PAM PAM3105GNDCA120

PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Key Features
General Description
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 :50mV@ 0.5A
n Low Quiescent Current
n Over Temperature Shutdown
n Low Temperature Coefficient
n Pb-Free Package
The PAM3105 is a 0.5A 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 a SOT-89
package. The fixed output voltage of the
PAM3105 is set at the factory and trimmed to
± 2.0%. The device 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 LCD TV/ Monitors
n Wireless Devices
n Communication Devices
n Portable Electronics
n Post Regulator for SMPS
Block Diagram
Typical Application
VIN
VOUT
VIN
VOUT
VIN
VOUT
PAM3105
C IN
4.7uF
GND
CO
2.2uF
Thermal
Shutdown
R1
AMP
R2
GND
Power Analog Microelectronics , Inc
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08/2007
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Pin Configuration & Marking Information
Top View
SOT-89-3
V: Voltage Code
X: Internal Code
A: Assembly Code
T: Testing Code
Y:Year
W: Weekly
P3105 V
XAT Y W
1
2
3
Pin Number
1
2
3
Name
GND
VIN
VOUT
Function
Ground
Input
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 .
Storage Temperature..................... -65℃ to 150℃
Maximum Junction Temperature..................150℃
Soldering Temperature.......................300℃, 5sec
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℃
Recommended Operating Conditions
Junction Temperature Range.......... -40℃ to 125℃
Supply Voltage Range.......................1.4V to 3.6V
Operation Temperature Range...........-40℃ to 85℃
Thermal Information
Parameter
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Symbol
Package
Maximum
θJC
SOT-89-3
50
Unit
℃/W
θJA
SOT-89-3
180
PD
SOT-89-3
550
mW
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Electrical Characteristic
V IN = V O+0.5V, T A=25 OC, C IN =4.7uF, C O=2.2uF, unless otherwise noted.
Parameters
Input Voltage Range
Output Voltage
Accuracy
Symbol
Test Conditions
VIN
Vo
Io=50mA
Ground Pin Current
IGND
UNITS
Note 1
3.6
V
-2
2
%
450
Vo=1.0V
220
350
2.5V>Vo≥1.2V
20
150
Vo≥2.5V
10
100
Vo=0.9V
330
500
Vo=1.0V
220
400
2.5V>Vo≥1.2V
50
200
Vo≥2.5V
40
150
Io=0mA
90
150
uA
Io=1mA to 500mA
95
300
uA
0.1
1
%/V
0.2
1.5
%
IO=500mA
IQ
MAX
330
VDROP
Quiescent Current
TYP
Vo=0.9V
IO=100mA
Dropout Voltage
MIN
mV
Vo≤2.5V,Io=10mA
Line Regulation
LNR
VIN =Vo+0.5V to Vo+1.5V
Vo>2.5V,Io=10mA
VIN =3.3V to 3.6V
Load Regulation
Over Temperature
Shutdown
Over Temperature
Hysteresis
Temperature Coefficient
Power Supply Ripple
Rejection
Output Noise
LDR
Io=1mA to 500mA, VIN =Vo+0.5V
OTS
150
℃
OTH
50
℃
TC
40
ppm/℃
f=100Hz
PSRR
Io=100mA, Vo=0.9V f=1KHz
f=10KHz
Vn
f=10Hz to 100kHz
65
60
dB
40
40
uVrms
Note1: The minimum input voltage (V IN(MIN)) of the PAM3105 is determined by output voltage and dropout
voltage. The minimum input voltage is defined as:
V IN(MIN)=V O+V drop
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Typical Performance Characteristics
T A=25 OC, C IN =4.7uF, C O=2.2uF, unless otherwise noted.
1. Output Voltage vs Input Voltage
Vo=0.9V
0.95
2. Output Voltage vs Output Current
Vo=0.9V
0.95
0.9
Output Voltage(V)
Output Voltage(V)
0.85
0.8
0.75
0.7
Io=1mA
0.65
0.6
Io=200mA
0.55
Io=500mA
V IN=2.5V
V IN=3.6V
0.9
0.875
V IN=1.4V
0.5
0.85
0.8
1.2
1.6
2
2.4
2.8
Input Voltage(V)
3.2
3.6
0
1.84
1.8
1.82
Output Voltage(V)
1.7
Io=1mA
1.5
1.4
1.3
200
300
400
500
Vo=1.8V
1.9
1.6
100
Output Current(mA)
Vo=1.8V
Output Voltage(V)
0.925
Io=500mA
V IN=3.6V
1.8
V IN=3V
1.78
V IN=2.2V
1.76
1.74
1.2
1.72
Io=200mA
1.1
1.7
1
0.8
1.2
1.6
2
2.4
2.8
3.2
0
3.6
100
Input Voltage(V)
Vo=3.3V
3.5
200
300
400
500
400
500
Output Current(mA)
Vo=3.3V
3.35
3.3
Output voltage(V)
Output Voltage(V)
3.33
3.1
2.9
Io=1mA
2.7
2.5
Io=200mA
V IN=3.5V
3.31
3.29
V IN=3.6V
3.27
2.3
Io=500mA
2.1
3.25
2.2
2.5
2.8
3.1
3.4
3.7
4
0
Input voltage(V)
100
200
300
Output Current(mA)
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Typical Performance Characteristics (continued)
4. Dropout Voltage vs Output Current
Vo=0.9V
3. Output Voltage vs Temperature
Vo=0.9V
0.92
450
400
Dropout Voltage(mV)
Output Voltage(V)
0.91
V IN=2V,Io=10mA
0.9
0.89
V IN=2V,Io=200mA
0.88
0.87
350
300
250
200
150
0.86
100
25
50
75
100
125
0
100
Temperature(℃)
Vo=1.8V
400
500
400
500
400
500
Vo=1.8V
70
V IN=3V,Io=200mA
60
Dropout Voltage(mV)
1.82
Output Voltage(V)
300
Output Current(mA)
1.84
1.8
1.78
200
V IN=3V,Io=10mA
1.76
1.74
50
40
30
20
10
1.72
0
1.7
25
50
75
100
0
125
100
200
300
Output Current(mA)
Temperature(℃)
Vo=3.3V
3.32
60
Dropout voltage(mV)
3.3
Output Voltage(V)
Vo=3.3V
70
V IN=3.6V,Io=10mA
3.28
3.26
V IN=3.6V,Io=200mA
3.24
3.22
50
40
30
20
10
0
3.2
25
50
75
100
0
125
100
200
300
Output Current(mA)
Temperature(℃)
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Typical Performance Characteristics (continued)
5. Dropout Voltage vs Temperature
140
60
Quiescient Current(uA)
Dropout Voltage @ 500mA(mV)
70
50
40
30
Vo=3.3V
Vo=1.8V
20
10
6. Quiescent Current vs Input Voltage
Vo=0.9V
120
100
80
60
40
20
0
25
50
75
100
125
0
0.8
Temptrature(℃)
1.2
1.6
2
2.4
2.8
3.2
3.6
Input Voltage(V)
Vo=1.8V
Vo=3.3V
180
110
Quiescent current(uA)
Quiescient Current(uA)
120
100
90
80
70
60
160
140
120
100
Io=0mA
80
60
50
40
1.8
2.1
2.4
2.7
3
3.3
3.6
3.2
Input Voltage(V)
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
Input voltage(V)
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Typical Performance Characteristics (continued)
140
7. Ground Current vs Input voltage
Vo=0.9V
140
130
Ground Current(uA)
120
Ground Current(uA)
8. Ground Current vs Output Current
Vo=0.9V
100
Io=500mA
80
60
Io=200mA
40
Io=1mA
120
110
100
VIN=3.6V
90
VIN=2.5V
80
70
20
VIN=3.3V
60
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
0
100
Input Voltage(V)
200
120
110
110
Ground Current(uA)
Ground Current(uA)
Vo=1.8V
120
Io=500mA
Io=200mA
100
90
80
70
Io=1mA
60
400
500
400
500
400
500
Vo=1.8V
V IN=3.6V
100
90
80
V IN=3V
V IN=2.2V
70
60
50
50
1.8
2.1
2.4
2.7
3
3.3
3.6
0
100
Input Voltage(V)
200
300
Output Current(mA)
Vo=3.3V
350
150
300
140
Ground Current(uA)
Ground Current(uA)
300
Output Current(mA)
250
Io=500mA
200
Io=200mA
150
100
Vo=3.3V
V IN=3.6V
130
120
110
V IN=3.5V
100
90
Io=1mA
50
3.2
3.3
3.4
80
3.5
3.6
0
Input Voltage(V)
100
200
300
Output Current(mA)
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Typical Performance Characteristics (continued)
10. Line Transient Response
9. Load Transient Response
Vin
DC
Coupling
Io
DC
Coupling
Vo
AC
Coupling
Vo
AC
Coupling
V IN=2.2V to 3.6V,Vo=1.8V,I O=1mA
Io=1mA to 500mA,Vo=1.8V,V IN=3.3V
Audio Precision
11. Power Supply Ripple Rejection
+0
-10
-20
-30
Io
DC
Coupling
d -40
B
Io=500mA
Io=100mA
-50
Vo
AC
Coupling
-60
-70
Io=1mA
-80
10
Io=1mA to 100mA,Vo=1.8V, V IN=3.3V
20
50
100 200
500
1k
2k
5k
10k 20k
50k 100k
Hz
Vo=0.9V
Io
DC
Coupling
Vo
AC
Coupling
Io=100mA to 500mA,Vo=1.8V, V IN=3.3V
Power Analog Microelectronics , Inc
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Application Information
T h e PA M 3 1 0 5 f a m i l y o f l o w - d r o p o u t ( L D O )
regulators have several features that allow them to
apply to a wide range of applications. The family
operates with very low input voltage (1.4V) and low
dropout voltage (typically 50mV at full load),
making it an efficient stand-alone power supply or
post regulator for battery or switch mode power
supplies. The 0.5A output current makes the
PAM3105 family suitable for powering many
microprocessors. The PAM3105 family also has
low output noise (typically 40μVRMS with 2.2μF
output capacitor), making it ideal for use in telecom
equipment.
generates is:
Power=(V IN-V O)I O.
All integrated circuits have a maximum
allowable junction temperature (T J max) above
which normal operation is not assured. A system
designer must design the operating environment
so that the operating junction temperature (T J)
does not exceed the maximum junction
temperature (TJ max). The two main
environmental variables that a designer can use
to improve thermal performance are air flow and
external heatsinks. The purpose of this
information is to aid the designer in determining
the proper operating environment for a linear
regulator that is operating at a specific power
level.
External Capacitor Requirements
A 2.2μF or larger ceramic input bypass capacitor,
connected between VIN and GND and located
close to the PAM3105, is required for stability. A
1.0uF minimum value capacitor from VOUT to GND
is also required. To improve transient response,
noise rejection, and ripple rejection, an additional
10μF or larger,low ESR capacitor is recommended
at the output. A higher value, low ESR output
capacitor may be necessary if large, fast-rise-time
load transients are anticipated and the device is
located several inches from the power source,
especially if the minimum input voltage of 1.4 V is
used.
In general, the maximum expected power
(P D(max)) consumed by a linear regulator is
computed as:
PDMAX= (VI (avg)-VO (avg))×IO (avg)+VI (avg)×I (Q )
(1)
Where:
l V I (avg) is the average input voltage.
l V O(avg) is the average output voltage.
l I O(avg) is the average output current.
l I (Q) is the quiescent current.
Regulator Protection
For most LDO regulators, the quiescent current
is insignificant compared to the average output
current; therefore, the term V I(avg) xI (Q) can be
neglected. The operating junction temperature
is computed by adding the ambient temperature
(T A) and the increase in temperature due to the
regulator' s power dissipation. The temperature
rise is computed by multiplying the maximum
expected power dissipation by the sum of the
thermal resistances between the junction and
the case ( R θJC), the case to heatsink (R θCS), and
t h e h e a t s i n k t o a m b i e n t ( R θSA) . T h e r m a l
resistances are measures of how effectively an
object dissipates heat. Typically, the larger the
device, the more surface area available for
power dissipation so that the object 's thermal
resistance will be lower.
The PAM3105 features internal current limiting and
thermal protection. During normal operation, the
PAM3105 limits output current to approximately
1A. When current limiting engages, the output
voltage scales back linearly until the over current
condition ends. While current limiting is designed
to prevent gross device failure, care should be
taken not to exceed the power dissipation ratings
of the package. If the temperature of the device
exceeds 150°C, thermal-protection circuitry will
shut it down. Once the device has cooled down to
approximately 50°C below the high temp trip point,
regulator operation resumes.
Thermal Information
The amount of heat that an LDO linear regulator
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Ordering Information
PAM3105 X X X X
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
A Type
Package Type
Number of Pins
C:SOT-89
A: 3
Output Voltage
090: 0.9V
1. GND
100: 1.0V
2. VIN
120: 1.2V
3. VOUT
150: 1.5V
180: 1.8V
250: 2.5V
280: 2.8V
285:2.85V
300: 3.0V
330: 3.3V
Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and
package type availability .
Power Analog Microelectronics , Inc
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08/2007
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PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Ordering Information
Part Number
Output Voltage
PAM3105ACA090
0.9V
PAM3105ACA100
1.0V
PAM3105ACA120
1.2V
PAM3105ACA150
1.5V
PAM3105ACA180
1.8V
PAM3105ACA250
2.5V
PAM3105ACA280
2.8V
PAM3105ACA285
2.85V
PAM3105ACA300
3.0V
PAM3105ACA330
3.3V
Marking
P3105Z
XATYW
P3105Y
XATYW
P3105B
XATYW
P3105C
XATYW
P3105E
XATYW
P3105G
XATYW
P3105H
XATYW
P3105I
XATYW
P3105J
XATYW
P3105K
XATYW
Package Type
Standard Package
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
SOT-89-3
1,000Units/Tape &Reel
Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and
package type availability .
Power Analog Microelectronics , Inc
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08/2007
11
PAM3105
0.5A Low Voltage- Low Dropout CMOS Regulator
Outline Dimension
SOT - 89 - 3
4 . 5 0 . 05
1 . 650 REF
1 . 50 0 . 05
2 . 5 0 . 05
4 . 20 0 . 05
1 . 400 REF
6’
1 . 00 0 . 07
1 . 50
0 . 46 0 . 025
0 . 38 0 . 01
1 . 50
3 . 00 0 . 025
6’-2X
6’-2X
Ko
T
P2
Po
Bo
12 ' Max
D1
P1
B
A
A
W
F
E
Do
B - B SECTION
B
( Unit : mm )
8 ' Max
Ao
A - A SECTION
Symbol
Ao
Bo
Ko
Spec
4.85±0.1 4.45±0.1 1.85±0.1
Symbol
E
F
Do
Spec
Po
4.0±0.1
D1
P1
P2
T
8.0±0.10 2.0±0.05 0.254±0.02
W
10Po
12.0+0.3
1.75±0.1 5.5±0.05 1.50±0.10 1.5±0.25
40.0±0.2
-0.1
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