UNISONIC TECHNOLOGIES CO., LTD
LP2950/2951
100 mA LOW-DROPOUT
VOLTAGE REGULATOR
1
TO-92
LINEAR INTEGRATED CIRCUIT
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.
SOP-8
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.
DIP-8
*Pb-free plating product number:
LP2950L-XX/LP2951L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
LP2950-xx-D08-T
LP2950L-xx-D08-T
LP2950-xx-S08-T
LP2950L-xx-S08-T
LP2950-xx-S08-R
LP2950L-xx-S08-R
LP2950-xx-T92-B
LP2950L-xx-T92-B
LP2950-xx-T92-K
LP2950L-xx-T92-K
LP2951-D08-T
LP2951L-D08-T
LP2951-S08-T
LP2951L-S08-T
LP2951-S08-R
LP2951L-S08-R
Note: xx: Output Voltage Code (For LP2950 only)
LP2950L-xx-S08-R
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Lead Plating
(1) B: Tape Box, K: Bulk, R: Tape Reel, T: Tube
(2) D08: DIP-8, S08: SOP-8, T92: TO-92
(3) xx: refer to Output Voltage Code
(4) L: Lead Free Plating, Blank: Pb/Sn
Package
DIP-8
SOP-8
SOP-8
TO-92
TO-92
DIP-8
SOP-8
SOP-8
Packing
Tube
Tube
Tape Reel
Tape Box
Bulk
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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Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R102-001,J
LP2950/2951
PIN CONFIGURATIONS
UTC LP2950
OUTPUT
1
2
3
LINEAR INTEGRATED CIRCUIT
1
8
INPUT
OUTPUT
1
8
INPUT
SENSE
2
7
FEEDBACK
NC
2
7
NC
OUTPUT
GND
INPUT
SHUTDOWN
3
4
UTC
LP2951
6
5V TAP
SHUTDOWN
3
4
UTC
LP2950
6
NC
GND
5
ERROR
GND
5
ERROR
TO-92 Plastic Package
Bottom View
SOP-8 OR DIP-8 PACKAGE
FOR UTC LP2951
SOP-8 OR DIP-8 PACKAGE
FOR UTC LP2950
BLOCK DIAGRAM
UNREGULATED
DC
FEEDBACK
7
INPUT
8
OUTPUT
1
5V 150mA
MAX.
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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www.unisonic.com.tw
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QW-R102-001,J
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
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.
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
-25°C≦T
J
≦+85°C(Note
1)
V
OUT
×0.98
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
V
OUT
V
OUT
×1.02
V
OUT
V
OUT
×1.02
V
OUT
V
OUT
×1.02
100
0.2
0.2
150
600
140
14
200
220
430
160
100
MAX
1.25
1.27
40
UNIT
V
V
V
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
For UTC LP2951 8-Pin Version Only
PARAMETER
SYMBOL
TEST CONDITION
V
REF
Reference Voltage
V
REF
Over temperature(Note 4)
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)
V
OH
=30V
Output Low Voltage
V
OL
V
IN
=4.5V, I
OL
=400µA
V
THU
(Note 3)
Upper
Threshold Voltage
V
THL
(Note 3)
Lower
V
HYS
(Note 3)
Hysteresis
MIN
1.22
1.19
TYP
1.235
20
50
0.1
UNIT
V
V
nA
ppm/°C
nA/°C
µA
mV
%VO
%VO
mV
1
250
3.2
7.6
15
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QW-R102-001,J
LP2950/2951
ELECTRICAL CHARACTERISTICS(Cont.)
For UTC LP2951 8-Pin Version Only
PARAMETER
Shutdown Input
Input Logic Voltage
Low
High
SYMBOL
V
IL
V
IH
TEST CONDITION
LINEAR INTEGRATED CIRCUIT
MIN
TYP
MAX
UNIT
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.
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: 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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www.unisonic.com.tw
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QW-R102-001,J
LP2950/2951
TYPICAL APPLICATION CIRCUIT
10 Ampere Low Dropout Regulator
CURRENT LIMIT
SECTION
LINEAR INTEGRATED CIRCUIT
+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
100µF
1%
R2
4.7µF
Vout
1
47Ω
0.033µF
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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QW-R102-001,J
电源技术
