MAX1993

Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages

Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages


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Description

The MAX1992/MAX1993 pulse-width modulation (PWM) controllers provide high-efficiency, excellent transient response, and high DC output accuracy. The devices step down high-voltage batteries to generate low-voltage CPU core or chipset/RAM supplies in notebook computers.

Maxim's proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients, while maintaining a relatively constant switching frequency. Efficiency is enhanced by the ability to drive very large synchronous-rectifier MOSFETs. Current sensing to ensure reliable overload and inductor saturation protection is available using an external current-sense resistor in series with the output. Alternatively, the controller can sense the current across the synchronous rectifier alone or use lossless inductor sensing for lowest power dissipation.

Single-stage buck conversion allows the MAX1992/MAX1993 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down from another system supply rail instead of the battery) at the maximum switching frequency allows the minimum possible physical size.

The MAX1992 powers the CPU core, chipset, DRAM, or other supply rails as low as 0.7V. The MAX1993 powers chipsets and graphics processor cores, which require dynamically adjustable output voltages. The MAX1993 provides a tracking input that can be used for active termination buses. The MAX1992/MAX1993 are available in a 24-pin thin QFN package with optional overvoltage and undervoltage protection.

For dual step-down PWM controllers with inductor saturation protection, external reference input voltage, and dynamically selectable output voltages, refer to the MAX1540/MAX1541 data sheet.
MAX1992, MAX1992ETG, MAX1993: Typical Operating Circuit MAX1992, MAX1992ETG, MAX1993: Typical Operating Circuit Enlarge+

Key Features

  • Inductor Saturation Protection
  • Accurate Current Limit
  • Ultra-High Efficiency
  • Quick-PWM with 100ns Load-Step Response
  • MAX1992
    • 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output Range
  • MAX1993
    • External Reference Input
    • Dynamically Selectable Output Voltage (0.7V to 5.5V)
    • Optional Power-Good and Fault Blanking During Transitions
  • ±1% VOUT Accuracy Over Line and Load
  • 2V to 28V Battery Input Range (VIN)
  • 200/300/450/600kHz Switching Frequency
  • Overvoltage/Undervoltage Protection Option
  • 1.7ms Digital Soft-Start
  • Drives Large Synchronous Rectifier FETs
  • 2V ±0.7% Reference Output
  • Power-Good Window Comparator

Applications/Uses

  • 1.8V and 2.5V Supplies
  • Active Termination Buses (MAX1993)
  • Core/IO Supplies as Low as 0.7V
  • CPU/Chipset/GPU with Dynamic Voltage Cores
  • DDR Memory Termination (MAX1993)
  • Notebook Computers

See parametric specs for Step-Down Switching Regulators (408)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1993 2280.75.5
1.8
2.5
Preset
Resistor
4ExternalYesYes1300
TQFN/24
$3.96 @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.

MAX1993EVKIT: Evaluation Kit for the MAX1992, MAX1993
Request Reliability Report for: MAX1993 
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 >

 
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