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Description
The PAM3112 regulator features low quiescent current (65µA Typ)
and excellent line/load regulation, making it ideal for battery powered
applications. The output voltage can be 1.2V or 1.3V. Space-saving
packages SOT23, TSOT25, SOT-89 and SC70 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. The device is stable with an output capacitance
of 2.2µF or greater.
Features
• Accuracy within ±2%
• Quiescent Current: 65µA Typ.
• Excellent Line/Load Regulation
• Guaranteed 300mA Output Current
• Fast Response
• Current Limiting
• Short Circuit Protection
• Low Temperature Coefficient
• Thermal Shutdown
• Space Saving Package: SOT23, TSOT25, SOT-89 and SC70
• Pb-Free Package
Applications
Pin Assignments
Top View
SOT23
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PAM3112
300mA CMOS LINEAR REGULATOR
Top View
TSOT25
• Cordless Phone
• Cellular Phone
• Bluetooth Earphone
• Digital Camera
• Portable Electronics
• WLAN
• MP3 Player
Typical Applications Circuit
PAM3112
Document number: DSxxxxx Rev. 2 - 3
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Pin Configuration and Description
Package
Type
SOT23
TSOT25 VIN GND EN BYP VOUT
SOT89-3
SC70-3L VIN VOUT GND —
SC70-4L EN GND VOUT VIN
SC70-5L VIN GND EN BYP VOUT
Pin Name Function
VIN Input
GND Ground
EN Chip Enable (active high)
BYP Bypass Pin, need a 10nF capacitor connect to GND
VOUT Output
1 2 3 4 5
VOUT GND VIN — —
GND VOUT VIN — —
GND VIN VOUT — —
VOUT GND VIN — —
Pin Number
Functional Block Diagram
PAM3112
PAM3112
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PAM3112
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
Output Pin Voltage
Lead Soldering Temperature 300, (5sec) °C
Maximum Junction Temperature 150 °C
Storage Temperature -65 to +150 °C
ESD Rating Class B —
Recommended Operating Conditions (@T
Parameter Rating Unit
Junction Temperature -40 to +125
Ambient Temperature -40 to +85
= +25°C, unless otherwise specified.)
A
P
/(VIN – VO)
D
GND -0.3 to V
+0.3V
IN
= +25°C, unless otherwise specified.)
A
—
V
°C
Thermal Information
Parameter Symbol Package Max Unit
SOT23/
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient)
Internal Power Dissipation (@TA = +25°C) PD
PAM3112
Document number: DSxxxxx Rev. 2 - 3
θ
JC
θ
JA
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TSOT25
SOT-89 45
SC70 TBD
SOT23/
TSOT25
SOT-89 160
SC70 300
SOT23/
TSOT25
SOT-89 550
SC70 300
130
250
400
°C/W
mW
January 2013
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PAM3112
Electrical Characteristics (@T
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage
Output Voltage Accuracy
Output Current
Ground Current
Quiescent Current
Line Regulation LNR
Load Regulation LDR
Short Circuit Current
Temperature Coefficient
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. Output current is limited by PD, maximum IO = 400mW/ (V
PAM3112
Document number: DSxxxxx Rev. 2 - 3
V
V
I
GND
I
V
V
I
= +25°C, VIN = 3V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.)
A
IN
I O = 1mA
O
300 Note 1 mA
I
O
IO = 1mA to 300mA
I
IO = 0mA
Q
V
= 2.5V to 5.0V IO = 10mA
IN
I
= 1mA to 300mA
O
VO = 0V
SC
T
V
40 ppm/°C
C
I
= 1mA
O
I
= 1mA
O
I
= 100mA
O
= 10nF
C
BYP
f = 10Hz to 100kHz, C
N
V IN = 2.5V to 5V
IN
V IN = 2.5V to 5V
IL
VEN = 0V
SD
IN(MAX)
BYP
– V
= 10nF
O
f = 100Hz 70
f = 1kHz 65
).
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2.5 5.5 V
-2 +2 %
70 90 µA
65 90 µA
-0.15 0.10 0.15 %/V
30 60 mV
130 mA
150 °C
30 °C
dB
50
µV
RMS
1.5 V
0.3 V
0.01 1 µA
January 2013
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Typical Performance Characteristics (@T
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PAM3112
= +25°C, CIN = 1µF, CO = 2.2µF, VO = 1.2V, unless otherwise specified.)
A
PAM3112
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Typical Performance Characteristics (cont.) (@T
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PAM3112
= +25°C, CIN = 1µF, CO = 2.2µF, VO = 1.2V, unless otherwise specified.)
A
PAM3112
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PAM3112
Application Information
Capacitor Selection and Regulator Stability
Similar to any low dropout regulator, the external capacitors used with the PAM3112 must be carefully selected for regulator stability and
performance.
A capacitor C
the distance between C
Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response.
The PAM3112 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 stability.
A 10nF bypass capacitor connected to BYP pin is suggested for suppressing output noise. The capacitor, in series connection with an internal
200kΩ resistor, forms a low-pass filter for noise reduction. Increasing the capacitance will slightly decrease the output noise, but increase the
startup time.
Load Transient Consideration
Curve 7 of the PAM3112 load-transient response on page 6 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 PAM3112.
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 PAM3112 is 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 PAM3112 features a 0.75Ω P-Channel MOSFET device as a pass transistor. The P-MOS pass transistor enables the PAM3112 to consume
only 65µA of ground current during low dropout, light-load, or heavy-load operation. These features increase the battery operation life time.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage difference (or dropout voltage) determines the lowest usable supply voltage. The PAM3112 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 PAM3112 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 PAM3112 also has a built-in short circuit current limit.
Thermal Considerations
Thermal protection limits power dissipation in the PAM3112. 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 used at the PAM3112 input pin, while there is no upper limit for the capacitance of CIN. Please note that
IN
and the input pin of the PAM3112 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3112.
IN
()
V V P
+ − =
*
V I
*
I
GND IN O OUT IN D
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:
PAM3112
Document number: DSxxxxx Rev. 2 - 3
− =
/
θ
T T P
A ) MAX (J ) MAX (D
JA
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Application Information
Thermal Considerations
Where T
junction to the ambient.
For example, as θ
the maximum power dissipation at T
is the maximum allowable junction temperature +125°C, TA is the ambient temperature and is the thermal resistance from the
J(MAX)
is 250°C/W for the SOT23 and TSOT25 packages based on the standard JEDEC 51-3 for a single-layer thermal test board,
JA
A
P
) MAX (D
(cont.)
= +25°C can be calculated by following formula:
W 4.0 250 / C 25 C 125
= ° − ° = SOT-23
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PAM3112
It is also useful to calculate the junction temperature of the PAM3112 under a set of specific condition. Suppose the input voltage V
output current I
defined as:
And the junction temperature, T
T
T
= 40°C +78.75°C
= 118.75°C<T
For this application, T
configuration.
=150mA 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*θ JA
J
= 40°C +0.35W*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 PAM3112 in this
J
mW 315 A 70 * V 3.3 mA 150 * V 2.1 V 3.3
≅ μ + − =
=3.3V, the
IN
PAM3112
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Ordering Information
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PAM3112
Output
Voltage
A Type:
B Type:
D Type:
Pin
Configuration
1. VOUT
2. GND
3. VIN
1. GND
2. VOUT
3. VIN
1. VIN
2.GND
3.EN
4.BYP
F Type:
G Type:
H Type:
1. EN
2. GND
3. VOUT
4. VIN
1. VIN
2. VOUT
3. GND
1. GND
2. VIN
3. VOUT
Package
Type
A: SOT23/TSOT25
C: SOT-89
U: SC70
Number of
Pins
A: 3
K: 4
B: 5
F: 6
120: 1.2V
130: 1.3V
5.VOUT
Part Number Output Voltage Marking Package Type Standard Package
PAM3112AAA120 1.2V AOBYW SOT23 3000 Units/ Tape&Reel
PAM3112BAA120 1.2V AOBYW SOT23 3000 Units/ Tape&Reel
PAM3112DAB120 1.2V AOBYW TSOT25 3000 Units/ Tape&Reel
PAM3112ACA120 1.2V
PAM3112HCA120 1.2V
PAM3112GUA120 1.2V AOBYW SC70-3 3000 Units/ Tape&Reel
PAM3112FUK120 1.2V AOBYW SC70-4 3000 Units/ Tape&Reel
PAM3112DUB120 1.2V AOBYW SC70-5 3000 Units/ Tape&Reel
PAM3112AAA130 1.3V AOWYW SOT23 3000 Units/ Tape&Reel
PAM3112BAA130 1.3V AOWYW SOT23 3000 Units/ Tape&Reel
PAM3112DAB130 1.3V AOWYW TSOT25 3000 Units/ Tape&Reel
PAM3112ACA130 1.3V
PAM3112HCA130 1.3V
PAM3112GUA130 1.3V AOWYW SC70-3 3000 Units/ Tape&Reel
PAM3112FUK130 1.3V AOWYW SC70-4 3000 Units/ Tape&Reel
PAM3112DUB130 1.3V AOWYW SC70-5 3000 Units/ Tape&Reel
PAM3112
Document number: DSxxxxx Rev. 2 - 3
P3112B
XXXYW
P3112B
XXXYW
P3112W
XXXYW
P3112W
XXXYW
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SOT89-3 1000 Units/ Tape&Reel
SOT89-3 1000 Units/ Tape&Reel
SOT89-3 1000 Units/ Tape&Reel
SOT89-3 1000 Units/ Tape&Reel
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Marking Information
Top View
SOT23
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PAM3112
Top View
TSOT25
PAM3112
Document number: DSxxxxx Rev. 2 - 3
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Package Outline Dimensions (All dimensions in mm.)
SOT23
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PAM3112
PAM3112
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Package Outline Dimensions (cont.) (All dimensions in mm.)
TSOT25
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PAM3112
PAM3112
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Package Outline Dimensions (cont.) (All dimensions in mm.)
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PAM3112
PAM3112
Document number: DSxxxxx Rev. 2 - 3
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Package Outline Dimensions (cont.) (All dimensions in mm.)
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PAM3112
PAM3112
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Package Outline Dimensions (cont.) (All dimensions in mm.)
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PAM3112
PAM3112
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Package Outline Dimensions (cont.) (All dimensions in mm.)
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PAM3112
PAM3112
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PAM3112
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
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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
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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
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
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
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Copyright © 2013, Diodes Incorporated
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IMPORTANT NOTICE
LIFE SUPPORT
PAM3112
Document number: DSxxxxx Rev. 2 - 3
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