ZXCL300H5TA Diodes Zetex, ZXCL300H5TA Datasheet - Page 8

• Manufacturer Part Number: ZXCL300H5TA
• Description: IC REG LDO MICROPWR 3.0V SC70-5
• Manufacturer: Diodes Zetex

Specifications of ZXCL300H5TA

• Regulator Topology: Positive Fixed
• Voltage - Output: 3V
• Voltage - Input: Up to 5.5V
• Voltage - Dropout (typical): 0.14V @ 100mA
• Number Of Regulators: 1
• Current - Output: 150mA (Max)
• Current - Limit (min): 160mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-70-5, SC-88A, SOT-323-5, SOT-353, 5-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXCL300H5; ZXCL300H5TR

Input to Output Diode
In common with many other LDO regulators, the
ZXCL device has an inherent diode associated
with the output series pass transistor. This diode
has its anode connected to the output and its
cathode to the input. The internal diode is
normally reverse biased, but will conduct if the
output is forced above the input by more than a
VBE (approximately 0.6V). Current will then flow
from V
maximum current in this diode should be
limited to 5mA continuous and 30mA peak. An
external schottky diode may be used to provide
protection when this condition cannot be
satisfied.
Scheme to boost output current to 2A
Issue 8 - October 2007
© Zetex Semiconductors plc 2007
out
to V
in
. For safe operation, the
8
Increased Output current
Any ZXCL series device may be used in
conjunction with an external PNP transistor to
boost the output current capability. In the
application circuit shown below, a FMMT717
device is employed as the external pass
element. This SOT23 device can supply up to
2.5A maximum current subject to the thermal
dissipation limits of the package (625mW).
Alternative devices may be used to supply
higher levels of current. Note that with this
arrangement, the dropout voltage will be
increased by the V
Also, care should be taken to protect the pass
transistor in the event of excessive output
current.
BE
drop of the external device.
ZXCL SERIES
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