1A Ultra Low Dropout Linear Regulator
APPLICATION INFORMATION
TJ3964
Output Adjustment (Adjustable Version)
An adjustable output device has output voltage range of 1.145V to 5.0V. To obtain a desired output
voltage, the following equation can be used with R1 resistor. The sum of R1 and R2 should be in range
of 1kꢀ to 100kꢀ.
INPUT
VIN
EN
VOUT
ADJ
OUTPUT
TJ3964
R2
R1
+
-
+
-
COUT
68uF
CIN
68uF
EN
GND
VOUT
⎛
⎝
⎞
⎠
R2 = R1
−1
⎟
⎜
1.145
To enhance output stability, a capacitor of 68pF to 100pF can be placed in series with VOUT and ADJ.
SENSE Pin
In applications where the regulator output is not very close to the load, the TJ3964 can provide better
remote load regulation characteristics using the SENSE pin. TJ3964 regulates the voltage at the output
pin. Hence, the voltage at the remote load will be lower than the voltage at the output pin as a value of
the voltage drop across the trace series resistance. If the sense option pin is not required, the sense pin
must be connected to the VOUT pin. Connecting the sense pin to the remote load will provide regulation
at the remote load because the TJ3964 regulates the voltage at the sense pin when the sense option pin
is used.
Dec. 2009 – Rev. 1.1
- 8 -
HTC
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
