The MAX1540A/MAX1541 dual pulse-width modulation
(PWM) controllers provide the high efficiency, excellent
transient response, and high DC-output accuracy necessary
for stepping down high-voltage batteries to generate
low-voltage chipset and RAM power supplies in
notebook computers.
The Maxim proprietary Quick-PWM™ controllers are
free running, constant on-time with input feed forward.
This configuration provides ultra-fast transient
response, wide input-output (I/O) differential range, low
supply current, and tight load-regulation characteristics.
The controllers can accurately sense the inductor
current across an external current-sense resistor in
series with the output to ensure reliable overload and
inductor saturation protection. Alternatively, the controllers
can use the synchronous rectifier itself or lossless
inductor current-sensing methods to provide
overload protection with lower power dissipation.
For a single step-down PWM controller with inductor-saturation
protection, external-reference input voltage,
and dynamically selectable output voltages, refer to the
MAX1992/MAX1993 data sheet.
Key Features
Applications/Uses
Inductor-Saturation Protection
Accurate Differential Current-Sense Inputs
Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
MAX1540A
1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1)
2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
Fixed 5V, 100mA Linear Regulator
MAX1541
External Reference Input (REFIN1)
Dynamically Selectable Output Voltage—0.7V to 5.5V (OUT1)
2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
Optional Power-Good and Fault Blanking During Transitions
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 prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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