MAX1953

Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers


Please check latest availability status for a specific part variant.

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 high- side 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 (UVLO) 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.
MAX1953, MAX1954, MAX1957: Functional Diagram MAX1953, MAX1954, MAX1957: Functional Diagram Enlarge+

Key Features

  • Low-Cost Current-Mode Controllers
  • Fixed-Frequency PWM
  • MAX1953
    • 1MHz Switching Frequency
    • Small Component Size, Low Cost
    • Adjustable Current Limit
  • MAX1954
    • 3V to 13.2V Input Voltage
    • 25A Output Current Capability
    • 93% Efficiency
    • 300kHz Switching Frequency
  • MAX1957
    • Tracking 0.4V to 0.86VIN Output Voltage Range Sinking and Sourcing Capability of 3A
  • Shutdown Feature
  • All N-Channel MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Internal Digital Soft-Start
  • Thermal Overload Protection
  • Small 10-Pin µMAX Package

Applications/Uses

  • Graphic Cards and Video Cards
  • Low-Voltage Distributed Power
  • Microprocessor Core Supplies
  • PCs and Servers
  • Printers and Scanners
  • Telecommunications and Networking

See parametric specs for Step-Down Switching Regulators (404)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch TypeSynchronous SwitchingOper. Freq.
(kHz)
FeaturesPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1953 35.50.84.510ExternalYes1000
Adjustable Freq.
Current Limit
Fixed Freq./PWM
UMAX/10
$2.33 @1k
MAX1954 13.20.825300
UMAX/10
$2.33 @1k
MAX1957 5.50.43300
UMAX/10
$1.89 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1953EVKIT: Evaluation Kit for the MAX1953/MAX1954
Product Reliability Reports: MAX1953.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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