Specifications
| Type | Description |
|---|---|
| Part Number | LP8556 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Function | High-efficiency white LED backlight driver with asynchronous boost converter and six current sinks |
| LED Current Sink Count | 6 |
| Configurable Channel Count | 1 to 6 channels |
| Maximum LED Current Per Channel | Up to 50 mA |
| Boost Converter Topology | Asynchronous boost converter |
| Integrated Power MOSFET On Resistance | 0.19 Ω |
| Boost Switching Frequency Options | 312 kHz, 625 kHz, 1250 kHz |
| Boost Switch Input Voltage Range | 2.7 V to 36 V |
| VDD Input Voltage Range | 2.7 V to 20 V |
| Boost Switch Output Voltage Range | 7 V to 43 V |
| Supported LEDs In Series Per Channel | 3 to 12 white LEDs |
| Brightness Control Interfaces | PWM and/or I2C |
| PWM Dimming Resolution | Up to 15 bits |
| PWM Input Frequency Range | 75 Hz to 25 kHz |
| Logic Reference / Enable Pin | EN/VDDIO |
| EN/VDDIO Drive Requirement | Minimum 1 mA source capability |
| Internal LDO Output Pin | VLDO |
| Fault Protection Features | LED short detection, LED open detection, UVLO, thermal shutdown, overcurrent protection, overvoltage protection |
| Overvoltage Protection Threshold Options | Up to 6 levels |
| Ambient Operating Temperature Range | -30°C to +85°C |
| Absolute Maximum VDD Voltage | -0.3 V to 24 V |
| Absolute Maximum Logic Pin Voltage | -0.3 V to 6 V for SCL, SDA, PWM pins |
| Absolute Maximum Analog Pin Voltage | -0.3 V to 6 V for VLDO and EN/VDDIO pins |
| Absolute Maximum FSET/ISET Voltage | -0.3 V to VLDO + 0.3 V |
| Absolute Maximum LED/SW/VBOOST Voltage | -0.3 V to 50 V |
| Maximum Junction Temperature | 125°C |
| Storage Temperature Range | -65°C to +150°C |
| Maximum Lead Temperature | 260°C |
| Application | LED backlights for tablet LCDs |
| Package / Case | 20-pin DSBGA/YFQ 2.401 mm × 1.74 mm max; 24-pin WQFN/RTW 4.00 mm × 4.00 mm nominal |
| Datasheet Status | request_only |
Product Overview
The LP8556 is a Texas Instruments Power_Management LED backlight driver built around a high-efficiency white LED driver architecture. It combines an asynchronous boost converter with six current sinks, supporting device configurations from 1 to 6 LED channels. Each current-sink channel supports up to 50 mA, and the boost output range supports 3 to 12 white LEDs in series per channel.
The integrated boost converter uses a 0.19 Ω power MOSFET and supports switching-frequency options of 312 kHz, 625 kHz, and 1250 kHz. The boost switch input range is 2.7 V to 36 V, the VDD input range is 2.7 V to 20 V, and the boost switch output range is 7 V to 43 V.
Brightness control is available through PWM and/or I2C, with PWM dimming resolution up to 15 bits and a PWM input frequency range from 75 Hz to 25 kHz. The device is offered in 20-pin DSBGA/YFQ and 24-pin WQFN/RTW packages and is specified for tablet LCD LED backlights.
Key Features
- Asynchronous boost converter with six current sinks
- Configurable from 1 to 6 LED channels
- Up to 50 mA per current-sink channel
- 2.7 V to 36 V boost switch input
- 7 V to 43 V boost output range
- Supports 3 to 12 white LEDs per channel
- PWM and/or I2C brightness control
- PWM dimming resolution up to 15 bits
- 312 kHz, 625 kHz, or 1250 kHz switching
- LED fault, UVLO, thermal, current, and voltage protection
Typical Applications
- Tablet LCD LED backlights
- White LED backlight systems
- Multi-channel LED backlights
- PWM-controlled LCD backlights
- I2C-controlled LCD backlights
Procurement Notes
When requesting a quote for LP8556, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of device is the LP8556?
The LP8556 is a Texas Instruments LED backlight driver in the Power_Management category. It integrates an asynchronous boost converter and six current sinks for white LED backlight applications.
How many LED channels does the LP8556 support?
The LP8556 provides six available current-sink channels and can be configured for 1 to 6 channels. Each LED current-sink channel supports up to 50 mA.
What brightness control interfaces are supported?
Brightness control is supported through PWM and/or I2C. The PWM dimming resolution is up to 15 bits, and the PWM input frequency range is 75 Hz to 25 kHz.
What LED string range can the boost output support?
The boost switch output range is 7 V to 43 V. This range supports LED strings with 3 to 12 white LEDs in series per channel.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.