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Data Sheet

FULL DATA SHEET (PDF, 780kB) Download   E-Mail

Description

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.

An evaluation kit is available:  MAX1541EVKIT   MAX1540EVKIT  

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 Fixed 5V or Adjustable 100mA Linear Regulator 1% VOUT Accuracy over Line and Load 2V to 28V Battery Input Range 170kHz to 620kHz Selectable Switching Frequency Overvoltage/Undervoltage-Protection Option 1.7ms Digital Soft-Start Drives Large Synchronous-Rectifier FETs 2V ±0.7% Reference Output Separate Power-Good Window Comparators		0.7V to 5.5V Supply Rails Active Termination Buses (MAX1541) Core/IO Supplies as Low as 0.7V CPU/Chipset/GPU with Dynamic Voltage Cores DDR Memory Termination (MAX1541) Notebook Computers Supplies (MAX1541)

Diagram

Functional Diagram

Evaluation Kits

MAX1541EVKIT MAX1540EVKIT

Reliability Reports

Reliability Report: MAX1541.pdf Show FIT data for: MAX1540A MAX1541 Request Reliability Report for: MAX1540A

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

MAX1540A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1540AETJ+			Active	TQFN;32 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0012 (PDF) Use pkgcode/variation: T3255+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1540AETJ+T			Active	TQFN;32 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0012 (PDF) Use pkgcode/variation: T3255+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1541	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1541ETL			Active	TQFN;40 pin;37.2 mm² Outline Drawing: 21-0141 (PDF) Land Pattern: 90-0055 (PDF) Use pkgcode/variation: T4066-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1541ETL-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1541ETL+			Active	TQFN;40 pin;37.2 mm² Outline Drawing: 21-0141 (PDF) Land Pattern: 90-0055 (PDF) Use pkgcode/variation: T4066+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1541ETL+T			Active	TQFN;40 pin;37.2 mm² Outline Drawing: 21-0141 (PDF) Land Pattern: 90-0055 (PDF) Use pkgcode/variation: T4066+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2003-10-29

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