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Data Sheet

FULL DATA SHEET (PDF, 352kB) Download   E-Mail

Description

MAX1846/MAX1847 high-efficiency PWM inverting controllers allow designers to implement compact, low-noise, negative-output DC-DC converters for telecom and networking applications. Both devices operate from +3V to +16.5V input and generate -500mV to -200V output. To minimize switching noise, both devices feature a current-mode, constant-frequency PWM control scheme. The operating frequency can be set from 100kHz to 500kHz through a resistor. The MAX1846 is available in an ultra-compact 10-pin µMAX® package. Operation at high frequency, compatibility with ceramic capacitors, and inverting topology without transformers allow for a compact design. Compatibility with electrolytic capacitors and flexibility to operate down to 100kHz allow users to minimize the cost of external components. The high-current output drivers are designed to drive a P-channel MOSFET and allow the converter to deliver up to 30W. The MAX1847 features clock synchronization and shutdown functions. The MAX1847 can also be configured to operate as an inverting flyback controller with an N-channel MOSFET and a transformer to deliver up to 70W. The MAX1847 is available in a 16-pin QSOP package. Current-mode control simplifies compensation and provides good transient response. Accurate current-mode control and over current protection are achieved through low-side current sensing.

Key Features		Applications/Uses
90% Efficiency +3.0V to +16.5V Input Range -500mV to -200V Output Drives High-Side P-channel MOSFET 100kHz to 500kHz Switching Frequency Current-Mode, PWM Control Internal Soft-Start Electrolytic or Ceramic Output Capacitor The MAX1847 also offers: Synchronization to External Clock Shutdown N-Channel Inverting Flyback Option		Automotive Electronic Power Supplies Cell Phone Base Stations CO DSL Line Driver Supplies Industrial Power Supplies Network Equipment Optical Networking Equipment Servers SLIC Supplies VOIP Supplies

Diagram

Typical Operating Circuit

Application Notes

Application Note 735: Layout Considerations for Non-Isolated DC-DC Converters - MAX1846, MAX1847 Application Note 3591: Compensation Calculator for the MAX1846/MAX1847 Inverting DC-DC Converters - MAX1846, MAX1847 Application Note 3843: ±15V Switch-Mode Power Supply Has Wide Input-Voltage Range - MAX1846 Application Note 3943: ±15V or ±12V Output Switch-Mode Power Supply Has Wide Input-Voltage Range - MAX1846

Evaluation Kits

MAX1846EVKIT, MAX1847EVKIT

Reliability Reports

Show FIT data for: MAX1846 MAX1847 Reliability Report: MAX1846EUB.pdf MAX1847EEE.pdf

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: 1-8 of 8
MAX1846	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1846EUB			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1846EUB-T			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1846EUB+			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1846EUB+T			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1847	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1847EEE			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1847EEE-T			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1847EEE+			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1847EEE+T			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2001-09-18  MAX1846, MAX1847Power Supply Cookbook

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