PAM3103
300mA Adjustable High PSRR CMOS Linear Regulator
Features
n
Low Dropout Voltage: 180mV@ 300mA
( V
O
= 3.3V)
n
Accuracy within ±2%
n
Quiescent Current: 65 μ A Typ.
n
High PSRR: 67dB@100Hz
n
Excellent Line/Load Regulation
n
Fast Response
n
Current Limiting
n
Short Circuit Protection
n
Low Temperature Coefficient
n
Shutdown Current: 0.5 μ A
n
Thermal Shutdown
n
Space Saving Packages SOT2 3-5 and
SC70-5
n
Pb-Free Package
General Description
The PAM3103 is a positive, adjustable linear
regulator. It features low quiescent current (65 μ A
Typ.) and low dropout voltage, making it ideal for
battery powered applications. The output voltage
is adjustable from 1.2V through 5V. Its high PSRR
makes it useful in applications that require AC
noise suppression on the input power supply.
Space-saving SOT23-5 and SC70-5 packages
are attractive for portable and handheld
applications. It has both thermal shutdown and a
current limit features to prevent device failure
under extreme operating conditions. It is stable
with an output capacitor of 2.2 μ F or greater.
Applications
n
n
n
n
n
n
n
Cordless Phone
Cellular Phone
Bluetooth Earphone
Digital Camera
Portable Electronics
WLAN
M P 3 Player
Typical Application
IN
1
5
Block Diagram
VIN
OUT
VOUT
VIN
EN
GND
2
VOUT
PAM3103
3
ADJ 4
R1
C
C
100pF
OverCurrent
Shutdown
C
IN
1μF
R2
C
O
2.2 μ F
EN
Thermal
Protection
ADJ
Error Amp
V
O
=
V
REF
*
(
R1
+
R2
)
/R2
Reference
GND
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.2
1
PAM3103
300mA Adjustable High PSRR CMOS Linear Regulator
Pin Configuration & Marking Information
Top View
SOT23-5
5
4
5
4
Top View
SC70-5
ACVYW
1
1
2
3
ACVYW
2
3
AC:
V:
Y:
W:
Product Code of PAM3101
Voltage Code
Year
Week
Pin Number
1
2
3
4
5
Name
VIN
GND
EN
ADJ
VOUT
Function
Input
Ground
Chip Enable (Active High)
Adjustable Pin
Output
Absolute Maximum Ratings
These are stress ratings only and functional operation is not implied
.
Exposure to absolute
maximum ratings for prolonged time periods may affect device reliability
.
All voltages are with
respect to ground
.
Input Voltage ............................................... 6.6V
Output Current ......................................... 300mA
Output Pin Voltage ................ GND-0.3 to V
IN
+0.3V
Lead Soldering Temperature(5sec) ............ 300°C
Storage Temperature ....................- 65 °C to 150 °C
Recommended Operating Conditions
Max. Supply Voltage (for Max. duration of
30 minutes)................................................6.4V
Junction Temperature ..................- 40 °C to 125 °C
Ambient Temperature .....................- 40 °C to 85 °C
Thermal Information
Parameter
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient)
Internal Power Dissipation
Symbol
θ
JC
θ
JA
P
D
Package
SOT23-5
SC70-5
SOT23-5
SC70-5
SOT23-5
SC70-5
Maximum
130
TBD
250
300
400
300
Unit
°C/W
°C/W
mW
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.2
2
PAM3103
300mA Adjustable High PSRR CMOS Linear Regulator
Electrical Characteristic
PARAMETER
Input Voltage
Output Voltage
Reference Voltage
Output Voltage Accuracy
Output Current
Short Circuit Current
Dropout Voltage
Ground Current
Quiescent Current
Line Regulation
Load Regulation
Temperature Coefficient
Over Temperature
Shutdown
Over Temperature
Hysteresis
Power Supply Ripple
Rejection
Output Noise
EN Input High Threshold
EN Input Low Threshold
Shutdown Current
T
A
=
25 °C, V
IN
=
4V, V
O
=3V, C
IN
=
1 μ F, C
O
=
2.2 μ F, unless otherwise noted.
SYMBOL
V
IN
V
O
V
REF
V
O
I
O
I
SC
V
drop
I
GND
I
Q
LNR
LDR
Tc
OTS
OTH
I
O
=1mA
I
O
=1mA
f=100Hz
PSRR
Vn
V
IH
V
IL
I
SD
Io=100mA, Vo=1.2V
f =10Hz to 100kHz
V
IN
=2.5V to 5V
V
IN
=2.5V to 5V
V
EN
=0V
0.01
1.5
0.3
1
f=1kHz
f=10kHz
Vo=0V
I
O
=300mA
2.5V≤Vo<3.3V
Vo≥3.3V
I
O
=1mA
-2
300
150
370
180
70
65
-0.4
-1
0.2
0.2
40
150
30
67
65
42
50
450
230
90
90
0.4
1
μA
μA
%/V
%
ppm/ C
O
O
Test Conditions
MIN
Note 1
1.2
TYP
MAX
5.5
5
UNITS
V
V
V
%
mA
mA
mV
1.235
2
Note 2
I
O
=1mA to 300mA
I
O
=0mA
I
O
=1mA, V
IN
=3Vto 5V
I
O
=1mA to 300mA
C
C
O
dB
dB
dB
μVrms
V
V
μA
Note1: The minimum input voltage ( V
IN(MIN)
) of the PAM3103 is determined by output voltage and dropout
voltage. The minimum input voltage is defined as :
V
IN(MIN)
=V
O
+V
drop
Note 2: Output current is limited by P
D
, maximum I
O
=P
D
/( V
IN(MAX)
-V
O
).
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.2
3
PAM3103
300mA Adjustable High PSRR CMOS Linear Regulator
Typical Performance Characteristics
1. Output Voltage vs Input Voltage
T
A
=
25 °C, V
O
=1.2V, C
IN
=
1 μ F, C
O
=
2.2 μ F, unless otherwise noted.
2. Output Voltage vs Output Current
V
IN
=3V
1.25
1.2
1.205
1.2
Output Voltage (V)
Output Voltage(V)
1.15
1.1
1.05
1
0.95
0.9
0.85
0.8
2
3
4
Input Voltage(V)
5
6
I
O
=1mA
I
O
=150mA
I
O
=300mA
1.195
1.19
1.185
1.18
1.175
0
50
100
150
200
250
300
Output Current(mA)
V
IN
=4V
V
IN
=5V
3. Output Voltage vs Temperature
1.2
1.195
80
70
4. Quiescent Current vs Input Voltage
Output Voltage(V)
1.185
1.18
1.175
1.17
1.165
1.16
0
50
I
O
=30mA
Input Voltage(V)
1.19
60
50
40
30
20
10
0
2
3
4
5
Quiescent Current (μA)
6
I
O
=300mA
100
150
Temperature(℃)
82
Ground Current (μA)
5. Ground Current vs Temperature
Ground Current (μA)
120
100
80
60
6. Ground Current vs Input Voltage
I
O
=300mA
80
78
76
74
72
70
68
0
30
60
90
120
150
Temperature(℃)
I
O
=150mA
40
20
0
2
3
4
Input Voltage(V)
I
O
=1mA
5
6
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.2
4
PAM3103
300mA Adjustable High PSRR CMOS Linear Regulator
Typical Performance Characteristics
(continued)
7. Load Regulation Transient Response
8. Line Regulation Transient Response
Vo
AC
Coupling
V
IN
DC
Coupling
Io
DC
Coupling
Vo
AC
Coupling
I
O
=1mA to 100mA
+0
-10
Io=1mA,V
IN
=3V to 5V
9. Power Supply Ripple Rejection
Vo
AC
Coupling
d
B
-20
-30
-40
-50
I
O
=100mA
Io
DC
Coupling
I
O
=1mA
-60
-70
-80
10
20
50
100
200
500
1k
Hz
2k
5k
10k
20k
50k100k
I
O
=1mA to 300mA
V
IN
=3V,Vpp=1V
Vo
AC
Coupling
Io
DC
Coupling
I
O
=100mA to 300mA
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.2
5
