t6328a TM Technology Inc., t6328a Datasheet - Page 4

• Manufacturer Part Number: t6328a
• Description: 500ma Low Dropout Voltage Regulator
• Manufacturer: TM Technology Inc.

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T6328A
Applications Information
Like any voltage regulator, the external capacitors used for the T6328A must be carefully selected
for regulator stability and performance. Using a capacitor whose value is > 1uF on the T6328A
input and the amount of capacitance can be increased without limit. The input capacitor must be
located a distance of not more than 0.5 inch from the input pin of the IC and returned to a clean
analog ground. Any good quality ceramic or tantalum can be used for this capacitor. The capacitor
with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-
transient response.
The output capacitor must meet both requirements for minimum amount of capacitance and ESR in
all voltage regulator application. The T6328A is designed specifically to work with low ESR
ceramic output capacitor in space-saving and performance consideration. Using a ceramic capacitor
whose value is at least 1uF with ESR is more than 20mΩ on the T6328A output ensures stability.
The T6328A still works well with output capacitor of other types due to the wide stable ESR range.
Output capacitor of larger capacitance can reduce noise and improve load transient response,
stability and PSRR.The output capacitor should be located with in 0.5 inch from the VOUT pin of
the T6328A and returned to a clean analog ground.
Enable Function
The T6328A features an voltage regulator enable/disable function. To assure the T6328A voltage
regulator will switch on, the EN turn on control level must be greater than 1.2V. The T6328A
voltage regulator will go into shutdown mode when the voltage on the EN pin falls below 0.4V. The
T6328A equips a quick-discharge function to protect the system. When the regulator is turned off
by EN pin, the internal MOSFET between VOUT and GND will be turned on to discharge output
voltage quickly. If the enable function is not needed in a specific application, it may be tied to
GND/VIN to keep the voltage regulator in a continuously on state.
TM Technology Inc. reserves the right
P. 4
Publication Date: OCT. 2007
to change products or specifications without notice.
Revision: A