10p

1n

100n

10µ

100n

1µ

10µ

100µ

1µ

10n

100p

0.1

1

10

100

SETTLING TIME

SLEW RATE

10µ

100µ

1m

10m

10m

100m

1

10

100m

20:

100:

50:

200:

2 k:

600:

1 k:

10µ

100µ

1m

10m

1m

10m

100m

10

200:

2 k:

600:

1 k:

100:

20:

50:

100m

1

LM7332

SNOSAV4B – APRIL 2008 – REVISED JANUARY 2016

www.ti.com

Feature Description (continued)

Figure 48. Steady-State Output Sinking Characteristics

Figure 47. Steady-State Output Sourcing Characteristics

With Load Lines

With Load Lines

7.4 Device Functional Modes

7.4.1 Driving Capacitive Loads

The LM7332 is specifically designed to drive unlimited capacitive loads without oscillations as shown in

Figure 49.

Figure 49. Settling Time and Slew Rate vs Capacitive Load

In addition, the output current handling capability of the device allows for good slewing characteristics even with

large capacitive loads as shown in Figure 49. The combination of these features is ideal for applications such as

TFT flat panel buffers, A/D converter input amplifiers and power transistor driver.

However, as in most operational amplifiers, addition of a series isolation resistor between the operational

amplifier and the capacitive load improves the settling and overshoot performance.

Output current drive is an important parameter when driving capacitive loads. This parameter will determine how

fast the output voltage can change. Referring to Figure 49, two distinct regions can be identified. Below about

10,000 pF, the output slew rate is solely determined by the compensation capacitor value of the operational

amplifier and available current into that capacitor. Beyond 10 nF, the slew rate is determined by the available

output current of the operational amplifier. An estimate of positive and negative slew rates for loads larger than

100 nF can be made by dividing the short circuit current value by the capacitor.

18

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