Semiconductor Components Industries, LLC, 2004
August, 2004 - Rev. 9
1
Publication Order Number:
NCP551/D
NCP551, NCV551
150 mA CMOS Low Iq
Low-Dropout Voltage
Regulator
The NCP551 series of fixed output low dropout linear regulators are
designed for handheld communication equipment and portable battery
powered applications which require low quiescent. The NCP551
series features an ultra-low quiescent current of 4.0
mA. Each device
contains a voltage reference unit, an error amplifier, a PMOS power
transistor, resistors for setting output voltage, current limit, and
temperature limit protection circuits.
The NCP551 has been designed to be used with low cost ceramic
capacitors and requires a minimum output capacitor of 0.1
mF. The
device is housed in the micro-miniature TSOP-5 surface mount
package. Standard voltage versions are 1.5, 1.8, 2.5, 2.7, 2.8, 3.0, 3.2,
3.3, and 5.0 V. Other voltages are available in 100 mV steps.
Features
Low Quiescent Current of 4.0
mA Typical
Maximum Operating Voltage of 12 V
Low Output Voltage Option
High Accuracy Output Voltage of 2.0%
Industrial Temperature Range of -40
C to 85
C
(NCV551, T
A
= -40
C to +125
C)
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
Pb-Free Packages are Available
Typical Applications
Battery Powered Instruments
Hand-Held Instruments
Camcorders and Cameras
Figure 1. Representative Block Diagram
Driver w/
Current
Limit
V
in
V
out
Thermal
Shutdown
Enable
GND
OFF
ON
1
3
5
2
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
ORDERING INFORMATION
TSOP-5
(SOT23-5, SC59-5)
SN SUFFIX
CASE 483
1
5
PIN CONNECTIONS AND
MARKING DIAGRAM
1
3
N/C
V
in
2
GND
Enable
4
V
out
5
xxxYW
xxx = Version
Y
= Year
W = Work Week
(Top View)
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2
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Description
1
V
in
Positive power supply input voltage.
2
GND
Power supply ground.
3
Enable
This input is used to place the device into low-power standby. When this input is pulled low, the
device is disabled. If this function is not used, Enable should be connected to V
in
.
4
N/C
No Internal Connection.
5
V
out
Regulated output voltage.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input Voltage
V
in
0 to 12
V
Enable Voltage
V
EN
-0.3 to V
in
+0.3
V
Output Voltage
V
out
-0.3 to V
in
+0.3
V
Power Dissipation and Thermal Characteristics
Power Dissipation
Thermal Resistance, Junction-to-Ambient
P
D
R
q
JA
Internally Limited
250
W
C/W
Operating Junction Temperature
T
J
+150
C
Operating Ambient Temperature
NCP551
NCV551
T
A
-40 to +85
-40 to +125
C
Storage Temperature
T
stg
-55 to +150
C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL-STD-883, Method 3015
Machine Model Method 200 V
2. Latchup capability (85
C)
"
100 mA DC with trigger voltage.
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ELECTRICAL CHARACTERISTICS
(V
in
= V
out(nom.)
+ 1.0 V, V
EN
= V
in
, C
in
= 1.0
m
F, C
out
= 1.0
m
F, T
J
= 25
C, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage (T
A
= 25
C, I
out
= 10 mA)
1.5 V
1.8 V
2.5 V
2.7 V
2.8 V
3.0 V
3.2 V
3.3 V
5.0 V
V
out
1.455
1.746
2.425
2.646
2.744
2.94
3.136
3.234
4.90
1.5
1.8
2.5
2.7
2.8
3.0
3.2
3.3
5.0
1.545
1.854
2.575
2.754
2.856
3.06
3.264
3.366
5.10
V
Output Voltage (T
A
= T
low
to T
high
, I
out
= 10 mA)
1.5 V
1.8 V
2.5 V
2.7 V
2.8 V
3.0 V
3.2 V
3.3 V
5.0 V
V
out
1.440
1.728
2.400
2.619
2.716
2.910
3.104
3.201
4.850
1.5
1.8
2.5
2.7
2.8
3.0
3.2
3.3
5.0
1.560
1.872
2.600
2.781
2.884
3.09
3.296
3.399
5.150
V
Line Regulation (V
in
= V
out
+ 1.0 V to 12 V, I
out
= 10 mA)
Reg
line
-
10
30
mV
Load Regulation (I
out
= 10 mA to 150 mA, V
in
= V
out
+ 2.0 V)
Reg
load
-
40
65
mV
Output Current (V
out
= (V
out
at I
out
= 100 mA) -3%)
1.5 V-2.0 V (V
in
= 4.0 V)
2.1 V-3.0 V (V
in
= 5.0 V)
3.1 V-4.0 V (V
in
= 6.0 V)
4.1 V-5.0 V (V
in
= 8.0 V)
I
o(nom.)
150
150
150
150
-
-
-
-
-
-
-
-
mA
Dropout Voltage (I
out
= 10 mA, Measured at V
out
-3.0%)
1.5 V, 1.8 V, 2.5 V
2.7 V, 2.8 V, 3.0 V, 3.2 V, 3.3 V, 5.0 V
V
in
-V
out
-
-
130
40
220
150
mV
Quiescent Current
(Enable Input = 0 V)
(Enable Input = V
in
, I
out
= 1.0 mA to I
o(nom.)
)
I
Q
-
-
0.1
4.0
1.0
8.0
m
A
Output Voltage Temperature Coefficient
T
c
-
"
100
-
ppm/
C
Enable Input Threshold Voltage
(Voltage Increasing, Output Turns On, Logic High)
(Voltage Decreasing, Output Turns Off, Logic Low)
V
th(en)
1.3
-
-
-
-
0.3
V
Output Short Circuit Current (V
out
= 0 V)
1.5 V-2.0 V (V
in
= 4.0 V)
2.1 V-3.0 V (V
in
= 5.0 V)
3.1 V-4.0 V (V
in
= 6.0 V)
4.1 V-5.0 V (V
in
= 8.0 V)
I
out(max)
160
160
160
160
350
350
350
350
600
600
600
600
mA
3. Maximum package power dissipation limits must be observed.
PD
+
TJ(max)
*
TA
R
q
JA
4. Low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
5. NCP551
T
low
= -40
C
T
high
= +85
C
NCV551
T
low
= -40
C
T
high
= +125
C.
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DEFINITIONS
Load Regulation
The change in output voltage for a change in output
current at a constant temperature.
Dropout Voltage
The input/output differential at which the regulator output
no longer maintains regulation against further reductions in
input voltage. Measured when the output drops 3% below its
nominal. The junction temperature, load current, and
minimum input supply requirements affect the dropout level.
Maximum Power Dissipation
The maximum total dissipation for which the regulator
will operate within its specifications.
Quiescent Current
The quiescent current is the current which flows through
the ground when the LDO operates without a load on its
output: internal IC operation, bias, etc. When the LDO
becomes loaded, this term is called the Ground current. It is
actually the difference between the input current (measured
through the LDO input pin) and the output current.
Line Regulation
The change in output voltage for a change in input voltage.
The measurement is made under conditions of low
dissipation or by using pulse technique such that the average
chip temperature is not significantly affected.
Line Transient Response
Typical over and undershoot response when input voltage
is excited with a given slope.
Thermal Protection
Internal thermal shutdown circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated at typically 160
C,
the regulator turns off. This feature is provided to prevent
failures from accidental overheating.
Maximum Package Power Dissipation
The maximum power package dissipation is the power
dissipation level at which the junction temperature reaches
its maximum operating value, i.e. 125
C. Depending on the
ambient power dissipation and thus the maximum available
output current.
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5
0
3.25
75
50
25
GROUND
CURRENT (
m
A)
3.05
Figure 2. Ground Pin Current versus
Output Current
3.35
I
out
, OUTPUT CURRENT (mA)
3.3
100
150
125
3.1
3.2
3.15
V
out
= 2.8 V
Figure 3. Ground Pin Current versus
Output Current
0
3.35
75
50
25
GROUND
CURRENT (
m
A)
3.15
3.45
I
out
, OUTPUT CURRENT (mA)
3.4
100
150
125
3.2
3.3
3.25
V
out
= 3.3 V
0.5
0
Figure 4. Ground Pin Current versus
Input Voltage
V
in
, INPUT VOLTAGE (VOLTS)
Figure 5. Ground Pin Current versus
Input Voltage
GROUND
PIN CURRENT (
m
A)
0
8
6
4
2
10
12
1
1.5
2
2.5
3
3.5
4
14
V
out(nom)
= 2.8 V
I
out
= 25 mA
0.5
0
V
in
, INPUT VOLTAGE (VOLTS)
GROUND PIN CURRENT (
m
A)
0
8
6
4
2
10
12
1
1.5
2
2.5
3
3.5
4
14
V
out(nom)
= 3.3 V
I
out
= 25 mA
400
0
4
-200
200
-600
6
0
4
600
200
400
200
TIME (
m
s)
Figure 6. Line Transient Response
Figure 7. Line Transient Response
8
0
V
in
= 3.8 V to 4.8 V
V
out
= 2.8 V
C
out
= 1
m
F
I
out
= 10 mA
TIME (
m
s)
-200
0
400
6
800
1600
-400
-400
1200
1000
1400
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
V
in
, INPUT
VOL
T
AGE (V)
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
V
in
, INPUT
VOL
T
AGE (V)
600
400
200
800
160
1200
1000
1400
V
in
= 3.8 V to 4.8 V
V
out
= 2.8 V
C
out
= 1
m
F
I
out
= 100 mA
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400
0
4
-200
200
-600
6
0
4
600
200
400
200
TIME (
m
s)
Figure 8. Line Transient Response
Figure 9. Line Transient Response
0
TIME (
m
s)
-200
0
400
6
800
1600
-400
-400
1200
1000
1400
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
V
in
, INPUT
VOL
T
AGE (V)
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
V
in
, INPUT
VOL
T
AGE (V)
600
400
200
800
1600
1200
1000
1400
V
in
= 4.3 V to 5.3 V
V
out
= 3.3 V
C
out
= 1
m
F
I
out
= 10 mA
V
in
= 3.8 V to 4.8 V
V
out
= 2.8 V
C
out
= 1
m
F
I
out
= 150 mA
-600
400
0
4
-200
200
-600
6
4
500
200
300
100
Figure 10. Line Transient Response
Figure 11. Line Transient Response
0
TIME (
m
s)
-200
0
400
6
700
1900
-400
-400
1100
900
1700
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
V
in
, INPUT
VOL
T
AGE (V)
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
V
in
, INPUT
VOL
T
AGE (V)
400
800
2000
1200
V
in
= 4.3 V to 5.3 V
V
out
= 3.3 V
C
out
= 1
m
F
I
out
= 150 mA
V
in
= 4.3 V to 5.3 V
V
out
= 3.3 V
C
out
= 1
m
F
I
out
= 100 mA
-600
600
800
1500
1300
TIME (
m
s)
600
1600
0
150
3
2
1
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
-1000
TIME (ms)
Figure 12. Load Transient Response ON
Figure 13. Load Transient Response OFF
I
out
= 3.0 mA - 150 mA
TIME (ms)
-500
0
0
4
5
6
7
8
9
I
out
, OUTPUT
CURRENT (mA)
150
1000
-500
0
0
500
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
I
out
, OUTPUT
CURRENT (mA)
0
3
2
1
4
5
6
7
8
9
V
out
= 2.8 V
C
out
= 10 mF
V
out
= 2.8 V
C
out
= 10 mF
I
out
= 3.0 mA - 150 mA
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Figure 14. Load Transient Response OFF
TIME (ms)
Figure 15. Load Transient Response ON
TIME (ms)
150
-500
500
0
150
-500
-1000
0
0
1000
0
3
2
1
4
5
6
7
8
9
0
3
2
1
4
5
6
7
8
9
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
I
out
, OUTPUT
CURRENT (mA)
OUTPUT VOL
T
AGE
DEVIA
TION (mV)
I
out
, OUTPUT
CURRENT (mA)
V
out
= 3.3 V
C
out
= 10 mF
V
out
= 3.3 V
C
out
= 10 mF
I
out
= 3.0 mA - 150 mA
I
out
= 3.0 mA - 150 mA
0
1
600
2
400
200
Figure 16. Turn-On Response
3
V
in
= 4.3 V
V
out
= 3.3 V
R
O
= 3.3 k
V
EN
= 2.0 V
TIME (
m
s)
0
1
3
2
800
2000
1200
1000
1400
V
out
, OUTPUT
VOL
T
AGE (V)
ENABLE
VOL
T
AGE (V)
0
1600 1800
0
1
600
2
400
200
Figure 17. Turn-On Response
3
V
in
= 3.8 V
V
out
= 2.8 V
R
O
= 2.8 k
V
EN
= 2.0 V
TIME (
m
s)
0
1
3
2
800
2000
1200
1000
1400
V
out
, OUTPUT
VOL
T
AGE (V)
ENABLE
VOL
T
AGE (V)
0
1600 1800
C
o
= 1
m
F
C
o
= 10
m
F
C
o
= 1
m
F
C
o
= 10
m
F
Figure 18. Output Voltage versus Input Voltage
Figure 19. Output Voltage versus Input Voltage
0
2
6
4
2
V
out
, OUTPUT VOL
T
AGE (VOL
TS)
0
3
V
in
, INPUT VOLTAGE (VOLTS)
2.5
8
12
10
0.5
1.5
1
V
in
= 0 V to 12 V
V
out(nom)
= 2.8 V
I
out
= 10 mA
C
in
= 1
m
F
C
out
= 1
m
F
V
EN
= V
in
0
2
6
4
2
V
out
, OUTPUT VOL
T
AGE (VOL
TS)
0
3
V
in
, INPUT VOLTAGE (VOLTS)
2.5
8
12
10
0.5
1.5
1
V
in
= 0 V to 12 V
V
out
= 3.3 V
I
out
= 10 mA
C
in
= 1
m
F
C
out
= 1
m
F
V
EN
= V
in
3.5
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APPLICATIONS INFORMATION
A typical application circuit for the NCP551 series is
shown in Figure 20.
Input Decoupling (C1)
A 0.1
mF capacitor either ceramic or tantalum is
recommended and should be connected close to the NCP551
package. Higher values and lower ESR will improve the
overall line transient response.
Output Decoupling (C2)
The NCP551 is a stable Regulator and does not require
any specific Equivalent Series Resistance (ESR) or a
minimum output current. Capacitors exhibiting ESRs
ranging from a few m
W up to 3.0 W can thus safely be used.
The minimum decoupling value is 0.1
mF and can be
augmented to fulfill stringent load transient requirements.
The regulator accepts ceramic chip capacitors as well as
tantalum devices. Larger values improve noise rejection and
load regulation transient response.
Enable Operation
The enable pin will turn on or off the regulator. These
limits of threshold are covered in the electrical specification
section of this data sheet. If the enable is not used then the
pin should be connected to V
in
.
Hints
Please be sure the V
in
and GND lines are sufficiently wide.
When the impedance of these lines is high, there is a chance
to pick up noise or cause the regulator to malfunction.
Set external components, especially the output capacitor,
as close as possible to the circuit, and make leads as short as
possible.
Thermal
As power across the NCP551 increases, it might become
necessary to provide some thermal relief. The maximum
power dissipation supported by the device is dependent
upon board design and layout. Mounting pad configuration
on the PCB, the board material, and also the ambient
temperature effect the rate of temperature rise for the part.
This is stating that when the NCP551 has good thermal
conductivity through the PCB, the junction temperature will
be relatively low with high power dissipation applications.
The maximum dissipation the package can handle is
given by:
PD
+
TJ(max)
*
TA
R
q
JA
If junction temperature is not allowed above the
maximum 125
C, then the NCP551 can dissipate up to
400 mW @ 25
C.
The power dissipated by the NCP551 can be calculated
from the following equation:
Ptot
+
[Vin * Ignd (Iout)]
)
[Vin
*
Vout] * Iout
or
VinMAX
+
Ptot
)
Vout * Iout
IGND
)
Iout
If a 150 mA output current is needed then the ground
current from the data sheet is 4.0
mA. For an
NCP551SN30T1 (3.0 V), the maximum input voltage will
then be 5.6 V.
Battery or
Unregulated
Voltage
Figure 20. Typical Application Circuit
V
out
C1
C2
OFF
ON
+
+
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Output
R
1
2
3
5
4
Input
1.0
m
F
1.0
m
F
Output
1
2
3
5
4
Input
1.0
m
F
1.0
m
F
Q2
Q1
R3
R1
R2
Output
1
2
3
5
4
Input
1.0
m
F
1.0
m
F
Output
1
2
3
5
4
Enable
1.0
m
F
1.0
m
F
C
Output
1
2
3
5
4
Input
1.0
m
F
1.0
m
F
Q1
R
11 V
Figure 21. Current Boost Regulator
Figure 22. Current Boost Regulator with
Short Circuit Limit
Figure 23. Delayed Turn-on
Figure 24. Input Voltages Greater than 12 V
The NCP551 series can be current boosted with a PNP transis-
tor. Resistor R in conjunction with V
BE
of the PNP determines
when the pass transistor begins conducting; this circuit is not
short circuit proof. Input/Output differential voltage minimum is
increased by V
BE
of the pass resistor.
Short circuit current limit is essentially set by the V
BE
of Q2 and
R1. I
SC
= ((V
BEQ2
- ib * R2) / R1) + I
O(max) Regulator
If a delayed turn-on is needed during power up of several volt-
ages then the above schematic can be used. Resistor R, and
capacitor C, will delay the turn-on of the bottom regulator.
A regulated output can be achieved with input voltages that
exceed the 12 V maximum rating of the NCP551 series with
the addition of a simple pre-regulator circuit. Care must be
taken to prevent Q1 from overheating when the regulated
output (V
out
) is shorted to GND
.
Q1
R
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ORDERING INFORMATION
Device
Nominal
Output Voltage
Marking
Package
Shipping
NCP551SN15T1
1.5
LAO
TSOP-5
NCP551SN15T1G
1.5
LAO
TSOP-5
(Pb-Free)
NCP551SN18T1
1.8
LAP
TSOP-5
NCP551SN18T1G
1.8
LAP
TSOP-5
(Pb-Free)
NCP551SN25T1
2.5
LAQ
TSOP-5
NCP551SN25T1G
2.5
LAQ
TSOP-5
(Pb-Free)
NCP551SN27T1
2.7
LAR
TSOP-5
NCP551SN27T1G
2.7
LAR
TSOP-5
(Pb-Free)
NCP551SN28T1
2.8
LAS
TSOP-5
NCP551SN28T1G
2.8
LAS
TSOP-5
(Pb-Free)
NCP551SN30T1
3.0
LAT
TSOP-5
NCP551SN30T1G
3.0
LAT
TSOP-5
(Pb-Free)
3000 / 7
Tape & Reel
NCP551SN33T1
3.3
LAU
TSOP-5
NCP551SN33T1G
3.3
LAU
TSOP-5
(Pb-Free)
NCP551SN50T1
5.0
LAV
TSOP-5
NCP551SN50T1G
5.0
LAV
TSOP-5
(Pb-Free)
NCV551SN15T1
1.5
LFZ
TSOP-5
NCV551SN18T1
1.8
LGA
TSOP-5
NCV551SN25T1
2.5
LGB
TSOP-5
NCV551SN27T1
2.7
LGC
TSOP-5
NCV551SN28T1
2.8
LGD
TSOP-5
NCV551SN30T1
3.0
LGE
TSOP-5
NCV551SN32T1
3.2
LFR
TSOP-5
NCV551SN33T1
3.3
LGG
TSOP-5
NCV551SN50T1
5.0
LGF
TSOP-5
NOTE:
Additional voltages in 100 mV steps are available upon request by contacting your ON Semiconductor representative.
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
6. NCV551 is qualified for automotive use.
NCP551, NCV551
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11
PACKAGE DIMENSIONS
TSOP-5
(SOT23-5, SC59-5)
SN SUFFIX
PLASTIC PACKAGE
CASE 483-02
ISSUE C
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. MAXIMUM LEAD THICKNESS INCLUDES
LEAD FINISH THICKNESS. MINIMUM LEAD
THICKNESS IS THE MINIMUM THICKNESS
OF BASE MATERIAL.
4. A AND B DIMENSIONS DO NOT INCLUDE
MOLD FLASH, PROTRUSIONS, OR GATE
BURRS.
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
2.90
3.10 0.1142 0.1220
B
1.30
1.70 0.0512 0.0669
C
0.90
1.10 0.0354 0.0433
D
0.25
0.50 0.0098 0.0197
G
0.85
1.05 0.0335 0.0413
H
0.013
0.100 0.0005 0.0040
J
0.10
0.26 0.0040 0.0102
K
0.20
0.60 0.0079 0.0236
L
1.25
1.55 0.0493 0.0610
M
0
10
0
10
S
2.50
3.00 0.0985 0.1181
0.05 (0.002)
1
2
3
5
4
S
A
G
L
B
D
H
C
K
M
J
_
_
_
_
*For additional information on our Pb-Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
0.7
0.028
1.0
0.039
mm
inches
SCALE 10:1
0.95
0.037
2.4
0.094
1.9
0.074
NCP551, NCV551
http://onsemi.com
12
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to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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NCP551/D
LITERATURE FULFILLMENT:
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