The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulse-frequency-modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of sup- ply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the break- down voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switch- es, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.
The MAX774/MAX775/MAX776 are inverting switching regulators that provide high efficiency across a wide range of load currents. They utilize a unique current-limited, pulse-frequency-modulated (PFM) control scheme to achieve benefits similar to pulse-width modulation while maintaining low supply current usage.
| Input Voltage Range | 3V to 16.5V |
|---|---|
| Output Voltages | -5V (MAX774), -12V (MAX775), -15V (MAX776) |
| Output Power | Up to 5W |
| Supply Current (Shutdown) | Less than 100uA |
| Switching Frequency | Up to 300kHz |
The MAX774 provides -5V, the MAX775 provides -12V, and the MAX776 provides -15V.
Yes, the output voltage can be user-adjusted with two resistors.