Specification	MAX1540AETJ+T

Clock Sync	False
Control Features	On Time Control, Saturation, Pulse Skipping, Current Limit, Enable, Power Good
Duty Cycle (Max) [Max]	100 %
Frequency - Switching [Max]	620 kHz
Frequency - Switching [Min]	170 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature [Max]	85 C
Operating Temperature [Min]	-40 ¯C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Supplier Device Package	32-TQFN, 5x5
Synchronous Rectifier	True
Topology	Buck
Voltage - Supply (Vcc/Vdd) [Max]	28 V
Voltage - Supply (Vcc/Vdd) [Min]	5.5 V

MAX1540A Series

Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Part	Output Phases	Duty Cycle (Max) [Max]	Output Type	Operating Temperature [Max]	Operating Temperature [Min]	Output Configuration	Control Features	Topology	Synchronous Rectifier	Frequency - Switching [Max]	Frequency - Switching [Min]	Clock Sync	Supplier Device Package	Function	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Number of Outputs	Mounting Type
Analog Devices Inc./Maxim Integrated MAX1540AETJ+T	1	100 %	Transistor Driver	85 C	-40 ¯C	Positive	Current Limit Enable On Time Control Power Good Pulse Skipping Saturation	Buck		620 kHz	170 kHz		32-TQFN 5x5	Step-Down	28 V	5.5 V	2	Surface Mount

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	N/A	0	$ 9.59

Description

General part information

MAX1540A Series

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.Applications0.7V to 5.5V Supply RailsActive Termination Buses (MAX1541)Core/IO Supplies as Low as 0.7VCPU/Chipset/GPU with Dynamic Voltage CoresDDR Memory Termination (MAX1541)Notebook ComputersSupplies (MAX1541)

Documents

Technical documentation and resources

Package Drawing - 32-LFCSP-5X5X0.75

Package Drawing