Page 1
A
f
Description
Product Line o
Diodes Incorporated
PAM3103
300mA ADJUSTABLE HIGH PSRR CMOS LINEAR REGULATOR
Pin Assignments
The PAM3103 is a positive, adjustable linear regulator. It features low
quiescent current (65µA 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. Spacesaving TSOT25 and SOT353(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 2.2µF or
greater.
Top View
TSOT25
Features
Low Dropout Voltage: 180mV@ 300mA ( VO = 3.3V)
Accuracy within ±2%
Quiescent Current: 65µA Typ.
High PSRR: 67dB@100Hz
Excellent Line/Load Regulation
Fast Response
Current Limiting
Short Circuit Protection
Low Temperature Coefficient
Shutdown Current: 0.5µA
Thermal Shutdown
Space Saving Packages TSOT25 and SOT353(SC70-5)
Pb-Free Package
Applications
Cordless Phone
Cellular Phone
Bluetooth Earphone
Digital Camera
Portable Electronics
WLAN
MP3 Player
Typical Applications Circuit
V
= V
O
PAM3103
Document number: DSxxxxx Rev. 1 - 5
www.diodes.com
*(R1+R2)/R2
REF
1 of 11
July 2013
© Diodes Incorporated
Page 2
A
f
Product Line o
Diodes Incorporated
PAM3103
Pin Descriptions
Pin
Number
1 VIN
2 GND
3 EN
4 ADJ
5 VOUT
Pin
Name
Function
Input
Ground
Chip Enable (Active High)
Adjustable Pin
Output
Functional Block Diagram
Absolute Maximum Ratings (@T
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.
Parameter Rating Unit
Inout Voltage 6.0 V
Output Current 300 mA
Output Pin Voltage
Lead Soldering Temperature 300 °C
Storage Temperature -65 to +150 °C
PAM3103
Document number: DSxxxxx Rev. 1 - 5
= +25°C, unless otherwise specified.)
A
GND -0.3 to V
+0.3V
IN
www.diodes.com
2 of 11
V
July 2013
© Diodes Incorporated
Page 3
A
f
Product Line o
Diodes Incorporated
PAM3103
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
A
Parameter Rating Unit
Supply Voltage Range 2.5 to 5.5 V
Junction Temperature -40 to +125
Operation Temperature -40 to +85
°C
Thermal Information
Parameter Symbol Package Max Unit
Thermal Resistance Junction to Case)
Thermal Resistance (Junction to Ambient)
Internal Power Dissipation
θ
JC
θ
JA
P
D
Electrical Characteristics (@T
= +25°C, VIN = 4V, VO = 3V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.)
A
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage
Output Voltage
Reference Voltage
Output Voltage Accuracy
Output Current
Short Circuit Current
Dropout Voltage
Ground Current
Quiescent Current
V
V
I
V
V
REF
V
I
I
SC
DROP
GND
I
Line Regulation LNR
Load Regulation LDR
Temperature Coefficient
T
Over Temperature Shutdown OTS
Over Temperature Hysteresis OTH
Power Supply Ripple Rejection PSRR
Output Noise
EN Input High Threshold
EN Input Low Threshold
Shutdown Current
Notes: 1. The minimym inout voltage (V
V
V
2. Output current is limited by P
IN(MIN)
IN(MIN)
= VO +V
= 2.5V
DROP
D
V
V
V
I
SD
) of the PAM3103 is determined by output voltage and dropout voltage. The minimum input voltage is defined as:
IN(MIN
, maximum IO = PD/(V
IN
O
IO = 1mA
O
300 Note 2 mA
O
VO = 0V
IO = 300mA
IO = 1mA to 300mA
IO = 0mA
Q
I
= 1mA, VIN = 3V to 5V
O
= 1mA to 300mA
I
O
40 Ppm/°C
C
= 1mA
I
O
I
= 1mA
O
= 100mA, VO = 1.2V
I
O
f = 10Hz to 100kHz 50
N
VIN 2.5V to 5V
IH
VIN 2.5V to 5V
IL
VEN = 0V
– VO).
IN(MAX)
PAM3103
Document number: DSxxxxx Rev. 1 - 5
TSOT25 130
SOT353(SC70-5) TBD
TSOT25 250
SOT353(SC70-5) 300
TSOT25 400
SOT353(SC70-5) 300
2.5V ≤ V
< 3.3V
O
VO ≥ 3.3V
f = 100Hz 67 dB
f = 1kHz 65 dB
f = 10kHz 42 dB
3 of 11
www.diodes.com
°C/W
mW
Note 1 5.5 V
1.2 5 V
1.235 V
-2 2 %
150 mA
370 450
180 230
mV
70 90 µA
65 90 µA
-0.4 0.2 0.4 %/V
-1 0.2 1 %
150 °C
30 °C
µV
RMS
1.5 V
0.3 V
0.01 1 µA
July 2013
© Diodes Incorporated
Page 4
A
f
Typical Performance Characteristics (@T
Product Line o
Diodes Incorporated
PAM3103
= +25°C, VO = 1.2V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.)
A
PAM3103
Document number: DSxxxxx Rev. 1 - 5
4 of 11
www.diodes.com
© Diodes Incorporated
July 2013
Page 5
A
f
Typical Performance Characteristics (cont.)
Product Line o
Diodes Incorporated
PAM3103
PAM3103
Document number: DSxxxxx Rev. 1 - 5
5 of 11
www.diodes.com
July 2013
© Diodes Incorporated
Page 6
A
f
Product Line o
Diodes Incorporated
PAM3103
Application Information
Capacitor Selection and Regulator Stability
Similar to any low dropout regulator, the external capacitors used with the PAM3103 must be carefully selected for regulator stability and
performance.
A capacitor C
distance between C
Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response.
The PAM3103 is designed specifically to work with low ESR ceramic output capacitors in order to save space and improve performance. Using
an output ceramic capacitor whose value is > 2.2µF with ESR>5mΩ ensures stabilty.
ADJ Output Voltage Programming
The output voltage of the PAM3103 adjustable regulator is programed by using an external resistor divider as shown in Figure1. The output
voltage is calculated as below:
of more than 1μF can be employed in the input pin, while there is no upper limit for the capacitance of CIN. Please note that the
IN
and the input pin of the PAM3103 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3103.
IN
VV
REFO
2R/1R1
Resistor R1 and R2 should be chosen for approximately 7µA divider current. Lower value resistors can be used but offer no advantage and
waste more power. Higher value should be avoided as leakage current at ADJ pin increase the output voltage error.
or R2 <20kΩ. The recommended design procedure is to choose R2 =169kΩ to set the divider current at 7µA and then calculate R1 as below:
1R
/
V
V
REFO
2R1
CC is unnecessary when R1
Load Transient Considerations
Curve 7 of the PAM3103 load-transient response on page 5 shows two components of the output response: a DC shift from the output
impedance due to the load current change and transient response. The DC shift is quite small due to excellent load regulation of the PAM3103.
The transient spike, resulting from a step change in the load current from 1mA to 300mA, is 20mV. The ESR of the output capacitor is critical to
the transient spike. A larger capacitance along with smaller ESR results in a smaller spike.
Shutdown Input Operation
The PAM3103 can be shut down by pulling the EN input low, and turned on by tying the EN input to VIN or leaving the EN input floating.
Internal P-Channel Pass Transistor
The PAM3103 features a 0.75Ω device as a pass transistor. The PMOS pass transistor enables the PAM3103 to consume only 65µA of ground
current during low dropout, light-load, or heavy-load operation. This feature increases the battery operation life time.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. The PAM3103 has a
typical 300mV dropout voltage. In batterypowered systems, this will determine the useful end-of-life battery voltage.
Current Limit and Short Circuit Protection
The PAM3103 features a current limit, which monitors and controls the gate voltage of the pass transistor. The output current can be limited to
400mA by regulating the gate voltage. The PAM3103 also has a built-in short circuit current limit.
PAM3103
Document number: DSxxxxx Rev. 1 - 5
6 of 11
www.diodes.com
July 2013
© Diodes Incorporated
Page 7
A
f
Product Line o
Diodes Incorporated
PAM3103
Application Information (cont.)
Thermal Considerations
Thermal protection limits power dissipation in the PAM3103. When the junct ion temperature exceeds +150°C, the OTP (Over Temperature
Protection) starts the thermal shutdown and turns the pass transistor off. The pass transistor resumes operation after the junction temperature
drops below +120°C.
For continuous operation, the junction temperature should be maintained below +125°C. The power dissipation is defined as below:
The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surrounding airflow and temperature
difference between junction and ambient. The maximum power dissipation can be calculated by the following formula:
*
VVP
*
I
VI
GNDINOOUTIND
/
TTP
A)MAX(J)MAX(D
JA
Where T
junction to the ambient.
For example, as θ
power dissipation at T
It is also useful to calculate the junction temperature of the PAM3103 under a set of specific conditions. Suppose the input voltage V
the output current I
defined as:
And the junction temperature T
T
T
= 40°C + 37.5°C
=77.5°C<T
For this application, T
configuration.
is the maximum allowable junction temperature +125°C, TA is the ambient temperature and θJA is the thermal resistance from the
J(MAX)
is 250°C/W for the SOT-23 package based on the standard JEDEC 51-3 for a single-layer thermal test board, the maximum
JA
= +25°C can be calculated by following formula:
A
W4.0250/C25C125
P
)MAX(D
=300mA and the case temperature TA = +40°C measured by a thermal couple during operation, the power dissipation is
O
P
D
can be calculated as follows:
J
= TA + PD* θJA
J
= 40°C + 0.15W*250°C/W
J
= +125°C
J(MAX)
is lower than the absolute maximum operating junction temperature +125°C, so it is safe to use the PAM3103 in this
J
mW150A70*V3.3mA300*V8.2V3.3
= 3.3V,
IN
PAM3103
Document number: DSxxxxx Rev. 1 - 5
7 of 11
www.diodes.com
July 2013
© Diodes Incorporated
Page 8
A
f
Ordering Information
Product Line o
Diodes Incorporated
PAM3103
Part Number Output Voltage Part Marking Package Type Standard Package
PAM3103AABADJ ADJ ACAYW TSOT25 3000Units/Tape&Reel
PAM3103AUBADJ ADJ ACAYW SOT353(SC70-5) 3000Units/Tape&Reel
Marking Information
Top View
TSOT25
PAM3103
Document number: DSxxxxx Rev. 1 - 5
8 of 11
www.diodes.com
July 2013
© Diodes Incorporated
Page 9
A
f
Package Outline Dimensions (All dimensions in mm.)
TSOT25
Product Line o
Diodes Incorporated
PAM3103
PAM3103
Document number: DSxxxxx Rev. 1 - 5
9 of 11
www.diodes.com
© Diodes Incorporated
July 2013
Page 10
A
f
Package Outline Dimensions (cont.) (All dimensions in mm.)
Product Line o
Diodes Incorporated
PAM3103
PAM3103
Document number: DSxxxxx Rev. 1 - 5
10 of 11
www.diodes.com
July 2013
© Diodes Incorporated
Page 11
A
f
Product Line o
Diodes Incorporated
PAM3103
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorize d application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2013, Diodes Incorporated
www.diodes.com
IMPORTANT NOTICE
LIFE SUPPORT
PAM3103
Document number: DSxxxxx Rev. 1 - 5
11 of 11
www.diodes.com
July 2013
© Diodes Incorporated
Loading...