Overview
The LM26484SQ/NOPB is a multi-function, configurable Power Management Unit (PMU) produced by Texas Instruments. This device integrates two highly efficient 2.0A Step-Down DC/DC converters, one Low Dropout (LDO) controller, a Power On Reset (POR) circuit, and thermal overload protection circuitry. All regulator output voltages are externally adjustable, making it highly versatile for various applications. The LM26484 is offered in a 5 x 4 x 0.8 mm WQFN-24 pin package, suitable for space-constrained designs.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| VIN Range | 3.0 | 3.3 | 5.5 | V |
| Feedback Voltage Accuracy | -1.0 | 0.5 | +1.0 | % |
| DC Line Regulation | 0.174 | %/V | ||
| DC Load Regulation | 0.75 | %/A | ||
| Oscillator Frequency | 1.8 | 2.0 | MHz | |
| Peak Switching Current Limit | 3.2 | A | ||
| Operating Temperature Range | -40 | 125 | °C |
Key Features
- Step-Down DC/DC Converter (Buck) with 3.0–5.5V input range and externally adjustable VOUT (0.8V–3.5V @ 2A)
- 180° phase shift between bucks clocks
- 2 MHz PWM switching frequency
- ±1% feedback voltage accuracy
- Automatic soft start and current overload protection
- PWM/PFM efficiency modes available
- Linear Regulator (LDO) controller with 3.0V–5.5V input range and externally adjustable VOUT
- Regulated to Low VIN - Low VOUT LI-LO (Low Input Low Output) NFET operation
- Up to 1000 mA output current by selection of external FET
- Power-On Reset (POR) circuit and thermal overload protection
Applications
- Digital Cores and I/Os (FPGAs, ASICs, DSPs)
- Automotive Infotainment
- Set-Top-Box
- Cordless Phone Base Station
- Networking Router
- Printers
Q & A
- What is the input voltage range of the LM26484?
The input voltage range of the LM26484 is 3.0V to 5.5V.
- What is the maximum output current of each buck converter?
Each buck converter can deliver up to 2A of output current.
- What is the switching frequency of the buck converters?
The switching frequency of the buck converters is 2 MHz.
- Does the LM26484 have a Power-On Reset (POR) feature?
- What type of capacitors are recommended for the LDO output?
Ceramic capacitors with specific ESR values are recommended for the LDO output.
- Can the LM26484 operate in low dropout mode?
- What is the phase shift between the two buck converters?
The two buck converters have a 180° phase shift between their clocks.
- How is the output voltage of the LDO controller adjusted?
The output voltage of the LDO controller is adjusted using external feedback resistors.
- What is the operating temperature range of the LM26484?
The operating temperature range is -40°C to 125°C.
- Does the LM26484 have thermal overload protection?
