PAM3116
Document number: DS36427 Rev. 2 - 3
1 of 10
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August 2017
© Diodes Incorporated
PAM3116
1.5A LOW DROPOUT VOLTAGE CMOS REGULATOR
Description
The PAM3116 is a 1.5A CMOS LDO regulator that features a low
quiescent current and low dropout voltages, as well as over
temperature shutdown. The PAM3116 is stable with a ceramic output
capacitor of 4.7µF 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 suitable for applications requiring low
input and output voltages.
PAM3116 is available in SOP-8 package.
Features
High Output Current Up to 1.5A
Output Voltage Available in ADJ(0.8V)
Stable with a Ceramic Output Capacitor
Dropout Voltage: 300mV@1.5A, Vo = 3.3V
Low Quiescent Current
Over Temperature Shutdown
Short Circuit Protection
Low Temperature Coefficient
Standard SOP-8 Packages
Pb-Free Package
Pin Assignments
Applications
LCD TV/Monitors
Set-top Box
IPhone Charger
Communication Devices
Typical Applications Circuit
VOUT = 0.8 x (1+R1/R2)
NOT RECOMMENDED FOR NEW DESIGN
USE AP2132 OR AP7173
PAM3116
Document number: DS36427 Rev. 2 - 3
2 of 10
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August 2017
© Diodes Incorporated
PAM3116
Pin Description
Pin Name
Pin Number
Function
SOP-8
VIN
2
Supply Input Voltage.
EN
3
Chip Enable
ADJ
6
Set the output voltage by the feedback resistors.
VOUT
7
Output Voltage.
NC
1, 5, 8
No Internal Connection.
GND
4
Ground
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
Rating
Unit
Input Voltage
6.5
V
Output Pin Voltage
-0.3 to VIN +0.3
V
EN, ADJ, OUTPUT SENSE Pin Voltage
-0.3 to VIN +0.3
V
Maximum Output Current
PD/(VIN–VO)
—
Storage Temperature
-65 to +150
°C
Maximum Junction Temperature
150
°C
Lead Soldering Temperature
300, (5sec)
°C
NOT RECOMMENDED FOR NEW DESIGN
USE AP2132 OR AP7173
PAM3116
Document number: DS36427 Rev. 2 - 3
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August 2017
© Diodes Incorporated
PAM3116
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Parameter
Rating
Unit
Maximum Supply Voltage
6
V
Ambient Temperature Range
-40 to +85
°C
Junction Temperature Range
-40 to +125
Thermal Information
Parameter
Symbol
Package
Max
Unit
Thermal Resistance (Junction to Case)
θJC
SOP-8
11
°C/W
Thermal Resistance (Junction to Ambient)
θJA
SOP-8
90
Internal Power Dissipation
PD
SOP-8
1100
mW
Electrical Characteristics (@TA = +25°C, VIN = VO +1V, CIN = 4.7µF, CO = 4.7µF, unless otherwise specified.)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Input Voltage Range
VIN
2.5
6.0
V
Output Voltage Range
VO
0.8
5
V
ADJ Reference Voltage
VREF
IO = 1mA
0.788
0.8
0.812
V
Output Voltage Accuracy
VO
IO = 1mA
-1.5
1.5
%
Output Current
IO
VO > 0.8V
1500
mA
Output Current Limit
ILIM
VO > 0.8V
1500
2500
mA
Short Circuit Current
ISC
IO = 0mA
700
mA
Dropout Voltage
VDROP
IO = 1.5A
0.8V ≤ VO < 2.5V
1700
mV
VO ≥ 2.5V
300
400
Quiescent Current
IQ
IO = 0mA
90
150
µA
Line Regulation
LNR
IO = 1mA, VIN = VO +1 to VO +2
-0.4
0.4
%/V
Load Regulation
LDR
IO = 1mA to 1500mA
-1.0
0.2
+1.0
%
Temperature Coefficient
TC
40
ppm/°C
Over Temperature Shutdown
OTS
IO = 1mA
150
°C
Over Temperature Hysteresis
OTH
IO = 1mA
40
°C
Power Supply Ripple Rejection
PSRR
IO = 100mA, VO = 1.2mA
f = 100Hz
70
dB
f = 1kHz
65
f = 10kHz
50
Output Noise
Vn
f = 10Hz to 100kHz, IO = 10mA
50
µVRMS
EN Input High Threshold
VEH
VIN = 2.5V to 5V
1.5
V
EN Input Low Threshold
VEL
VIN = 2.5V to 5V
0.3
V
EN Input High Bias Current
IEH
VEN = 5V, VIN = 5V
0.5
µA
EN Input Low Bias Current
IEL
VEN = 0V, VIN = 5V
0.5
µA
Shutdown Current
ISD
VEN = 0V
1
µA
NOT RECOMMENDED FOR NEW DESIGN
USE AP2132 OR AP7173
PAM3116
Document number: DS36427 Rev. 2 - 3
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August 2017
© Diodes Incorporated
PAM3116
Application Information
The PAM3116 family of low-dropout (LDO) regulators have several features that allow them to apply to a wide range of applications. The family
operates with very low input voltage and low dropout voltage (typically 300mV at full load), making it an efficient stand-alone power supply or post
regulator for battery or switch mode power supplies. The 1.5A output current make the PAM3116 family suitable for powering many
microprocessors and FPGA suppl ies. The PAM3116 family also has low output noise (typically 50μVRMS with 4.7μF output capacitor), making it
ideal for use in telecom equipment.
External Capacitor Requirements
A 4.7μF or larger ceramic input bypass capacitor, connected between VIN and GND and located close to the PAM3116, is required for stability. A
4.7µF minimum value capacitor from VO to GND is also required. To improve transient response, noise rejection, and ripple rejection, an additional
1 0μF 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
2.5V is used.
Regulator Protection
The PAM3116 features internal current limiting, thermal protection and short circuit protection. During normal operation, the PAM3116 limits output
current to about 2.5A. 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 down. Once the device has cooled down to approximately +40°C
below the high temp trip point, regulator operation resumes. The short circuit current of the PAM3116 is about 0.7A when its output pin is shorted
to ground.
Thermal Information
The amount of heat that an LDO linear regulator generates is:
IVVP OOIND
All integrated circuits have a maximum allowable junction temperature (TJ(MAX)) above which normal operation is not assured. A system designer
must design the operating environment so that the operating junction temperature (TJ) 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 heat sinks. The
purpose of thi s information is to aid the designer in determining the proper operating environment for a linear regulator that is operating at a
specific power level.
In general, the maximum expected power (PD(MAX)) consumed by a linear regulator is computed as:
Where:
VI(AVG) is the average input voltage.
VO(AVG) is the average output voltage.
IO(AVG) is the average output current.
I(Q) is the quiescent current.
For most LDO regulators, the quiescent current is insignificant compared to the average output current; therefore, the term VI(AVG) xIQ can be
neglected. The operating junction temperature is computed by adding the ambient temperature (TA) 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 RθJC), the case to heatsink (RθCS), and the heatsink to ambient (RθSA). Thermal 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 lowers.
NOT RECOMMENDED FOR NEW DESIGN
USE AP2132 OR AP7173
PAM3116
Document number: DS36427 Rev. 2 - 3
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PAM3116
Application Information (cont.)
Setting the Output Voltage
The internal reference is 0.8V (Typical). The output voltage is calculated as below:
2R1R
1x8.0
VO
The output voltage is given by Table 1.
Table 1: Resistor selection for output voltage setting.
VO
R1
R2
1.2V
56k
110k
1.5V
130k
150k
1.8V
150k
120k
2.5V
215k
100k
3.3V
374k
120k
5.0V
620k
120k
Ordering Information
PAM3116 X X X xxx X
Pin Configuration
B: 8B Type:1. NC
2. VIN
3. EN
4. GND
5. NC
6. ADJ
7. VOUT
8. NC
L: SOP-8 ADJ: Adjustable
(0.8V-5.0V)
Package Type Number of Pins Output Voltage Shipping Package
R: Tape & Reel
Part Number
Output Voltage
Marking
Package Type
Standard Package
PAM3116BLBADJR
Adjustable
P3116
XXXYW
SOP-8
2500 Units/Tape&Reel
NOT RECOMMENDED FOR NEW DESIGN
USE AP2132 OR AP7173
PAM3116
Document number: DS36427 Rev. 2 - 3
10 of 10
www.diodes.com
August 2017
© Diodes Incorporated
PAM3116
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NOT RECOMMENDED FOR NEW DESIGN
USE AP2132 OR AP7173
