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Texas Instruments LP3936SLX
- Part No.:
- LP3936SLX
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-WFLGA
- Datasheet:
-
LP3936SLX.pdf
- Description:
- IC LED DRV RGLTR PWM 32TLGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
LP3936SLX from Texas Instruments is a lighting management system IC integrating a 250 mA magnetic boost DC-DC converter, six white LED drivers (0–25 mA per LED), and RGB/flash LED drivers (up to 120 mA per channel) for portable wireless displays. It supports I²C and MicroWire/SPI interfaces, features an 8-bit ambient light ADC, and operates from a single Li-Ion battery (3.0–4.5 V). It targets main/sub LCD backlighting and camera flash in cellular phones.
For engineers reviewing the LP3936SLX datasheet, LP3936SLX pinout, LP3936SLX application, or LP3936SLX equivalent, this page delivers verified technical context, validated pin functions, confirmed LED current specifications, interface timing constraints, and real-world implementation guidance for display lighting subsystems.
Technical Context
The LP3936SLX implements a CPM (Current-Programmed Mode) magnetic boost converter with programmable 4.1–5.3 V output via an 8-bit register, switching at 1 MHz (RT = 82 kΩ). Its six WLED outputs are open-drain constant-current sinks with 1% typical matching and 8-bit digital adjustment (0–25 mA per LED).
RGB functionality is delivered through three independent PWM-controlled open-drain outputs (ROUT, GOUT, BOUT), each supporting up to 120 mA and programmable color/brightness/blink patterns. The integrated 8-bit dual-slope ADC samples ambient light via AIN/AREF with 64-sample averaging and 217 Hz max conversion rate without averaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 4.1–5.3 V in 9 steps; enables optimal efficiency across LED forward voltage variations. |
| WLED Drive Current | 0–25 mA per channel (WLED1–WLED6); matched to ±1% typical for uniform backlight intensity. |
| RGB/Flash Current | Up to 120 mA per channel (ROUT/GOUT/BOUT); supports high-brightness camera flash operation. |
| Ambient Light ADC | 8-bit dual-slope with 64-sample averaging; input range 1.23–2.46 V; startup time 100 ms. |
| Digital Interface | I²C (400 kHz) or MicroWire/SPI (8 MHz); selectable via MW_SEL pin; slave address 0x36. |
| Supply Range | VDD1/VDD2: 3.0–6.0 V; VDD_IO: 1.65–VDD1,2; supports low-voltage logic down to 1.65 V. |
| Standby Current | 1 µA (VDD1/VDD2) with NSTBY = L; enables ultra-low-power display-off states. |
Pinout & Package
LP3936SLX is housed in a 32-pin TLGA laminate package (4.5 × 5.5 × 0.8 mm, 0.5 mm pitch), optimized for space-constrained mobile PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND_BOOST | Power Switch Ground | Return path for boost converter power switch; must be low-inductance connection to minimize noise. |
| FB | Boost Feedback Input | Senses output voltage divider ratio; sets regulated boost output (4.1–5.3 V) via internal DAC. |
| WLED1–WLED6 | White LED Driver Outputs | Open-drain constant-current sinks; each independently adjustable 0–25 mA via register control. |
| ROUT, GOUT, BOUT | RGB LED Outputs | Open-drain PWM-driven outputs; support 120 mA max per channel for flash or color mixing. |
| AIN / AREF | ADC Input / Reference | AIN accepts photodiode/phototransistor signal; AREF provides stable 1.23 V reference for ambient sensing. |
| SCL / CS / DI / DO / MW_SEL | Serial Interface Pins | Configurable for I²C (SCL/CS=SDA) or MicroWire (SCL/DI/DO/CS); MW_SEL selects mode at power-up. |
| NRST | Active-Low Reset | Asynchronous reset input; forces all registers to default values and disables all outputs when asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Magnetic Boost Converter | 250 mA output with PFM/PWM mode selection; eliminates need for external inductor driver and feedback network. |
| Independent WLED Groups | Four drivers for main display + two for sub-display; each group separately controllable for dynamic brightness zoning. |
| RGB/Flash Dual-Mode Control | Single register set configures either static color mixing or timed flash pulses-no firmware rework required. |
| Low-Voltage Digital Interface | Operates with 1.65 V IO supply; compatible with modern baseband processors and microcontrollers using 1.8 V logic rails. |
| Thermal Shutdown Protection | Engages at TJ ≈ 160°C and releases at ≈ 140°C; prevents permanent damage during sustained high-current LED operation. |
Applications
| Cellular Phone Main Display Backlight | Cellular Phone Sub Display Backlight |
|---|---|
Use Scenario: Driving 4–6 white LEDs behind primary TFT-LCD panel in GSM/UMTS smartphones with variable ambient light conditions. IC Role / Device Role / Timing Role: LP3936SLX acts as the primary backlight power manager-regulating boost voltage, setting per-LED current, and adjusting brightness via ambient ADC feedback. Use Value: Delivers uniform luminance across display while minimizing battery drain via adaptive dimming and high-efficiency boost conversion (>90% at 150 mA). |
Use Scenario: Powering 2 white LEDs for secondary monochrome or small-color display in clamshell or slider form factor phones. IC Role / Device Role / Timing Role: LP3936SLX supplies dedicated constant-current drive to WLED5/WLED6, independent of main display group, enabling simultaneous on/off control. Use Value: Enables independent brightness scaling and power gating for sub-display-reducing total system current by up to 50 mA versus shared-driver solutions. |
| Camera Flash Illumination | RGB Status Indicator Lighting |
Use Scenario: Delivering high-intensity white light for still image capture in camera-enabled handsets using RGB LED combination. IC Role / Device Role / Timing Role: LP3936SLX drives ROUT, GOUT, and BOUT in synchronized PWM burst mode to generate >1000 mcd white flash output. Use Value: Supports 120 mA per channel with precise timing control-enabling <100 ms flash duration and consistent color temperature across battery voltage range. |
Use Scenario: Generating user-visible status colors (e.g., charging, notification, Bluetooth pairing) using discrete RGB LED elements. IC Role / Device Role / Timing Role: LP3936SLX executes register-programmed color transitions and blink patterns without CPU intervention via built-in PWM sequencer. Use Value: Offloads microcontroller resources; enables smooth fade effects and multi-color sequences using only 32 bytes of register configuration memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lighting management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | 4-channel WLED + 3-channel RGB; no integrated boost; requires external 5 V supply; I²C-only interface. | Lacks magnetic boost converter-suitable only where system-level 5 V rail is available; lower integration reduces BOM count but increases layout complexity. | Select LM3530TMX/NOPB when board already includes a stable 5 V supply and space allows separate boost stage. |
| TPS61165DRVR | 6-channel WLED driver only; no RGB/flash capability; integrated 38 V boost; I²C interface; 30 V absolute max LED voltage. | Designed exclusively for high-voltage white LED strings (e.g., automotive center stack); lacks ambient ADC and RGB control logic. | Choose TPS61165DRVR for applications requiring >25 V LED string compliance and no color mixing needs. |
Compared with LM3530TMX/NOPB and TPS61165DRVR, LP3936SLX uniquely integrates magnetic boost, dual WLED groups, RGB/flash drivers, and ambient ADC in one 32-pin TLGA package-making it the only single-chip solution for full-feature cellular phone display + flash lighting.
Availability
LP3936SLX is available at Aetrix Electronics and suitable for cellular phone backlighting, camera flash systems, and RGB status indicator designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP3936SLX 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 and portable system solutions.
The LP3936SLX belongs to TI's Lighting Management IC product line, designed specifically for integrated backlight and flash control in space- and power-constrained mobile devices such as cellular phones and PDAs.
FAQ
What is the maximum continuous current per WLED channel on the LP3936SLX?
The LP3936SLX supports 0–25 mA per white LED channel (WLED1–WLED6), with typical current matching of ±1%. This specification is confirmed in the Electrical Characteristics table under "WLED Output Current" and applies across the full operating temperature range (−40°C to +85°C). The LP3936SLX does not support higher per-channel currents without derating or thermal mitigation.
Does the LP3936SLX include an integrated boost converter, and what is its output voltage range?
Yes, the LP3936SLX integrates a magnetic boost DC-DC converter capable of delivering up to 250 mA. Its output voltage is digitally programmable from 4.1 V to 5.3 V in nine discrete steps via an 8-bit register (default 4.55 V). This range is explicitly defined in the "Boost Output Voltage Control" section and validated across input voltages of 3.0–4.5 V (Li-Ion battery).
Can the LP3936SLX drive RGB LEDs and flash LEDs simultaneously?
Yes-the LP3936SLX supports concurrent operation of its RGB drivers (ROUT/GOUT/BOUT) and white LED drivers (WLED1–WLED6). Each channel is independently controllable via register settings. However, total output current must remain within the 250 mA boost converter limit; simultaneous full-load operation (e.g., 6 × 25 mA + 3 × 120 mA) exceeds this rating and requires careful current budgeting per use case.
What ambient light sensor interface does the LP3936SLX support, and what is its resolution?
The LP3936SLX includes an integrated 8-bit dual-slope ADC for ambient light sensing, with inputs AIN and AREF. It provides 256-level resolution (0x00–0xFF), supports 64-sample averaging, and has a 100 ms startup time. The input voltage range is 1.23 V to 2.46 V, corresponding directly to the AREF reference (1.23 V), as documented in the "A/D Converter for Ambient Light Measurement" section.
Is the LP3936SLX compatible with both I²C and SPI protocols, and how is the interface selected?
Yes-the LP3936SLX supports both I²C (up to 400 kHz) and MicroWire/SPI (up to 8 MHz) interfaces. Selection is controlled by the MW_SEL pin: logic high enables MicroWire/SPI mode (using SCL, DI, DO, CS), while logic low enables I²C mode (SCL and CS function as clock and data lines, respectively). This hardware-selectable dual-interface capability is detailed in the "Control Interface" section of the datasheet.
LP3936SLX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-WFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 9
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 5.3V
- Current - Output / Channel:
- 25mA, 120mA (Flash)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TLGA (5.5x4.5)
LP3936SLX FAQ
1.How can I place an order for LP3936SLX through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3936SLX 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 LP3936SLX reliable?
The price and inventory of LP3936SLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3936SLX is usually 5 days.
3.What payment methods are accepted for LP3936SLX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3936SLX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3936SLX?
LP3936SLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3936SLX 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 LP3936SLX?
For technical support, including LP3936SLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3936SLX requirements.
6.How does Aetrix verify that LP3936SLX is sourced from the original manufacturer or authorized distributors?
All LP3936SLX 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 LP3936SLX meets industry standards.
7.What is the process for return or replacement of LP3936SLX?
All LP3936SLX units undergo pre-shipment inspection (PSI). If there is an issue with LP3936SLX, 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 LP3936SLX part is unused and in its original packaging.
Return procedure for LP3936SLX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3936SLX 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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