General Description

The MAX77505 is a low-quiescent current (800nA typ),

high-efficiency hysteretic buck converter operating from

a 2.5V to 16V input voltage range. The device offers high

efficiency over the entire load range. Hence, it is ideal

for either a primary battery or four alkaline batterypowered

applications, which require long standby/idling

time with short working time, such as asset tracking and

door-lock devices.

A resistor (RSEL) selects one of thirty preset output

voltages between 0.8V and 5.5V. The device has input

undervoltage lockout, cycle-by-cycle switch current limit,

and thermal shutdown to protect the system and the

device itself. The device is available in a 10-lead

FC2QFN package (2.0mm x 2.0mm x 0.55mm).

Applications

• 2-3 Cell Li+ Battery Applications

• 4-Cell Alkaline Battery Applications

• IoT, Wearable Devices

• Smart Meter, Door Locks, Asset Trackers, etc.

Benefits and Features

• Input Voltage: 2.5V to 16V

• Output Voltage: 0.8V to 5.5V

• Long Battery Life

• 70nA Shutdown Current

• 800nA Ultra-Low Quiescent Current (IQ)

• 86 Efficiency at 100μA Load at 7.6VIN, 3.3VOUT

• 95 Peak Efficiency at 7.6VIN, 3.3VOUT

• POKB Output (Open-Drain)

• SEL Pin for Output Voltage Selection

• Protections Features

• Cycle-by-Cycle Inductor Peak Current Limit

• Short Circuit, Undervoltage Lockout (UVLO), and

Thermal Protection

• FC2QFN-10 Package (2.0mm x 2.0mm x 0.55mm)