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SGM2122-YYN6G Datasheet(PDF) 8 Page - SG Micro Corp

Part # SGM2122-YYN6G
Description  Dual, Low Dropout, 250mA LDO Regulators
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Manufacturer  SGMICRO [SG Micro Corp]
Direct Link  http://www.sg-micro.com
Logo SGMICRO - SG Micro Corp

SGM2122-YYN6G Datasheet(HTML) 8 Page - SG Micro Corp

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Dual, Low Dropout,
250mA LDO Regulators
8
SGM2122
SG Micro Corp
www.sg-micro.com
APPLICATION NOTE
When LDO is used in handheld products, attention must be paid to voltage spikes which could damage SGM2122. In
such applications, voltage spikes will be generated at charger interface and VBUS pin of USB interface when charger
adapters and USB equipments are hot-plugged. Besides this, handheld products will be tested on the production line
without 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 spikes will be generated at the battery connector. The
voltage spikes will be very high, and 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 spikes in cell phone designs. The schematic is shown below.
SGM2122
4.7μF
VOUT 1
2
5
Vcc
Input
EN1
GND
IN
Control
4
6
VOUT 1
C2
C1
1μF
BZM55B5V6
4.7μF
VOUT 2 1
VOUT 2
C3
3 EN2
Control


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