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Texas Instruments LP8501TMX/NOPB
- Part No.:
- LP8501TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 25-WFBGA
- Datasheet:
-
LP8501TMX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 25USMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP8501TMX/NOPB from Texas Instruments is a 9-output, high-side LED driver IC with integrated charge pump, programmable current sources (25.5 mA full-scale), 12-bit PWM dimming, and three independent program execution engines for autonomous lighting effects in mobile devices. It operates from 2.7V to 5.5V input and supports RGB keypad illumination, indicator lighting, and haptic feedback driving.
For engineers reviewing the LP8501TMX/NOPB datasheet, LP8501TMX/NOPB pinout, LP8501TMX/NOPB application, or LP8501TMX/NOPB equivalent, key selection considerations include adaptive 1x/1.5x charge pump efficiency (>95% at 45 mA), 10 µA typical power-save mode current, DSBGA-25 package footprint (<18 mm² solution area), and I²C-compatible control with TRIG/INT/GPO interface signals.
Technical Context
The LP8501TMX/NOPB integrates a pre-regulated switched-capacitor charge pump with automatic gain selection (1x or 1.5x) based on real-time LED forward voltage monitoring across D1–D9 outputs. Its internal 32 kHz oscillator or external CLK input synchronizes PWM timing and program engine execution.
Three independent SRAM-based program engines (96 instructions total) execute user-defined lighting sequences without MCU intervention. Each of the nine current-source outputs features per-channel 8-bit current setting resolution and group-level PWM/fade control, with flexible grouping into up to three banks (e.g., D1–D6, D7–D9, plus GPO).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output count | 9 programmable high-side current sources (D1–D9), each configurable up to 25.5 mA |
| PWM resolution | 12-bit (4096 steps), enabling precise luminance control at 312 Hz base frequency |
| Charge pump modes | Auto-select 1x (bypass) or 1.5x (regulated 4.5 V) gain; achieves ≥95% LED drive efficiency at 45 mA load |
| Supply current | 10 µA typical in power-save mode; 0.6–1.8 mA normal mode depending on charge pump state |
| Interface | I²C-compatible 2-wire (SCL/SDA), plus dedicated TRIG, INT, EN, and GPO pins for autonomous operation |
| Package | DSBGA-25 (YFQ0025), 2.26 mm × 2.26 mm × 0.60 mm, 0.4 mm pitch, thermal resistance θJA = 87°C/W |
| Operating temp | −30°C to +85°C ambient; junction temperature rated to +125°C with thermal shutdown at +150°C |
Pinout & Package
LP8501TMX/NOPB uses a 25-bump thin DSBGA package (YFQ0025) with 0.4 mm pitch, optimized for space-constrained mobile applications. The package provides separate power domains (VDD1_6 for D1–D6, VDD7_9 for D7–D9) and dual flying capacitor interfaces (C1±, C2±) for charge pump operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (D1) | Current source output 1 | High-side LED driver output, 8-bit programmable current (0–25.5 mA), 60–100 mV saturation voltage at 17.5 mA |
| A2 (D2) | Current source output 2 | Independent high-side driver with matching ≤1% (typ.) vs. other D1–D9 outputs |
| A3 (VOUT) | Charge pump output | Regulated output node supplying D1–D9; auto-switches between 1x (VIN) and 1.5x (~4.5 V) modes |
| A4 (C2−), A5 (C2+) | Flying capacitor 2 terminals | Second 0.47 µF ceramic capacitor connection for charge pump phase switching |
| B1 (D3)–E1 (D9) | Current source outputs 3–9 | All nine outputs support identical current programming, PWM control, and open/short detection |
| C4 (EN) | Enable input | Active-high digital enable; device enters power-save mode when low or CHIP_EN bit = 0 |
| D3 (INT) | Open-drain interrupt | Signals program completion, error condition (LED open/short), or timer expiry to host MCU |
| E2 (GPO) | General-purpose output | Configurable digital output (push-pull or open-drain), usable as control signal for auxiliary circuitry |
| E4 (SDA), E5 (SCL) | I²C data/clock | Standard 400 kHz I²C interface; supports register read/write, program loading, and LED test results |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous lighting engine | Three independent SRAM-based program engines (96 instructions total) execute lighting sequences without host MCU involvement |
| Adaptive charge pump | Real-time VOUT headroom monitoring triggers seamless 1x ↔ 1.5x gain switching to sustain >95% efficiency across Li-Ion voltage range (2.7–5.5 V) |
| Flexible output grouping | All 9 drivers + GPO can be assigned to up to three groups, each with independent PWM, fade-in/fade-out, and timing control |
| Built-in LED diagnostics | On-demand open-circuit and short-circuit detection per output; forward voltage measurement capability via LED test register |
| Ultra-low idle power | 10 µA typical supply current in power-save mode; automatic entry when all outputs inactive for >50 ms |
Applications
| RGB Keypad Illumination | Indicator Light Sequencing |
|---|---|
|
Use Scenario: Backlighting alphanumeric keypads in smartphones and feature phones using discrete red/green/blue LEDs per key. IC Role / Device Role / Timing Role: LP8501TMX/NOPB acts as autonomous RGB current controller, driving D1–D3 (R), D4–D6 (G), D7–D9 (B) with synchronized 12-bit PWM and per-group fade timing. Use Value: Eliminates MCU GPIO overhead and firmware complexity while delivering smooth color transitions and consistent brightness across battery voltage range. |
Use Scenario: Status indication for charging, notifications, and system events using multi-color LED arrays on portable electronics. IC Role / Device Role / Timing Role: LP8501TMX/NOPB serves as programmable indicator manager, assigning D1–D6 to primary alerts and D7–D9 + GPO to secondary functions with independent timing engines. Use Value: Enables factory-programmed visual patterns (blink, breathe, chase) without runtime MCU intervention, reducing BOM and firmware maintenance. |
| Haptic Feedback Driver | Sub-display Backlight Control |
|
Use Scenario: Driving vibration-motor-equivalent LED pulses to provide tactile feedback during touch interactions. IC Role / Device Role / Timing Role: LP8501TMX/NOPB configures D1–D3 as synchronized high-current pulse sources (25.5 mA, 12-bit PWM) triggered by TRIG pin or I²C command. Use Value: Delivers deterministic, low-latency visual haptics with <100 µs VOUT turn-on time and no software stack dependency. |
Use Scenario: Powering small OLED or segmented LCD sub-displays requiring uniform, dimmable backlight in wearables and IoT devices. IC Role / Device Role / Timing Role: LP8501TMX/NOPB operates as compact backlight driver, using D1–D6 for main zone and D7–D9 for edge zone with group-level PWM scaling. Use Value: Achieves <18 mm² total solution size with four 0.47 µF/1 µF MLCCs, supporting ultra-thin form factors and extended battery life via 10 µA power-save mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP55231RSBT | 6-channel, 25 mA sink drivers; integrated 1.5x charge pump; no autonomous program memory | Lacks SRAM-based lighting engines - requires continuous MCU I²C control for sequencing | Choose LP55231RSBT when simpler, lower-pin-count 6-output control suffices and MCU resources are available for real-time management. |
| TPS61165DRVR | Single-output, 40 mA boost LED driver with analog/digital dimming; no multi-channel or program engine capability | Designed for single-string backlighting only; no grouping, no autonomous operation, no diagnostic features | Choose TPS61165DRVR only for cost-sensitive single-LED applications where programmability and diagnostics are unnecessary. |
Compared with LP55231RSBT and TPS61165DRVR, the LP8501TMX/NOPB uniquely delivers nine autonomous, programmable current sources with adaptive charge pump efficiency and built-in LED diagnostics - making it the only option for space-constrained mobile devices requiring zero-MCU lighting effects.
Availability
LP8501TMX/NOPB is available at Aetrix Electronics and suitable for RGB keypad illumination, indicator light sequencing, haptic feedback driving, sub-display backlight control, and programmable current source applications requiring stable component supply and long-term industrial availability.
Supply support for LP8501TMX/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, with decades of expertise in power management and lighting control ICs.
The LP8501TMX/NOPB belongs to TI's Lighting Management Unit (LMU) product line, engineered specifically for autonomous, low-power LED lighting in battery-powered mobile and portable electronics.
FAQ
What is the maximum output current per channel on the LP8501TMX/NOPB?
The LP8501TMX/NOPB supports a full-scale current of 25.5 mA per output (D1–D9), set via an 8-bit current register. Output current accuracy is ±4% at 17.5 mA, with channel-to-channel matching of ≤1% (typ.), ensuring uniform brightness across multi-LED arrays driven by LP8501TMX/NOPB.
Does the LP8501TMX/NOPB require external clocking for operation?
No - the LP8501TMX/NOPB includes an internal 32 kHz oscillator and can operate autonomously without external clocking. However, an external 32.7 kHz square-wave CLK signal may be applied to pin D4 to improve timing precision or synchronize multiple devices; LP8501TMX/NOPB defaults to internal clock if CLK is grounded or left floating.
How does the LP8501TMX/NOPB achieve high efficiency across varying input voltages?
The LP8501TMX/NOPB uses adaptive charge pump gain selection: it monitors VOUT headroom and automatically switches between 1x (bypass) and 1.5x (regulated ~4.5 V) modes. This maintains >95% LED drive efficiency from 2.7 V to 5.5 V input, as confirmed by TI's Figure 5 and Figure 6 efficiency curves in the LP8501TMX/NOPB datasheet.
Can the LP8501TMX/NOPB drive red, green, and blue LEDs simultaneously with independent control?
Yes - the LP8501TMX/NOPB supports full independent control of all nine outputs. Users can assign D1–D3 to red, D4–D6 to green, and D7–D9 to blue LEDs, configure each with unique 12-bit PWM patterns and 8-bit current settings, and group them for synchronized or staggered effects - all executed autonomously by LP8501TMX/NOPB's three program engines.
What package type and dimensions does the LP8501TMX/NOPB use?
The LP8501TMX/NOPB is packaged in a 25-bump DSBGA (YFQ0025) measuring 2.26 mm × 2.26 mm × 0.60 mm with 0.4 mm pitch. Its compact footprint enables <18 mm² total solution area using only four low-cost MLCCs (two 0.47 µF flying caps, one 1 µF CIN, one 1 µF COUT), as specified in the LP8501TMX/NOPB application diagrams.
LP8501TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 9
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.5V
- Current - Output / Channel:
- 25.5mA
- Frequency:
- 1.25MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-uSMD
LP8501TMX/NOPB FAQ
1.How can I place an order for LP8501TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8501TMX/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 LP8501TMX/NOPB reliable?
The price and inventory of LP8501TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8501TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LP8501TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8501TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8501TMX/NOPB?
LP8501TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8501TMX/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 LP8501TMX/NOPB?
For technical support, including LP8501TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8501TMX/NOPB requirements.
6.How does Aetrix verify that LP8501TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8501TMX/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 LP8501TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LP8501TMX/NOPB?
All LP8501TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8501TMX/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 LP8501TMX/NOPB part is unused and in its original packaging.
Return procedure for LP8501TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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