LTC6652(RevD) Просмотр технического описания (PDF) - Linear Technology

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LTC6652
(Rev.:RevD)

Precision Low Drift Low Noise Buffered Reference

Linear Technology 

LTC6652

Block Diagram

VIN

2

SHDN

3

GND

4

+

BANDGAP

–

VOUT 6

6652 BD

Applications Information

Bypass and Load Capacitors

The LTC6652 voltage references do not require an input

capacitor, but a 0.1µF capacitor located close to the part

improves power supply rejection.

The LTC6652 voltage references are stable with or without

a capacitive load. For applications where an output capaci-

tor is beneficial, a value of 0.1µF to 10µF is recommended

depending on load conditions. The Typical Performance

Characteristics section includes a plot illustrating a region

of marginal stability. Either no or low value capacitors for

any load current are acceptable. For loads that sink current

or light loads that source current, a 0.1µF to 10µF capacitor

has stable operation. For heavier loads that source current

a 0.5µF to 10µF capacitor range is recommended.

The transient response for a 0.5V step on VIN with and

without an output capacitor is shown in Figures 2 and 3,

respectively.

The LTC6652 references with an output of 2.5V and above

are guaranteed to source and sink 5mA. The 1.25V and

2.048V versions are guaranteed to source 5mA and sink

1mA. The test circuit for transient load step response is

shown in Figure 1. Figures 4 and 5 show a 5mA source

and sink load step response without a load capacitor,

respectively.

Start-Up

The start-up characteristic of the LTC6652 is shown in

Figures 8 and 9. Note that the turn-on time is affected by

the value of the output capacitor.

VIN

2, 3

3V

LTC6652-2.5

6 100Ω

CIN

0.1µF

COUT

1µF

VGEN

0.5V

4, 5, 7, 8

6652 F01

Figure 1. Transient Load Test Circuit

6652fd

10

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