1.5A Low Voltage-Low Dropout CMOS Regulator
Key Features
n
Low-Dropout Regulator Supports Input
Voltages Down to 1.4V
n
Output Voltage Available in 0.9V, 1.0V,
1.2V, 1.5V, 1.8V, 2.5V,2.8V,2.85V,3.0V, 3.3V
n
Stable with a Ceramic Output Capacitor
of 1.0uF or Higher
n
Low Dropout Voltage:150mV @1.5A
n
Low Quiescent Current
n
Over Temperature Shutdown
n
Short Circuit Protection
n
Low Temperature Coefficient
n
Standard SOT-223,TO-252 and SOP-8
(Exposed Pad) Packages
n
Pb-Free Package
PAM3115
General Description
The PAM3115 is a 1.5A CMOS LDO regulator that
features a low quiescent current, ultra low input,
output and dropout voltages, as well as over
temperature shutdown. It is available in SOT-223 ,
TO-252 and SOP-8(exposed pad) packages. The
fixed output voltage of the PAM3115 is set at the
factory and trimmed to ± 2%. The PAM3115 is
stable with a ceramic output capacitor of 1.0uF
or higher.
This family of regulators can provide either a
stand-alone power supply solution or act as a post
regulator for switch mode power supplies. They
are particularly well suited for applications
requiring low input and output voltages.
Applications
n
DSP, FPGA, and Microprocessor Power
Supplies
n
1.2V Core Voltage for DSPs
n
SATA Power Supply
n
LCD TV/ Monitors
n
Wireless Devices
n
Communication Devices
n
Portable Electronics
n
Post Regulator for SMPS
Typical Application
R
P
10K
V
IN
VIN
VOUT
V
O
PAM3115
C
IN
4.7uF
GND
IN
C
O
2.2uF
VIN
EN
C1
4.7uF
GND
PAM3115
PWRGD
VOUT
OUT
C2
2.2uF
SENSE
Power Analog Microelectronics
,
Inc
www.poweranalog.com
08/2007
1
1.5A Low Voltage-Low Dropout CMOS Regulator
Block Diagram
IN
OUT
IN
OUT
PAM3115
OverCurrent
Shutdown
Thermal
Shutdown
OverCurrent
Shutdown
Thermal
Shutdown
EN
R1
AMP
AMP
R1
R2
R2
GND
GND
Pin Configuration & Marking Information
Top View
SOP-8(EPD)
8
7
6
5
P3115 V
F AT Y W
V: Voltage Code
F: Internal Code
A: Assembly Code
T: Testing Code
Y: Year
W: Weekly
1
2
3
4
Name
GND
VIN
EN
GND
PWRGD
SENSE
VOUT
GND
Function
Ground
Input
Enable Pin
Ground
Power Good
Sense
Output
Ground
Pin Number
1
2
3
4
5
6
7
8
Power Analog Microelectronics
,
Inc
www.poweranalog.com
08/2007
2
1.5A Low Voltage-Low Dropout CMOS Regulator
Pin Configuration & Marking Information
(continued)
Top View
SOT-223
Top View
TO-252
PAM3115
P3115 V
F AT Y W
P3115 V
F AT Y W
V: Voltage Code
F: Internal Code
A: Assembly Code
T: Testing Code
Y: Year
W: Weekly
1
2
3
Name
VIN
GND
VOUT
1
2
3
Pin Number
1
2
3
Function
Input
Ground
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...............................................4.0V
Output Pin Voltage.....................-0.3V to V
IN
+0.3V
Operation Temperature Range........... -40
℃
to 85
℃
Operation Junction Temperature...... -40
℃
to 125
℃
Maximum Output Current......................P
D
/(V
IN
-V
O
)
Storage Temperature..................... -65
℃
to 150
℃
Maximum Junction Temperature..................150
℃
Soldering Temperature.......................300
℃
, 5sec
Recommended Operating Conditions
Supply Voltage Range.......................1.4V to 3.6V
Operation Temperature Range...........-40
℃
to 85
℃
Junction Temperature Range.......... -40
℃
to 125
℃
Thermal Information
Parameter
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Symbol
θ
JC
θ
JA
P
D
Package
SOT-223
TO-252
SOT-223
TO-252
SOT-223
TO-252
Maximum
7
7
160
90
625
1200
Unit
℃/W
mW
Power Analog Microelectronics
,
Inc
www.poweranalog.com
08/2007
3
1.5A Low Voltage-Low Dropout CMOS Regulator
Electrical Characteristic
V
IN
= V
O
+0.5V, T
A
=25
O
C, C
IN
=4.7uF, C
O
=2.2uF, unless otherwise noted.
Parameters
Input Voltage Range
Output Voltage Accuracy
Symbol
V
IN
V
O
I
O
=100mA
Vo=0.9V
I
O
=500mA
Dropout Voltage
V
DROP
I
O
=1.5A
Vo=1.0V
2.5V>Vo≥1.2V
Vo≥2.5V
Vo=0.9V
Vo=1.0V
2.5V>Vo≥1.2V
Vo≥2.5V
Short Circuit Current
Quiescent Current
Ground Pin Current
I
SC
I
Q
I
GND
Vo < 0.3V
Io=0mA
Io=1mA to 1.5A
V
O
≤2.5V,Io=10mA
Line Regulation
LNR
V
IN
=Vo+0.5V to Vo+1.5V
V
O
>2.5V,I
O
=10mA
V
IN
=3.3V to 3.6V
Load Regulation
Over Temperature Shutdown
Over Temperature Hysteresis
Temperature Coefficient
Power Supply Ripple
Rejection
Output Noise
LDR
OTS
OTH
TC
PSRR
Vn
I
O
=100mA,
V
O
=1.5V
f=100Hz
f=1KHz
f=10KHz
I
O
=1mA to 1.5A
0.5
150
50
40
55
55
35
40
uVrms
dB
2
%/A
℃
℃
ppm/℃
0.5
1
%/V
Test Conditions
MIN
Note 1
-2
330
220
50
40
330
220
150
120
1.0
90
150
600
TYP
MAX
3.6
2
500
400
200
150
500
400
350
300
A
uA
uA
mV
UNITS
V
%
PAM3115
f=10Hz to 100kHz
Note1: The minimum input voltage (V
IN(MIN)
) of the PAM3115 is determined by output voltage and dropout
voltage. The minimum input voltage is defined as:
V
IN(MIN)
=V
O
+V
drop
Power Analog Microelectronics
,
Inc
www.poweranalog.com
08/2007
4
1.5A Low Voltage-Low Dropout CMOS Regulator
Typical Performance Characteristics
T
A
=25°C,C
IN
=4.7uA,Co=2.2uF,unless otherwise noted.
1. Output Voltage vs Input Voltage
1
0.9
PAM3115
Vo
=
0
.
9V
1
0.9
Vo=0.9V
Output Voltage(V)
0.8
0.7
0.6
0.5
0.4
0.3
0.8
1.2
1.6
2
2.4
Io=1.5A
Io=500mA
Output Voltage(V)
Io=10mA
0.8
0.7
0.6
0.5
0.4
0.3
Io=10mA,T
A
=85
Io=10mA,T
A
=25℃
2.8
3.2
3.6
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
Input Voltage(V)
Input Voltage(V)
Vo=1.5V
1.7
1.5
Io=10mA
1.7
1.5
Vo=1.5V
Output Voltage(V)
1.3
1.1
0.9
0.7
0.5
0.3
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
Input Voltage(V)
Io=1.5A
Io=500mA
Output Voltage(V)
1.3
1.1
0.9
0.7
0.5
0.3
0.8
1.2
1.6
Io=10mA,T
A
=25
℃
Io=10mA,T
A
=85℃
2
2.4
2.8
3.2
3.6
Input Voltage(V)
3
2.5
Vo=2.5V
3
2.5
Vo=2.5V
Output Voltage(V)
Output Voltage(V)
Io=10mA
2
1.5
Io=500mA
1
0.5
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
Input Voltage(V)
Io=1.5A
2
1.5
1
0.5
0.8
1.2
1.6
2
Io=10mA,T
A
=25
℃
Io=10mA,T
A
=85℃
2.4
2.8
3.2
3.6
Input Voltage(V)
Power Analog Microelectronics
,
Inc
www.poweranalog.com
08/2007
5
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