MAX8545

ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.)
VIN to GND ............................................................-0.3V to +30V
Vcc to GND .............................-0.3V, lower of 6V or (VL + 0.3V)
FB to GND ................................................................-0.3V to +6V
BST to GND............................................................-0.3V to +36V
VL, DL, COMP to GND .................................-0.3V to (VCC + 0.3V)
BST to LX..................................................................-0.3V to +6V
DH to LX....................................................-0.3V to (VBST + 0.3V)
VL Short to GND ......................................................................5s
LX to GND ......................................................................0 to 30V
Input Current (any pin) ....................................................±50mA
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ..............444mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The MAX8545/MAX8546/MAX8548 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers ideal for a variety of cost-sensitive  pplications. MAX8545 drive low-cost N-channel MOSFETs for both the high-side switch and synchronous rectifier, and require no external current-sense resistor. These devices can supply output voltages as low as 0.8V.

The MAX8545/MAX8546/MAX8548 have a wide 2.7V to 28V input range, and do not need any additional bias voltage. The output voltage can be precisely regulated from 0.8V to 0.83 x VIN. These devices can provide efficiency up to 95%. Lossless short-circuit and current-limit protection is provided by   onitoring the RDS(ON) of the low-side MOSFET. The MAX8545 and MAX8548 have a current-limit threshold of 320mV, while the MAX8546 has a current-limit threshold of 165mV. MAX8545 feature foldback-current capability to minimize power dissipation under short-circuit condition. Pulling the COMP/EN pin low with an open-collector or low-capacitance, opendrain device can shut down all devices.

The MAX8545/MAX8546 operate at 300kHz and the MAX8548 operates at 100kHz. The MAX8545/ MAX8546/MAX8548 are compatible with low-cost aluminum
electrolytic capacitors. Input undervoltage lockout of MAX8545 prevents proper operation under power-sag operations to prevent external MOSFETs from overheating.
 nternal soft-start is included to reduce inrush current. These devices are offered in space-saving 10-pin µMAX packages.