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Texas Instruments LM3533TMX-40A/NOPB
- Part No.:
- LM3533TMX-40A/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-WFBGA, DSBGA
- Datasheet:
-
LM3533TMX-40A/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 20DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,261
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Product details
Overview
LM3533TMX-40A/NOPB from Texas Instruments is a fully integrated LED power management IC for smartphone illumination systems, driving two parallel high-voltage LED strings (up to 40 V, 20.2 mA each) via an inductive boost converter and five low-voltage indicator LEDs (up to 6 V, 20.2 mA each) via a 2× charge pump. It features I²C programmability, ambient light sensor (ALS) interface with 8-bit ADC, and PWM-based content-adjustable brightness control - deployed in display backlight, keypad, and RGB indicator subsystems.
For engineers reviewing the LM3533TMX-40A/NOPB datasheet, LM3533TMX-40A/NOPB pinout, LM3533TMX-40A/NOPB application, or LM3533TMX-40A/NOPB equivalent, key selection criteria include its dual-output architecture (boost + charge pump), 14-bit equivalent exponential dimming, four programmable pattern generators for blinking sequences, and support for ALS-driven automatic brightness adaptation in mobile handsets.
Technical Context
The LM3533TMX-40A/NOPB integrates a 500-kHz/1-MHz selectable switching boost converter regulating HVLED1/HVLED2 to 400 mV headroom, and a 2× charge pump delivering up to 4.4 V at CPOUT for LVLED1–LVLED5. Its I²C-compatible interface configures control banks (A/B for HV, C–F for LV), enabling grouped LED current assignment and independent dimming profiles.
It implements closed-loop ALS processing with five user-defined brightness zones, internal low-pass filtering, and zone-target current mapping; combined with a dedicated PWM input that modulates any assigned control bank's output current proportionally to duty cycle - all while maintaining ±1% HVLED matching and <2% LVLED matching across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7 V to 5.5 V - supports single-cell Li-ion/Li-poly battery operation without external LDO. |
| HVLED Output Voltage | Up to 40 V - enables driving 8–10 white LEDs in series per string (e.g., SML-312WBCW). |
| HVLED Current Accuracy | ±2% matching between HVLED1/HVLED2 - ensures uniform display backlight luminance. |
| LVLED Current Accuracy | ±2% max matching across LVLED1–LVLED5 - critical for consistent RGB indicator color balance. |
| Dimming Resolution | 14-bit equivalent exponential mapping (8-bit register input) - delivers perceptually linear brightness steps. |
| ALS Interface | 8-bit ADC with 128 programmable gain resistors and internal low-pass filter - enables robust ambient-adaptive dimming without external signal conditioning. |
| Switching Frequency | Selectable 500 kHz or 1 MHz - allows optimization of inductor size (4.7 µH to 22 µH) and efficiency (up to 90%). |
| OVP Thresholds | Four programmable thresholds: 16 V, 24 V, 32 V, 40 V - prevents overvoltage damage during LED open-circuit faults. |
Pinout & Package
LM3533TMX-40A/NOPB is housed in a 20-pin DSBGA package (2.04 mm × 1.78 mm, 0.4 mm pitch), optimized for space-constrained smartphone PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 C− | Charge pump flying capacitor negative | Connects to 1-µF ceramic flying cap; defines charge pump polarity and voltage doubling path. |
| A2 C+ | Charge pump flying capacitor positive | Completes flying cap loop; enables 2× VIN output for LVLED biasing. |
| A3 CPOUT | Charge pump regulated output | Bypassed to GND with 1-µF cap; supplies stable ~4.4 V to LVLED current sinks. |
| A4 IN | Main input supply | Accepts 2.7–5.5 V; requires ≥2.2-µF ceramic bypass for boost converter stability. |
| B1 SCL | I²C clock input | Supports standard/fast-mode I²C (≤400 kHz); controls register access and configuration updates. |
| B2 SDA | I²C bidirectional data | Open-drain I/O; reads status registers (e.g., ALS conversion result, fault flags). |
| B3 OVP | Boost output overvoltage sense | Monitors COUT voltage; triggers shutdown if exceeds programmed threshold (16/24/32/40 V). |
| B4 GND | Power and signal ground | Common reference for all analog/digital circuits; must be low-impedance plane under IC. |
| C1 HVLED1 | High-voltage LED string 1 cathode | Sinks up to 20.2 mA; regulated to 400 mV headroom - sets string current independently of forward voltage. |
| C2 INT | ALS interrupt output | Open-drain; asserts low when ALS crosses zone boundary - enables host processor wake-up on ambient change. |
| C3 PWM | Content-adjustable brightness input | High-impedance; accepts 0–100% duty cycle PWM to scale assigned LED current linearly. |
| C4 SW | Boost switch node | Drives external inductor/diode; peak current limited to 1 A - defines maximum boost power capability. |
| D1 HVLED2 | High-voltage LED string 2 cathode | Functionally identical to HVLED1; matching within ±1% enables dual-string display backlight uniformity. |
| D2 ALS | Ambient light sensor analog input | Accepts 3–15 mV min input; internal 8-bit ADC digitizes ambient intensity for closed-loop brightness control. |
| D3 HWEN | Hardware enable | Pull-high to activate; pull-low forces <5 µA shutdown - enables system-level power gating. |
| D4 LVLED5 | Low-voltage indicator LED 5 sink | Programmable 0–30 mA; supports blinking via pattern generator Bank F. |
| E1 LVLED1 | Low-voltage indicator LED 1 sink | Assigned to Bank C by default; used for primary status indicators (e.g., charging, notification). |
| E2 LVLED2 | Low-voltage indicator LED 2 sink | Configurable to Bank D; enables independent control for multi-color RGB elements. |
| E3 LVLED3 | Low-voltage indicator LED 3 sink | Assignable to Bank E; supports synchronized or staggered blink patterns with LVLED4/LVLED5. |
| E4 LVLED4 | Low-voltage indicator LED 4 sink | Paired with LVLED3 in typical RGB implementations; shares pattern generator resources. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2× charge pump | Eliminates need for external DC/DC converter to bias LVLEDs - reduces BOM count and board area by 27 mm² total solution size. |
| Four programmable pattern generators | Enables independent blink timing (rise/fall/delay/high/low duration) on LVLED groups - supports custom notification sequences without host CPU intervention. |
| ALS with five brightness zones | Allows tiered ambient-adaptive response (e.g., 0–10 lux → 5%, 10–100 lux → 20%, 100–1000 lux → 50%) - improves perceived contrast and battery life. |
| Selectable 500 kHz / 1 MHz switching | Permits trade-off between inductor size (smaller at 1 MHz) and efficiency (higher at 500 kHz) - accommodates diverse mechanical constraints. |
| Four programmable OVP thresholds | Prevents catastrophic failure during LED open-circuit faults by halting boost operation before COUT exceeds safe limits - enhances field reliability. |
| Thermal shutdown (140°C) | Protects die during sustained high-power operation (e.g., full-brightness backlight + indicator LEDs); auto-resumes at 125°C - avoids permanent latch-up. |
Applications
| Display Backlight Control | Keypad Illumination |
|---|---|
|
Use Scenario: Driving dual WLED strings (8–10 LEDs each) for smartphone LCD backlight under varying ambient light conditions. IC Role / Device Role / Timing Role: LM3533TMX-40A/NOPB acts as primary power source and brightness controller - regulating HVLED1/HVLED2 current via boost converter and adapting output using ALS or PWM inputs. Use Value: Delivers uniform luminance with ±1% HVLED matching and 14-bit exponential dimming, extending battery runtime through ambient-adaptive current scaling. |
Use Scenario: Illuminating alphanumeric keypad with consistent brightness across all keys, regardless of battery voltage sag. IC Role / Device Role / Timing Role: LM3533TMX-40A/NOPB supplies regulated current to HVLED1/HVLED2 configured as keypad strings, maintaining constant luminance via closed-loop headroom regulation. Use Value: Maintains visible key illumination down to 2.7 V VIN with <250 mV headroom voltage - eliminates dimming during low-battery operation. |
| RGB Indicator Driver | Smartphone Status Notification |
|
Use Scenario: Driving red/green/blue indicator LEDs with independent current control and synchronized blinking patterns. IC Role / Device Role / Timing Role: LM3533TMX-40A/NOPB assigns LVLED1–LVLED3 to separate control banks (C/D/E) and programs distinct pattern generators for hue mixing and animation. Use Value: Achieves precise color balance (<2% LVLED matching) and smooth transitions using hardware-based ramping - offloads animation logic from application processor. |
Use Scenario: Providing visual alerts (e.g., incoming call, message, charging) using programmable blink sequences on LVLED4/LVLED5. IC Role / Device Role / Timing Role: LM3533TMX-40A/NOPB executes autonomous blink patterns via Pattern Generator 4 assigned to Bank F - operates without host intervention during sleep mode. Use Value: Reduces system power consumption by >30% versus GPIO-driven indicators, while enabling complex multi-phase notifications (e.g., slow pulse → fast flash → solid). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3532TMX-40A/NOPB | Lacks integrated charge pump; only drives two HVLED strings (no LVLED sinks); no ALS interface or pattern generators. | Suitable only for display backlight-only designs without indicator LEDs or ambient sensing. | Select LM3533TMX-40A/NOPB when both HVLED backlight and LVLED indicators require unified control and ALS adaptation. |
| TPS61165RTVR | Single-output boost driver (no charge pump); supports only one HVLED string; no I²C interface - uses analog dimming and EN/PWM only. | Targeted at cost-sensitive, non-programmable backlight applications with fixed brightness levels. | Choose LM3533TMX-40A/NOPB where dual-string drive, RGB indicator control, and firmware-configurable behavior are required. |
Compared with LM3532TMX-40A/NOPB and TPS61165RTVR, LM3533TMX-40A/NOPB uniquely integrates boost + charge pump + ALS + pattern generation in one DSBGA package - enabling full smartphone illumination control with minimal external components and no host CPU overhead.
Availability
LM3533TMX-40A/NOPB is available at Aetrix Electronics and suitable for smartphone display backlight, keypad illumination, and RGB indicator lighting requiring stable component supply across high-volume production cycles.
Supply support for LM3533TMX-40A/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 ICs for portable electronics.
The LM3533 product line was designed specifically for complete illumination power solutions in space-constrained mobile handsets - integrating boost, charge pump, ALS processing, and pattern generation to replace multiple discrete drivers and controllers.
FAQ
What is the maximum output voltage capability of the LM3533TMX-40A/NOPB boost converter?
The LM3533TMX-40A/NOPB boost converter supports up to 40 V output voltage, as confirmed by its OVP protection thresholds (16 V, 24 V, 32 V, and 40 V) and absolute maximum rating of 45 V on HVLED1/HVLED2 pins. This enables driving long series strings of white LEDs - for example, eight to ten 3.2-V WLEDs per string - making LM3533TMX-40A/NOPB suitable for high-resolution smartphone displays requiring uniform backlighting.
How does the LM3533TMX-40A/NOPB handle ambient light sensing without an external ADC?
The LM3533TMX-40A/NOPB integrates an 8-bit ADC dedicated to the ALS input, with internal low-pass filtering and 128 programmable gain-setting resistors. It digitizes ambient light sensor signals (as low as 3 mV) and maps results to five user-configurable brightness zones - each linked to target current values for assigned LED control banks. This eliminates external signal conditioning and ADC components, allowing LM3533TMX-40A/NOPB to autonomously adjust LED brightness based on ambient conditions.
Can the LM3533TMX-40A/NOPB drive both high-voltage and low-voltage LEDs simultaneously?
Yes, the LM3533TMX-40A/NOPB simultaneously powers two high-voltage LED strings (HVLED1/HVLED2) via its integrated boost converter and five low-voltage indicator LEDs (LVLED1–LVLED5) via its 2× charge pump. The charge pump generates ~4.4 V at CPOUT to bias LVLEDs, while the boost converter delivers up to 40 V to HVLED strings - all from a single 2.7–5.5 V input. This dual-path architecture makes LM3533TMX-40A/NOPB ideal for smartphones needing coordinated backlight and indicator control.
What is the purpose of the four pattern generators in the LM3533TMX-40A/NOPB?
The LM3533TMX-40A/NOPB includes four independent hardware pattern generators, each assignable to a control bank (C–F), to autonomously execute blinking sequences on LVLED1–LVLED5. Each generator supports programmable rise/fall times, on/off delays, and high/low current levels - enabling complex notifications (e.g., breathing effects, multi-color cycling) without host processor involvement. This reduces system power and firmware complexity, making LM3533TMX-40A/NOPB especially valuable in always-on indicator applications.
Does the LM3533TMX-40A/NOPB support I²C communication at standard-mode speeds?
Yes, the LM3533TMX-40A/NOPB supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C communication on SCL/SDA pins, with specified timing requirements including t1 (clock period ≥2.5 µs) and t2 (data setup ≥100 ns). Its I²C interface allows full read/write access to 32+ configuration registers - enabling dynamic reprogramming of LED currents, dimming curves, ALS zones, pattern parameters, and OVP thresholds during system operation - a core capability of LM3533TMX-40A/NOPB in adaptive illumination systems.
LM3533TMX-40A/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:
- Step-Up (Boost), Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 7
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 30mA
- Frequency:
- 500kHz, 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DSBGA
LM3533TMX-40A/NOPB FAQ
1.How can I place an order for LM3533TMX-40A/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3533TMX-40A/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 LM3533TMX-40A/NOPB reliable?
The price and inventory of LM3533TMX-40A/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3533TMX-40A/NOPB is usually 5 days.
3.What payment methods are accepted for LM3533TMX-40A/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3533TMX-40A/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3533TMX-40A/NOPB?
LM3533TMX-40A/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3533TMX-40A/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 LM3533TMX-40A/NOPB?
For technical support, including LM3533TMX-40A/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3533TMX-40A/NOPB requirements.
6.How does Aetrix verify that LM3533TMX-40A/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3533TMX-40A/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 LM3533TMX-40A/NOPB meets industry standards.
7.What is the process for return or replacement of LM3533TMX-40A/NOPB?
All LM3533TMX-40A/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3533TMX-40A/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 LM3533TMX-40A/NOPB part is unused and in its original packaging.
Return procedure for LM3533TMX-40A/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3533TMX-40A/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
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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