MAX44265 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX44265

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP

Maxim Integrated 

Rail-to-Rail, 200kHz Op Amp

with Shutdown in a Tiny, 6-Bump WLP

Detailed Description

Featuring a maximized ratio of GBW to supply current,

low operating supply voltage, low input bias current,

and rail-to-rail inputs and outputs, the MAX44265 is an

excellent choice for precision or general-purpose, low-

current, low-voltage, battery-powered applications. This

CMOS device consumes an ultra-low 4µA (typ) supply

current and has a 200µV (typ) offset voltage. For addi-

tional power conservation, the IC features a low-power

shutdown mode that reduces supply current to 1nA

(typ) and puts the amplifier’s output in a high-imped-

ance state. This device is unity-gain stable with a

200kHz GBW product, driving capacitive loads up to

30pF. The capacitive load can be increased to 250pF

when the amplifier is configured for a 10V/V gain.

Rail-to-Rail Inputs and Outputs

The IC has a parallel-connected n- and p-channel dif-

ferential input stage that allows an input common-mode

voltage range that extends 100mV beyond the positive

and negative supply rails, with excellent common-mode

rejection. The IC is capable of driving the output to

within 5mV of both supply rails with a 100kΩ load. This

device can drive a 5kΩ load with swings to within 60mV

of the rails. Figure 1 shows the output voltage swing of

the IC configured as a unity-gain buffer powered from a

single 3V supply.

Low Input Bias Current

The IC features ultra-low 1pA (typ) input bias current.

The variation in the input bias current is minimal with

changes in the input voltage due to very high input

impedance (in the order of 1GΩ).

Applications Information

Driving Capacitive Loads

The IC’s amplifier is unity-gain stable for loads up to

30pF. However, the capacitive load can be increased

to 250pF when the amplifier is configured for a mini-

mum gain of 10V/V. Applications that require greater

capacitive-drive capability should use an isolation

resistor between the output and the capacitive load

(Figure 2). Also, in unity-gain applications with relatively

small RL (approximately 5kΩ), the capacitive load can

be increased up to 200pF.

RAIL-TO-RAIL OUTPUT VOLTAGE RANGE

3V

IN_

1V/div

0V

3V

OUT_

1V/div

0V

200µs/div

Figure 1. Rail-to-Rail Output Voltage Range

MAX44265

RISO

RL

CL

AV =

RL

RL + RISO

≈ 1V/V

Figure 2. Using a Resistor to Isolate a Capacitive Load from

the Op Amp

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