Specifications
| Type | Description |
|---|---|
| Part Number | LP55231 |
| Manufacturer | Texas Instruments |
| Product Type | SMD LED |
| Category | LED |
| Inferred Category | LED |
| Component Type | Power_IC |
| Package / Case | WQFN-24, 4.00 mm × 4.00 mm body |
| Number of LED Channels | 9; D1 to D9 current source outputs |
| Programmable Outputs | 9; with three independent program execution engines |
| Program Execution Engines | 3; independent internal program execution engines |
| Full-Scale LED Current | 25.5 mA; programmable outputs full-scale current |
| Current Setting Resolution | 8-bit; LED current setting |
| PWM Control Resolution | 12-bit; LED PWM control |
| Charge Pump Gain Modes | 1× / 1.5×; adaptive fractional charge pump |
| Charge Pump Efficiency | Up to 94%; adaptive high-efficiency charge pump |
| LED Drive Efficiency | Up to 93%; LED drive operation |
| Typical Standby Current | 200 nA; standby current typical feature value |
| Power-Save Mode Supply Current | 10 µA typical; automatic power-save mode, VDD current |
| Control Interface | Two-wire I2C-compatible; serial control interface |
| I2C Address Options | 4 pin-selectable addresses using ASEL0 and ASEL1 |
| Input Voltage Range | 2.7 V to 5.5 V; recommended VDD operating condition |
| Logic Pin Voltage Range | 0 V to VDD; recommended input or output logic pins |
| Recommended Charge Pump Load Current | 0 mA to 100 mA; recommended IOUT operating condition |
| Operating Junction Temperature | -30°C to 125°C; recommended TJ operating condition |
| Operating Ambient Temperature | -30°C to 85°C; recommended TA operating condition |
| Absolute Maximum VDD Voltage | -0.3 V to 6 V; voltage on power pin VDD |
| Absolute Maximum LED Pin Voltage | -0.3 V to VDD + 0.3 V, 6 V maximum; D1 to D9, C1-, C1+, C2-, C2+, VOUT |
| Maximum Junction Temperature | 125°C; absolute maximum TJ-MAX |
| Storage Temperature | -65°C to 150°C; absolute maximum Tstg |
| Thermal Shutdown Engage Temperature | 150°C typical; internal thermal shutdown circuitry |
| Thermal Shutdown Disengage Temperature | 130°C typical; internal thermal shutdown circuitry |
| ESD Rating HBM | ±2500 V; human-body model, ANSI/ESDA/JEDEC JS-001 |
| ESD Rating CDM | ±1000 V; charged-device model, JEDEC JESD22-C101 |
| ESD Rating Machine Model | ±250 V; all pins |
| Junction-to-Ambient Thermal Resistance | 33.3°C/W; RTW WQFN 24-pin package, RθJA |
| Junction-to-Case Top Thermal Resistance | 27.3°C/W; RTW WQFN 24-pin package, RθJC(top) |
| Junction-to-Board Thermal Resistance | 11.4°C/W; RTW WQFN 24-pin package, RθJB |
| Junction-to-Top Characterization Parameter | 0.2°C/W; RTW WQFN 24-pin package, ψJT |
| Junction-to-Board Characterization Parameter | 11.4°C/W; RTW WQFN 24-pin package, ψJB |
| Junction-to-Case Bottom Thermal Resistance | 2.2°C/W; RTW WQFN 24-pin package, RθJC(bot) |
| Standby Supply Current, EN = 0 V | 0.2 µA typical, 1 µA maximum; EN = 0 V, CHIP_EN = 0 bit, external 32-kHz clock running or not running |
| Standby Supply Current, External Clock Not Running | 1 µA typical, 1.7 µA maximum; CHIP_EN = 0 bit, external 32-kHz clock not running |
| Standby Supply Current, External Clock Running | 1.4 µA typical, 2.3 µA maximum; CHIP_EN = 0 bit, external 32-kHz clock running |
| Normal Mode Supply Current, Clock Running | 0.6 mA typical, 0.75 mA maximum; external 32-kHz clock running, charge pump and current source outputs disabled |
| Normal Mode Supply Current, 1× No Load | 0.8 mA typical, 0.95 mA maximum; charge pump in 1× mode, no load, current source outputs disabled |
| Normal Mode Supply Current, 1.5× No Load | 1.8 mA typical; charge pump in 1.5× mode, no load, current source outputs disabled |
| Power-Save Mode Supply Current, External Clock | 10 µA typical, 15 µA maximum; external 32-kHz clock running |
| Power-Save Mode Supply Current, Internal Oscillator | 0.6 mA typical, 0.75 mA maximum; internal oscillator running |
| Internal Oscillator Frequency Accuracy at 25°C | -4% to +4%; TA = 25°C |
| Internal Oscillator Frequency Accuracy Over Temperature | -7% to +7%; over operating ambient temperature range |
| Charge Pump Output Resistance, 1.5× | 3.5 Ω typical; gain = 1.5× |
| Charge Pump Output Resistance, 1× | 1 Ω typical; gain = 1× |
| Charge Pump Switching Frequency | 1.25 MHz typical; charge pump operation |
| Charge Pump Ground Current, 1.5× | 1.2 mA typical; gain = 1.5× |
| Charge Pump Ground Current, 1× | 0.3 mA typical; gain = 1× |
| VOUT Turn-On Time | 100 µs typical; VDD = 3.6 V, IOUT = 60 mA, measured until VOUT crosses 90% of target value |
| LED Output Leakage Current | 0.1 µA typical, 1 µA maximum; outputs D1 to D9, PWM = 0% |
| Maximum Source Current | 25.5 mA; outputs D1 to D9 |
| Output Current Accuracy | -4% to +4%; output current set to 17.5 mA |
| External Capacitor Requirement | Four ceramic capacitors required; typical application uses CIN = 1 µF, COUT = 1 µF, C1/C2 flying capacitors = 0.47 µF |
| Clock Input | 32 kHz; CLK pin input, connect to ground if not used |
| Interrupt Pin | Open-drain output; INT pin for microcontroller interrupt, leave unconnected if not used |
| Trigger Interface | Input/open-drain I/O; TRIG pin, connect to ground if not used |
| Outputs Powered from VDD | D7, D8, D9; current source outputs 7, 8, and 9 powered from VDD |
| Datasheet Status | request_only |
Product Overview
The LP55231 is a Texas Instruments nine-channel LED driver for controlled LED current sourcing. Outputs D1 to D9 provide nine programmable current source channels, with outputs D7, D8, and D9 powered from VDD. The device includes three independent internal program execution engines, 8-bit LED current setting, and 12-bit LED PWM control, supporting programmable LED output behavior through a two-wire I2C-compatible serial interface.
Power operation is based on an adaptive fractional charge pump with 1× and 1.5× gain modes. The recommended VDD operating range is 2.7 V to 5.5 V, and recommended charge pump load current is 0 mA to 100 mA. The device specifies up to 25.5 mA maximum source current on D1 to D9, output current accuracy of -4% to +4% at 17.5 mA, and LED output leakage of 0.1 µA typical with PWM at 0%.
The package is WQFN-24 with a 4.00 mm × 4.00 mm body. The typical application uses four ceramic capacitors: 1 µF input, 1 µF output, and 0.47 µF C1/C2 flying capacitors. Interface pins include a 32 kHz CLK input, open-drain INT output, and TRIG input/open-drain I/O.
Key Features
- Nine D1 to D9 current source outputs
- Three independent internal program execution engines
- 25.5 mA full-scale programmable LED current
- 8-bit LED current setting resolution
- 12-bit LED PWM control resolution
- Adaptive 1× and 1.5× fractional charge pump
- Up to 94% charge pump efficiency
- Two-wire I2C-compatible serial control interface
- Four pin-selectable I2C addresses via ASEL0 and ASEL1
- WQFN-24 package with 4.00 mm × 4.00 mm body
Typical Applications
- Nine-channel LED current driving
- Programmable LED output sequencing
- I2C-controlled LED indicators
- Low-standby LED driver circuits
- Charge-pump LED drive systems
- PWM-controlled LED brightness control
- Multi-output current source designs
Procurement Notes
When requesting a quote for LP55231, 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 LED and optoelectronic sourcing, brightness bin, wavelength or color temperature bin, forward voltage range, viewing angle, moisture sensitivity level and soldering process limits may affect final selection, availability and lead time.
FAQ
How many LED channels does the LP55231 provide?
The LP55231 provides nine LED current source outputs, identified as D1 through D9. The extracted facts also identify nine programmable outputs controlled with three independent internal program execution engines.
What current and PWM control resolutions are specified?
The LED current setting resolution is 8-bit, and the LED PWM control resolution is 12-bit. The programmable outputs support a full-scale LED current of 25.5 mA.
What supply voltage range is recommended for LP55231?
The recommended VDD operating range is 2.7 V to 5.5 V. Logic input or output pins are specified for operation from 0 V to VDD.
What package is used for this Texas Instruments LED driver?
The LP55231 is specified in a WQFN-24 package with a 4.00 mm × 4.00 mm body. The extracted thermal data is listed for the RTW WQFN 24-pin package.
What interface controls the LP55231?
The device uses a two-wire I2C-compatible serial control interface. It provides four pin-selectable I2C address options using the ASEL0 and ASEL1 address select inputs.
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.