MAX4036, MAX4037, MAX4038, MAX4039 Low IBIAS, +1.4V/800nA, Rail-to-Rail Op Amps with +1.2V Buffered Reference

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The single MAX4036/MAX4037 and dual MAX4038/MAX4039 operational amplifiers operate from a single +1.4V to +3.6V (without reference) or +1.8V to +3.6V (with reference) supply and consume only 800nA of supply current per amplifier, and 1.1µA for the optional reference. The MAX4036/MAX4038 feature a common-mode input voltage range from 0V to V_DD - 0.4V at V_DD = 1.4V. The MAX4037/MAX4039 feature a 1.232V voltage reference capable of sourcing 100µA and sinking 20µA.

The MAX4036-MAX4039s' Rail-to-Rail outputs drive 5kΩ loads to within 25mV of the rails. Ultra-low supply current, low operating voltage, and rail-to-rail outputs make the MAX4036-MAX4039 ideal for use in singlecell lithium-ion (Li+), or two-cell NiCd/NiMH/alkaline battery-powered applications.

The MAX4036 is available in an SC70 package, the MAX4037 in a SOT23 package, and the MAX4038/MAX4039 in UCSP™, µMAX®, and TDFN packages.

Key Features

Applications/Uses

Ultra-Low 800nA per Amplifier Supply Current
Ultra-Low 1.4V Supply Voltage Operation (1.8V for MAX4037/MAX4039)
Rail-to-Rail Outputs Drive 5kΩ and 5000pF Load
1.232V ±0.5%, 120ppm/°C (max) Reference (MAX4037/MAX4039)
No External Reference Bypass Capacitor Required
No Phase Reversal for Overdriven Inputs
Low 1.0pA (typ) Input Bias Current
Low 200µV Input Offset Voltage
Unity-Gain Stable
Available in Tiny UCSP, SC70, SOT23, TDFN, and µMAX Packages
Available in -40°C to +125°C Temperature Range (MAX4036A/MAX4038A)

	Active Badges
	Battery-Powered/Solar-Powered Systems
	Electrometer Amplifiers
	Micropower Thermostats and Potentiostats
	Pagers and Cell Phones
	pH Meters
	Portable Medical Instrumentation
	Remote Sensor Amplifiers

Key Specifications: Operational Amplifiers
Part Number	Amps Per Pkg.	Rail to Rail	Min. Stable Closed Loop Gain (V/V)	Min. Total Supply (V)	Max. Total Supply (V)	Typ. Supply Current per Amp. (µA)	Max. V_OS (µV)	Typ. CMRR @ DC (dB)	Typ PSRR @ DC (dB)	Max. Input I_BIAS (nA)	Typ. Unity Gain BW (MHz)	Typ. Slew Rate (V/µs)	Input Voltage Noise Density (nV/√Hz)	Low Power Shutdown	Package	Smallest Available Package (max w/pins) (mm²)	Operating Temp. Range (°C)	Price^*
MAX4036	1	Output Only	1	1.4	3.6	0.8	2,000	70	82	0.01	0.004	0.0004	500	No	SC-70/5	5	-40 to +85	$0.48 @ 1k
MAX4037	1					1.9			84						SOT-23/6	9		$0.58 @ 5k
MAX4038	2					0.8			82						THIN QFN (Dual)/8 UCSP/9 uMAX/8	2		$0.69 @ 1k
MAX4039	2					1.4			84						THIN QFN (Dual)/10 UCSP/9 uMAX/10	2		$0.84 @ 1k
See All Operational Amplifiers (143)

Notes:
^*This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.