Specifications
| Type | Description |
|---|---|
| Part Number | LP8555 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | DSBGA-36, 2.478 mm x 2.478 mm |
| Component Type | Power_IC |
| Input Supply Voltage Range | 2.7-20 V; VDD recommended operating condition |
| Digital I/O Supply Voltage Range | 1.7-5.5 V; EN/VDDIO recommended operating condition |
| Logic Terminal Voltage Range | 0-5.5 V; PWM/INT, FSET/SDA, ISET/SCL recommended operating condition |
| Analog Terminal Voltage Range | 0-28 V; SW_A, SW_B, LEDxy, FB_x recommended operating condition |
| Maximum LED Current Sink Count | 12; LEDA1-LEDA6 and LEDB1-LEDB6 current sinks |
| Maximum Sink Current | 50 mA; LEDA1-B6 current sink outputs |
| Output Current Accuracy | -4% to +4%; output current set to 23 mA |
| Current Sink Matching | 1% typ, 5% max; current scale set to 23 mA, PWM = 100% |
| LED Switching Frequency | 4.9 kHz; PFREQ = 000b |
| LED Switching Frequency | 39.1 kHz; PFREQ = 111b |
| Current Sink Leakage Current | 1 uA max; outputs LEDA1-LEDB6, VLEDxx = 28 V |
| Current Sink Saturation Voltage | 200 mV typ, 260 mV max; output current set to 23 mA |
| Current Sink Saturation Voltage | 250 mV typ, 340 mV max; output current set to 30 mA |
| Boost Converter Count | 2; integrated dual DC-DC boost converters |
| Minimum Boost Output Voltage | 7 V; applies for both boost converters |
| Maximum Boost Output Voltage | 18 V; VMAX = 00 |
| Maximum Boost Output Voltage | 22 V; VMAX = 01 |
| Maximum Boost Output Voltage | 25 V; VMAX = 10 |
| Maximum Boost Output Voltage | 28 V; VMAX = 11 |
| Boost Switching Frequency | 500 kHz; BFREQ = 0 |
| Boost Switching Frequency | 1000 kHz; BFREQ = 1 |
| Boost Oscillator Accuracy | -7% to +7%; applies for boost converters |
| Internal Oscillator Frequency Accuracy | -7% to +7%; electrical characteristics |
| SW FET Current Limit | 2.7 A min, 3.1 A typ, 3.5 A max; applies for both boost converters |
| NMOS Switch On Resistance | 0.16 ohm typ; ISW = 0.5 A |
| Continuous Load Current | 180 mA; VBATT = 3 V, VOUT = 26.6 V, typical application |
| Output/Input Conversion Ratio | 1.3-10; no load, BFREQ = 1 |
| Overvoltage Protection Threshold | VBST_MAX + 1.6 V; boost converter OVP threshold |
| SW Node Slew Rate | 12.5 V/ns; OFF-to-ON transition, load current 120 mA, SRON = 00b |
| SW Node Slew Rate | 19.5 V/ns; ON-to-OFF transition, load current 120 mA, SRON = 00b |
| PWM Input Frequency | 75-50000 Hz; PWM interface characteristics |
| Minimum PWM Pulse On Time | 100 ns; PWM interface characteristics |
| Minimum PWM Pulse Off Time | 100 ns; PWM interface characteristics |
| Startup Time | 5 ms typ, 7 ms max; measured from ON bit set high to backlight enabled |
| Shutdown Supply Current | 1 uA max; EN = L and PWM/INT = L |
| Standby Supply Current | 19 uA typ, 30 uA max; EN = H, PWM/INT = L, ON bit = 0 |
| Normal Mode Supply Current | 4.2 mA typ; EN = H, ON bit = 1, no current through LED outputs |
| Thermal Shutdown Threshold | 150 °C typ; electrical characteristics |
| Thermal Shutdown Hysteresis | 13 °C typ; electrical characteristics |
| Operating Ambient Temperature Range | -40 to 85 °C; absolute maximum ratings |
| Maximum Operating Junction Temperature | -40 to 125 °C; absolute maximum ratings |
| Junction-to-Ambient Thermal Resistance | 76.2 °C/W; DSBGA-36 package |
| Datasheet Status | request_only |
Product Overview
The LP8555 is a Texas Instruments Power_Management LED backlight driver with integrated dual DC-DC boost converters and 12 current sink outputs across LEDA1-LEDA6 and LEDB1-LEDB6. Its recommended VDD operating range is 2.7-20 V, with a separate EN/VDDIO range of 1.7-5.5 V and logic terminals specified from 0-5.5 V for PWM/INT, FSET/SDA, and ISET/SCL.
For LED drive, each sink output supports up to 50 mA. At a 23 mA setting, output current accuracy is specified from -4% to +4%, with 1% typical and 5% maximum current sink matching at PWM = 100%. Saturation voltage is specified at 200 mV typical and 260 mV maximum at 23 mA, or 250 mV typical and 340 mV maximum at 30 mA.
The boost section provides two converters with a 7 V minimum boost output voltage and selectable maximum boost output settings of 18 V, 22 V, 25 V, or 28 V. The part is supplied in a DSBGA-36 package measuring 2.478 mm x 2.478 mm, with 76.2 °C/W junction-to-ambient thermal resistance and operation characterized across -40 to 85 °C ambient conditions.
Key Features
- 2.7-20 V recommended VDD input supply range
- 1.7-5.5 V EN/VDDIO digital supply range
- Twelve LED current sinks for backlight strings
- Up to 50 mA per LED current sink
- Dual integrated DC-DC boost converters
- Selectable 18 V, 22 V, 25 V, or 28 V boost limit
- 500 kHz or 1000 kHz boost switching frequency
- 75-50000 Hz PWM input frequency range
- 5 ms typical startup to backlight enabled
- 1 uA maximum shutdown supply current
- 150 °C typical thermal shutdown threshold
- DSBGA-36 package, 2.478 mm x 2.478 mm
Typical Applications
- LED backlight driver circuits
- Dual-boost LED backlight systems
- PWM-controlled backlight dimming
- Multi-string LED current sink designs
- Battery-input display backlights
- Compact DSBGA-36 power assemblies
Procurement Notes
When requesting a quote for LP8555, 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 input supply range is specified for the LP8555?
The LP8555 VDD recommended operating condition is 2.7-20 V. Its EN/VDDIO digital I/O supply range is 1.7-5.5 V, while the PWM/INT, FSET/SDA, and ISET/SCL logic terminals are specified from 0-5.5 V.
How many LED current sinks does the LP8555 provide?
The LP8555 provides 12 LED current sinks, covering LEDA1 through LEDA6 and LEDB1 through LEDB6. Each LED current sink output supports up to 50 mA, with output current accuracy specified at -4% to +4% when set to 23 mA.
What boost converter capability is included in the LP8555?
The LP8555 includes two integrated DC-DC boost converters. The minimum boost output voltage is 7 V, and selectable maximum boost output settings are 18 V, 22 V, 25 V, and 28 V depending on the VMAX setting.
What package is used for the LP8555?
The LP8555 is specified in a DSBGA-36 package measuring 2.478 mm x 2.478 mm. For this package, the junction-to-ambient thermal resistance is listed as 76.2 °C/W.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 25, 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.