MAX840ISA+ 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$2.75

Distributor Stock
Logo for RS
RS
from US$3.25
82
in stock
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Logo for Newark Electronics
Newark Electronics
from US$3.20
515
in stock
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Logo for element14
element14
from US$3.03
515
in stock
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Farnell
from US$2.75
515
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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


MAX840ISA+ Semiconductors - ICs by Analog Devices

IC GAAS FET BIAS SMD SOIC8 840

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

Specifications

Topology Inverting
Input Voltage Min 2.5V
Input Voltage Max 10V
No. of Outputs 1Outputs
DC / DC Converter IC Case SOIC
No. of Pins 8Pins
Output Current 4mA
Output Voltage Min -9.4V
Output Voltage Max -500mV
Switching Frequency -
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Base Number 840
Frequency Max 120kHz
Frequency Min 80kHz
Frequency Range 80kHz to 120kHz
Logic Function Number 840
Operating Temperature Min -25°C
Operating Temperature Range -40°C to +85°C
Output Voltage -9.4V
Power Dissipation Pd 471mW
Primary Input Voltage 10V
RF Type Cellular
Supply Current 750µA
Supply Voltage Min 2.5V
Supply Voltage Range 2.5V to 10V
Termination Type Surface Mount Device

Alternative Descriptions

Ic, Gaas Fet Bias, Smd, Soic8, 840 | Newark Electronics
IC, GAAS FET BIAS, SMD, SOIC8, 840 | element14
MAX840ISA+,Voltage Regulators | RS

Frequently Asked Questions

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Is the MAX840ISA+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Newark Electronics, element14, Farnell and RS have stock available or on a lead time for MAX840ISA+ .

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