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MAX840ESA+ The MAX840ESA+ from Analog Devices Inc. is a low-noise, inverting charge-pump power supply ideal for biasing GaAsFETs. It operates with inputs from 2.5V to 10V and provides a fixed -2V output or an adjustable output from -0.5V to -9.4V.
Mfr Part #:

MAX840ESA+

Available from 1 distributors
Mfr Name: Analog Devices / Maxim Integrated
Analog Devices / Maxim Integrated
The MAX840ESA+ from Analog Devices Inc. is a low-noise, inverting charge-pump power supply ideal for biasing GaAsFETs. It operates with inputs from 2.5V to 10V and provides a fixed -2V output or an adjustable output from -0.5V to -9.4V.
✓ Total Stock: 169 pcs
$ Price Range: $0.75

MAX840ESA+ Available from 1 distributor

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Speed Components Ltd ✓
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169 pcs
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MAX840ESA+ Specifications Quick View

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MAX840ESA+ Description

Short technical summary and product information.

The MAX840ESA+ is a low-noise, inverting charge-pump power supply designed by Analog Devices Inc. (formerly Maxim Integrated) for applications such as biasing GaAsFETs in cellular telephone transmitter amplifiers. It accepts an input voltage range of 2.5V to 10V and can deliver up to 4mA of output current. The MAX840ESA+ offers a fixed -2V preset output, or an adjustable output ranging from -0.5V to -9.4V, controlled by an external voltage.

 

This device is designed to operate with small capacitors, as low as 0.22µF, and features an internal linear regulator that reduces output voltage ripple to a mere 1mVp-p. The charge pump operates at 100kHz in normal mode and can enter a low-power shutdown mode (for MAX840/MAX843 variants) drawing less than 1µA. The MAX844 variant's unregulated output remains active in shutdown at 20kHz, suitable for low-power LCD supplies.

 

The MAX840ESA+ is housed in a compact 8-pin SOIC package, suitable for surface mounting. Its low noise and regulated negative output make it a versatile solution for GaAsFET bias, personal communicators, PDAs, and wireless data loggers.

MAX840ESA+ Quick Information

Product Type: Charge Pump Voltage Regulator
Canonical Name: MAX840ESA+ Low-Noise Inverting Charge-Pump Power Supply
Subcategory: Voltage Regulators - Special Purpose

MAX840ESA+ Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

MAX840ESA+ Estimated Pricing

Qty Low High
1+ $0.75 $0.75

Estimated market price range - modelled values for guidance only, not live distributor offers.

MAX840ESA+ Features

  • Low-noise inverting charge-pump power supply.
  • Fixed -2V or adjustable output voltage.
  • Operates with small capacitors as low as 0.22µF.
  • 1mVp-p output voltage ripple.
  • Compact 8-pin SOIC package.

MAX840ESA+ Applications

  • Ideal for GaAsFET bias applications.
  • Suitable for cellular telephone transmitters.
  • Used in personal communicators and PDAs.
  • Provides regulated negative power supplies.
  • Can be used for LCD bias contrast control.

MAX840ESA+ FAQs

7 frequently asked questions generated from this part’s specifications.
What is the input voltage range of the MAX840ESA+?

The input voltage range is 2.5V to 10V.

What output voltages can the MAX840ESA+ provide?

The device can provide a preset -2V output or an adjustable output from -0.5V to -9.4V.

What is the maximum output current?

The output current is 4mA with VIN greater than 2.7V.

What is the supply current consumption?

The supply current is typically 750µA, and less than 1µA in shutdown.

What switching frequency does the charge pump operate at?

The normal switching frequency is 100kHz; the MAX844 variant reduces to 20kHz in shutdown mode.

What package does the MAX840ESA+ come in?

It is available in an 8-SOIC surface-mount package (0.154", 3.90mm Width).

What is the operating temperature range?

The device operates from -40°C to +85°C.

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