Page 1
A
f
DUAL 150mA HIGH PSRR LOW-DROPOUT CMOS REGULATOR
Description
The dual LDO PAM3102 series of positive voltage linear regulators
feature high output voltage accuracy, low quiescent current and low
dropout voltage, making them ideal for battery powered applications.
The line transient response and load transient response are excellent.
Their high PSRR make them useful in applications where AC noise
on the input power supply must be suppressed. Space-saving
TSOT26 package for 2-ch LDOs is attractive for portable and
handheld applications. They have both thermal shutdown and a
current limit feature to prevent device failure under extreme operating
conditions. They are stable with an output capacitance of 2.2μF or
greater.
Features
Output Accuracy: ±2%
Low Dropout Voltage: 180mV@150mA
High PSRR: 70dB@100Hz
Low Noise Output
Current Limiting
Short Circuit Protection
Thermal Shutdown
Space Saving Package TSOT26
Pb-Free Package
Typical Applications Circuit
Diodes Incorporated
Pin Assignments
Applications
Cellular Phone
Portable Electronics, PDA
Wireless Devices, Wireless LAN
Computer Peripherals
Camera Module
GPS Receiver
Product Line o
Top View
TSOT26
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
1 of 12
www.diodes.com
July 2013
© Diodes Incorporated
Page 2
A
f
Pin Descriptions
Pin
Number
1 CE1
2 VIN
3 CE2
4 VOUT2
5 GND
6 VOUT1
Pin
Name
Output 1 Enable
Input
Output 2 Enable
Output 2
Ground
Output 1
Functional Block Diagram
Product Line o
Diodes Incorporated
PAM3102
Function
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
Input Voltage 6.0 V
Output Current 150/150 mA
Output Pin Voltage
Storage Temperature -40 to +125 °C
ESD Rating (HBM) 2 kV
Lead Soldering Temperature 300, (5sec) °C
PAM3102
Document number: DSxxxxx Rev. 1 - 2
= +25°C, unless otherwise specified.)
A
GND -0.3 to V
+0.3V
IN
www.diodes.com
2 of 12
V
July 2013
© Diodes Incorporated
Page 3
A
f
Product Line o
Diodes Incorporated
PAM3102
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
A
Parameter Rating Unit
Supply Voltage Range 5.5 V
Enable Input Resistance
0 to V
IN
Junction Temperature -40 to +125
Operation Temperature -40 to +85
V
°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, V
A
CE1
= V
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage
Output Voltage
Dropout Voltage
V
V
V
DROP
IN
IO = 1mA
O
= 1.8V, IO = 150mA
V
O
VO = 2.5V, IO = 150mA
VO = 2.8V, IO = 150mA
Output Current
Current Limit
Quiescent Current
Ground Pin Current
Shutdown Current
Short Circuit Current
I
I
GND
I
I
I
LIM
I
SD
SC
Line Regulation LNR
150 Note 2 mA
O
VO ≥ 1.2V
IO = 0mA
Q
IO = 1mA to 150mA
V
CE1
= V
CE2
= 0V
VO = 0V
I
= 50mA, VIN = 3V to 4V VO = 1.8V
O
IO = 50mA, VIN = 3.5V to 4.5V VO = 2.5V
IO = 50mA, VIN = 3.8V to 4.8V VO = 2.8V
Load Regulation LDR
Power Supply Ripple Rejection PSRR
Output Noise
CE Input High Threshold
CE Input Low Threshold
CE Pull-Up Resistance
V
V
V
R
V
= 3.3V, IO = 1mA to 150mA
IN
I
= 50mA, VO = 1.8V
O
f = 10Hz to 100kHz 35
N
1.5 V
TH
0.3 V
TL
1.7 5 15 MΩ
CE
Temperature Coefficient TC 40 ppm/°C
Over Temperature Shutdown OTS
Over Temperature Hysteresis OTH
Notes: 1. The minimym inout voltage (V
V
2. Output current is limited by P
IN(MIN)
= VO +V
DROP
IN(MIN
D
, maximum IO = PD/(V
I
= 1mA
O
I
= 1mA
O
) of the PAM3102 is determined by output voltage and dropout voltage. The minimum input voltage is defined as:
– VO).
IN(MAX)
TSOT26 130
TSOT26 250
°C/W
TSOT26 400 mW
= VIN = VO +1V, CIN = 2.2µF, CO = 2.2µF, unless otherwise specified.)
CE2
Note 1 5.5 V
-2.0 +2.0 %
950
350
180
200 mA
175 250 µA
200 250 µA
0.1 1 µA
150 mA
-0.15 0.1 0.15 %/V
-2 1.0 2 %
f = 100Hz 70 dB
f = 1kHz 63 dB
f = 10kHz 45 dB
155 °C
40 °C
mV
µV
RMS
PAM3102
Document number: DSxxxxx Rev. 1 - 2
3 of 12
www.diodes.com
July 2013
© Diodes Incorporated
Page 4
A
f
Typical Performance Characteristics (@T
Product Line o
Diodes Incorporated
= +25°C, CIN = 2.2µF, CO = 2.2µF, unless otherwise specified.)
A
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
www.diodes.com
4 of 12
© Diodes Incorporated
July 2013
Page 5
A
f
Typical Performance Characteristics (cont.)
Product Line o
Diodes Incorporated
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
www.diodes.com
5 of 12
July 2013
© Diodes Incorporated
Page 6
A
f
Typical Performance Characteristics (cont.)
Product Line o
Diodes Incorporated
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
6 of 12
www.diodes.com
July 2013
© Diodes Incorporated
Page 7
A
f
Typical Performance Characteristics (cont.)
Product Line o
Diodes Incorporated
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
7 of 12
www.diodes.com
© Diodes Incorporated
July 2013
Page 8
A
f
Typical Performance Characteristics (cont.)
Product Line o
Diodes Incorporated
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
8 of 12
www.diodes.com
© Diodes Incorporated
July 2013
Page 9
A
f
Product Line o
Diodes Incorporated
PAM3102
Application Information
Capacitor Selection and Regulator Stability
Similar to any low dropout regulator, the external capacitors used with the PAM3102 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 PAM3102 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 stablilty.
Shutdown Input Operation
The PAM3102 is shutdown by pulling the CE input low, and turned on by tying the CE input to VIN or leaving the CE input floating.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. The PAM3102 has a
typical 180mV dropout voltage. In batterypowered systems, this will determine the useful end-of-life battery voltage.
Current Limit and Short Circuit Protection
The PAM3102 features a current limit, which monitors and controls the gate voltage of the pass transistor. The output current can be limited to
300mA by regulating the gate voltage. The PAM3102 also has a built-in short circuit current limit.
Thermal Considerations
Thermal protection limits power dissipation in the PAM3102. When the junction 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:
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 PAM3102 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3102.
IN
*
VVP
*
I
VI
GNDINOOIND
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:
/
Where T
junction to the ambient.
For example, as 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 T
It is also useful to calculate the junction temperature of the PAM3102 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 + 75°C
=115°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)
=25°C can be calculated by following formula:
A
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
= TA + PD*θJA
J
= 40°C +0.3W*250°C/W
J
J(MAX)
is lower than the absolute maximum operating junction temperature,+125°C, so it is safe to use the PAM3102 in this
J
TTP
can be calculated as follows:
J
= +125°C
PAM3102
Document number: DSxxxxx Rev. 1 - 2
A)MAX(J)MAX(D
JA
W4.0250/C25C125
SOT-23
= 3.3V,
IN
)V8.1V3.3(mA150*V8.2V3.3
mW300A200*V3.3mA150*
9 of 12
www.diodes.com
July 2013
© Diodes Incorporated
Page 10
A
f
Ordering Information
Product Line o
Diodes Incorporated
PAM3102
Part Number Output Voltage Part Marking Package Type Standard Package
PAM3102-AST26R1
PAM3102-BST26R1
VOUT1 1.8V
VOUT2 2.8V
VOUT1 1.8V
VOUT2 2.5V
ABAYW TSOT26 3000Units/Tape&Reel
ABBYW TSOT26 3000Units/Tape&Reel
Marking Information
Top View
TSOT26
PAM3102
Document number: DSxxxxx Rev. 1 - 2
10 of 12
www.diodes.com
July 2013
© Diodes Incorporated
Page 11
A
f
Package Outline Dimensions (All dimensions in mm.)
Product Line o
Diodes Incorporated
PAM3102
PAM3102
Document number: DSxxxxx Rev. 1 - 2
11 of 12
www.diodes.com
© Diodes Incorporated
July 2013
Page 12
A
f
Product Line o
Diodes Incorporated
PAM3102
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
PAM3102
Document number: DSxxxxx Rev. 1 - 2
12 of 12
www.diodes.com
July 2013
© Diodes Incorporated
Loading...