Specification	MAX634CSA+

Current - Output	150 mA
Frequency - Switching [Max]	75 kHz
Frequency - Switching [Min]	100 Hz
Function	Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Configuration	Negative
Output Type	Adjustable
Package / Case	0.154 in
Package / Case	8-SOIC
Package / Case	3.9 mm
Supplier Device Package	8-SOIC
Synchronous Rectifier	False
Topology	Buck-Boost
Voltage - Input (Max) [Max]	16.5 V
Voltage - Input (Min) [Min]	2.6 V
Voltage - Output (Max) [Max]	-20 V
Voltage - Output (Min/Fixed)	-2.6 V

MAX634 Series

Part	Voltage - Input (Min) [Min]	Topology	Voltage - Output (Max) [Max]	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Output Configuration	Output Type	Package / Case	Package / Case	Package / Case	Voltage - Output (Min/Fixed)	Function	Number of Outputs	Frequency - Switching [Min]	Frequency - Switching [Max]	Supplier Device Package	Current - Output	Voltage - Input (Max) [Max]
Analog Devices Inc./Maxim Integrated MAX634ESA+T	2.6 V	Buck-Boost	-20 V	Surface Mount	85 C	-40 ¯C	Negative	Adjustable	0.154 in	8-SOIC	3.9 mm	-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-SOIC	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634EPA	2.6 V	Buck-Boost	-20 V	Through Hole	85 C	-40 ¯C	Negative	Adjustable		8-DIP (0.300" 7.62mm)		-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-PDIP	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634ESA+	2.6 V	Buck-Boost	-20 V	Surface Mount	85 C	-40 ¯C	Negative	Adjustable	0.154 in	8-SOIC	3.9 mm	-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-SOIC	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634EPA+
Analog Devices Inc./Maxim Integrated MAX634ESA	2.6 V	Buck-Boost	-20 V	Surface Mount	85 C	-40 ¯C	Negative	Adjustable	0.154 in	8-SOIC	3.9 mm	-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-SOIC	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634MJA/883B	2.6 V	Buck-Boost	-15 V	Through Hole	125 °C	-55 °C	Negative	Adjustable		8-CDIP (0.300" 7.62mm)		-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-CERDIP	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634CSA	2.6 V	Buck-Boost	-20 V	Surface Mount	70 °C	0 °C	Negative	Adjustable	0.154 in	8-SOIC	3.9 mm	-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-SOIC	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634CPA+	2.6 V	Buck-Boost	-20 V	Through Hole	70 °C	0 °C	Negative	Adjustable		8-DIP (0.300" 7.62mm)		-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-PDIP	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634CSA+	2.6 V	Buck-Boost	-20 V	Surface Mount	70 °C	0 °C	Negative	Adjustable	0.154 in	8-SOIC	3.9 mm	-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-SOIC	150 mA	16.5 V
Analog Devices Inc./Maxim Integrated MAX634CPA	2.6 V	Buck-Boost	-20 V	Through Hole	70 °C	0 °C	Negative	Adjustable		8-DIP (0.300" 7.62mm)		-2.6 V	Step-Up/Step-Down	1	100 Hz	75 kHz	8-PDIP	150 mA	16.5 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	0	$ 0.00
		2900	$ 0.00

Description

General part information

MAX634 Series

Maxim’s MAX634 and MAX4391 CMOS DC-DC regulators are designed for simple, efficient, inverting DC-DC converter circuits. The MAX634 and MAX4391 switching regulators provide all control and power handling functions in a compact 8 pin package: a 1.25V bandgap reference, an oscillator, a comparator for output voltage regulation, and a 525mA P-channel output MOSFET. A second comparator is also provided for convenient low battery detection.The operating current is typically 100µA and is nearly independent of output switch current and duty cycle, thus ensuring high efficiency even in low power battery operated systems. Operating in the inverting configuration, the MAX634 and MAX4391 can convert a positive input voltage in the range of +3V to 16.5V to any negative output voltage up to -20V.These devices are pin compatible enhancements of the Raytheon bipolar circuit, RC4391. Improvements include significantly higher efficiency, extended low voltage operation and improved output voltage accuracy (MAX634).Maxim manufactures a broad line of DC-DC converters, including the MAX635, MAX636, and MAX637; which reduce the external component count in fixed -5V, -12V, and -15V output DC-DC converter circuits. See Table 2 on the last page of this data sheet for a summary of other Maxim DC-DC converters.Applications+5V to ±12V or ±15V Power ConversionBoard Level, Local Power Supply GenerationHigh Efficiency Battery Powered DC-DC ConvertersRegulated Negative Output Power SuppliesRegulated Voltage Inverters