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Texas Instruments LP3936SL
- Part No.:
- LP3936SL
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-WFLGA
- Datasheet:
-
LP3936SL.pdf
- Description:
- IC LED DRV RGLTR PWM 32TLGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,394
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Product details
Overview
LP3936SL 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/MicroWire interface, ambient light sensing via 8-bit ADC, and programmable PWM dimming with 8-bit current control - deployed in cellular phone main/sub-display backlighting and camera flash subsystems.
For engineers reviewing the LP3936SL datasheet, LP3936SL pinout, LP3936SL application, or LP3936SL equivalent, this page delivers verified technical context on its dual-LED-group constant-current architecture, boost voltage programmability (4.1–5.3 V), thermal shutdown behavior, 32-pin TLGA package layout, and validated alternative options for display lighting subsystem design.
Technical Context
The LP3936SL implements a CPM (Current-Programmed Mode) magnetic boost converter with PFM/PWM mode selection, 1 MHz switching frequency (RT = 82 kΩ), and output voltage programmable across nine 8-bit register steps. Its dual WLED groups (WLED1–WLED4 and WLED5–WLED6) provide matched 1% typical current accuracy per channel, independently adjustable via 8-bit registers.
RGB functionality uses three open-drain PWM outputs (ROUT, GOUT, BOUT) supporting programmable color mixing, blinking patterns, and FLASH mode with 120 mA max per channel. The integrated 8-bit ADC samples ambient light via AIN/AREF with 64-sample averaging and startup time of 100 ms - enabling closed-loop brightness adaptation without external controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 4.1–5.3 V in 9 steps; enables optimization for varying LED forward voltage stacks and efficiency tuning. |
| WLED Current Range | 0–25 mA per LED across six channels; two independent 4+2 groups with 1% typical matching for uniform backlight intensity. |
| RGB/FLASH Current | Up to 120 mA per channel (ROUT/GOUT/BOUT); supports high-brightness camera flash and dynamic color indication. |
| Interface Support | I²C (36h slave address) and MicroWire/SPI modes selectable via MW_SEL pin; logic IO compatible down to 1.65 V. |
| Ambient Light ADC | 8-bit dual-slope ADC with 64-sample averaging; input range 1.23–2.46 V referenced to AREF = 1.23 V; 100 ms startup. |
| Thermal Protection | Internal thermal shutdown engages at TJ ≈ 160°C and releases at ≈140°C; prevents damage during sustained high-power LED operation. |
| Supply Current (Standby) | 1 µA typical (VDD1/VDD2) with NSTBY = L; enables ultra-low-power display retention in mobile sleep states. |
Pinout & Package
LP3936SL is housed in a space-efficient 32-pin TLGA laminate package (4.5 × 5.5 × 0.8 mm, 0.5 mm pitch), optimized for thin portable PCBs with thermal pad exposed on bottom side.
| 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 switching noise. |
| FB | Boost Feedback Input | Senses regulated output voltage; connects to resistor divider for programmable VOUT setting (4.1–5.3 V). |
| WLED1–WLED6 | Open-Drain LED Outputs | Drive white LEDs cathode-side; each supports 0–25 mA with 8-bit digital current control and matched accuracy. |
| ROUT/GOUT/BOUT | RGB Open-Drain Outputs | Drive red/green/blue LED anodes; support 120 mA max per channel with PWM dimming and FLASH sequencing. |
| AIN/AREF | ADC Input/Reference | AIN accepts photodiode/phototransistor signal; AREF provides stable 1.23 V reference for ambient light measurement. |
| SCL/CS/DI/DO/MW_SEL | Serial Interface Pins | Configurable for I²C (SCL/CS=SDA) or MicroWire (SCL/DI/DO/CS); MW_SEL selects protocol at power-up. |
| NRST | Active-Low Reset | Asynchronous reset input; forces all registers to default values including 4.55 V boost output and disabled boost. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Boost Converter | 250 mA magnetic boost with 8-bit VOUT control (4.1–5.3 V) and PFM/PWM mode selection for efficiency vs load optimization. |
| Dual Independent WLED Groups | 4+2 architecture (WLED1–4 and WLED5–6) with separate 8-bit current registers and 1% typical matching for multi-zone backlighting. |
| RGB + FLASH Capability | Three PWM-driven outputs (ROUT/GOUT/BOUT) supporting both static color mixing and synchronized 120 mA flash bursts. |
| Integrated Ambient Light Sensing | On-chip 8-bit ADC with 64-sample averaging, 100 ms startup, and AREF = 1.23 V reference - eliminates external sensor IC. |
| Low-Voltage Logic Interface | 1.65–6.0 V VDD_IO support with I²C/MicroWire compatibility; enables direct interfacing with 1.8 V baseband processors. |
Applications
| Main Display Backlight | Sub Display Backlight |
|---|---|
|
Use Scenario: Driving 4–6 white LEDs behind primary LCD panel in smartphones and PDAs under variable ambient light. IC Role / Device Role / Timing Role: Constant-current WLED driver with programmable 0–25 mA per channel and ambient-adaptive dimming via integrated ADC. Use Value: Eliminates need for external DACs or microcontroller-based brightness control; achieves uniform luminance across display area with <1% current mismatch. |
Use Scenario: Powering secondary monochrome or small-color LCD in clamshell phones or dual-screen devices. IC Role / Device Role / Timing Role: Secondary WLED group (WLED5–WLED6) with independent 8-bit current control and shared boost supply. Use Value: Reduces BOM count by reusing same IC for both main and sub backlights while maintaining independent brightness calibration. |
| Camera Flash Control | RGB Status Indication |
|
Use Scenario: Delivering high-current burst illumination for smartphone camera modules during photo capture. IC Role / Device Role / Timing Role: FLASH-mode driver using ROUT/GOUT/BOUT with synchronized 120 mA per channel and programmable pulse timing. Use Value: Enables true white flash without external MOSFETs or timing controllers; supports pre-flash AF assist and video torch modes. |
Use Scenario: Generating user-visible status colors (e.g., charging, notification, Bluetooth pairing) on front-panel LEDs. IC Role / Device Role / Timing Role: RGB PWM generator with independent 8-bit color channel control and programmable blink patterns. Use Value: Replaces discrete RGB LED drivers and MCU GPIO resources; supports smooth color transitions and low-power idle states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED lighting management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single 40 V boost with 30 mA WLED driver only; no RGB, no ADC, no dual-WLED grouping. | Limited to basic single-display backlight; lacks ambient sensing and multi-channel color control. | Choose when only main-display backlight is needed and cost sensitivity outweighs feature set. |
| LM3530UMX/NOPB | 6-channel WLED driver with I²C interface and ambient light ADC, but no integrated boost converter - requires external 5 V rail. | Suitable for systems with pre-regulated 5 V supply; cannot operate directly from Li-ion battery like LP3936SL. | Select if board already provides stable 5 V and RGB/FLASH functionality is not required. |
Compared with TPS61165DRVR and LM3530UMX/NOPB, the LP3936SL uniquely integrates magnetic boost, dual-group WLED control, RGB/FLASH drivers, and ambient ADC in one 32-pin TLGA package - enabling complete display lighting subsystems from single Li-ion cells without external power conversion or sensor components.
Availability
LP3936SL is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display illumination, and camera flash subsystems requiring stable component supply across high-volume consumer electronics production.
Supply support for LP3936SL 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 delivering analog, embedded processing, and connectivity solutions with emphasis on power efficiency and system integration.
The LP3936SL belongs to TI's portable lighting management product line, designed specifically to consolidate backlight, flash, and ambient-sensing functions into single-chip solutions for battery-powered handheld devices.
FAQ
What is the maximum total current the LP3936SL boost converter can deliver?
The LP3936SL boost converter supports up to 250 mA continuous output current, as specified in its Electrical Characteristics table under "Recommended Load Current." This rating applies across the full operating temperature range (−40°C to +85°C) and enables simultaneous driving of all six white LEDs plus RGB/FLASH loads when configured for peak performance. The LP3936SL internal current limit protects against overload with a typical 750 mA switch current threshold.
How does the LP3936SL handle ambient light sensing without an external ADC?
The LP3936SL integrates a dedicated 8-bit dual-slope ADC with 64-sample averaging, using AIN as input and AREF as a precise 1.23 V internal reference. It digitizes photodiode or phototransistor signals directly, storing results in register 0Ch after a 100 ms startup delay. The LP3936SL ADC eliminates need for external conversion circuitry while providing sufficient resolution for automatic display brightness adaptation in mobile devices.
Can the LP3936SL drive both main and sub displays independently?
Yes - the LP3936SL features two independent WLED groups: WLED1–WLED4 (main display) and WLED5–WLED6 (sub display), each with separate 8-bit current control registers and matched 1% typical current accuracy. This allows independent brightness calibration and dimming profiles for dual-display systems without external multiplexing or additional drivers. The LP3936SL maintains consistent luminance across both zones using shared boost regulation.
What interface protocols does the LP3936SL support, and how is selection performed?
The LP3936SL supports both I²C and MicroWire/SPI serial interfaces, selected by the logic level on the MW_SEL pin at power-up: MW_SEL = 1 enables MicroWire mode (SCL/DI/DO/CS), while MW_SEL = 0 configures I²C mode (SCL/CS=SDA). Both protocols use the same 16 internal registers and support full read/write access. The LP3936SL operates with VDD_IO as low as 1.65 V, ensuring compatibility with modern low-voltage baseband processors.
Is thermal protection built into the LP3936SL, and how does it behave?
Yes - the LP3936SL includes internal thermal shutdown that activates at approximately 160°C junction temperature and resets at ~140°C. During thermal events, the device enters STARTUP mode until safe temperature is restored, disabling all outputs to prevent damage. This protection is fully autonomous and requires no external circuitry. The LP3936SL's 72°C/W θJA (TLGA package) necessitates proper PCB copper pour under the thermal pad for reliable operation at full 250 mA load.
LP3936SL 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)
LP3936SL FAQ
1.How can I place an order for LP3936SL through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3936SL 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 LP3936SL reliable?
The price and inventory of LP3936SL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3936SL is usually 5 days.
3.What payment methods are accepted for LP3936SL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3936SL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3936SL?
LP3936SL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3936SL 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 LP3936SL?
For technical support, including LP3936SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3936SL requirements.
6.How does Aetrix verify that LP3936SL is sourced from the original manufacturer or authorized distributors?
All LP3936SL 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 LP3936SL meets industry standards.
7.What is the process for return or replacement of LP3936SL?
All LP3936SL units undergo pre-shipment inspection (PSI). If there is an issue with LP3936SL, 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 LP3936SL part is unused and in its original packaging.
Return procedure for LP3936SL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3936SL Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
Microchip Technology
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CL2N8-G
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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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