Specification	MAX840ISA+

Applications	Cellular Telephone Transmitter, Charge Pump
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-25 °C
Package / Case	0.154 in
Package / Case	8-SOIC
Package / Case	3.9 mm
Supplier Device Package	8-SOIC
Voltage - Input [Max]	10 VDC
Voltage - Input [Min]	2.5 V
Voltage - Output	-2 V
Voltage - Output [Max]	-9.4 V
Voltage - Output [Min]	-1.5 V

MAX840 Series

Part	Applications	Mounting Type	Package / Case	Package / Case	Package / Case	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output [Max]	Voltage - Output [Min]	Voltage - Output	Number of Outputs	Voltage - Input [Max]	Voltage - Input [Min]
Analog Devices Inc./Maxim Integrated MAX840ESA+	Cellular Telephone Transmitter Charge Pump	Surface Mount	0.154 in	8-SOIC	3.9 mm	8-SOIC	85 °C	-40 C	-9.4 V	-1.5 V	-2 V	1	10 VDC	2.5 V
Analog Devices Inc./Maxim Integrated MAX840ISA	Cellular Telephone Transmitter Charge Pump	Surface Mount	0.154 in	8-SOIC	3.9 mm	8-SOIC	85 °C	-40 C			-2 V	1	10 VDC	2.5 V
Analog Devices Inc./Maxim Integrated MAX840ISA+T	Cellular Telephone Transmitter Charge Pump	Surface Mount	0.154 in	8-SOIC	3.9 mm	8-SOIC	85 °C	-25 °C	-9.4 V	-1.5 V	-2 V	1	10 VDC	2.5 V
Analog Devices Inc./Maxim Integrated MAX840ISA+	Cellular Telephone Transmitter Charge Pump	Surface Mount	0.154 in	8-SOIC	3.9 mm	8-SOIC	85 °C	-25 °C	-9.4 V	-1.5 V	-2 V	1	10 VDC	2.5 V
Analog Devices Inc./Maxim Integrated MAX840ESA+T	Cellular Telephone Transmitter Charge Pump	Surface Mount	0.154 in	8-SOIC	3.9 mm	8-SOIC	85 °C	-40 C	-9.4 V	-1.5 V	-2 V	1	10 VDC	2.5 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	N/A	503	$ 5.77
		700	$ 5.77
	Tube	1	$ 4.86
		10	$ 3.30
		25	$ 2.90
		100	$ 2.65
Mouser	N/A	1	$ 5.77
		10	$ 4.08
		100	$ 3.59
		200	$ 3.27
		500	$ 3.18
		1000	$ 3.11
		2500	$ 3.05

Description

General part information

MAX840 Series

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.ApplicationsCell PhonesContinuously Adjustable GaAsFET BiasGaAsFET Power Amplifier ModulesLCD-Bias Contrast ControlPersonal Communicators, PDAsRegulated Negative Power SuppliesWireless Data Loggers