MAX840ESA+ by Analog Devices

Low-Noise, Regulated, -2V GaAsFET Bias


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.

Where to Buy

Prices starting from US$5.03

Distributor Stock
Logo for Farnell
Farnell
from US$5.03
No stock
Buy Now
Logo for Newark Electronics
Newark Electronics
-
-
Buy Now

Features

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)
100kHz in Normal Operation
20kHz in Shutdown Mode (MAX844)
1µA Max Logic-Level Shutdown Over Temp. (MAX840/MAX843)
Small 8-Pin SO Package

Specifications

Topology InverterRegulated
VIN (V) (min) 2.5
VIN (V) (max) 10
IOUT (A) (typ) 0.01
Unadj. VOUT (V) -2
Adj. VOUT (V) (min) -VIN-0.6
Adj. VOUT (V) (max) -0.5
IQ (mA) (max) 1.3
Switching Frequency (kHz) 100
Oper. Temp. (°C) -40 to +85-20 to +85
Package/Pins SOIC (N)/8
BudgetaryPrice (See Notes) 1.95


MAX840ESA+ Semiconductors - ICs by Analog Devices

CHARGE PUMP INV 100KHZ NSOIC-8

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Output Type Fixed
Input Voltage Min 2.5V
Input Voltage Max 10V
DC / DC Converter IC Case NSOIC
No. of Pins 8Pins
Output Current 4mA
Fixed Output Voltage Nom. -2V
Adjustable Output Voltage Min -
Adjustable Output Voltage Max -
Topology Inverting
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Output Voltage Nom. -2V

Alternative Descriptions

CHARGE PUMP, INV, 100KHZ, NSOIC-8 | Farnell
Charge Pump, Inv, 100Khz, Nsoic-8 | Newark Electronics

Frequently Asked Questions

Where can I find additional details, specifications and documents for a MAX840ESA+ ?

Additional datasheets, footprints and schematics for MAX840ESA+ are listed on our Part Details page. You can also find images and similar parts to MAX840ESA+ on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for MAX840ESA+ on our Product Comparison page. Access via the 'View Pricing & Stock' button to view MAX840ESA+ price breaks, MOQs, lead times, inventory and SKUs from distributors.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the MAX840ESA+ you can contact the distributor directly for product support, shipping queries etc.

Is the MAX840ESA+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for MAX840ESA+ have stock available?

Authorised distributors including Farnell and Newark Electronics have stock available or on a lead time for MAX840ESA+ .

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for MAX840ESA+ often in real-time on the comparison pages.

What if I can't find stock of MAX840ESA+ ?

You can fill out our help required form which you can use to request a quote for MAX840ESA+ from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

We use cookies to improve your experience. See our privacy policy.
Okay