SG2003-3.3 datasheet(9/12 Pages) SGMICRO

9 / 12 page

SG2003/A

SG2004/A

９

TYPICAL OPERATING CHARACTERISTICS

VIN = VOUT(NOMINAL) +1V, CIN = 1µF, COUT = 1µF, CBP = 0.01µF, TA = +25℃, unless otherwise noted.

Start Up

Time(10

μs/div)

Application Notes

When LDO is used in handheld products, Attention must be paid to voltage spike which would damage

SG2003 and SG2004. In such applications, voltage spike will be generated at changer interface and VBUS

pin of USB interface when changer adapters and USB equipments are hot-inserted. Besides this, handheld

products will be tested on the production line on the condition of no battery. Test Engineer will apply power

from the connector pin which connects with positive pole of the battery. When external power supply is

turned on suddenly, the voltage spike will be generated at the battery connector. The voltage spike will be

very high, it always exceeds the absolute maximum input voltage (6.0V) of LDO. In order to get robust

design. Design Engineer needs to clear up this voltage spike. Zener diode is a cheap and effective solution to

eliminate such voltage spike. For example, BZM55B5V6 is a 5.6V small package Zener diode which can be

used to remove voltage spike in cell phone design. The schematic is shown in below:

SG2003/SG2004

4.7uF

VOUT

Vcc

Input

GND

BP/FP

Control

VOUT

0.01uF

1uF

BZM55B5V6

VIN = 5V

VOUT = 2.5V

CIN = COUT = 1

μF

ILOAD = 1mA

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