NCP3985
Micropower, 150 mA
Low-Noise, High PSRR,
Ultra-Low Dropout BiCMOS
Voltage Regulator
The NCP3985 is 150 mA LDO that provides the engineer with a
very stable, accurate voltage with low noise and high Power Supply
Rejection Ratio (PSRR) suitable for sensitive applications. In order to
optimize performance for battery operated portable applications, the
NCP3985 employs an advanced BiCMOS process to combine the
benefits of low noise and superior dynamic performance of bipolar
elements with very low ground current consumption at full loads
offered by CMOS.
The NCP3985 is stable with small, low value capacitors and is
available in TSOP-5 package.
Features
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MARKING
DIAGRAM
1
TSOP-5
SN SUFFIX
CASE 483
5
XXXAYWG
G
1
5
•
Output Voltage Options:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
- 1.8 V, 2.5 V, 2.75 V, 2.8 V, 3.0 V, 3.3 V
- Contact Factory for Other Voltage Options
Output Current Limit 200 mA
Low Noise (typ 20
mV
rms
)
High PSRR (typ 70 dB)
Stable with Ceramic Output Capacitors as low as 1
mF
Low Sleep Mode Current (max 1
mA)
Active Discharge Circuit
Current Limit Protection
Thermal Shutdown Protection
Direct Replacement for LP3985
These are Pb-Free Devices
Cellular Telephones
Noise Sensitive Applications (Video, Audio)
Analog Power Supplies
PDAs / Palmtops / Organizers / GPS
Battery Supplied Devices
XXX = Specific Device Code
A
= Assembly Location
Y
= Year
W = Work Week
G
= Pb-Free Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
V
in
GND
CE
(Top View)
C
noise
V
out
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 9 of this data sheet.
Typical Applications
V
in
V
in
C
in
V
out
NCP3985
CE
C
noise
GND
V
out
C
noise
C
out
Figure 1. Typical Application Schematic
©
Semiconductor Components Industries, LLC, 2008
1
April, 2008 - Rev. 1
Publication Order Number:
NCP3985/D
NCP3985
V
in
V
out
C
noise
CE
Figure 2. Simplified Block Diagram
PIN FUNCTION DESCRIPTION
Pin No.
1
2
3
Pin Name
V
in
GND
CE
Power Supply Input Voltage
Power Supply Ground
Chip Enable: This pin allows on/off control of the regulator. To disable the device, connect to
GND. If this function is not in use, connect to V
in
. Internal 5 MW Pull Down resistor is connected
between CE and GND.
Noise reduction pin. (Connect 100 nF or 10 nF capacitor to GND)
Regulated Output Voltage
Description
4
5
C
noise
V
out
MAXIMUM RATINGS
Rating
Input Voltage (Note 1)
Chip Enable Voltage
Noise Reduction Voltage
Output Voltage
Maximum Junction Temperature (Note 1)
Storage Temperature Range
Symbol
V
in
V
CE
V
Cnoise
V
out
T
J(max)
T
STG
Value
-0.3 V to 6 V
-0.3 V to V
in
+0.3 V
-0.3 V to V
in
+0.3 V
-0.3 V to V
in
+0.3 V
150
-55 to 150
Unit
V
V
V
V
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: 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
THERMAL CHARACTERISTICS
Rating
Package Thermal Resistance: (Note 1)
Junction-to-Lead (pin 5)
Junction-to-Ambient
Symbol
R
θJA
Value
109
220
Unit
°C/W
1. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area
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2
+
-
Bandgap
Reference
Voltage
Current
Limit
Active
Discharge
GND
NCP3985
ELECTRICAL CHARACTERISTICS
(V
in
= V
out
+ 0.5 V, V
CE
= 1.2 V, C
in
= 0.1
mF,
C
out
= 1
mF,
C
noise
= 10 nF, T
A
= -40°C to 85°C, unless otherwise specified (Note 2))
Characteristic
REGULATOR OUTPUT
Input Voltage
Output Voltage (Note 3)
1.8 V
2.5 V
2.75 V
2.8 V
3.0 V
3.3 V
1.8 V
2.5 V
2.75 V
2.8 V
3.0 V
3.3 V
V
in
= (V
out
+ 0.5 V) to 5.5 V
I
out
= 1 mA
V
in
V
out
2.5
1.764
2.450
2.695
2.744
2.940
3.234
(-2%)
1.746
2.425
2.6675
2.716
2.910
3.201
(-3%)
-
-
-
Reg
line
Reg
load
V
n
-
-
I
LIM
I
SC
V
DO
200
210
-
-
-
-
-
-
-
-
-
-
-
1.2
2.5
-
-
-
-
20
25
310
320
105
105
105
100
100
70
110
0.1
150
20
-
-
5
0.4
4
800
200
-
-
470
490
155
155
155
150
150
90
220
1
-
-
0.4
-
10
-
-
-
-
mA
mA
mV
-0.2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5.5
1.836
2.550
2.805
2.856
3.060
3.366
(+2%)
1.854
2.575
2.8325
2.884
3.090
3.399
(+3%)
-
-
-
0.2
25
%/V
mV
mV
rms
V
V
Test Conditions
Symbol
Min
Typ
Max
Unit
Output Voltage (Note 3)
V
in
= (V
out
+ 0.5 V) to 5.5 V
I
out
= 1 mA to 150 mA
V
out
V
Power Supply Ripple Rejection
V
in
= V
out
+ 0.5 V + 0.5 V
p-p
I
out
= 1 mA to 150 mA
f = 120 Hz
C
noise
= 100nF
f = 1 kHz
f = 10 kHz
V
in
= (V
out
+ 0.5 V) to 5.5 V, I
out
= 1 mA
I
out
= 1 mA to 150 mA
f = 10 Hz to 100 kHz
I
out
= 1 mA to 150 mA C
noise
= 100 nF
C
noise
= 10 nF
V
out
= V
out(nom)
– 0.1 V
V
out
= 0 V
2.5 V
2.75 V
2.8 V
3.0 V
3.3 V
I
out
= 150 mA
PSRR
70
70
55
-
12
dB
Line Regulation
Load Regulation
Output Noise Voltage
Output Current Limit
Output Short Circuit Current
Dropout Voltage (Note 4)
GENERAL
Ground Current
Disable Current
Thermal Shutdown Threshold (Note 5)
Thermal Shutdown Hysteresis (Note 5)
CHIP ENABLE
Input Threshold
Low
High
V
th(CE)
R
PD(CE)
I
out
= 150 mA
C
noise
= 10 nF/100 nF
C
noise
= 10 nF
C
noise
= 100 nF
I
out
= 1 mA
I
out
= 10 mA
t
on
t
off
V
MW
ms
ms
I
out
= 1 mA
I
out
= 150 mA
V
CE
= 0 V
I
GND
I
DIS
T
SD
T
SH
mA
mA
°C
°C
Internal Pull-Down Resistance (Note 6)
TIMING
Turn-on Time
Turn-off Time
2. Performance guaranteed over the indicated operating temperature range by design and/or characterization, production tested at
T
J
= T
A
= 25°C. Low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
3. Contact factory for other voltage options.
4. Measured when output voltage falls 100 mV below the regulated voltage at V
in
= V
out
+ 0.5 V if V
out
< 2.5 V, then V
DO
= V
in
- V
out
at V
in
= 2.5 V.
5. Guaranteed by design and characterization.
6. Expected to disable device when CE pin is floating.
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NCP3985
TYPICAL CHARACTERISTICS
1.820
V
out
, OUTPUT VOLTAGE (V)
V
out
, OUTPUT VOLTAGE (V)
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
-40
-20
0
20
40
60
80
100
I
out
= 1 mA
I
out
= 150 mA
V
out
= 1.8 V
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
-40
-20
0
20
40
60
80
100
I
out
= 150 mA
I
out
= 1 mA
V
out
= 2.5 V
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 3. Output Voltage vs. Temperature
(V
out
= 1.8 V)
2.760
V
out
, OUTPUT VOLTAGE (V)
V
out
, OUTPUT VOLTAGE (V)
2.755
2.750
2.745
2.740
2.735
2.730
2.725
2.720
-40
-20
0
20
40
60
80
I
out
= 1 mA
I
out
= 150 mA
V
out
= 2.75 V
2.820
2.815
2.810
2.805
2.800
Figure 4. Output Voltage vs. Temperature
(V
out
= 2.5 V)
V
out
= 2.8 V
I
out
= 1 mA
I
out
= 150 mA
2.795
2.790
2.785
100
2.780
-40
-20
0
20
40
60
80
100
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 5. Output Voltage vs. Temperature
(V
out
= 2.75 V)
3.020
V
out
, OUTPUT VOLTAGE (V)
V
out
, OUTPUT VOLTAGE (V)
3.015
3.010
3.005
3.000
2.995
2.990
2.985
2.980
-40
-20
0
20
40
60
80
100
I
out
= 150 mA
I
out
= 1 mA
V
out
= 3.0 V
3.320
3.315
3.310
3.305
3.300
3.295
3.290
3.285
3.280
-40
Figure 6. Output Voltage vs. Temperature
(V
out
= 2.8 V)
V
out
= 3.3 V
I
out
= 1 mA
I
out
= 150 mA
-20
0
20
40
60
80
100
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 7. Output Voltage vs. Temperature
(V
out
= 3.0 V)
Figure 8. Output Voltage vs. Temperature
(V
out
= 3.3 V)
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NCP3985
TYPICAL CHARACTERISTICS
4.0
V
out
, OUTPUT VOLTAGE (V)
3.3 V
3.0 V
2.8 V
2.5 V
1.8 V
1.5
1.0
0.5
0.0
0.0
1.0
2.0
3.0
4.0
T
A
= 25°C
I
out
= 1 mA
5.0
6.0
I
GND
, GROUND CURRENT (mA)
3.5
3.0
2.5
2.0
140
130
120
110
100
90
80
70
60
50
40
-40
-20
0
20
40
60
80
100
I
out
= 1 mA
I
out
= 150 mA
V
in
, INPUT VOLTAGE (V)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 9. Output Voltage vs. Input Voltage
200
I
GND
, GROUND CURRENT (mA)
V
out
= 2.8 V
V
DO
, DROPOUT VOLTAGE (mV)
180
160
140
120
100
80
60
40
20
0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
V
out
= 1.8 V
I
out
= 1 mA
V
out
= 2.5 V
T
A
= 25°C
V
out
= 3.3 V
V
out
= 3.0 V
I
out
= 150 mA
135
130
125
120
115
110
105
100
95
90
85
0
Figure 10. Ground Current vs. Temperature
V
out
= 2.5 V
T
A
= 85°C
T
A
= 25°C
T
A
= -40°C
25
50
75
100
125
150
V
in
, INPUT VOLTAGE (V)
I
out
, OUTPUT CURRENT (mA)
Figure 11. Ground Current vs. Input Voltage
125
V
DO
, DROPOUT VOLTAGE (mV)
V
DO
, DROPOUT VOLTAGE (mV)
120
115
110
105
100
95
90
85
80
75
0
25
50
75
100
125
150
I
out
, OUTPUT CURRENT (mA)
T
A
= -40°C
T
A
= 25°C
V
out
= 2.8 V
T
A
= 85°C
125
120
115
110
105
100
95
90
85
80
75
0
Figure 12. Dropout Voltage vs. Output Current
V
out
= 3.0 V
T
A
= 85°C
T
A
= 25°C
T
A
= -40°C
25
50
75
100
125
150
I
out
, OUTPUT CURRENT (mA)
Figure 13. Dropout Voltage vs. Output Current
Figure 14. Dropout Voltage vs. Output Current
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