIN, COUT) - enabling ultra-low profile, EMI-quiet LED driving ideal for thin mobile devices.
How does ambient light sensing work on the LM3535TMX/NOPB?
The LM3535TMX/NOPB implements ambient light sensing via the D1C/ALS pin, which accepts voltage from an external photodiode/resistor network. Internal circuitry compares this voltage against four programmable thresholds, triggering an interrupt on D1B/INT when crossing occurs. ALS zone status is readable via I²C register 0x40, enabling autonomous backlight adjustment without continuous host polling.
What is the purpose of the HWEN pin on the LM3535TMX/NOPB?
The HWEN (Hardware Enable) pin on the LM3535TMX/NOPB provides direct system-level control: pulling it low forces immediate shutdown and full register reset, independent of I²C commands. When high, the device enters standby or active mode based on ENx bit settings. This enables robust power sequencing, fail-safe reset, and low-latency enable/disable in battery-powered systems.
Can the LM3535TMX/NOPB support dynamic backlight control (DBC) using PWM?
Yes, the LM3535TMX/NOPB supports DBC via its dedicated PWM input pin (D2). The internal current sinks respond to externally generated PWM signals with a minimum pulse width of 15 µs, allowing synchronization with display content. PWM polarity and acknowledge behavior are configurable via I²C registers, ensuring compatibility with diverse display controllers implementing CABC or DBC algorithms.
LM3535TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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:
- 1.33MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA
LM3535TMX/NOPB FAQ
1.How can I place an order for LM3535TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3535TMX/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/NOPB reliable?
The price and inventory of LM3535TMX/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/NOPB is usually 5 days.
3.What payment methods are accepted for LM3535TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3535TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3535TMX/NOPB?
LM3535TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3535TMX/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/NOPB?
For technical support, including LM3535TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3535TMX/NOPB requirements.
6.How does Aetrix verify that LM3535TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3535TMX/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/NOPB meets industry standards.
7.What is the process for return or replacement of LM3535TMX/NOPB?
All LM3535TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3535TMX/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/NOPB part is unused and in its original packaging.
Return procedure for LM3535TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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