UTC UR3325
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R102-017,C
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.
PIN NAME
FUNCTION
1 Vcc
Power
Supply
2
N.C.
Not internally connected
3 GND
Ground
4 Vo
1
3.3V
Output
5 Vo
2
2.5V
Output
UTC UR3325
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R102-017,C
BLOCK DIAGRAM
Reference
Voltage
Current
Limit
Sat.
Prevention
Sat.
Prevention
Thermal
Shut Down
Vo
2
NC
PIN 5
PIN 2
PIN 4
Vo
1
Vcc
Vcc
Current
Limit
Vcc
Vcc
Vcc
PIN 1
PIN 3
GND
+
-
+
-
UTC UR3325
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R102-017,C
ABSOLUTE MAXIMUM RATINGS
(T
a
=25)
PARAMETER SYMBOL
RATINGS
UNIT
Supply Voltage
Vcc
18
V
Power dissipation
P
D
1000*
mW
Operating temperature range
T
opr
-40 ~ +85
C
Storage temperature range
T
stg
-55 ~ +150
C
Junction temperature
T
j
150
C
* P
D
derated at 8mW/ for temperatures above T
a
=25
OPERATING RATINGS
(T
a
=25)
PARAMETER SYMBOL
MIN MAX UNIT
Input Voltage
Vcc
3.0
16.0
V
3.3V Output current
Io
1
1
A
2.5V Output current
Io
2
1
A
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, T
a
=25, V
CC
=5V unless otherwise specified.)
PARAMETER SYMBOL
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
Bias Current
I
B
Io
1
=0mA, Io
2
=0mA
0.8
1.5
mA
3.3V Output
Output Voltage 1
Vo
1
Io
1
=500mA
3.234 3.30 3.366 V
Dropout Voltage 1
V
D1
Io
1
=500mA, Vcc=3.135V
0.25
0.5
V
Peak Output Current 1
Io
1
1.0 1.7
A
Ripple Rejection 1
R.R.1
f=120Hz, ein=1Vrms
Io
1
=200mA
50 58 dB
Line Regulation 1
V
LINE1
Vcc=4V ~ 16V, Io
1
=500mA
5 30
mV
Load Regulation 1
V
LOAD1
Io
1
=0mA ~ 1A
30
75
mV
Temperature Coefficient of Output
Voltage 1*
T
CVO1
Io
1
=5mA, T
J
=0 ~ 125
0.01
%/
Short circuit Output Current 1
I
OS1
Vcc=16V
270 mA
2.5V Output
Output Voltage 2
Vo
2
Io
2
=500mA
2.450 2.50 2.550 V
Peak Output Current 2
Io
2
1.0 1.7
A
Ripple Rejection 2
R.R.2
f=120Hz, ein=1Vrms
Io
2
=200mA
50 58 dB
Line Regulation 2
V
LINE2
Vcc=4V ~ 16V, Io
2
=500mA 5 30
mV
Load Regulation 2
V
LOAD2
Io
2
=0mA ~ 1A
30
75
mV
Temperature Coefficient of Output
Voltage 2*
T
CVO2
Io
2
=5mA, T
J
=0 ~ 125
0.01
%/
Short circuit Output Current 2
I
OS2
Vcc=16V
270 mA
* Design Guarantee. (Outgoing inspection is not done on all products.)
This product is not designed for protection against radioactive rays.
Note: All characteristic are measured with a capacity across the input (0.33F) and the output (22F).
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.
UTC UR3325
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R102-017,C
POWER DISSIPATION
12.5
10
7.5
5
2.5
0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE, T
a
()
POWER DISSIPATION, P
D
(W)
(1) With infinitc Aluminum heat sink
j-c=12.5 (/W)
(2) With no heat sink
j-a=125.0( /W)
(2) 1.0
(1) 10.0
STANDARD APPLICATION CIRCUIT
Vo
1
Vo
2
GND
Vcc
22F
OR
10F
Ceramic
1
22F
+
+
1
OR
10F
Ceramic
TEST CIRCUIT FOR EACH CONDITION
Vo
1
or
Vo
2
GND
Vcc
22F
Io
+
A
0.33F
V
A
UTC UR3325
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R102-017,C
TEST CIRCUIT FOR RIPPLE REJECTION RATIO
Vo
1
Vo
2
GND
Vcc
22F
Io
+
0.33F
V
ein
V
IN
or
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
Dropout Region Regulation Region
Recommended Operating Region
Off Region
V
OUT
2V
3V
(Typ.T
A
=25)
V
in
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 22F electrolytic
capacitor is recommended. If an extremely large value of (over 1000F) is used, it may cause oscillations at low
frequency. In case of using ceramic capacitor (it is recommended more than 10F) connect with 1 resistance
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