DatasheetsPDF.com

MAX8545

Maxim
Part Number MAX8545
Manufacturer Maxim
Description Low-Cost / Wide Input Range / Step-Down Controllers
Published May 2, 2005
Detailed Description 19-2795; Rev 0; 7/03 Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit General Description ...
Datasheet PDF File MAX8545 PDF File

MAX8545
MAX8545

Overview
19-2795; Rev 0; 7/03 Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit General Description The MAX8545/MAX8546/MAX8548 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers ideal for a variety of cost-sensitive applications.
They 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 monitoring 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.
All devices 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 prevents proper operation under power-sag operations to prevent external MOSFETs from overheating.
Internal soft-start is included to reduce inrush current.
These devices are offered in space-saving 10-pin µMAX packages.
o 2.
7V to 28V Input Range o Foldback Short-Circuit Protection o No Additional Bias Supply Needed o 0.
8V to 0.
83 x VIN Output o Up to 95% Efficiency o Low-Cost External Components o No Current-Sense Resistor o All N-Channel MOSFET Design o Adaptive Gate Drivers Eliminate Shoot-Through o Lossless Overcurrent and Short-Circuit Protection o 300kHz Switching Frequency (MAX8545/MAX8546) o 100kHz Switching Frequency (MAX8548)...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)