UTC LP2950/2951
LINEAR INTEGRATED CIRCUIT
100 mA LOW-DROPOUT VOLTAGE
REGULATOR
DESCRIPTION
The UTC LP2950/2951 is a monolithic integrated voltage
regulator with low dropout voltage, and low quiescent current.
It includes many features that suitable for different
applications. Available in 3-pin TO-92, DIP-8 and SOP-8
packages.
1
TO-92
SOP-8
FEATURES
*High accuracy 2.5, 3.0, 3.3, 3.6 or 5V fixed output for
TO-92, SOP-8 package.
*Extremely low quiescent current and dropout voltage.
*Extremely tight load and line regulation.
*Current and thermal limiting.
*Very low temperature coefficient.
*Logic controlled shutdown and error flag available for DIP
and SOP package.
*Output voltage programmable for DIP and SOP package.
DIP-8
APPLICATIONS
*Battery powered equipment.
*High efficient linear regulator down to 1.24V.
*Cellular phones.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R102-001,H
UTC LP2950/2951
PIN CONFIGURATIONS
LINEAR INTEGRATED CIRCUIT
UTC LP2950
1
2
3
OUTPUT
GND
INPUT
TO-92 Plastic Package
Bottom View
OUTPUT
SENSE
SHUTDOWN
1
2
8
7
6
5
INPUT
FEEDBACK
5V TAP
3
4
UTC
LP2951
GND
ERROR
SOP-8 OR DIP-8 PACKAGE
FOR UTC LP2951
OUTPUT
NC
SHUTDOWN
1
2
8
7
6
5
INPUT
NC
NC
3
4
UTC
LP2950
GND
ERROR
SOP-8 OR DIP-8 PACKAGE
FOR UTC LP2950
Fig.1
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R102-001,H
UTC LP2950/2951
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
UNRAGULATED
DC
FEEDBACK
7
INPUT
8
OUTPUT
1
5V 150mA
MAX.
SENSE
182kΩ
5V TAP
60kΩ
ERROR
1.23
REF
ERROR
DETECTION
COMPARATOR
2
6
1.5
µF
FROM CMOS
OR TTL
SHUT
DOWN
3
ERROR
AMPLIFIER
60mV
330KΩ
5
TO CMOS
OR TTL
GND
4
FOR UTC LP2951
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Feedback Voltage
Shutdown Voltage
Storage Temperature
Operating Junction Temperature
SYMBOL
Vcc
Vfeedback
Vshutdown
Tstr
Tj
VALUE
-0.3~+30
-1.5~+30
-0.3~+30
-65~+150
-40~+125
UNIT
V
V
V
°C
°C
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R102-001,H
UTC LP2950/2951
PARAMETER
Output Voltage
LINEAR INTEGRATED CIRCUIT
TEST CONDITION
T
J
=25°C (Note 1)
-25°C≦T
J
≦+85°C
(Note 1)
100µA≦I
L
≦100
mA
Tj<=Tj(max) (Note 1)
MIN
Vo×0.98
Vo×0.98
Vo×0.98
20
6V≦V
IN
≦30V
100µA≦I
L
≦100
mA
I
L
=100µA
I
L
=100mA (Note 2)
I
L
=100µA
I
L
=100mA
V
IN
=4.5V,I
L
=100µA
Vout=0
C
L
=1µF
C
L
=200µF
C
L
=3.3µF
(Bypass=0.01µF
pins 7 to (
utc
2951))
0.03
0.04
50
380
75
8
110
160
0.1
0.1
80
450
120
12
170
200
TYP
Vo
Vo
Vo
MAX
Vo×1.02
Vo×1.02
Vo×1.02
100
0.2
0.2
150
600
140
14
200
220
430
160
100
ELECTRICAL CHARACTERISTICS
(Tested at Tj=25°C, V
IN
=6V, I
L
=100µA and C
L
=1µF, unless otherwise specified)
PART NUMBER
UTC LP2950-XX
UTC LP2951
UTC LP2950-XX
UTC LP2951
UTC LP2950-XX
UTC LP2951
UNIT
V
V
V
ppm/°C
%
%
mV
µA
mA
µA
mA
Output Voltage
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage
Ground Current
Dropout Ground Current
Current Limit
Output Noise
10Hz ~ 100KHz
µV
For LP2951 8-Pin version only
Reference Voltage
Reference Voltage
Feedback pin Bias Current
Reference Voltage
Temperature Coefficient
Feedback Bias Current
temperature Coefficient
(Note 4)
1.22
1.19
1.235
20
50
0.1
V
OH
=30V
V
IN
=4.5V, I
OL
=400µA
(Note 3)
(Note 3)
(Note 3)
1
250
3.2
7.6
15
1.3
Low(Regulator ON)
High(Regulator OFF)
V
shutdown
=2.4V
V
shutdown
=30V
Vshutdown≧2V, V
IN
≦
30V, V
out
=0,
Feedback pin tied to 5V
Tap.
0.70
2.0
30
450
3
50
600
10
µA
µA
µA
V
1.25
1.27
40
V
V
nA
ppm/°C
nA/°C
µA
mV
%V
O
%V
O
mV
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output
Current Shutdown
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R102-001,H
UTC LP2950/2951
LINEAR INTEGRATED CIRCUIT
Note 1: Additional conditions for 8-pin versions are feedback tied to 5V Tap an Output tied to Output Sense
(V
out
=5V) and Vshutdown<=0.8V.
Note 2:Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV
below its nominal value measured at 1V differential.
Note 3:Comparator thresholds are expressed in terms of percentage value of voltage output.
Note 4:Vref≤Vout≤(Vin-1V), 2.3V≤Vin≤30V, 100µA≤I
L
≤100mA,
T
J
≤T
JMAX
APPLICATION CIRCUIT
(10 Ampere Low Dropout Regulator)
CURRENT
LIMIT
SECTION
+V
IN
=V
ou
t+0.5V
680Ω
0.05Ω
2N3906
470Ω
UTC
D65H0
4.7MΩ
8
+V
IN
ERROR
5
10kΩ
+
V
OUT
100m A
UTC LP2951
3
220Ω
20kΩ
SD
FB
GND
4
7
R1
1%
R2
4.7µF
100µF
Vout
1
47Ω
0.033µF
Vout=1.23V*(1+R1/R2)
For 5V output
use internal resistors.Wire pin 6 to 7
and wire pin 2 to +V
out
Fig.2
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R102-001,H
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