PAM3101
300mA High PSRR Low Dropout CMOS Linear Regulator
Features
n
Low Dropout Voltage: 180mV@300mA
(V
O
=3.3V)
n
Output Voltage Accuracy within ±2%
n
Quiescent Current
:
65 μ A Typ.
n
High PSRR: 70dB@1kHz
n
Excellent Line and 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 Package: SOT-23 , SOT-89
and SC70
n
Pb-Free Package
General Description
The PAM3101 series of positive voltage linear
regulators feature low quiescent current (65 μ A
Typ.) and low dropout voltage, making them ideal
for battery powered applications. Their high
PSRR make them useful in applications where
AC noise on the input power supply must be
suppressed. Space-saving SOT-23, SOT-89 and
SC70 packages are attractive for portable and
handheld applications. They have both thermal
shutdown and current limit features to prevent
device failure from extreme operating conditions.
They are stable with an output capacitor of 2.2 μ F
or greater.
Applications
n
n
n
n
n
n
n
Cordless Phones
Cellular Phones
Bluetooth Earphones
Digital Cameras
Portable Electronics
WLANs
MP3 Players
Typical Application
IN
Block Diagram
OUT
VIN
VOUT
PAM3101
EN
C
IN
1μF
VIN
VOUT
GND
BYP
C
BYP
10nF
C
O
2.2 μ F
OverCurrent
Shutdown
EN
BYP
IN
Thermal
Protection
Amp
GND
VIN
VOUT
PAM3101
GND
C
IN
1μF
OUT
Bandgap
C
O
2.2 μ F
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.4
1
PAM3101
300mA High PSRR Low Dropout CMOS Linear Regulator
Pin Configuration & Marking Information
Top View
SOT23-3
3
Top View
SOT23-5
5
4
AAVYW
AAVYW
1
2
1
2
3
Top View
SOT89-3
5
Top View
SOT89-5
4
AA: Product Code of PAM3101
V: Voltage Code
X: Internal Code
Y: Year
W: Week
P3101V
XXXYW
P3101V
XXXYW
1
2
3
1
2
3
Top View
SC70-3L
3
Top View
SC70-4L
Top View
SC70-5L
4
3
5
4
AAVYW
1
2
AAVYW
1
2
1
AAVYW
2
3
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.4
2
PAM3101
300mA High PSRR Low Dropout CMOS Linear Regulator
Pin Configuration Available
Pin
1
GND
SOT23-3
VIN
VOUT
SOT89-3
SOT23-5
SOT89-5
SC70-3L
SC70-4L
SC70-5L
GND
VOUT
VIN
VOUT
VIN
EN
VIN
2
VOUT
VOUT
GND
VIN
GND
GND
GND
VOUT
GND
GND
3
VIN
GND
VIN
VOUT
VIN
EN
NC
GND
VOUT
EN
VIN
BYP
VOUT
BYP
EN
VOUT
VIN
4
5
Pin Descriptions
Name
VIN
GND
VOUT
EN
BYP
NC
Input
Ground
Output
Chip Enable (active high)
Bypass Pin, need a 10nF capacitor connect to GND
No Connection
Function
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.4
3
PAM3101
300mA High PSRR Low Dropout CMOS Linear Regulator
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-0.3V to V
IN
+0.3V
Lead Soldering Temperature (5sec)....... .... 300
°
C
Storage Temperature .................- 65
°
C to 150
°
C
ESD Rating ............................................ Class B
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)
Symbol
θ
JC
Package
SOT-23
SOT-89
SC70
SOT-23
Thermal Resistance (Junction to Ambient)
θ
JA
SOT-89
SC70
SOT-23
Internal Power Dissipation
P
D
SOT-89
SC70
Maximum
130
100
TBD
250
180
300
400
550
300
mW
°C/W
°C/W
Unit
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.4
4
PAM3101
300mA High PSRR Low Dropout CMOS Linear Regulator
Electrical Characteristic
V
IN
=
V
O
+1V, T
A
=
25
°
C
,
C
IN
=
1 μ F, C
O
=
2.2 μ F, unless otherwise noted
PARAMETER
Input Voltage
Output Voltage Accuracy
Output Current
SYMBOL Test Conditions
V
IN
Vo
I
O
Vo=1.5V
Dropout Voltage
V
drop
Io =300mA
Vo=1.8V
2.5V£Vo<3.3V
Vo³3.3V
Ground Current
Quiescent Current
I
GND
I
Q
Io=1mA to 300mA
Io=0mA
Io=1mA, Vo<2V,
V
IN
= 2.8V to 3.8V
Line Regulation
LNR
Io=1mA, 2V£Vo<3.3V,
V
IN
= Vo+0.5V to Vo+1V
Io=1mA, Vo³3.3V,
V
IN
=Vo+0.5V to Vo+1V
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
LDR
Tc
OTS
OTH
PSRR
Vn
V
IH
V
IL
I
SD
Io=1mA to 300mA, Vo³2V
Io=1mA to 300mA, Vo<2V
Io=1mA
Io=1mA
Io=1mA
Io=100mA
C
BYP
=10nF
Vo=3.3V
V
IN
=2.5V to 5V
V
IN
=2.5V to 5V
V
EN
=0V
0.01
f=100Hz
f=1kHz
-0.15
-0.1
-0.4
-2
Io=1mA
MIN
Note 1
-2
300
1150
850
370
180
70
65
0.1
0.03
0.2
1
30
40
150
30
70
65
50
1.5
0.3
1
dB
μVrms
V
V
μA
TYP
MAX
5.5
2
Note 2
1400
1100
450
230
90
90
0.15
0.1
0.4
2
60
%
mV
ppm/ C
O
O
O
UNITS
V
%
mA
mV
μA
μA
%/V
C
C
f =10Hz to 100kHz, C
BYP
=10nF
Note1: The minimum input voltage ( V
IN(MIN)
) of the PAM3101 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 1.4
5
