AMC7637
www.addmtek.com
DESCRIPTION
The AMC7637 is an ultra low quiescent current, and
low dropout regulator rated for 300mA output current. The
low power consumption and high accuracy is achieved
through CMOS technology and internal trimmed reference
voltage.
The AMC7637 consists of a high-precision voltage
reference, error correction circuit, and a current limit output
driver. The fast transient response is an outstanding feature
for applications with various loads.
TYPICAL APPLICATION
V
IN
V
OUT
U
LTRA
L
OW
I
Q
300mA L
OW
D
ROP
O
UT
R
EGULATOR
FEATURES
Ultra low quiescent current of 15µA in typical.
Typical 2% internally trimmed output.
Output current is excess of 300mA.
Low Dropout Voltage.
P-MOS output stage with low R
DS(ON)
.
Short circuit protection.
Internal thermal overload protection.
Available in 3-Lead surface mount SOT-23
package.
APPLICATIONS
AMC7637
C
IN
1µF
C
OUT
2.2µF
Digital Camera
Battery Powered Applications
PDA
Smart Phones
VOLTAGE OPTIONS
AMC7637-1.5
AMC7637-1.8
AMC7637-2.5
AMC7637-3.0
AMC7637-3.3
1.5V Fixed
1.8V Fixed
2.5V Fixed
3.0V Fixed
3.3V Fixed
PACKAGE PIN OUT
V
OUT
V
IN
GND
3-Pin Plastic SOT-23
Surface Mount
ORDER INFORMATION
T
A
(
°
C )
-40 to +85
DB
SOT-23
3-pin
AMC7637-X.XDBF (Lead Free)
Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC7637-X.XDBFT).
Note: 2. The letter ”F” is marked for Lead Free process.
Copyright
©
2008 ADDtek Corp.
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AMC7637
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
IN
Maximum Operating Junction Temperature, T
J
Storage Temperature Range
Lead Temperature (soldering, 10 seconds)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
(Note)
8V
150°C
-65°C to 150°C
260°C
THERMAL DATA
Thermal Resistance from Junction to Ambient,
θ
JA
Thermal Resistance from Junction to Case,
θ
JC
Junction Temperature Calculation: T
J
= T
A
+ (P
D
× θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
Connect the ground pin to ground using a large pad or ground plane for better heat dissipation.
All of the above assume no ambient airflow.
Maximum Power Calculation:
T
– T
A(MAX)
P
D(MAX)
=
J(MAX)
θ
JA
O
T
J
( C):
Maximum recommended junction temperature
T
A
(
O
C):
θ
JA
( C /W):
O
250°C /W
140°C /W
Ambient temperature of the application
Junction-to-Ambient temperature thermal resistance of the package, and other heat dissipating materials.
The maximum power dissipation for a single-output regulator is:
P
D(MAX)
=
[(V
IN(MAX)
- V
OUT(NOM)
)]
×
I
OUT(NOM)
+ V
IN(MAX)
×
I
Q
Where:
V
OUT(NOM)
= the nominal output voltage
I
OUT(NOM)
= the nominal output current, and
I
Q
= the quiescent current the regulator consumes at I
OUT(MAX)
V
IN(MAX)
= the maximum input voltage
θ
JA
= (125
O
C – T
A
)/P
D
Then
BLOCK DIAGRAM
V
IN
Current
Limiter
V
OUT
V
REF
GND
Copyright
©
2008 ADDtek Corp.
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AMC7637
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Voltage
Load Current (with adequate heat sinking)
Input Capacitor (V
IN
to GND)
Output Capacitor with ESR of 10Ω max. (V
OUT
to GND)
Operating ambient temperature range
Operating junction temperature
Note : V
IN(MIN)
= V
OUT
+ V
DROP
Symbol
V
IN
I
O
Min.
NOTE
Typ.
Max.
7
300
Units
V
mA
µF
µF
°C
°C
5
0.1
1.0
T
A
T
J
-40
85
125
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
IN
= V
O(TYP)
+
1V, I
O
= 10mA, C
OUT
= 2.2µF, T
A
=25
O
C, and are for DC characteristics only. (Low duty cycle pulse
testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Symbol
V
O
∆V
OI
∆V
OL
I
O
= 10mA
Conditions
V
IN
= (V
O
+
0.5V) to 8V
10mA
≤
I
O
≤100mA
10mA
≤
I
O
≤
300mA
V
O(NOM)
≦2.0V
I
O
= 100mA
V
O
=V
O(NOM)
-2.0% 2.0V＜V
O(NOM)
Min
-2
Typ
Max
+2
Units
%
%/V
mV
0.1
15
45
0.3
30
80
300
200
1300
600
500
Dropout Voltage
V
DROP
1.3V≦V
O(NOM)
≦2.0V
I
O
= 300mA
2.0V＜V
O(NOM)
≦2.8V
V
O
=V
O(NOM)
-2.0%
2.8＜V
O(NOM)
mV
Ground Pin Current
Current Limit
Output Voltage
Temperature Coefficient
I
Q
I
CL
I
O
= 10mA~300mA
V
IN
= V
OUT
+ 0.5V
I
O
=100mA, -40
°
C
≤
T
J
≤
125
°
C
350
15
30
µA
mA
±100
ppm/°C
Copyright
©
2008 ADDtek Corp.
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AMC7637
CHARACTERIZATION CURVES
V
IN
= 5V，C
IN
=1µF，C
OUT
= 2.2µF，T
A
=25°C unless otherwise specified.
Load Regulation vs. Load Current
50
50
Load Regulation vs. Load Current
AMC7637-3.3
Load Regulation (mV)
40
30
20
10
0
AMC7637-2.5V
Load Regulation (mV)
40
30
20
10
0
100
150
200
250
300
350
100
150
200
250
300
350
Load Current (mA)
Load Current (mA)
Output Voltage vs. Supply Voltage
2.60
2.58
Output Voltage (V)
2.55
2.53
2.50
2.48
2.45
2.43
2.40
3.5
4.5
5.5
6.5
7.5
3.40
Output Voltage vs. Supply Voltage
3.38
Output Voltage (V)
3.35
3.33
3.30
3.28
3.25
3.23
3.20
3.5
4.5
5.5
6.5
7.5
AMC7637-2.5V
AMC7637-3.3V
Supply Voltage (V)
Supply Voltage (V)
Ground Current vs. Load Current
30
Ground Current vs. Load Current
30
AMC7637-2.5V
Ground Current (uA)
AMC7637-3.3V
25
Ground Current (uA)
20
15
10
5
0
25
20
15
10
5
0
0
100
200
300
400
500
0
100
200
300
400
500
Load Current (mA)
Load Current (mA)
Copyright
©
2008 ADDtek Corp.
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AMC7637
Dropout Voltage vs. Output Voltage
800
700
Dropout Voltage (mV)
600
500
400
300
200
100
0
1.5
1.8
2.5
3.3
Output Voltage (V)
Dropout Voltage (mV)
800
700
Dropout Voltage vs. Load Curent
V
OUT
=1.8V
V
OUT
=1.5V
Io=300mA
Io=200mA
Io=100mA
600
500
400
300
200
100
0
0
50
100
V
OUT
=2.5V
V
OUT
=3.3V
150
200
250
300
Load Current
Output Voltage vs. Tem perature
3.40
3.35
Output Voltage (V)
3.30
3.25
3.20
3.15
3.10
-40
-20
0
20
40
60
80
100 120 140 160
AMC7637-3.3V
V
IN
=5V
I
O
=100m A
I
O
=300m A
Temperature (
°
C)
Load Transient Response
V
IN
=5V, C
IN
=1uF, C
OUT
=2.2uF,T
A
=25℃
Load Transient Response
V
IN
=5V, C
IN
=1uF, C
OUT
=2.2uF,T
A
=25℃
V
O
(100mV/DIV)
V
O
(100mV/DIV)
I
O
(200mA/DIV)
AMC7637-2.5
AMC7637-3.3
I
O
= 10mA - 300mA
I
O
(200mA/DIV)
I
O
= 10mA - 300mA
SR=2mA/us
TIME= 200 us/DIV
SR=2mA/us
TIME= 200 us/DIV
Copyright
©
2008 ADDtek Corp.
5
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