AMC DOC. #:AMC8878_A (LF)
Jun 2004
®
A
DD MICROTECH CORP.
DESCRIPTION
AMC8877
L
OW
N
OISE
300mA
L
OW
D
ROP
O
UT
R
EGULATOR
FEATURES
The AMC8877 product is a low noise, low dropout
linear regulator operating from 2.5V to 6.5V input.
An external capacitor can be connected to the
bypass pin to lower the output noise level to
30µV
RMS
.
Designed with a P-channel MOSFET output
transistor, the AMC8877 consume a low supply
current, independent of the load current and
dropout voltage. The internal thermal shut down
circuit will limits the junction temperature to
below 150°C. Other features include thermal
protection, reverse battery protection and output
current limit. The AMC8877 come in a miniature
5-pin SOT-23 package.
APPLICATIONS
Low output noise: 30µV
RMS
Industry standard’2982 pin assignment
(AMC8877)
Output voltage precision of
±1.4%
accuracy
Very low dropout voltage: 50mV/50mA,
165mV/150mA & 450mV/300mA
On/Off control
Low I
Q
: 1.6µA
Short circuit protection
Internal thermal overload protection
Available in surface mount 5-pin SOT-23 package.
Enhanced pin-to-pin Compatible to the MAX8878
(AMC8877).
PACKAGE PIN OUT
V
IN
1
5
Cellular Telephones
Battery Powered Systems
Hand-Held Instruments
Pagers
Personal Data Assistance (PDA)
PCMCIA Cards
V
OUT
GND
2
SHDN
3
4
BP
AMC8877
5-Pin Plastic SOT-23
Surface Mount
(Top View)
ORDER INFORMATION
Plastic SOT-23
5-pin
O
O
0 C
≤
T
A
≤
70 C
AMC8877-X.XDBT
0
O
C
≤
T
A
≤
70
O
C
AMC8877-X.XDBTF(Lead Free)
Temperature
Range
DBT
EXPANDED ORDER INFORMATION
Device Name
AMC887ڤ-1.8DBT
AMC887ڤ-2.0DBT
AMC887ڤ-2.5DBT
AMC887ڤ-2.8DBT
AMC887ڤ-2.85DBT
AMC887ڤ-3.0DBT
AMC887ڤ-3.2DBT
AMC887ڤ-3.3DBT
AMC887ڤ-5.0DBT
Output Voltage
1.8V
2.0V
2.5V
2.8V
2.85V
3.0V
3.2V
3.3V
5.0V
1
Symbolization
AMC8877
CG18
CG20
CG25
CG28
CG2U
CG30
CG32
CG33
CG50
www.addmtek.com
Copyright
©
2002, ADD Microtech Corp.
AMC DOC. #: AMC8877_A (LF)
Jun 2004
AMC8877
L
OW
N
OISE
300mA
L
OW
D
ROP
O
UT
R
EGULATOR
TYPICAL APPLICATION
V
IN
2.5V to 6V
V
OUT
C
IN
1µF
AMC8877
C
OUT
1µF
ON
OFF
C
BP
0.01µF
ABSOLUTE MAXIMUM RATINGS
(Note)
12V
Input Voltage, V
IN
150
O
C
Operating Junction Temperature, T
J
Storage Temperature Range
-65
O
C to +150
O
C
Lead Temperature (soldering, 10 seconds)
+260
O
C
Power Dissipation, P
D
@ T
A
= 70
O
C
150 mW
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.
THERMAL DATA
DB PACKAGE:
Thermal Resistance from Junction to Ambient,
θ
JA
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): Ambient temperature of the application
θ
JA
(
O
C /W): Junction-to-junction 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
Then
θ
JA
= (+150
O
C – T
A
)/P
D
220
O
C /W
Copyright
©
2002, ADD Microtech Corp.
2
www.addmtek.com
AMC DOC. #: AMC8877_A (LF)
Jun 2004
AMC8877
L
OW
N
OISE
300mA
L
OW
D
ROP
O
UT
R
EGULATOR
BLOCK DIAGRAM
V
IN
Reverse
Battery
Protection
SHDN
Shutdown
And
Power-On
Control
Current
Limit
V
OUT
Thermal
Sensor
V
REF
GND
BP
PIN DESCRIPTION
Pin Number
AMC8878 AMC8879
1
5
2
2
3
4
5
1
3
4
Pin Name
V
IN
GND
SHDN
BP
V
OUT
Pin Function
Input
Ground
Logic control shutdown pin; HI: Device is ON, LO: Device is OFF
Noise bypass pin; The output noise level can be reduced to 30µV
RMS
by
connecting external capacitors
Output
Copyright
©
2002, ADD Microtech Corp.
3
www.addmtek.com
AMC DOC. #: AMC8877_A (LF)
Jun 2004
AMC8877
L
OW
N
OISE
300mA
L
OW
D
ROP
O
UT
R
EGULATOR
Units
V
mA
µF
µF
RECOMMENDED OPERATING CONDITIONS
Recommended Operating Conditions
Parameter
Symbol
Min.
Typ.
Max.
Input Voltage
V
IN
2.5
6.5
Load Current
I
O
5
300
Input Capacitor (V
IN
to GND)
1.0
Output Capacitor with ESR of 10Ω max., (V
OUT
to GND)
1.0
Note:
1. C
IN
: A 1.0
µF
capacitor (or larger) should be placed between V
IN
to GND.
2. C
OUT
: A 1.0
µF
(or larger) capacitor is recommended between V
OUT
and GND for stability and improving the regulator’s transient response. The
ESR (Effective Series Resistance.) of this capacitor has no effect on regulator stability, but low ESR capacitors improve high frequency transient
response. The value of this capacitor may be increased without limit, but values larger than 10uF tend to increase the settling time after a step
change in input voltage or output current. The part may oscillate without the capacitor. Any type of capacitor can be used, but not Aluminum
electrolytics when operating below -25
O
C, The capacitance may be increased without limit.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperature of 0°C to +70
°C
with
V
IN
= V
OUT(NOMIAL)
+ 0.5V, 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
Maximum Output Current
Current Limit
Ground Pin Current
Symbol
∆V
OUT
I
OUT
I
LIMIT
I
Q
V
DROP
∆V
OI
∆V
OL
PSRR
e
n
I
OUT
= 10mA
I
OUT
= 300mA
I
OUT
= 50mA
I
OUT
= 150mA
I
OUT
= 300mA
V
IN
= (V
OUT
+
0.1V) to 6.5V, I
OUT
= 1mA -0.15
I
OUT
= 10 to 300mA, C
OUT
= 10µF
f=100Hz, I
L
=100uA
f = 10Hz - 100KHz,
C
BP
= 0.01µF
V
IN
= 2.5V to 5.5V
V
IN
= 2.5V to 5.5V
V
OUT
= 0V
V
SHDN
= V
IN
T
A
= +25 C
T
A
= +85
O
C
T
A
= +25
O
C
T
A
= +85
O
C
T
A
= +25
O
C
T
A
= +85
O
C
O
Test Conditions
I
OUT
= 10mA, T
A
= +25
O
C
I
OUT
= 10 to 300mA
AMC8877
Min
-1.4
-3
330
Typ.
Max
+1.4
+2
Units
%
mA
mA
300
1.6
1.7
50
165
450
0
40
50
30
20
9
9
120
300
650
0.15
80
µA
Dropout Voltage
Line Regulation
Load Regulation
Ripple Rejection
Output Voltage Noise
mV
%/V
mV
dB
µV
RMS
V
V
µA
nA
C
OUT
= 10µF
C
OUT
= 100µF
2.0
Shutdown Input Threshold High
Shutdown Input Threshold Low
Shutdown Supply Current
Shutdown Input Bias Current
V
SIH
V
SIL
I
Q(SHDN)
I
SHDN
0.01
0.2
0.01
0.5
6
6
+150
0.4
1
100
Shutdown Exit Delay
Thermal Shutdown Temperature
t
delay
T
SHDN
C
BP
= 0.1µF,
C
OUT
= 1µF, No load
ms
O
C
Note:
1. Current limit is measured at constant junction temperature, using pulse ON time.
2. Dropout is measured at constant junction temperature, using pulse ON time, and criterion is V
OUT
inside target value
±
2 %.
3. Regulation is measured at constant junction temperature, using pulsed ON time.
Copyright
©
2002, ADD Microtech Corp.
4
www.addmtek.com
AMC DOC. #: AMC8877_A (LF)
Jun 2004
AMC8877
L
OW
N
OISE
300mA
L
OW
D
ROP
O
UT
R
EGULATOR
Characterization Curves
V
IN
=V
OUT(NOMINAL)
+ 0.5V or 2.5V(whichever is greater), C
IN
=1uF, C
OUT
=1uF,C
BP
=0.01uF, T
A
=+25
O
C, ,Using plused ON time,unless otherwise noted.
Output Voltage v.s. Output Current
3.5
Quiescent Current v.s. Output Current
2
Output Voltage(V)
3.4
Quiescent Current (µA)
V
OUT
=3.3V
3.3
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
3.2
3.1
3
2.9
2.8
0
20
40
60
80
100
120
140
0
25
50
75
100
125
150
Output Current (V)
Output Current (mA)
Output Voltage v.s. Input Voltage
3.5
Quiescent Current v.s. Input Voltage
2.4
Output Voltage (V)
3.4
Quiescent Current (µA)
I
O
=10mA
V
OUT
=3.3V
2.2
2
1.8
1.6
1.4
1.2
3.3
I
O
=150mA
3.2
I
O
=150mA
3.1
3
4
4.5
5
5.5
6
I
O
=10mA
4
4.5
5
5.5
6
Input Voltage (V)
1
Input Voltage (V)
Output Voltage v.s. Temperature
3.48
3.44
3.4
3.36
3.32
3.28
3.24
3.2
25
45
65
85
105
Quiescent Current v.s. Temperature
2.4
Quiescent Current (µA)
V
OUT
=3.3V
2.2
2
1.8
1.6
1.4
1.2
1
25
45
65
85
105
Output Voltage (V)
I
O
=10mA
I
O
=150mA
Temperature ( C)
O
Temperature (
O
C)
Copyright
©
2002, ADD Microtech Corp.
5
www.addmtek.com
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