UNISONIC TECHNOLOGIES CO., LTD
LP2950/2951
100 mA LOW-DROPOUT
VOLTAGE REGULATOR
DESCRIPTION
The UTC
LP2950/2951
are monolithic integrated voltage
regulators with low dropout voltage, and low quiescent current. It
includes many features that suitable for different applications.
1
TO-92
1
TO-252
LINEAR INTEGRATED CIRCUIT
FEATURES
* Fixed output versions, 2.5V, 3V, 3.3V, 3.6V and 5V, are
available.
* High accuracy output voltage.
* 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 err flog available for 8 pin
package.
* Output voltage programmable for LP2951.
SOP-8
DIP-8
Lead-free:
LP2950L-XX/LP2951L
Halogen-free: LP2950G-XX/LP2951G
ORDERING INFORMATION
Normal
LP2950-xx-D08-T
LP2950-xx-S08-T
LP2950-xx-S08-R
LP2950-xx-T92-B
LP2950-xx-T92-K
LP2950-xx-TN3-T
LP2950-xx-TN3-R
LP2951-D08-T
LP2951-S08-T
LP2951-S08-R
Note: Pin Assignment: I:V
IN
Ordering Number
Lead Free
LP2950L-xx-D08-T
LP2950L-xx-S08-T
LP2950L-xx-S08-R
LP2950L-xx-T92-B
LP2950L-xx-T92-K
LP2950L-xx-TN3-T
LP2950L-xx-TN3-R
LP2951L-D08-T
LP2951L-S08-T
LP2951L-S08-R
O:V
OUT
G:GND
Halogen Free
LP2950G-xx-D08-T
LP2950G-xx-S08-T
LP2950G-xx-S08-R
LP2950G-xx-T92-B
LP2950G-xx-T92-K
LP2950G-xx-TN3-T
LP2950G-xx-TN3-R
LP2951G-D08-T
LP2951G-S08-T
LP2951G-S08-R
Package
DIP-8
SOP-8
SOP-8
TO-92
TO-92
TO-252
TO-252
DIP-8
SOP-8
SOP-8
Packing
Tube
Tube
Tape Reel
Tape Box
Bulk
Tube
Tape Reel
Tube
Tube
Tape Reel
OUTPUT VOLTAGE CODE(For LP2950)
OUTPUT VOLTAGE
2.5V
3.0V
3.3V
3.6V
5.0V
CODE
25
30
33
36
50
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QW-R102-001.L
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Copyright © 2008 Unisonic Technologies Co., Ltd
LP2950/2951
PIN CONFIGURATIONS
UTC LP2950
LINEAR INTEGRATED CIRCUIT
1
2
3
UTC LP2950
OUTPUT
GND
INPUT
INPUT
GND
OUTPUT
TO-92 Plastic Package Bottom View
SOT-252 Package
OUTPUT
SENSE
1
2
UTC LP2951
8
7
6
5
INPUT
FEEDBACK
5V TAP
OUTPUT
NC
1
2
UTC
LP2950
8
7
6
5
INPUT
NC
NC
SHUTDOWN 3
GND
4
SHUTDOWN 3
GND
4
ERROR
ERROR
SOP-8 OR DIP-8 PACKAGE FOR UTC
LP2951
SOP-8 OR DIP-8 PACKAGE FOR UTC
LP2950
BLOCK DIAGRAM
5V 150mA
MAX.
UNREGULATED
DC
FEEDBACK
7
INPUT
8
OUTPUT
1
SENSE
182kΩ
FROM CMOS
OR TTL
SHUT
DOWN
3
ERROR
AMPLIFIER
60mV
60kΩ
ERROR
1.23
REF
ERROR
DETECTION
COMPARATOR
5V TAP
2
6
1.5
μF
5
330KΩ
TO CMOS
OR TTL
GND
4
FOR UTC LP2951
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QW-R102-001.L
LP2950/2951
ABSOLUTE MAXIMUM RATINGS
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
-0.3 ~ +30
V
Feedback Voltage
V
FB
-1.5 ~ +30
V
Shutdown Voltage
V
SHDN
-0.3 ~ +30
V
Power Dissipation
P
D
Internally Limited
W
Operation Junction Temperature
T
J
-40 ~ +125
°C
Storage Temperature
T
STG
-65 ~ +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.
THERMAL DATA
PARAMETER
Junction-to-Ambient
TO-92
TO-252
SOP-8
DIP-8
TO-92
TO-252
SOP-8
SYMBOL
θ
JA
RATING
160
92
180
105
83
6
45
UNIT
°C/W
Junction-to-Case
θ
JC
°C/W
ELECTRICAL CHARACTERISTICS
(T
J
=25°C, V
IN
=6V, I
L
=100μA, C
L
=1μF, unless otherwise specified.)
For All Version:
PARAMETER
Output Voltage
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage
Ground Current
Dropout Ground Current
Current Limit
Output Noise (10Hz ~ 100KHz)
(Bypass=0.01μF pins 7 to 1
(LP2951))
SYMBOL
V
OUT
V
OUT
TEST CONDITION
MIN
T
J
=25°C (Note 1)
V
OUT
×0.98
V
OUT
×0.98
-25°C≦T
J
≦+85°C(Note
1)
100μA≦I
L
≦100mA,
T
J
≦T
J
(max) V
OUT
×0.98
20
0.03
0.04
50
380
75
8
110
160
0.1
0.1
80
450
120
12
170
200
TYP
MAX
UNIT
V
OUT
V
OUT
×1.02
V
V
OUT
V
OUT
×1.02
V
V
OUT
V
OUT
×1.02
V
100
0.2
0.2
150
600
140
14
200
220
430
160
100
ppm/°C
%
%
mV
μA
mA
μA
mA
μV
TcVo
ΔV
OUT
6V≦V
IN
≦30V
ΔV
OUT
100μA≦I
L
≦100
mA
I
L
=100μA
V
D
I
L
=100mA (Note 2)
I
L
=100μA
I
G
I
L
=100mA
V
IN
=4.5V,I
L
=100μA
I
LIMIT
V
OUT
=0
C
L
=1μF
eN
C
L
=200μF
C
L
=3.3μF
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QW-R102-001.L
LP2950/2951
ELECTRICAL CHARACTERISTICS(Cont.)
For UTC LP2951 8-Pin Version Only
PARAMETER
SYMBOL
V
REF
Reference Voltage
V
REF
Reference Voltage
Feedback pin Bias Current
I
FB
Reference Voltage Temperature
V
REF(TC)
Coefficient
Feedback Bias Current
I
FB(TC)
Temperature Coefficient
Error Comparator
Output Leakage Current
I
O(LEAK)
Output Low Voltage
V
OL
V
THU
Upper
Threshold Voltage
V
THL
Lower
V
HYS
Hysteresis
Shutdown Input
Low
V
IL
Input Logic Voltage
High
V
IH
TEST CONDITION
Over temperature(Note 4)
LINEAR INTEGRATED CIRCUIT
MIN
1.22
1.19
TYP
1.235
20
50
0.1
MAX
1.25
1.27
40
UNIT
V
V
nA
ppm/°C
nA/°C
V
OH
=30V
V
IN
=4.5V, I
OL
=400μA
(Note 3)
(Note 3)
(Note 3)
1
250
3.2
7.6
15
μA
mV
%VO
%VO
mV
Regulator ON
1.3
0.70
V
Regulator OFF
2.0
V
SHDN
=2.4V
30
50
μA
Shutdown Pin Input Current
I
SHDN
V
SHDN
=30V
450
600
μA
V
SHDN
≧2V,
V
IN
≦30V,
V
OUT
=0
Regulator Output Current
I
DFF
3
10
μA
Shutdown
Feedback pin tied to 5V Tap.
Note: 1. Additional conditions for 8-pin versions are FB pin tied to 5V
TAP
, Output tied to Sense (V
OUT
=5V) and
V
SHDN
≤0.8V
.
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.
3. Comparator thresholds are expressed in terms of percentage value of voltage output.
4. V
REF
≤V
OUT
≤(V
IN
-1V), 2.3V≤V
IN
≤30V,
100μA≤I
L
≤100mA,
T
J
≤T
J(MAX)
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QW-R102-001.L
LP2950/2951
TYPICAL APPLICATION CIRCUIT
10 Ampere Low Dropout Regulator
CURRENT LIMIT
SECTION
LINEAR INTEGRATED CIRCUIT
+V
IN
=V
ou
t+0.5V
680
0.05
2N3906
470
UTC
D65H0
8
4.7M
+V
IN
ERROR
5
10k
+
V
OUT
100m A
UTC LP2951
3
220
20k
SD
FB
GND
4
7
R1
1%
R2
4.7 F
100 F
Vout
1
47
0.033 F
V
OUT
=1.23V*(1+R1/R2)
For 5V output use internal resistors.Wire pin 6 to 7 and wire pin 2 to +V
OUT
Fig.1
V
IN
UTC
UTC
UTC
UTC
UTC
LP2950-2.5
LP2950-3.0
LP2950-3.3
LP2950-3.6
LP2950-5.0
V
OUT
Fig.2
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www.unisonic.com.tw
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QW-R102-001.L
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