Purchase MAX8545, In-stock MAX8545 From SeekIC.
Part Number: MAX8545
Description: The MAX8545/MAX8546/MAX8548 are voltage-mode pulse-width-modulated (PWM), step-down DC-DC controllers ...
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MAX8545
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DataSheet
General Description
MAX8545 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 pplications. 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 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. 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.
nternal soft-start is included to reduce inrush current. These devices are offered in space-saving 10-pin µMAX packages.
MAX8545 Maximum Ratings
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.
MAX8545 Features
2.7V to 28V Input Range
Foldback Short-Circuit Protection
No Additional Bias Supply Needed
0.8V to 0.83 x VIN Output
Up to 95% Efficiency
Low-Cost External Components
No Current-Sense Resistor
All N-Channel MOSFET Design
Adaptive Gate Drivers Eliminate Shoot-Through
Lossless Overcurrent and Short-Circuit Protection
300kHz Switching Frequency (MAX8545/MAX8546)
100kHz Switching Frequency (MAX8548)
Pin-Compatible with the MAX1967
Thermal Shutdown
Foldback Short-Circuit Protection
No Additional Bias Supply Needed
0.8V to 0.83 x VIN Output
Up to 95% Efficiency
Low-Cost External Components
No Current-Sense Resistor
All N-Channel MOSFET Design
Adaptive Gate Drivers Eliminate Shoot-Through
Lossless Overcurrent and Short-Circuit Protection
300kHz Switching Frequency (MAX8545/MAX8546)
100kHz Switching Frequency (MAX8548)
Pin-Compatible with the MAX1967
Thermal Shutdown
MAX8545 Typical Application
Set-Top Boxes
Graphic Card and Video
Supplies
Desktops and Desknotes
PCI Express Power
Supplies
Telecom Power Supplies
Notebook Docking
Station Supplies
Cable Modems and
Routers
Networking Power
Supplies
Graphic Card and Video
Supplies
Desktops and Desknotes
PCI Express Power
Supplies
Telecom Power Supplies
Notebook Docking
Station Supplies
Cable Modems and
Routers
Networking Power
Supplies
MAX8545 Connection Diagram
MAX8545
PDF/DataSheet Download
- Datasheet: MAX8545
- File Size: 352148 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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