Specifications
| Type | Description |
|---|---|
| Part Number | LP8557 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Component Type | Power_IC |
| Package / Case | DSBGA (YFQ), 16 pins, 1.906 mm x 1.64 mm max body size |
| LED Current Sink Count | 6; integrated high-precision LED current sinks |
| LED Current Sink Rating | 25 mA each across six LED current sinks |
| Input Voltage Range | 2.7-5.5 V VDD range for single-cell Li-ion applications |
| Boost Output Voltage Operating Range | 7-28 V |
| Integrated Switch Voltage Capability | 28 V integrated DC-DC boost converter power MOSFET |
| Brightness Control Interface | PWM input duty cycle for LP8557 PWM-only option |
| Configuration Interface | Resistors or I2C interface for switching frequency, PWM output frequency, and LED current setting |
| PWM Dimming Method | Hybrid PWM plus current dimming for higher LED drive optical efficiency |
| LED String Auto-Detect Range | 1-6 LED strings |
| Package Option | DSBGA (16) |
| Package Body Size | 1.906 mm x 1.64 mm max |
| Orderable Device Option | LP8557AYFQT / LP8557AYFQR; PWM-only option for systems without I2C master |
| Orderable Device Option | LP8557IAYFQT / LP8557IAYFQR; PWM and I2C option for systems with I2C master |
| Package Top Mark | D40 for LP8557AYFQT / LP8557AYFQR |
| Package Top Mark | D41 for LP8557IAYFQT / LP8557IAYFQR |
| Package Quantity | 250 or 3000 for YFQ DSBGA package orderable options |
| VDD Absolute Maximum Voltage | -0.3 to 6 V on VDD pin over operating free-air temperature |
| Digital IO Absolute Maximum Voltage | -0.3 to 6 V on digital IO pins |
| SW/FB/LED Pin Absolute Maximum Voltage | -0.3 to 31 V on SW, FB, LED1 to LED6 pins |
| Junction Temperature Absolute Maximum | -30 to 125 °C |
| Maximum Lead Temperature | 260 °C for soldering |
| Storage Temperature Range | -65 to 150 °C |
| ESD HBM Rating | ±2000 V per ANSI/ESDA/JEDEC JS-001 |
| ESD CDM Rating | ±500 V per JEDEC JESD22-C101 |
| Recommended VDD Operating Voltage | 2.7-5.5 V |
| Recommended SW/FB/LED Pin Voltage | 0-28 V on SW, FB, LED1 to LED6 |
| Ambient Operating Temperature | -30 to 85 °C |
| Junction Operating Temperature | -30 to 125 °C |
| Junction-to-Ambient Thermal Resistance | 75.7 °C/W for YFQ DSBGA, 16 pins |
| Junction-to-Case Top Thermal Resistance | 0.5 °C/W for YFQ DSBGA, 16 pins |
| Junction-to-Board Thermal Resistance | 16.2 °C/W for YFQ DSBGA, 16 pins |
| Junction-to-Top Characterization Parameter | 0.2 °C/W for YFQ DSBGA, 16 pins |
| Junction-to-Board Characterization Parameter | 16.2 °C/W for YFQ DSBGA, 16 pins |
| Standby Current | 1 µA at TA=25°C, VDD=3.8 V |
| Operating Current | 2.2 mA at TA=25°C, VDD=3.8 V, no LED current |
| Internal Oscillator Frequency Accuracy | ±4% at TA=25°C, VDD=3.8 V |
| Internal Oscillator Frequency Accuracy | ±7% over -30°C ≤ TA ≤ 85°C |
| Thermal Shutdown Threshold | 150 °C; verified by design, not tested in production |
| Thermal Shutdown Hysteresis | 20 °C; verified by design, not tested in production |
| Switch ON Resistance | 0.2 Ω at ISW=0.5 A, TA=25°C, VDD=3.8 V |
| Minimum Boost Output Voltage | 6 V min, 7 V typ, 8 V max over -30°C ≤ TA ≤ 85°C |
| Maximum Boost Output Voltage | 27 V min, 28 V typ, 29 V max over -30°C ≤ TA ≤ 85°C |
| SW Pin Current Limit | 2.1 A min, 2.4 A typ, 2.5 A max at TA=25°C, VDD=3.8 V |
| Maximum Continuous Load Current | 160 mA at ISW_LIM=2.4 A, VIN=3 V, VOUT=24 V; verified by design |
| Switching Frequency | 500 kHz or 1000 kHz at TA=25°C, VDD=3.8 V |
| Overvoltage Protection Threshold | VBOOST_MAX + 1.6 V |
| UVLO Threshold | 2.5 V at TA=25°C, VDD=3.8 V |
| UVLO Hysteresis | 50 mV at TA=25°C, VDD=3.8 V |
| Switch Pulse Minimum Width | 80 ns at no load; verified by design, not tested in production |
| Boost Startup Time | 1 ms; verified by design, not tested in production |
| Datasheet Status | request_only |
Product Overview
The LP8557 is a Texas Instruments LED backlight boost driver for Power_Management designs that need a compact boost converter and multiple matched LED current sinks. It integrates six high-precision LED current sinks rated at 25 mA each, with automatic detection across 1-6 LED strings for layout and string-count flexibility.
The device supports a 2.7-5.5 V recommended VDD operating range, matching single-cell Li-ion applications, and a 7-28 V boost output operating range. Its integrated DC-DC boost converter includes a 28 V-capable power MOSFET, 2.1 A minimum to 2.5 A maximum SW current limit at the specified test condition, and selectable 500 kHz or 1000 kHz switching frequency.
Brightness control is based on PWM input duty cycle. Configuration of switching frequency, PWM output frequency, and LED current setting can be handled with resistors or an I2C interface, depending on the orderable option. The YFQ DSBGA package has 16 pins, a maximum body size of 1.906 mm x 1.64 mm, and a soldering lead temperature rating of 260 °C.
Key Features
- Six integrated high-precision LED current sinks
- 25 mA rating for each LED current sink
- 2.7-5.5 V VDD input operating range
- 7-28 V boost output operating range
- 28 V-capable integrated boost switch MOSFET
- PWM input duty-cycle brightness control
- Resistor or I2C configuration interface options
- Hybrid PWM plus current dimming method
- Automatic detection for 1-6 LED strings
- Selectable 500 kHz or 1000 kHz switching
Typical Applications
- LED backlight boost circuits
- Single-cell Li-ion backlight systems
- PWM-only brightness control designs
- I2C-configured backlight designs
- One to six LED-string modules
- Compact DSBGA power-management layouts
Procurement Notes
When requesting a quote for LP8557, 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 LP8557?
The LP8557 is a Texas Instruments LED backlight boost driver in the Power_Management category. It integrates a boost converter and six high-precision LED current sinks rated at 25 mA each.
What input and boost voltage ranges does LP8557 support?
The recommended VDD operating range is 2.7-5.5 V. The simplified operating boost output range is 7-28 V, with electrical characteristics listing a 7 V typical minimum boost output voltage and 28 V typical maximum boost output voltage.
How is brightness controlled on the LP8557?
Brightness control uses PWM input duty cycle. The datasheet facts also specify a hybrid PWM plus current dimming method, intended for higher LED drive optical efficiency.
Which LP8557 orderable options support I2C configuration?
LP8557IAYFQT and LP8557IAYFQR are the PWM and I2C options and are recommended for systems with an I2C master. LP8557AYFQT and LP8557AYFQR are PWM-only options for systems without an I2C master.
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.