Overview
The MAX1559 is a comprehensive power-management integrated circuit (IC) designed for low-cost personal digital assistants (PDAs) and other portable devices. It operates from a single-cell lithium-ion (Li+) or three-cell nickel-metal hydride (NiMH) battery. This IC includes all necessary regulators, outputs, and voltage monitors, minimizing the need for external components. It is particularly suited for small PDAs and handheld devices, offering a range of power management features in a compact package.
Key Specifications
| Specification | Value |
|---|---|
| Input Voltage Range | 3.1V to 5.5V |
| MAIN LDO Output | 3.3V, 500mA |
| SD Card Output | 3.3V, 400mA |
| COR1 LDO Output | 1V, 250mA |
| COR2 LDO Output | 1.8V, 30mA |
| Quiescent Current | 50µA |
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 16-pin thin QFN with power pad |
Key Features
- Minimal external components required
- Four linear regulators with PMOS pass elements for low-dropout operation
- High-efficiency LCD boost converter with on-board MOSFET and True Shutdown
- Microprocessor reset output for orderly start-up
- Thermal shutdown protection
- Pin-controlled shutdown for SD and COR2 outputs
- Low-battery shutdown feature
Applications
- Cell Phones/Cordless Phones
- Handheld Devices
- MP3 Players
- Organizers
- PDAs
Q & A
- What is the input voltage range of the MAX1559?
The input voltage range of the MAX1559 is 3.1V to 5.5V.
- What are the main outputs of the MAX1559?
The MAX1559 provides several outputs: a 3.3V, 500mA MAIN LDO; a 3.3V, 400mA SD Card output; a 1V, 250mA COR1 LDO; and a 1.8V, 30mA COR2 LDO.
- What type of package does the MAX1559 come in?
The MAX1559 is packaged in a 16-pin thin QFN with a power pad on the underside.
- What is the quiescent current of the MAX1559?
The quiescent current of the MAX1559 is 50µA.
- Does the MAX1559 have thermal protection?
Yes, the MAX1559 includes thermal shutdown protection to prevent overheating.
- What is the operating temperature range of the MAX1559?
The operating temperature range of the MAX1559 is -40°C to +85°C.
- Does the MAX1559 have a microprocessor reset output?
Yes, the MAX1559 features a microprocessor reset output to ensure an orderly start-up.
- What types of devices is the MAX1559 suitable for?
The MAX1559 is suitable for PDAs, handheld devices, cell phones, cordless phones, MP3 players, and organizers.
- Does the MAX1559 have a low-battery shutdown feature?
Yes, the MAX1559 includes a low-battery shutdown feature.
- How does the LCD boost converter in the MAX1559 operate during shutdown?
The LCD boost converter in the MAX1559 features True Shutdown, disconnecting input power from the inductor during shutdown, causing the boost output to fall to 0V.
