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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 176kB) Download   E-Mail

Description

The MAX840/MAX843/MAX844 low-noise, inverting charge-pump power supplies are ideal for biasing GaAsFETs in cellular telephone transmitter amplifiers. They operate with inputs down to 2.5V. The MAX840 offers both a -2V preset output and a -0.5V to -9.4V adjustable output. The MAX843/MAX844 use an external positive control voltage to set the negative output voltage. Input voltage range for all the devices is 2.5V to 10V, and output current is 4mA with VIN > 2.7V. These circuits can operate with small capacitors, as low as 0.22µF. An internal linear regulator reduces the MAX840's output voltage ripple to 1mVp-p. With a well-filtered control voltage (VCTRL), the MAX843/MAX844 also achieve less than 1mVp-p typical output ripple. Supply current is 750µA, and reduces to less than 1µA in shutdown (MAX840/MAX843). The MAX844's unregulated output is active in shutdown, with the charge pump switching at 20kHz. It provides a low-power LCD supply.

An evaluation kit is available:  MAX840EVKIT, MAX843EVKIT, MAX844EVKIT  

Key Features		Applications/Uses
Fixed -2V or Adjustable -0.5V to -9.4V Output at 4mA (MAX840) 2.5V to 10V Input Voltage Range Operate with Small Capacitors (as low as 0.22µF) 1mVp-p Output Voltage Ripple Charge-Pump Switching Frequency: 100kHz in Normal Operation 20kHz in Shutdown Mode (MAX844) 1µA Max Logic-Level Shutdown Over Temp. (MAX840/MAX843) Small 8-Pin SO Package		Cell Phones Continuously Adjustable GaAsFET Bias GaAsFET Power Amplifier Modules LCD-Bias Contrast Control Personal Communicators, PDAs Regulated Negative Power Supplies Wireless Data Loggers

Diagram

Typical Operating Circuit

Evaluation Kits

MAX840EVKIT, MAX843EVKIT, MAX844EVKIT

Reliability Reports

Reliability Report: MAX840.pdf MAX843.pdf Show FIT data for: MAX840 MAX843 MAX844 Request Reliability Report for: MAX844

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: 1-22 of 22

MAX840	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX840ESA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX840ESA-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX840ESA+			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX840ESA+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX840ISA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-20°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX840ISA-T			Active	Land Pattern: Not Available	-20°C to +85°C	See data sheet
MAX840ISA+			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-20°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX840ISA+T			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-20°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX843	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX843ISA+			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-20°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX843ISA+T			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-20°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX843ESA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX843ESA-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX843ISA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-20°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX843ISA-T			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-20°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX844	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX844ESA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX844ESA-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX844ESA+			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX844ESA+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX844ISA			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-5*	-20°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX844ISA-T			Active	Land Pattern: Not Available	-20°C to +85°C	See data sheet
MAX844ISA+			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+5*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX844ISA+T			Active	Land Pattern: Not Available	-55°C to +125°C	See data sheet

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