NCP4681, NCP4684
150 mA, Ultra Low
Quiescent Current, Low
Dropout Regulator
The NCP4681 and NCP4684 are CMOS Linear voltage regulators
with 150 mA output current capability and ultra low supply currents
(1
mA
typ.) The devices are easy to use and include output current
protection and a fully integrated soft−start circuit to minimize inrush
current and to ensure no output voltage overshoot. The NCP4681
includes an Enable function to reduce supply current by using a
Standby mode, while the NCP4684 excludes the Enable pin to avoid
any pull down current, thereby offering the lowest possible current
consumption for battery powered applications in Active mode. For
portable products the devices are available in the exceptionally small
0.8 x 0.8 mm XDFN, along with the SC−70 and SOT23 packages
Features
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MARKING
DIAGRAMS
XXX
XMM
1
SC−70
CASE 419A
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Operating Input Voltage Range: 1.40 V to 5.25 V
Output Voltage Range: 0.8 V to 3.6 V (available in 0.1 V steps)
Output Voltage Accuracy:
±1.0%
Supply Current: 1
mA
(excluding the CE pull down current)
Dropout Voltage: 0.28 V (I
OUT
= 150 mA, V
OUT
= 2.8 V)
Line Regulation: 0.02%/V Typ.
Stable with Ceramic Capacitors: 0.1
mF
or more
Current Fold Back Protection
Build−in Constant Slope Circuit for soft−start function
Available in XDFN4 0.8 x 0.8 mm, SC−70, SOT23 Packages
These are Pb−Free Devices
Battery−powered Equipment
Networking and Communication Equipment
Cameras, DVRs, STB and Camcorders
Home Appliances
XXXMM
SOT−23−5
CASE 1212
1
1
XDFN4
CASE 711AB
1
XM
M
X, XXXX= Specific Device Code
MM
= Date Code
Typical Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
VIN
C1
100n
NCP4681x
VIN
CE
GND
VOUT
VOUT
C2
100n
VIN
C1
100n
NCP4684
VIN
GND
VOUT
VOUT
C2
100n
Figure 1. Typical Application Schematics
©
Semiconductor Components Industries, LLC, 2013
September, 2013
−
Rev. 3
1
Publication Order Number:
NCP4681/D
NCP4681, NCP4684
VIN
VOUT VIN
VOUT
Vref
Vref
CE
Current Limit
CE
GND
Current Limit
GND
NCP4681Hxxxx
NCP4681Dxxxx
VIN
VOUT
Vref
NC
Current Limit
GND
NCP4684xxxx
Figure 2. Simplified Schematic Block Diagram
PIN FUNCTION DESCRIPTION
Pin No.
XDFN0808*
1
2
3
4
−
Pin No.
SC−70
4
3
1
5
2
Pin No.
SOT23
5
2
3
1
4
Pin Name
V
OUT
GND
CE/NC
V
IN
NC
Output pin
Ground
Chip enable pin (Active “H”) / No connection (NCP4684)
Input pin
No connection
Description
*Tab is GND level. (They are connected to the reverse side of this IC.
The tab is better to be connected to the GND, but leaving it open is also acceptable.
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2
NCP4681, NCP4684
ABSOLUTE MAXIMUM RATINGS
Rating
Input Voltage (Note 1)
Output Voltage
Chip Enable Input
Output Current
Power Dissipation XDFN0808
Power Dissipation SC−70
Power Dissipation SOT23
Junction Temperature
Storage Temperature
ESD Capability, Human Body Model (Note 2)
ESD Capability, Machine Model (Note 2)
T
J
T
STG
ESD
HBM
ESD
MM
Symbol
V
IN
V
OUT
V
CE
I
OUT
P
D
Value
6.0
−0.3
to V
IN
+ 0.3
6.0
180
286
380
420
−40
to 150
−55
to 125
2000
200
°C
°C
V
V
Unit
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)
Latch−up Current Maximum Rating tested per JEDEC standard: JESD78.
THERMAL CHARACTERISTICS
Rating
Thermal Characteristics, XDFN 0.8 x 0.8 mm
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
350
238
263
Unit
°C/W
°C/W
°C/W
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3
NCP4681, NCP4684
ELECTRICAL CHARACTERISTICS
−40°C
≤
T
A
≤
85°C; V
IN
= V
OUT(NOM)
+ 1 V or 2.5 V, whichever is greater; I
OUT
= 1 mA, C
IN
= C
OUT
= 0.1
mF,
unless otherwise noted.
Typical values are at T
A
= +25°C.
Parameter
Operating Input Voltage
Output Voltage
T
A
= +25°C
−40°C
≤
T
A
≤
85°C
Output Voltage Temp. Coefficient
Line Regulation
Load Regulation
Dropout Voltage
Test Conditions
(Note 3)
V
OUT
≥
2.0 V
V
OUT
< 2.0 V
V
OUT
≥
2.0 V
V
OUT
< 2.0 V
−40°C
≤
T
A
≤
85°C
V
OUT(NOM)
+ 0.5 V
≤
V
IN
≤
5.0 V
I
OUT
= 1 mA to 150 mA
I
OUT
= 150 mA
0.8 V
≤
V
OUT
< 0.9 V
0.9 V
≤
V
OUT
< 1.0 V
1.0 V
≤
V
OUT
< 1.2 V
1.2 V
≤
V
OUT
< 1.4 V
1.4 V
≤
V
OUT
< 1.7 V
1.7 V
≤
V
OUT
< 2.0 V
2.0 V
≤
V
OUT
< 2.5 V
2.5 V
≤
V
OUT
< 3.0 V
3.0 V
≤
V
OUT
< 3.6 V
Output Current
Short Current Limit
Quiescent Current
Standby Current
CE Pin Threshold Voltage
(NCP4681 only)
CE Pull Down Current
Power Supply Rejection Ratio
Output Noise Voltage
Low Output Nch Tr. On Resistance
V
CE
= 0 V, T
A
= 25°C, NCP4681 only
CE Input Voltage “H”
CE Input Voltage “L”
NCP4681 only
V
OUT
= 1.5 V, V
IN
= 2.5 V,
DV
IN
= 0.2 V
pk−pk
,
I
OUT
= 30 mA, f = 1 kHz
f = 10 Hz to 100 kHz, V
OUT
= 1.5 V, V
IN
= 2.5 V,
I
OUT
= 30 mA
V
IN
= 4 V, V
CE
= 0 V, NCP4681D only
V
OUT
= 0 V
I
OUT
I
SC
I
Q
I
STB
V
CEH
V
CEL
I
CEPD
PSRR
V
N
R
LOW
0.3
25
100
60
1.0
0.4
mA
dB
mV
rms
W
150
50
1
0.1
2
1.0
DV
OUT
/DT
A
Line
Reg
Load
Reg
V
DO
−20
Symbol
V
IN
V
OUT
Min
1.40
x0.99
−20
x0.970
−60
±100
0.02
0
0.96
0.87
0.78
0.64
0.52
0.40
0.32
0.28
0.25
0.10
20
1.40
1.25
1.15
1.00
0.80
0.60
0.48
0.40
0.35
mA
mA
mA
mA
V
Typ
Max
5.25
x1.01
20
x1.025
60
Unit
V
V
mV
V
mV
ppm/°C
%/V
mV
V
3. The maximum Input Voltage of the Electrical Characteristics is 5.25 V. In case of exceeding this specification, the IC must be operated n
condition that the Input Voltage is up to 5.50 V and total operation time is within 500 hours.
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NCP4681, NCP4684
TYPICAL CHARACTERISTICS
1.8
1.6
1.4
1.2
V
OUT
(V)
1.0
0.8
0.6
0.4
0.2
0
0
50
100
150
200
250
300
350
400
1.9 V
V
IN
= 1.8 V
5.25 V
3.5 V
2.0
V
OUT
(V)
1.5
1.0
0.5
0
V
IN
= 4.5 V
2.5 V
3.0
2.5
5.25 V
2.8 V
2.9 V
0
50
100
150
200
250
300
350
400
I
OUT
(mA)
I
OUT
(mA)
Figure 3. Output Voltage vs. Output Current
1.5 V Version (T
J
= 255C)
3.5
3.0
2.5
V
OUT
(V)
2.0
1.5
1.0
0.5
0
0
50
100
150
200
250
300
350
400
0.6
3.6 V
5.25 V
V
IN
= 4.5 V
3.5 V
V
DO
(V)
0.5
Figure 4. Output Voltage vs. Output Current
2.5 V Version (T
J
= 255C)
25°C
0.4
0.3
0.20
−40°C
0.1
0
0
25
50
75
I
OUT
(mA)
100
125
150
T
J
= 85°C
I
OUT
(mA)
Figure 5. Output Voltage vs. Output Current
3.3 V Version (T
J
= 255C)
0.35
0.30
0.25
V
DO
(V)
0.20
0.15
0.10
0.05
0
0
25
50
75
I
OUT
(mA)
100
125
150
T
J
= 85°C
−40°C
25°C
0.30
0.25
0.20
V
DO
(V)
0.15
0.10
0.05
0
Figure 6. Dropout Voltage vs. Output Current
1.5 V Version
25°C
T
J
= 85°C
−40°C
0
25
50
Figure 7. Dropout Voltage vs. Output Current
2.5 V Version
Figure 8. Dropout Voltage vs. Output Current
3.3 V Version
75
I
OUT
(mA)
100
125
150
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