Analog Devices / Maxim Integrated MAX1556/MAX1557 Step-Down DC-DC Converters
Analog Devices MAX1556/MAX1556A/MAX1557 Fixed-Frequency Step-Down DC-DC Converters feature high efficiency, low-quiescent operating current (16µA), low dropout, and minimal (27µA) quiescent current in dropout, making these converters ideal for powering portable devices from 1-cell Li-ion or 3-cell alkaline/NiMH batteries. MAX1556 / MAX1556A Step-Down DC-DC Converters deliver up to 1.2A, have pin-selectable 1.8V, 2.5V, and 3.3V outputs, and are adjustable. The Analog Devices MAX1557 delivers up to 600mA, has pin-selectable 1V, 1.3V, and 1.5V outputs, and is adjustable.
MAX1556/MAX1556A/MAX1557 DC-DC Converters contain a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and dropout performance while minimizing external component count. These Analog Devices devices are ideal for PDAs, palmtop computers, cell phones and smartphones, digital cameras, camcorders, and more.
Features
- Up to 97% efficiency
- 95% Efficiency at 1mA load current
- Low 16μA quiescent current
- 1MHz PWM switching
- Tiny 3.3μH inductor
- Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V, and adjustable output
- 1.2A Guaranteed output current (MAX1556/MAX1556A)
- 600mA Guaranteed output current (MAX1557)
- Voltage positioning optimizes load-transient response
- Low 27μA quiescent current in dropout
- Low 0.1μA shutdown current
- No external Schottky diode required
- Analog soft-start with zero overshoot current
- Small, 10-Pin, 3mm x 3mm TDFN package
Applications
- PDAs and palmtop computers
- Cell phones and smartphones
- Digital cameras and camcorders
- Portable MP3 and DVD players
- Hand-held instruments
Typical Operating Circuit
公開: 2012-01-17
| 更新済み: 2023-04-13