600mA LOW DROPOUT LINEAR REGULATOR
600mA ULDO REGULATOR WITH ENABLE
General Description
The AP2318 is a series of ultra low dropout regulators
optimized for low voltage applications where transient
response and minimum input voltage are critical.
The AP2318 provides current limit and thermal
shutdown. Its circuit includes a trimmed bandgap
reference to assure output voltage accuracy to be
within
±1%.
On-chip thermal shutdown provides
protection against any combination of overload and
ambient temperatures that would create excessive
junction temperatures.
The AP2318 has both fixed and adjustable versions.
The 1.3V fixed versions integrate the corresponding
resistor divider. The adjustable version can set the
output voltage through two external resistors.
The AP2318 is available in the standard DFN-3×3-8
and SOIC-8 packages.
Data Sheet
AP1117M
AP2318
Features
·
·
·
·
·
Wide Operating Voltage Ranges: 2.5V to 12V
Output Voltage Accuracy:
±1%
On-chip Thermal Shutdown
ESD: Human Body Model 3kV
Machine Model 600V
Operating Junction Temperature: -40
o
C to 125
o
C
Applications
·
·
·
·
·
Notebook
USB Device
Add-on Card
DVD Player
PC Motherboard
DFN-3×3-8
SOIC-8
Figure 1. Package Types of AP2318
Dec. 2010 Rev. 1. 5
1
BCD Semiconductor Manufacturing Limited
600mA LOW DROPOUT LINEAR REGULATOR
600mA ULDO REGULATOR WITH ENABLE
Pin Configuration
DN Package
(DFN-3x3-8)
M Package
(SOIC-8)
Data Sheet
AP1117M
AP2318
V
IN
1
V
IN
2
V
OUT
3
V
OUT
4
8
7
6
5
EN
NC
GND
ADJ/NC
NC
EN
V
IN
V
IN
1
2
3
4
8
7
6
5
GND
ADJ/NC
V
OUT
NC
Figure 2. Pin Configuration of AP2318 (Top View)
Functional Block Diagram
V
IN
1, 2 (3, 4)
EN
8 (2)
3, 4 (6)
V
OUT
Enable
RC
Compensation
OVP
5 (7)
ADJ/NC
Bandgap
Reference
V
FB
Error
Amplifier
Thermal
Shutdown
Current
Limit
A2
A1
B
6 (8)
GND
Connect A1 and A2, disconnect B: Fixed Voltage Version
Connect B, disconnect A1 and A2:Adjustable Voltage Version
A (B)
A: DFN-3
x
3-8
B: SOIC-8
Figure 3. Functional Block Diagram of AP2318
Dec. 2010 Rev. 1. 5
2
BCD Semiconductor Manufacturing Limited
600mA LOW DROPOUT LINEAR REGULATOR
600mA ULDO REGULATOR WITH ENABLE
Pin Description
Pin Number
DFN-3
×
3-8
1, 2
3, 4
5
6
7
8
SOIC-8
3, 4
6
7
8
1, 5
2
V
IN
V
OUT
ADJ/NC
GND
NC
EN
Input Voltage
Output Voltage
Adjust Voltage/No Connection
Ground
No connection
On/Off control
Pin Name
Function
Data Sheet
AP1117M
AP2318
Ordering Information
AP2318
Circuit Type
Package
M: SOIC-8
DN: DFN-3×3-8
-
E1: Lead Free
G1: Green
TR: Tape and Reel
Blank: Tube
ADJ: Adjustable Output
1.3: Fixed Output 1.3V
Package
Temperature
Range
Part Number
Marking ID
Lead Free
AP2318M-ADJE1
Green
AP2318M-ADJG1
AP2318M-ADJTRG1
AP2318M-1.3G1
AP2318M-1.3TRG1
AP2318DN-ADJTRG1
AP2318DN-1.3TRG1
Lead Free
2318M-ADJE1
2318M-ADJE1
2318M-1.3E1
2318M-1.3E1
F9E
F9B
Green
2318M-ADJG1
2318M-ADJG1
2318M-1.3G1
2318M-1.3G1
B9E
B9B
Packing
Type
Tube
Tape & Reel
Tube
Tape & Reel
Tape & Reel
Tape & Reel
SOIC-8
-40
to 125
o
C
AP2318M-ADJTRE1
AP2318M-1.3E1
AP2318M-1.3TRE1
DFN-3
×
3-8
-40 to 125 C
o
AP2318DN-ADJTRE1
AP2318DN-1.3TRE1
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.
Dec. 2010 Rev. 1. 5
3
BCD Semiconductor Manufacturing Limited
600mA LOW DROPOUT LINEAR REGULATOR
600mA ULDO REGULATOR WITH ENABLE
Absolute Maximum Ratings (Note 1)
Parameter
Input Voltage
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
Thermal Resistance (Note 2)
ESD (Human Body Model)
ESD (Machine Model)
Symbol
V
IN
T
J
T
STG
T
LEAD
θ
JA
ESD
ESD
SOIC-8
DFN-3×3-8
3000
600
Value
15
150
-65 to 150
260
135
120
Data Sheet
AP1117M
AP2318
Unit
V
o
C
o
C
o
C
o
C/W
V
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods
may affect device reliability.
Note 2: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifica-
tions do not apply when operating the device outside of its operating ratings. The maximum allowable power dissipation is a
function of the maximum junction temperature, T
J
(max)
,
the junction-to-ambient thermal resistance,θ
JA,
and the ambient tem-
perature, T
A.
The maximum allowable power dissipation at any ambient temperature is calculated using: P
D
(max)=(T
J
(max) -
T
A
)/θ
JA.
Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will
go into thermal shutdown.
Recommended Operating Conditions
Parameter
Input Voltage
Enable Voltage
Operating Junction Temperature Range
Symbol
V
IN
V
EN
T
J
-40
Min
2.5
Max
12
12
125
Unit
V
V
o
C
Dec. 2010 Rev. 1. 5
4
BCD Semiconductor Manufacturing Limited
600mA LOW DROPOUT LINEAR REGULATOR
600mA ULDO REGULATOR WITH ENABLE
Electrical Characteristics
Data Sheet
AP1117M
AP2318
Operating Conditions: 2.5V≤V
IN
≤12V,
C
IN
=1µF, C
OUT
=2.2µF, T
J
=25
o
C, unless otherwise specified. (P≤Maxi-
mum Power Dissipation). Limits appearing in
Boldface
type apply over the entire junction temperature range for
operation of -40
o
C to 125
o
C.
Parameter
Reference Voltage
Output Voltage
Maximum Output
Current
Line Regulation
Symbol
V
REF
V
OUT
Conditions
AP2318-ADJ I
OUT
=10mA, V
IN
-V
OUT
=2V, T
J
=25
o
C
10mA≤I
OUT
≤600mA,
V
OUT
+2V≤V
IN
≤12V
I
OUT
=10mA, V
IN
=2.5V, T
J
=25
o
C
10mA≤I
OUT
≤600mA,
2.5V≤V
IN
≤12V
Min
Typ
Max
Unit
V
V
A
0.2
6
0.4
10
%/V
mV
%
mV
V
1
5
µA
mA
µA
%
o
0.792 0.800 0.808
0.784 0.800 0.816
-1%
-2%
0.85
1.2
0.05
1
0.2
1
0.35
0.05
1.7
250
0.003
150
25
1%
2%
I
OUT
(max) V
IN
-V
OUT
=2V
V
RLINE
AP2318-ADJ
I
OUT
=10mA, V
OUT
+2V≤V
IN
≤12V
I
OUT
=10mA, 2.5V≤V
IN
≤12V
AP2318-ADJ
V
IN
=V
OUT
+2V, 10mA≤I
OUT
≤600mA
V
IN
=2.5V, 10mA≤I
OUT
≤600mA
∆V
OUT
(∆V
REF
)=1%, I
OUT
=600mA
Load Regulation
Dropout Voltage
Adjust Pin Current
Minimum Load
Current
Quiescent Current
RMS Output Noise
(% of V
OUT
)
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Enable Input Voltage
V
RLOAD
V
DROP
I
ADJ
I
LOAD
(min) V
OUT
+2V≤V
IN
≤12V
(ADJ only)
I
Q
V
NOI
V
IN
=V
OUT
+2V, I
OUT
=0mA
T
A
=25
o
C, 10Hz≤f≤20kHz
C
o
C
V
EN
I
EN
θ
JC
Enable logic low
Enable logic high
V
EN
=2.25V
V
EN
=0.8V
DFN-3
×
3-8
SOIC-8
15
24
2.25
5
0.8
V
µA
µA
o
Enable Input Current
Thermal Resistance,
(Junction to Case)
15
4
C/W
Dec. 2010 Rev. 1. 5
5
BCD Semiconductor Manufacturing Limited
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