PAM3103AABADJ - Diodes Incorporated

A Product Line of
Diodes Incorporated
PAM3103
300mA ADJUSTABLE HIGH PSRR CMOS LINEAR REGULATOR
Description
Pin Assignments
Top View
TSOT25
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.
Features

Low Dropout Voltage: [email protected] 300mA ( VO = 3.3V)

Accuracy within ±2%

Quiescent Current: 65µA Typ.

High PSRR: [email protected]

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
VO = VREF*(R1+R2)/R2
PAM3103
Document number: DSxxxxx Rev. 1 - 5
1 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
Pin Descriptions
Pin
Number
1
2
3
4
5
Pin
Name
VIN
GND
EN
ADJ
VOUT
Function
Input
Ground
Chip Enable (Active High)
Adjustable Pin
Output
Functional Block Diagram
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
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
Inout Voltage
Output Current
Output Pin Voltage
Lead Soldering Temperature
Storage Temperature
PAM3103
Document number: DSxxxxx Rev. 1 - 5
Rating
6.0
300
Unit
V
mA
GND -0.3 to VIN +0.3V
300
-65 to +150
°C
°C
V
2 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Rating
Unit
Supply Voltage Range
Parameter
2.5 to 5.5
V
Junction Temperature
-40 to +125
Operation Temperature
-40 to +85
°C
Thermal Information
Parameter
Symbol
θJC
Thermal Resistance Junction to Case)
Thermal Resistance (Junction to Ambient)
θJA
Internal Power Dissipation
PD
Package
Max
TSOT25
130
SOT353(SC70-5)
TBD
TSOT25
250
SOT353(SC70-5)
300
TSOT25
400
SOT353(SC70-5)
300
Unit
°C/W
mW
Electrical Characteristics (@TA = +25°C, VIN = 4V, VO = 3V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.)
Parameter
Input Voltage
Output Voltage
Reference Voltage
Output Voltage Accuracy
Symbol
Typ
Max
Units
5.5
V
VO
1.2
5
V
2
%
1.235
VREF
VO
IO
Short Circuit Current
ISC
Dropout Voltage
VDROP
Ground Current
IGND
IQ
-2
IO = 1mA
300
V
Note 2
150
VO = 0V
mA
mA
2.5V ≤ VO < 3.3V
370
450
VO ≥ 3.3V
180
230
IO = 1mA to 300mA
70
90
IO = 0mA
65
90
µA
-0.4
0.2
0.4
%/V
-1
0.2
1
IO = 300mA
Line Regulation
LNR
IO = 1mA, VIN = 3V to 5V
Load Regulation
LDR
IO = 1mA to 300mA
Temperature Coefficient
Min
Note 1
Output Current
Quiescent Current
Test Conditions
VIN
TC
mV
µA
%
40
Ppm/°C
°C
Over Temperature Shutdown
OTS
IO = 1mA
150
Over Temperature Hysteresis
OTH
IO = 1mA
30
°C
67
65
42
dB
dB
dB
50
µVRMS
Power Supply Ripple Rejection
PSRR
IO = 100mA, VO = 1.2V
Output Noise
VN
f = 10Hz to 100kHz
EN Input High Threshold
VIH
VIN 2.5V to 5V
EN Input Low Threshold
VIL
VIN 2.5V to 5V
Shutdown Current
ISD
VEN = 0V
Notes:
f = 100Hz
f = 1kHz
f = 10kHz
1.5
V
0.01
0.3
V
1
µA
1. The minimym inout voltage (VIN(MIN) of the PAM3103 is determined by output voltage and dropout voltage. The minimum input voltage is defined as:
VIN(MIN) = VO +VDROP
VIN(MIN) = 2.5V
2. Output current is limited by PD, maximum IO = PD/(VIN(MAX) – VO).
PAM3103
Document number: DSxxxxx Rev. 1 - 5
3 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
Typical Performance Characteristics (@TA = +25°C, VO = 1.2V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.)
PAM3103
Document number: DSxxxxx Rev. 1 - 5
4 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
Typical Performance Characteristics (cont.)
PAM3103
Document number: DSxxxxx Rev. 1 - 5
5 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
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 CIN 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
distance between CIN and the input pin of the PAM3103 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3103.
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:
V O  VREF 1  R1 / R2
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. CC is unnecessary when R1
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:
R1  V O / VREF  1R2
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
A Product Line of
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:
PD  VIN  V OUT  * IO  VIN * IGND
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:


PD(MAX )  TJ(MAX )  T A / JA
Where TJ(MAX) is the maximum allowable junction temperature +125°C, TA is the ambient temperature and θJA is the thermal resistance from the
junction to the ambient.
For example, as θJA 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
power dissipation at TA = +25°C can be calculated by following formula:
PD(MAX)  125C  25C / 250  0.4 W
It is also useful to calculate the junction temperature of the PAM3103 under a set of specific conditions. Suppose the input voltage VIN = 3.3V,
the output current IO =300mA and the case temperature TA = +40°C measured by a thermal couple during operation, the power dissipation is
defined as:
PD  3.3 V  2.8 V  * 300mA  3.3 V * 70A  150mW
And the junction temperature TJ can be calculated as follows:
TJ = TA + PD* θJA
TJ = 40°C + 0.15W*250°C/W
= 40°C + 37.5°C
=77.5°C<TJ(MAX) = +125°C
For this application, TJ is lower than the absolute maximum operating junction temperature +125°C, so it is safe to use the PAM3103 in this
configuration.
PAM3103
Document number: DSxxxxx Rev. 1 - 5
7 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
Ordering Information
Part Number
PAM3103AABADJ
PAM3103AUBADJ
Output Voltage
ADJ
ADJ
Part Marking
ACAYW
ACAYW
Package Type
TSOT25
SOT353(SC70-5)
Standard Package
3000Units/Tape&Reel
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
A Product Line of
Diodes Incorporated
PAM3103
Package Outline Dimensions (All dimensions in mm.)
TSOT25
PAM3103
Document number: DSxxxxx Rev. 1 - 5
9 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
Package Outline Dimensions (cont.) (All dimensions in mm.)
PAM3103
Document number: DSxxxxx Rev. 1 - 5
10 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM3103
IMPORTANT NOTICE
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 unauthorized 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.
LIFE SUPPORT
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
PAM3103
Document number: DSxxxxx Rev. 1 - 5
11 of 11
www.diodes.com
July 2013
© Diodes Incorporated