aat1157 Datasheet - Analogictech
The AAT1157 is a high efficiency, synchronous, step-down converter that delivers up to 2A of output current.
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📝 Component Overview
The AAT1157 is a high efficiency, synchronous, step-down converter that delivers up to 2A of output current. It operates from an input voltage range of 2.7V to 5.5V and can produce output voltages as low as 0.6V. The device is designed for high efficiency and low noise, making it suitable for a variety of applications including portable electronics and embedded systems.
Key Features and Benefits
- High efficiency synchronous step-down converter
- Up to 2A output current
- Input voltage range: 2.7V to 5.5V
- Output voltage as low as 0.6V
- Low noise operation
- Small QFN33-16 package
- High switching frequency for smaller external components
Typical Applications
- Portable electronics
- Embedded systems
- Power management for microcontrollers
- Battery-powered devices
- Wireless and handheld devices
- Small form factor power supplies
📊 Complete Technical Specifications
Absolute Maximum Ratings
| Parameter | Value |
|---|---|
| Input Voltage | 5.5V |
| Operating Temperature | -40°C to 85°C |
| Storage Temperature | -40°C to 150°C |
Electrical Characteristics
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Efficiency | V_IN = 3.6V, V_OUT = 1.8V, I_OUT = 1A | 85% | 90% | 92% | % |
| Output Voltage Tolerance | V_IN = 3.6V, I_OUT = 1A | -2% | 0% | 2% | % |
Package Information
- QFN33-16: 16-pin QFN package, 3mm x 3mm
Pin Configuration
- Pin 1: VIN - Input voltage pin
- Pin 2: GND - Ground pin
🔧 Application Guidelines
Design Considerations
When designing with the AAT1157, consider the input and output capacitors for optimal performance. The device requires a minimum input capacitance of 10uF and a minimum output capacitance of 22uF. The output voltage can be adjusted using a resistor divider.
Installation Guidelines
The AAT1157 should be mounted on a PCB with adequate thermal management. The device is sensitive to high temperatures, so ensure that the PCB layout allows for good heat dissipation. The QFN package requires a solder reflow process for attachment.
Operational Notes
The AAT1157 has a built-in soft-start feature to prevent inrush current during startup. The device also has overcurrent protection and thermal shutdown to prevent damage from excessive current or temperature.