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MAX1953 Dataheets PDF



Part Number MAX1953
Manufacturers Maxim
Logo Maxim
Description Low-Cost / High-Frequency / Current-Mode PWM Buck Controller
Datasheet MAX1953 DatasheetMAX1953 Datasheet (PDF)

19-2373; Rev 0; 4/02 Low-Cost, High-Frequency, Current-Mode PWM Buck Controller General Description The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are targeted for applications where cost and size are critical. The MAX1953 operates at a fixed 1MHz switching frequency, thus significantly reducing external component size and cost. Additionally, excellent transient response is ob.

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19-2373; Rev 0; 4/02 Low-Cost, High-Frequency, Current-Mode PWM Buck Controller General Description The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are targeted for applications where cost and size are critical. The MAX1953 operates at a fixed 1MHz switching frequency, thus significantly reducing external component size and cost. Additionally, excellent transient response is obtained using less output capacitance. The MAX1953 operates from low 3V to 5.5V input voltage and can supply up to 10A of output current. Selectable current limit is provided to tailor to the external MOSFETs’ on-resistance for optimum cost and performance. The output voltage is adjustable from 0.8V to 0.86VIN. With the MAX1954, the drain-voltage range on the highside FET is 3V to 13.2V and is independent of the supply voltage. It operates at a fixed 300kHz switching frequency and can be used to provide up to 25A of output current with high efficiency. The output voltage is adjustable from 0.8V to 0.86VHSD. The MAX1957 features a tracking output voltage range of 0.4V to 0.86VIN and is capable of sourcing or sinking current for applications such as DDR bus termination and PowerPC™/ASIC/DSP core supplies. The MAX1957 operates from a 3V to 5.5V input voltage and at a fixed 300kHz switching frequency. The MAX1953/MAX1954/MAX1957 provide a COMP pin that can be pulled low to shut down the converter in addition to providing compensation to the error amplifier. An input undervoltage lockout (ULVO) is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current. The MAX1953/MAX1954/MAX1957 are available in tiny 10-pin µMAX packages. o Low-Cost Current-Mode Controllers o Fixed-Frequency PWM o MAX1953 1MHz Switching Frequency Small Component Size, Low Cost Adjustable Current Limit o MAX1954 3V to 13.2V Input Voltage 25A Output Current Capability 93% Efficiency 300kHz Switching Frequency o MAX1957 Tracking 0.4V to 0.86VIN Output Voltage Range Sinking and Sourcing Capability of 3A o Shutdown Feature o All N-Channel MOSFET Design for Low Cost o No Current-Sense Resistor Needed o Internal Digital† Soft-Start o Thermal Overload Protection o Small 10-Pin µMAX Package Features MAX1953/MAX1954/MAX1957 Ordering Information PART MAX1953EUB MAX1954EUB MAX1957EUB TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 10 µMAX 10 µMAX 10 µMAX Pin Configurations TOP VIEW Applications Printers and Scanners Graphic Cards and Video Cards PCs and Servers Microprocessor Core Supply Low-Voltage Distributed Power Telecommunications and Networking ILIM 1 COMP FB GND IN 2 3 4 5 10 BST 9 LX DH PGND DL MAX1953EUB 8 7 6 µMAX †Patent Pending PowerPC is a trademark of Motorola, Inc. Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Low-Cost, High-Frequency, Current-Mode PWM Buck Controller MAX1953/MAX1954/MAX1957 ABSOLUTE MAXIMUM RATINGS IN, FB to GND...........................................................-0.3V to +6V LX to BST..................................................................-6V to +0.3V BST to GND ............................................................-0.3V to +20V DH to LX ....................................................-0.3V to (VBST + 0.3V) DL, COMP to GND.......................................-0.3V to (VIN + 0.3V) HSD, ILIM, REFIN to GND ........................................-0.3V to 14V PGND to GND .......................................................-0.3V to +0.3V IDH, IDL ................................................................±100mA (RMS) Continuous Power Dissipation (TA = +70°C) (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. ELECTRICAL CHARACTERISTICS (VIN = 5V, VBST - VLX = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Operating Input Voltage Range HSD Voltage.


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