Specifications
| Type | Description |
|---|---|
| Part Number | LP3954 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | DSBGA, 3.0 x 3.0 x 0.6 mm or 3.0 x 3.0 x 0.65 mm, 0.5 mm pitch, package number YZR0036AAA or YPG0036AAA |
| Function | Advanced lighting management unit for handheld device lighting; drives display backlights, RGB LEDs, keypad LEDs, camera flash LEDs, and motor/vibra loads |
| White LED Driver Count | 4+2 or 6 low-voltage constant-current white LED drivers; programmable 8-bit current adjustment |
| White LED Current Range | 0 to 25 mA per LED on WLED1-WLED6 backlight outputs |
| RGB LED Driver Current | Up to 40 mA per LED on RGB1 and RGB2 outputs |
| Flash Driver Current | Up to 300 mA on FLASH output typical application |
| Boost Converter Output Voltage | 4 to 5.3 V in typical application and block diagram |
| Boost Converter Diode Current Rating | 300 to 400 mA for typical application external diode D1 IMAX |
| Recommended Inductor | 4.7 µH for boost converter external inductor L1 |
| Recommended Output Capacitor | 10 µF for boost converter COUT |
| Recommended Input Capacitor | 10 µF for boost converter CIN |
| Recommended VDD Bypass Capacitor | 100 nF CVDD on VDD1/VDD2 supply |
| Recommended VDDA Capacitor | 1 µF CVDDA for analog LDO output |
| Recommended VREF Capacitor | 100 nF CREF on VREF output |
| Recommended VDDIO Capacitor | 100 nF CVDDIO on VDDIO supply |
| Interface | SPI/I2C compatible; IF_SEL=1 selects SPI |
| Absolute Maximum Voltage on SW/FB/LED Outputs | -0.3 to +7.2 V on SW, FB, R1-2, G1-2, B1-2, FLASH, WLED1-6 pins |
| Absolute Maximum Supply Voltage | -0.3 to +6.0 V on VDD1, VDD2, VDD_IO, VDDA |
| Absolute Maximum Analog Pin Voltage | -0.3 V to VDD1 + 0.3 V, 6.0 V max on ASE, IRT, IFLASH, IRGB, VREF pins |
| Absolute Maximum Logic Pin Voltage | -0.3 V to VDD_IO + 0.3 V, 6.0 V max on logic pins |
| Absolute Maximum VREF Current | 10 µA for I(VREF) |
| Absolute Maximum RGB Output Current | 100 mA for I(R1, G1, B1, R2, G2, B2) |
| Absolute Maximum FLASH Current | 400 mA for I(FLASH) |
| Maximum Junction Temperature | 150 °C TJ-MAX absolute maximum rating |
| Storage Temperature Range | -65 to +150 °C absolute maximum rating |
| Maximum Lead Temperature | 260 °C for soldering |
| ESD Rating | 2 kV Human Body Model |
| Operating Output Pin Voltage | 0 to 6.0 V on SW, FB, WLED1-6, R1-2, G1-2, B1-2, FLASH |
| Operating Supply Voltage with External LDO | 2.7 to 5.5 V on VDD1, VDD2 |
| Operating Supply Voltage with Internal LDO | 3.0 to 5.5 V on VDD1, VDD2 |
| VDDA Operating Voltage | 2.7 to 2.9 V operating rating |
| VDDIO Operating Voltage | 1.65 V to VDD1 operating rating |
| ASE Input Voltage Range | 0.1 V to VDDA - 0.1 V operating rating |
| Recommended Load Current | 0 to 300 mA operating rating |
| Operating Junction Temperature Range | -30 to +125 °C TJ operating rating |
| Operating Ambient Temperature Range | -30 to +85 °C TA operating rating |
| Junction-to-Ambient Thermal Resistance | 60 °C/W for YZR0036AAA or YPG0036AAA package |
| Standby Supply Current | 1 µA typ, 8 µA max on VDD1/VDD2, NSTBY=L, SCK/SS/SI condition listed |
| No-Boost Supply Current | 400 µA typ on VDD1/VDD2, NSTBY=H, EN_BOOST=L, audio sync and LEDs off |
| No-Load Supply Current | 1 mA typ on VDD1/VDD2, NSTBY=H, EN_BOOST=H, audio sync and LEDs off, autoload off |
| RGB Driver Supply Current | 150 µA typ in CC mode at R1/G1/B1 and R2/G2/B2 set to 15 mA |
| RGB Driver Supply Current in Switch Mode | 150 µA typ in SW mode |
| WLED Driver Supply Current | 500 µA typ with 4+2 banks and IOUT per LED = 25 mA |
| Audio Synchronization Supply Current | 390 µA typ with audio sync ON and VDD1/VDD2 = 2.8 V |
| Audio Synchronization Supply Current | 700 µA typ with audio sync ON and VDD1/VDD2 = 3.6 V |
| Flash Supply Current | 2 mA typ with I(RFLASH)=1 mA, peak current during flash |
| VDDIO Standby Supply Current | 1 µA typ with NSTBY=L, SCK/SS/SI=H |
| VDDIO Supply Current | 20 µA typ at 1 MHz SCK frequency in SPI mode, CL=50 pF at SO pin |
| External LDO Output Current | 6.5 mA typ for 7 V tolerant application only, IBOOST=300 mA |
| Internal LDO Output Voltage | 2.72 V min, 2.80 V typ, 2.88 V max for VDDA analog parts output |
| Internal LDO Output Voltage Accuracy | -3% min, +3% max for VDDA analog parts output |
| Reset Register Address | 60h; writing any data resets LP3954 |
| Power-On Reset Threshold | 1.5 V; POR activates below 1.5 V and inactivates above 1.5 V on VDD2 |
| Startup Delay | 10 ms internal startup sequence oscillator initialization delay |
| Boost Startup Delay | 10 ms boost soft-start period; LED outputs switched off during startup |
| Thermal Shutdown Engage Temperature | 160 °C typ internal thermal shutdown |
| Thermal Shutdown Disengage Temperature | 140 °C typ internal thermal shutdown |
| Boost Switching Frequency Options | 1 MHz, 1.67 MHz, 2 MHz default with RT = 82 kohm timing resistor |
| Boost Input Source Voltage | 3.0 to 4.5 V single Li-Ion battery input for boost converter |
| Boost Output Voltage Programming | 8-bit register, 9 steps for boost converter output voltage control |
| Minimum Boost Headroom to Avoid Pulse Skipping | 0.5 V; output voltage should be at least 0.5 V higher than input voltage |
| Datasheet Status | request_only |
Product Overview
The LP3954 is a Texas Instruments advanced lighting management unit for handheld device lighting in the Power_Management category. It integrates control for display backlights, RGB indicator LEDs, keypad LEDs, camera flash LEDs, and motor/vibra loads, with a SPI/I2C-compatible interface selected for SPI when IF_SEL is set high.
The white LED section provides 4+2 or 6 low-voltage constant-current outputs with programmable 8-bit current adjustment. WLED1 through WLED6 support 0 to 25 mA per LED, while RGB1 and RGB2 outputs support up to 40 mA per LED. The flash output supports up to 300 mA in the typical application.
The boost converter provides a programmable 4 to 5.3 V output from a 3.0 to 4.5 V single Li-Ion input, with 1 MHz, 1.67 MHz, and 2 MHz default switching-frequency options using an 82 kohm timing resistor. The typical external network uses a 4.7 µH inductor, 10 µF input and output capacitors, and a 300 to 400 mA diode. The package is a 36-ball DSBGA, 3.0 x 3.0 mm, 0.5 mm pitch.
Key Features
- 4+2 or 6 constant-current white LED drivers
- 0 to 25 mA per WLED output
- RGB outputs support up to 40 mA per LED
- FLASH output supports up to 300 mA
- Programmable 4 to 5.3 V boost output
- SPI/I2C-compatible control interface
- 1 MHz, 1.67 MHz, and 2 MHz switching options
- 10 ms startup and boost soft-start delays
- Internal LDO provides 2.80 V typical VDDA
- Thermal shutdown engages at 160 °C typical
Typical Applications
- Display backlight control
- RGB LED lighting
- Keypad LED lighting
- Camera flash LED drive
- Motor and vibra loads
- Handheld device lighting
Procurement Notes
When requesting a quote for LP3954, 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 LP3954?
The LP3954 is an advanced lighting management unit from Texas Instruments for handheld device lighting. It drives display backlights, RGB LEDs, keypad LEDs, camera flash LEDs, and motor or vibra loads.
How many white LED drivers does LP3954 provide?
The LP3954 provides 4+2 or 6 low-voltage constant-current white LED drivers. The WLED1 through WLED6 backlight outputs support programmable 8-bit current adjustment from 0 to 25 mA per LED.
What interface does the LP3954 support?
The LP3954 uses a SPI/I2C-compatible interface. The extracted datasheet facts specify that setting IF_SEL to 1 selects SPI operation.
What package is used for the LP3954?
The LP3954 is listed in a 36-ball DSBGA package with 0.5 mm pitch. Package dimensions are 3.0 x 3.0 x 0.6 mm or 3.0 x 3.0 x 0.65 mm, with package numbers YZR0036AAA or YPG0036AAA.
What are the LP3954 boost converter component values?
The typical boost converter application uses a 4.7 µH external inductor, 10 µF input capacitor, 10 µF output capacitor, and an external diode rated for 300 to 400 mA.
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.