UNISONIC TECHNOLOGIES CO., LTD
UR3325
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.
LINEAR INTEGRATED CIRCUIT
*Pb-free plating product number: UR3325L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
UR3325-TN5-R
UR3325L-TN5-R
UR3325-TN5-T
UR3325L-TN5-T
Package
TO-252-5
TO-252-5
Packing
Tape Reel
Tube
UR3325L-TN5-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) TN5: TO-252-5
(3) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2008 Unisonic Technologies Co., Ltd
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UR3325
PIN DISCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
V
CC
N.C.
GND
Vo1
Vo2
Power Supply
Not internally connected
Ground
3.3V Output
2.5V Output
LINEAR INTEGRATED CIRCUIT
FUNCTION
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QW-R102-017.F
UR3325
BLOCK DIAGRAM
Vcc
PIN 1
Vcc
Reference
Voltage
+
-
LINEAR INTEGRATED CIRCUIT
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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UR3325
ABSOLUTE MAXIMUM RATINGS
(Ta=25℃)
PARAMETER
LINEAR INTEGRATED CIRCUIT
RATINGS
UNIT
Supply Voltage
18
V
Power Dissipation
1000
mW
P
D
Derating above 25°C
8
mW/°C
Junction Temperature
T
J
+150
°C
Operating Temperature
T
OPR
-40 ~ +85
°C
Storage Temperature
T
STG
-55 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
SYMBOL
V
CC
RECOMMENDED OPERATING RATINGS
(Ta=25
℃
)
PARAMETER
Input Voltage
3.3V Output current
2.5V Output current
SYMBOL
V
CC
Io1
Io2
MIN
3.0
MAX
16.0
1
1
UNIT
V
A
A
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, Ta=25
℃
, V
CC
=5V unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Bias Current
I
BIAS
I
o1
=0mA, I
o2
=0mA
2.0
2.3
mA
3.3V Output
Output Voltage 1
V
o1
I
o1
=500mA
3.234 3.30 3.366
V
Dropout Voltage 1
△
V
D1
I
o1
=500mA, V
CC
=3.135V
0.25
0.5
V
Peak Output Current 1
I
o1
1.0
1.7
A
f=120Hz, ein=1Vrms
50
58
dB
Ripple Rejection 1
R.R.1
I
o1
=200mA
Line Regulation 1
△
V
LINE1
V
CC
=4V ~ 16V, I
o1
=500mA
5
30
mV
Load Regulation 1
△
V
LOAD1
I
o1
=0mA ~ 1A
30
75
mV
Temperature Coefficient of Output
T
CVO1
I
o1
=5mA, T
J
=0 ~ 125℃
±0.01
%/℃
Voltage 1
Short Circuit Output Current 1
I
OS1
V
CC
=16V
600
mA
2.5V Output
Output Voltage 2
Vo2
I
o2
=500mA
2.450 2.50 2.550
V
Peak Output Current 2
Io2
1.0
1.7
A
f=120Hz, ein=1Vrms
50
58
dB
Ripple Rejection 2
R.R.2
I
o2
=200mA
Line Regulation 2
△
V
LINE2
V
CC
=4V ~ 16V, I
o2
=500mA
5
30
mV
Load Regulation 2
△
V
LOAD2
I
o2
=0mA ~ 1A
30
75
mV
Temperature Coefficient of Output
T
CVO2
I
o2
=5mA, T
J
=0 ~ 125℃
±0.01
%/℃
Voltage 2
Short Circuit Output Current 2
I
OS2
V
CC
=16V
450
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.
UNISONIC TECHNOLOGIES CO., LTD
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UR3325
POWER DISSIPATION
12.5
Power Dissipation, P
D
(W)
10
7.5
5
2.5
0
(1) 10.0
LINEAR INTEGRATED CIRCUIT
(1) With infinitc Aluminum heat sink
θjc=12.5
(℃/W)
(2) With no heat sink
θja=125.0(℃/W)
(2) 1.0
0
25
50
75
100
125
150
Ambient Temperature, T
a
(℃)
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QW-R102-017.F
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