NCV8702(2013) 데이터 시트보기 (PDF) - ON Semiconductor

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NCV8702
(Rev.:2013)

200 mA, Ultra-Low Quiescent Current, Ultra-Low Noise, LDO Linear Voltage Regulator

ON Semiconductor 

NCV8702

APPLICATIONS INFORMATION

General

The NCV8702 is a high performance 200 mA Low

Dropout Linear Regulator. This device delivers excellent

noise and dynamic performance.

Thanks to its adaptive ground current feature the device

consumes only 10 mA of quiescent current at no−load

condition.

The regulator features ultra−low noise of 11 mVRMS,

PSRR of 68 dB at 1 kHz and very good load/line transient

performance. Such excellent dynamic parameters and small

package size make the device an ideal choice for powering

the precision analog and noise sensitive circuitry in portable

applications. The LDO achieves this ultra low noise level

output without the need for a noise bypass capacitor.

A logic EN input provides ON/OFF control of the output

voltage. When the EN is low the device consumes as low as

typ. 10 nA from the IN pin.

The LDO achieves ultra−low output voltage noise without

the need for additional noise bypass capacitor.

The device is fully protected in case of output overload,

output short circuit condition and overheating, assuring a

very robust design.

Input Capacitor Selection (CIN)

It is recommended to connect a minimum of 1 mF Ceramic

X5R or X7R capacitor close to the IN pin of the device. This

capacitor will provide a low impedance path for unwanted

AC signals or noise modulated onto constant input voltage.

There is no requirement for the min./max. ESR of the

input capacitor but it is recommended to use ceramic

capacitors for their low ESR and ESL. A good input

capacitor will limit the influence of input trace inductance

and source resistance during sudden load current changes.

Larger input capacitor may be necessary if fast and large

load transients are encountered in the application.

Output Decoupling (COUT)

The NCV8702 is designed to be stable with a small 1.0 mF

ceramic capacitor on the output. To assure proper operation

it is strongly recommended to use min. 1.0 mF capacitor with

the initial tolerance of 10%, made of X7R or X5R dielectric

material types.

There is no requirement for the minimum value of

Equivalent Series Resistance (ESR) for the COUT but the

maximum value of ESR should be less than 700 mW.

Larger output capacitors could be used to improve the load

transient response or high frequency PSRR as shown in

typical characteristics. The initial tolerance requirements

can be wider than 10% when using capacitors larger than

1 mF.

It is not recommended to use tantalum capacitors on the

output due to their large ESR. The equivalent series

resistance of tantalum capacitors is also strongly dependent

on the temperature, increasing at low temperature. The

tantalum capacitors are generally more costly than ceramic

capacitors.

The table on this page lists the capacitors which were used

during the IC evaluation.

No−load Operation

The regulator remains stable and regulates the output

voltage properly within the 2% tolerance limits even with

no external load applied to the output.

VIN

2 V ... 5.5 V

C1

IN

OUT

NCV8702

EN

GND

U1

VOUT

0 mA ... 200 mA

C2

Figure 61. Typical Applications Schematics

LIST OF RECOMMENDED CAPACITORS:

Symbol

Manufacturer

Part Number

Kemet

C0402C105K8PACTU

TDK

C1005X5R1A105K

C1, C2

Murata

AVX

GRM155R61A105KE15D

0402ZD105KAT2A

Multicomp

MCCA000571

Panason − ECG

ECJ−0EB0J475M

Description

1 mF Ceramic 10%, 10 V, 0402, X5R

−||−

−||−

−||−

1 mF Ceramic 10%, 50 V, 1206, X7R

4.7 mF Ceramic 20%, 6.3 V, 0402, X5R

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