NCP4671
400 mA, Dual Rail Ultra Low
Dropout Linear Regulator
The NCP4671 is a CMOS Dual Supply Rail Linear Regulator
designed to provide very low output voltages. The Dual Rail
architecture which separates the power for the LDO control circuitry
(provided via the Vbias pin) from the main power path (Vin) offers
ultra−low dropout performance, allowing the device to operate from
input voltages down to 0.9 V and to generate a fixed high accuracy
output voltage as low as 0.6 V.
The NCP4671 offers excellent transient response with very low
quiescent currents. The family is available in a variety of packages:
SC−70, SOT23 and a small, ultra thin 1.2 x 1.2 x 0.4mm XDFN.
Features
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MARKING
DIAGRAMS
•
Bias Supply Voltage Range : 2.4 V to 5.25 V (V
OUT
< 0.8 V)
•
•
•
•
•
•
•
•
•
•
Set V
OUT
+ 1.6 V to 5.25 V (V
OUT
≥
0.8 V)
Power Input Voltage Range : 0.9 V to V
BIAS
(V
OUT
< 0.8 V)
Set V
OUT
+ 0.1 V to V
BIAS
(V
OUT
≥
0.8 V)
Output Voltage Range: 0.6 to 1.5 V (available at 0.1 steps)
Very Low Dropout: 180 mV Typ. at 400 mA
Quiescent Current: 28
mA
Standby Current: 0.1
mA
±15
mV Output Voltage Accuracy (T
A
= 25°C)
High PSRR: 80 dB at 1 kHz (Ripple at VIN)
50 dB at 1 kHz (Ripple at VBIAS)
Current Fold Back Protection Typ. 120 mA
Available in XDFN, SC−70, SOT23 Package
These are Pb−Free Devices
SC−70
CASE 419A
(In Development)
XXX
XMM
1
XDFN6
CASE 711AA
XX
MM
1
XXXMM
SOT−23−5
CASE 1212
1
Typical Applications
•
Battery Powered Equipments
•
Portable Communication Equipments
•
Cameras, VCRs and Camcorders
NCP4671x
VIN
DC/DC
converter
VBIAS
C1
1
m
C2
1
m
GND
VOUT
C3
2
m
2
VOUT
XX, XXX= Specific Device Code
M, MM = Date Code
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 20 of this data sheet.
VIN
CE
Figure 1. Typical Application Schematic
©
Semiconductor Components Industries, LLC, 2012
February, 2012
−
Rev. 2
1
Publication Order Number:
NCP4671/D
NCP4671
NCP4671Hxxxxxxxx
VBIAS
VIN
VBIAS
VIN
VOUT
NCP4671Dxxxxxxxx
VOUT
Vref
Vref
UVLO
Current
Limit
GND
CE
UVLO
Current
Limit
GND
CE
Figure 2. Simplified Schematic Block Diagram
PIN FUNCTION DESCRIPTION
Pin No.
XDFN
1
2
3
4
5
6
Pin No.
SC−70
1
2
5
4
−
3
Pin No.
SOT23
4
2
3
1
−
5
Pin Name
VBIAS
GND
CE
VIN
NC
VOUT
Input Pin 1
Ground Pin
Chip Enable Pin (“H” Active)
Input Pin 2
Not connected
Output Pin
Description
ABSOLUTE MAXIMUM RATINGS
Rating
Bias Supply Input Voltage (Note 1)
Power Supply Input Voltage (for Driver) (Note 1)
Output Voltage
Chip Enable Input
Output Current
Power Dissipation XDFN
Power Dissipation SC−70
Power Dissipation SOT23
Maximum Junction Temperature
Storage Temperature
ESD Capability, Human Body Model (Note 2)
ESD Capability, Machine Model (Note 2)
T
J(MAX)
T
STG
ESD
HBM
ESD
MM
Symbol
V
BIAS
V
IN
V
OUT
V
CE
I
OUT
P
D
Value
6.0
−0.3
to V
BIAS
+ 0.3
−0.3
to V
IN
+ 0.3
6.0
500
400
380
420
150
−55
to 125
2000
200
°C
°C
V
V
Unit
V
V
V
V
mA
mW
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.
1. Refer to ELECTRICAL CHARACTERISTIS and APPLICATION INFORMATION for Safe Operating Area.
2. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per AEC−Q100−002 (EIA/JESD22−A114)
ESD Machine Model tested per AEC−Q100−003 (EIA/JESD22−A115)
Latchup Current Maximum Rating tested per JEDEC standard: JESD78.
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NCP4671
THERMAL CHARACTERISTICS
Rating
Thermal Characteristics, XDFN
Thermal Resistance, Junction−to−Air
Thermal Characteristics, SOT23
Thermal Resistance, Junction−to−Air
Thermal Characteristics, SC−70
Thermal Resistance, Junction−to−Air
Symbol
R
qJA
R
qJA
R
qJA
Value
250
238
263
Unit
°C/W
°C/W
°C/W
ELECTRICAL CHARACTERISTICS
−40°C
≤
T
A
≤
85°C, V
BIAS
= V
CE
= 3.6 V, V
IN
= V
OUT(NOM)
+ 0.5 V, I
OUT
= 1 mA, C
BIAS
= C
IN
= 1.0
mF,
C
OUT
= 2.2
mF,
unless otherwise
noted. Typical values are at T
A
= +25°C.
Parameter
Operating Supply Input Voltage
(Note 3)
Test Conditions
V
OUT
< 0.8 V
V
OUT
≥
0.8 V
V
OUT
< 0.8 V
V
OUT
≥
0.8 V
T
A
= +25
°C
T
A
=
−40°C
to +85°C
Output Voltage Temp. Coefficient
Line Regulation
T
A
=
−40°C
to +85°C
V
BIAS
= 2.4V to 5.0V
V
IN
= V
OUT
+ 0.3 V to 2.4 V
Load Regulation
Dropout Voltage
Output Current
Short Current Limit
Quiescent Current
Standby Current
CE Pin Threshold Voltage
V
OUT
= 0 V
I
OUT
= 0 mA
V
CE
= 0 V, T
A
= 25°C
CE Input Voltage “H”
CE Input Voltage “L”
CE Pull Down Current
VIN Under Voltage Lock Out
Power Supply Rejection Ratio
I
OUT
= 1
mA
I
OUT
= 30 mA, f = 1 kHz, V
IN
Ripple 0.2 V
P−P
I
OUT
= 30 mA, f = 1 kHz, V
BIAS
Ripple
0.2 V
P−P
Output Noise Voltage
Low Output Nch Tr. On Resistance
V
OUT
= 0.6 V, I
OUT
= 30 mA, f = 10 Hz to
100 kHz
D Version only, V
BIAS
= 3.6 V, V
CE
= “L“
V
N
R
LOW
I
OUT
= 1 mA to 400 mA
Load
Reg
I
OUT
I
SC
I
Q
I
STB
V
CEH
V
CEL
I
PD
V
IN_UVLO
PSRR
1
V
OUT
+
0.05
80
50
70
50
mV
rms
W
V
OUT
+
0.1
0.8
0.3
mA
V
dB
400
120
28
0.1
40
3
Please refer to following detailed table.
mA
mA
mA
mA
V
Line
Reg
V
OUT
V
IN
Symbol
V
BIAS
Min
2.4
V
OUT
+
1.6
0.9
V
OUT
+
0.1
−15
−20
±50
0.02
0.02
30
0.10
0.10
50
mV
Typ
Max
5.25
5.25
V
BIAS
V
BIAS
+15
+20
ppm/°C
%/V
mV
V
Unit
V
Operating Power Input Voltage
(Note 3)
Output Voltage
3. If Input Voltage range is between 5.25 V and 5.50 V, the total operational time must be within 500 hrs.
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3
NCP4671
DROPOUT VOLTAGE
(V
DO
[V])
V
DO
[V] @ I
OUT
= 300 mA
V
DO
[V] @ I
OUT
= 200 mA (T
A
= 255C)
V
OUT
/ V
BIAS
0.6 V
0.7 V
0.8 V
0.9 V
1.0 V
1.2 V
1.3 V
1.4 V
1.5 V
*
2.5 V
0.094
0.094
0.098
0.098
3.0 V
0.093
0.093
0.093
0.094
0.094
0.098
0.098
0.098
*
3.3 V
0.093
0.093
0.093
0.093
0.093
0.096
0.096
0.096
0.096
3.6 V
0.092
0.092
0.092
0.092
0.092
0.095
0.095
0.095
0.095
4.2 V
0.092
0.092
0.092
0.092
0.092
0.095
0.095
0.095
0.095
5.0 V
0.091
0.092
0.092
0.092
0.092
0.094
0.095
0.095
0.095
T
A
= 255C
3.6 V
0.115
0.120
0.120
0.120
0.120
0.130
0.130
0.130
0.130
T
A
=
−405C
to +855C
3.6 V
0.180
0.190
0.190
0.190
0.190
0.200
0.200
0.200
0.200
V
DO
[V] @ I
OUT
= 400 mA
T
A
= 255C
3.6 V
0.180
0.180
0.180
0.180
0.180
0.180
0.180
0.180
0.180
T
A
=
−405C
to +855C
3.6 V
0.320
0.320
0.300
0.300
0.280
0.280
0.260
0.260
0.260
*VBIAS voltage must be equal or more than V
OUT(NOM)
+ 1.6 V
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NCP4671
TYPICAL CHARACTERISTICS
0.7
V
OUT
, OUTPUT VOLTAGE (V)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
100
200
300
400
500
600
700
800
900
I
OUT
, OUTPUT CURRENT (mA)
1.10 V
V
IN
= 0.79 V
2.40 V
0.7
V
OUT
, OUTPUT VOLTAGE (V)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
100
200
300
400
500
600
700
800
900
I
OUT
, OUTPUT CURRENT (mA)
1.10 V
V
IN
= 0.79 V
3.60 V
V
BIAS
= 2.40 V
V
BIAS
= 3.60 V
Figure 3. Output Voltage vs. Output Current
0.6 V Version (T
A
= 255C)
0.7
V
OUT
, OUTPUT VOLTAGE (V)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
100
200 300 400 500 600 700
I
OUT
, OUTPUT CURRENT (mA)
800
900
5.25 V
1.10 V
V
IN
= 0.79 V
V
BIAS
= 5.25 V
V
OUT
, OUTPUT VOLTAGE (V)
1.2
Figure 4. Output Voltage vs. Output Current
0.6 V Version (T
A
= 255C)
V
BIAS
= 2.60 V
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200 300 400 500 600 700
I
OUT
, OUTPUT CURRENT (mA)
800
900
V
IN
= 1.22 V
1.50 V
2.60 V
Figure 5. Output Voltage vs. Output Current
0.6 V Version (T
A
= 255C)
1.2
V
OUT
, OUTPUT VOLTAGE (V)
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200
300
400
500
600
700
800
900
I
OUT
, OUTPUT CURRENT (mA)
V
IN
= 1.22 V
1.50 V
3.60 V
V
BIAS
= 3.60 V
V
OUT
, OUTPUT VOLTAGE (V)
1.2
Figure 6. Output Voltage vs. Output Current
1.0 V Version (T
A
= 255C)
V
BIAS
= 5.25 V
1.0
0.8
0.6
0.4
0.2
0.0
V
IN
= 1.22 V
1.50 V
5.25 V
0
100
200
300
400
500
600
700
800
900
I
OUT
, OUTPUT CURRENT (mA)
Figure 7. Output Voltage vs. Output Current
1.0 V Version (T
A
= 255C)
Figure 8. Output Voltage vs. Output Current
1.0 V Version (T
A
= 255C)
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