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Texas Instruments LP3936SL/NOPB
- Part No.:
- LP3936SL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-WFLGA
- Datasheet:
-
LP3936SL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 32TLGA
- Quantity:
- Payment:
- Shipping:
Inventory:336
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Product details
Overview
LP3936SL/NOPB 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, 8-bit ambient light ADC, and programmable output voltage (4.1–5.3 V) - used in cellular phone main/sub-display backlighting and camera flash control.
For engineers reviewing the LP3936SL/NOPB datasheet, LP3936SL/NOPB pinout, LP3936SL/NOPB application, or LP3936SL/NOPB equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented functional differences, and supply-ready availability details - all grounded in TI's SNVS259D revision May 2013 datasheet.
Technical Context
The LP3936SL/NOPB implements a current-programmed mode (CPM) magnetic boost converter operating at 1 MHz (RT = 82 kΩ), with PFM/PWM mode selection and three-layer protection (overvoltage, overcurrent, duty-cycle limiting). Its dual-path LED driver architecture separates six WLED outputs (grouped as 4+2) from RGB/flash outputs (ROUT/GOUT/BOUT), each with independent 8-bit current control and matched ±1% typical current accuracy.
It integrates an 8-bit ADC with 64-sample averaging for ambient light sensing (input range: 1.23–2.46 V, startup time: 100 ms), plus low-voltage logic interface (1.65–1.8 V or 1.8–VDD₁,₂) supporting both I²C (36h slave address) and MicroWire/SPI protocols via MW_SEL pin configuration - enabling adaptive brightness control and color-blending in battery-powered handheld devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Programmable 4.1–5.3 V in 9 steps; enables optimization for LED forward voltage variation and efficiency across Li-ion battery discharge (3.0–4.5 V). |
| WLED Current Range | 0–25 mA per LED (8-bit adjustable); supports precise dimming for main (4×) and sub (2×) LCD backlights with ±1% matching. |
| RGB/Flash Current | Up to 120 mA per channel (ROUT/GOUT/BOUT); sufficient for camera flash illumination or RGB status indication without external drivers. |
| Ambient Light ADC | 8-bit with 64-sample averaging; input range 1.23–2.46 V (referenced to AREF = 1.23 V); enables closed-loop auto-brightness in varying lighting conditions. |
| Digital Interface | I²C (400 kHz max) or MicroWire/SPI (8 MHz max); selectable via MW_SEL pin; supports register-based control of all functions including PWM slopes and blinking patterns. |
| Supply Voltage Range | VDD₁/VDD₂: 3.0–6.0 V; VDD_IO: 1.65–VDD₁,₂; allows direct connection to Li-ion battery and low-voltage baseband processors. |
| Standby Current | 1 µA (software-controlled); reduces system power during display-off states while retaining register state. |
Pinout & Package
LP3936SL/NOPB uses a 32-pin TLGA laminate package (4.5 × 5.5 × 0.8 mm, 0.5 mm pitch), optimized for space-constrained mobile PCBs. Pin functions are validated per TI SNVS259D datasheet Figure 1/2 and Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND_BOOST | Power Switch Ground | Return path for boost converter switch node; must be low-inductance connection to minimize EMI and thermal rise. |
| FB | Boost Feedback Input | Monitors output voltage divider ratio; sets regulated boost output (4.1–5.3 V) via internal 8-bit register control. |
| WLED1–WLED6 | White LED Driver Outputs | Open-drain constant-current sinks; each independently programmable 0–25 mA for main (WLED1–4) and sub (WLED5–6) displays. |
| ROUT/GOUT/BOUT | RGB LED Driver Outputs | Open-drain constant-current sinks; support flash mode (120 mA max/channel) or PWM color mixing with programmable intensity/slopes. |
| 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; enables firmware-driven lighting control. |
| AIN / AREF | Ambient Light Sensor Interface | AIN accepts photodiode/phototransistor current; AREF provides stable 1.23 V reference; together enable calibrated light-level measurement. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Converter | 250 mA magnetic boost with PFM/PWM mode selection and 1 MHz switching (RT = 82 kΩ); eliminates need for external inductor driver and feedback network. |
| Matched WLED Drivers | Six independent 8-bit current sources (0–25 mA) with ±1% typical matching between channels; ensures uniform backlight luminance across multi-zone displays. |
| RGB/Flash Dual-Mode Control | Three-channel PWM drivers support both static color blending and high-current flash operation (120 mA/channel); simplifies camera module integration. |
| On-Chip Ambient Light Sensing | 8-bit ADC with 64-sample averaging and dedicated AIN/AREF pins; enables robust auto-brightness without external signal conditioning. |
| Low-Voltage Logic Interface | Supports 1.65 V minimum VDD_IO; compatible with 1.8 V baseband processors and microcontrollers; reduces level-shifter count in system design. |
Applications
| Cellular Phone Main Display Backlight | Cellular Phone Sub-Display Backlight |
|---|---|
Use Scenario: Driving 4 white LEDs behind primary TFT-LCD in GSM/UMTS smartphones with Li-ion battery supply (3.0–4.5 V). IC Role / Device Role / Timing Role: LP3936SL/NOPB acts as integrated backlight power manager - generating regulated boost voltage and delivering matched constant current to each WLED. Use Value: Eliminates discrete boost + current-sink ICs; achieves <90% efficiency at 150 mA load and ±1% LED current matching for consistent brightness. |
Use Scenario: Powering 2 white LEDs for secondary monochrome or OLED sub-display in clamshell or slider phones. IC Role / Device Role / Timing Role: LP3936SL/NOPB supplies independent 0–25 mA current to WLED5/WLED6 using same boost rail and control registers as main display. Use Value: Reduces BOM count by reusing core lighting engine; enables synchronized dimming with main display via shared I²C bus. |
| Camera Flash Illumination | RGB Status Indicator |
Use Scenario: Delivering brief high-intensity light pulses for image capture in camera-enabled mobile handsets. IC Role / Device Role / Timing Role: LP3936SL/NOPB configures ROUT/GOUT/BOUT in flash mode (120 mA/channel) with synchronized turn-on timing. Use Value: Provides up to 360 mA total flash current without external MOSFETs; supports programmable pulse width and delay via register control. |
Use Scenario: Generating user-visible status colors (e.g., charging, notification, Bluetooth pairing) on compact handheld devices. IC Role / Device Role / Timing Role: LP3936SL/NOPB drives RGB LEDs with independent 8-bit PWM dimming per channel to produce >16 million colors. Use Value: Enables smooth color transitions and blinking patterns via software-defined registers - no additional MCU GPIO or timer resources required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED lighting management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | Single 30 mA boost + 6-channel WLED driver only; no RGB/flash outputs; no ambient light ADC; I²C-only interface. | Limited to backlight-only systems without camera flash or RGB status; requires external light sensor for ambient control. | Select when RGB/flash functionality is unnecessary and board space is extremely constrained (24-pin WQFN vs. 32-pin TLGA). |
| TPS61165DRVR | Standalone 30 mA boost + 6-channel WLED driver; no RGB outputs, no ADC, no flash mode; higher efficiency at light loads. | Designed for cost-sensitive backlight-only applications; lacks integrated control logic - requires external MCU for all dimming and sequencing. | Choose for simplified, lower-cost backlight solutions where full lighting management (flash, RGB, ambient sensing) is handled externally. |
Compared with LM3530TMX/NOPB and TPS61165DRVR, LP3936SL/NOPB uniquely integrates boost, six WLEDs, RGB/flash drivers, and ambient light ADC in one 32-pin package - reducing component count by ≥4 ICs and enabling unified firmware control of all lighting functions.
Availability
LP3936SL/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, camera flash modules, and RGB status indicator designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP3936SL/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 connectivity technologies for industrial, automotive, and consumer applications.
The LP3936SL/NOPB belongs to TI's Lighting Management IC product line, designed specifically for integrated backlight, flash, and status lighting control in space- and power-constrained portable wireless devices.
FAQ
What is the maximum total current capability of the LP3936SL/NOPB boost converter?
The LP3936SL/NOPB boost converter supports up to 250 mA continuous output current, as specified in the Electrical Characteristics table under "Recommended Load Current." This rating applies across the full operating temperature range (−40°C to +85°C) and enables driving all six WLEDs and RGB outputs simultaneously under typical flash conditions. The IC includes overcurrent protection that limits peak switch current to 600–1050 mA depending on VDD.
Can the LP3936SL/NOPB drive LEDs directly from a Li-ion battery without using the boost converter?
Yes - the LP3936SL/NOPB supports boost standby mode via the EN_BOOST register bit. When disabled, the boost converter shuts down, and WLED/RGB outputs operate as constant-current sinks referenced to the battery voltage (3.0–4.5 V). This is viable when LED forward voltage is low (e.g., ≤3.2 V) and current requirements are modest (≤25 mA per LED), avoiding conversion losses.
How does the ambient light ADC in the LP3936SL/NOPB interface with optical sensors?
The LP3936SL/NOPB ambient light ADC uses AIN as current-input pin and AREF as 1.23 V reference output. Photodiodes (e.g., Osram SFH2400) or phototransistors (e.g., SFH3410) connect between AIN and ground, with AREF biasing the sensor. The ADC digitizes the resulting voltage (1.23–2.46 V range) into an 8-bit value readable from register 0Ch, supporting automatic brightness adjustment without external op-amps.
What are the key differences between I²C and MicroWire/SPI modes on the LP3936SL/NOPB?
Interface selection is controlled by the MW_SEL pin: high enables MicroWire/SPI (SCL, DI, DO, CS), low enables I²C (SCL, CS/SDA). MicroWire supports 8 MHz clock and two-cycle reads; I²C uses standard 400 kHz (or 200 kHz at 1.65–1.8 V) with 7-bit address 36h. Both modes access identical 16 internal registers but differ in pin mapping and timing - e.g., DO is active only during transfers in MicroWire, while CS serves as SDA in I²C.
Does the LP3936SL/NOPB support programmable blinking or fade effects for RGB LEDs?
Yes - the LP3936SL/NOPB includes dedicated PWM control registers for RGB outputs (ROUT/GOUT/BOUT) that allow independent programming of blink period, on/off time, and fade-in/fade-out slopes. These features are implemented in hardware, enabling smooth color transitions and timed indicators without consuming MCU CPU cycles or timers.
LP3936SL/NOPB 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/NOPB FAQ
1.How can I place an order for LP3936SL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3936SL/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 LP3936SL/NOPB reliable?
The price and inventory of LP3936SL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3936SL/NOPB is usually 5 days.
3.What payment methods are accepted for LP3936SL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3936SL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3936SL/NOPB?
LP3936SL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3936SL/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 LP3936SL/NOPB?
For technical support, including LP3936SL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3936SL/NOPB requirements.
6.How does Aetrix verify that LP3936SL/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3936SL/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 LP3936SL/NOPB meets industry standards.
7.What is the process for return or replacement of LP3936SL/NOPB?
All LP3936SL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3936SL/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 LP3936SL/NOPB part is unused and in its original packaging.
Return procedure for LP3936SL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3936SL/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
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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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