UTC UR3325
LINEAR INTEGRATED CIRCUIT
2 CHANNEL LOW-DROPOUT
VOLTAGE REGULATOR
FEATURES
*Dual Output: 3.3V/1A, 2.5V/1A.
*Output Voltage Precision of
±2%.
*Output consists of PNP power transistor with
low-dropout voltage.
*Built-in over current protection circuit (OCP).
*Built-in Thermal Shut Down Circuit (TSD).
*Ideal for Hard Disk Drives applications.
1
TO-252-5
1: Vcc
2: NC
3: GND
4: V
o1
5: V
O2
PIN DISCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
Vcc
N.C.
GND
Vo
1
Vo
2
Power Supply
Not internally connected
Ground
3.3V Output
2.5V Output
FUNCTION
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R102-017,C
UTC UR3325
BLOCK DIAGRAM
Vcc
PIN 1
LINEAR INTEGRATED CIRCUIT
Vcc
Reference
Voltage
+
-
Vcc
Vo
1
Current
Limit
Sat.
Prevention
PIN 4
Vcc
Vcc
+
-
Vo
2
Thermal
Shut Down
Current
Limit
Sat.
Prevention
PIN 5
NC
PIN 2
PIN 3
GND
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UNISONIC TECHNOLOGIES CO., LTD.
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QW-R102-017,C
UTC UR3325
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
RATINGS
18
1000*
-40 ~ +85
-55 ~ +150
150
ABSOLUTE MAXIMUM RATINGS
(T
a
=25℃)
UNIT
V
mW
°C
°C
°C
Supply Voltage
Vcc
Power dissipation
P
D
Operating temperature range
T
opr
Storage temperature range
T
stg
Junction temperature
T
j
* P
D
derated at 8mW/℃ for temperatures above T
a
=25℃
OPERATING RATINGS
(T
a
=25℃)
PARAMETER
Input Voltage
3.3V Output current
2.5V Output current
SYMBOL
Vcc
Io
1
Io
2
MIN
3.0
MAX
16.0
1
1
UNIT
V
A
A
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, T
a
=25℃, V
CC
=5V unless otherwise specified.)
PARAMETER
Bias Current
3.3V Output
Output Voltage 1
Dropout Voltage 1
Peak Output Current 1
Ripple Rejection 1
Line Regulation 1
SYMBOL
I
B
Vo
1
△V
D1
Io
1
R.R.1
△V
LINE1
TEST CONDITIONS
Io
1
=0mA, Io
2
=0mA
Io
1
=500mA
Io
1
=500mA, Vcc=3.135V
f=120Hz, ein=1Vrms
Io
1
=200mA
Vcc=4V ~ 16V, Io
1
=500mA
Io
1
=0mA ~ 1A
Io
1
=5mA, T
J
=0 ~ 125℃
Vcc=16V
Io
2
=500mA
f=120Hz, ein=1Vrms
Io
2
=200mA
Vcc=4V ~ 16V, Io
2
=500mA
Io
2
=0mA ~ 1A
Io
2
=5mA, T
J
=0 ~ 125℃
MIN
TYP
0.8
MAX
1.5
3.366
0.5
UNIT
mA
V
V
A
dB
3.234
1.0
50
3.30
0.25
1.7
58
5
30
±0.01
270
30
75
mV
mV
%/℃
mA
△V
LOAD1
Load Regulation 1
Temperature Coefficient of Output
T
CVO1
Voltage 1*
Short circuit Output Current 1
I
OS1
2.5V Output
Output Voltage 2
Vo
2
Peak Output Current 2
Io
2
Ripple Rejection 2
R.R.2
2.450
1.0
50
2.50
1.7
58
5
30
±0.01
270
2.550
V
A
dB
△V
LINE2
Line Regulation 2
△V
LOAD2
Load Regulation 2
Temperature Coefficient of Output
T
CVO2
Voltage 2*
Short circuit Output Current 2
I
OS2
Vcc=16V
* Design Guarantee. (Outgoing inspection is not done on all products.)
○
This product is not designed for protection against radioactive rays.
30
75
mV
mV
%/℃
mA
Note: All characteristic are measured with a capacity across the input (0.33μF) and the output (22μF).
Measurement is done at T
A
≒T
J
, and variations in the parameter of all measurement (except for Temperature
Coefficient of Output Voltage)caused by temperature change are not considered.
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UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R102-017,C
UTC UR3325
POWER DISSIPATION
POWER DISSIPATION, P
D
(W)
12.5
10
7.5
5
2.5
0
LINEAR INTEGRATED CIRCUIT
(1) With infinitc Aluminum heat sink
θj-c=12.5
(℃/W)
(2) With no heat sink
θj-a=125.0(
℃
/W)
(1) 10.0
(2) 1.0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE, T
a
(℃)
STANDARD APPLICATION CIRCUIT
Vo
1
Vcc
GND
Vo
2
22μF
+
OR
+
22μF
1Ω
10μF
Ceramic
OR
1Ω
10μF
Ceramic
TEST CIRCUIT FOR EACH CONDITION
V
Vo
1
or
Vo
2
Vcc
GND
0.33μF
A
22μF
+
A
Io
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UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R102-017,C
UTC UR3325
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT FOR RIPPLE REJECTION RATIO
Vcc
ein
V
IN
0.33μF
GND
Vo
1
or
Vo
2
22μF
+
V
Io
APPLICATION INFORMATION
Operation Supply Voltage Range
The circuit functionality is guaranteed within operation of ambient temperature range, as long as it is within
operation supply voltage range. The standard electrical characteristic values are guaranteed at the test circuit
voltage of Vcc=5V. The cannot be guaranteed at other voltages in the operating range of 3.0V~16.0V, homever, the
variation will be small.
●
Input /Output characteristic
V
OUT
Dropout Region Regulation Region
Off Region
2V
(Typ.T
A
=25℃)
3V
V
in
Recommended Operating Region
For proper regulation, this device must be operated in the Recommended Operating Region shown above.
Power Dissipation
Refer to the thermal duration characteristics shown in Fig.3. Also, be sure to use this IC within a power dissipation
rage allowing enough margins.
Output and Bypass Capacitor
To prevent oscillations, place the output capacitor between the output pin and GND for both channel. There is a
possibility for oscillation if capacitor's value changes due to temperature, voltage, etc. More than 22μF electrolytic
capacitor is recommended. If an extremely large value of (over 1000μF) is used, it may cause oscillations at low
frequency. In case of using ceramic capacitor (it is recommended more than 10μF) connect with 1Ω resistance
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UNISONIC TECHNOLOGIES CO., LTD.
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QW-R102-017,C
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