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19-2661; Rev 0; 10/02
Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
General Description Features
MAX1992/MAX1993
The MAX1992/MAX1993 pulse-width modulation (PWM) o Inductor Saturation Protection
controllers provide high-efficiency, excellent transient
response, and high DC output accuracy. The devices o Accurate Current Limit
step down high-voltage batteries to generate low- o Ultra-High Efficiency
voltage CPU core or chipset/RAM supplies in notebook o Quick-PWM with 100ns Load-Step Response
computers.
o MAX1992
Maxim's proprietary Quick-PWMTM quick-response, con-
stant on-time PWM control scheme handles wide 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable
input/output voltage ratios with ease and provides 100ns Output Range
"instant-on" response to load transients, while maintaining o MAX1993
a relatively constant switching frequency. Efficiency is External Reference Input
enhanced by the ability to drive very large synchronous- Dynamically Selectable Output Voltage
rectifier MOSFETs. Current sensing to ensure reliable (0.7V to 5.5V)
overload and inductor saturation protection is available
Optional Power-Good and Fault Blanking
using an external current-sense resistor in series with the
During Transitions
output. Alternatively, the controller can sense the current
across the synchronous rectifier alone or use lossless o