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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
Typical Applications Circuit
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PAM3116
1.5A LOW DROPOUT VOLTAGE CMOS REGULATOR
Pin Assignments
Applications
• LCD TV/Monitors
• Set-top Box
• IPhone Charger
• Communication Devices
= 0.8 x (1+R1/R2)
V
OUT
PAM3116
Document number: DSxxxxx Rev. 1 - 0
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Pin Description
Pin Name
VIN 2
EN 3
ADJ 6
VOUT 7
NC
GND
Pin Number
SOP-8
1, 5, 8
4
Supply Input Voltage.
Chip Enable
Set the output voltage by the feedback resistors.
Output Voltage.
No Internal Connection.
Ground
Functional Block Diagram
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PAM3116
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 6.5 V
Output Pin Voltage
EN, ADJ, OUTPUT SENSE Pin Voltage
Maximum Output Current
Storage Temperature -65 to +150 °C
Maximum Junction Temperature 150 °C
Lead Soldering Temperature 300, (5sec) °C
PAM3116
Document number: DSxxxxx Rev. 1 - 0
= +25°C, unless otherwise specified.)
A
-0.3 to V
-0.3 to V
P
/(VIN–VO)
D
+0.3
IN
+0.3
IN
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V
V
—
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PAM3116
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
A
Parameter Rating Unit
Maximum Supply Voltage 6 V
Ambient Temperature Range -40 to +85
Junction Temperature Range -40 to +125
°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 = VO +1V, CIN = 4.7µF, CO = 4.7µF, unless otherwise specified.)
A
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage Range
Output Voltage Range
ADJ Reference Voltage
Output Voltage Accuracy
Output Current
Output Current Limit
Short Circuit Current
Dropout Voltage
Quiescent Current
V
V
V
V
REF
V
I
O
I
LIM
I
SC
DROP
I
Q
Line Regulation LNR
Load Regulation LDR
Temperature Coefficient
T
Over Temperature Shutdown OTS
Over Temperature Hysteresis OTH
Power Supply Ripple Rejection PSRR
Output Noise Vn
EN Input High Threshold
EN Input Low Threshold
EN Input High Bias Current
EN Input Low Bias Current
Shutdown Current
V
EH
V
EL
I
EH
I
EL
I
SD
IN
O
IO = 1mA
IO = 1mA
O
VO > 0.8V
VO > 0.8V
IO = 0mA
IO = 1.5A
IO = 0mA
I
= 1mA, VIN = VO +1 to VO +2
O
I
= 1mA to 1500mA
O
40 ppm/°C
C
I
= 1mA
O
I
= 1mA
O
I
= 100mA, VO = 1.2mA
O
f = 10Hz to 100kHz, I
VIN = 2.5V to 5V
VIN = 2.5V to 5V
VEN = 5V, VIN = 5V
VEN = 0V, VIN = 5V
VEN = 0V
PAM3116
Document number: DSxxxxx Rev. 1 - 0
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SOP-8 11
SOP-8 90
°C/W
SOP-8 1100 mW
2.5 6.0 V
0.8 5 V
0.788 0.8 0.812 V
-1.5 1.5 %
1500 mA
1500 2500 mA
700 mA
0.8V ≤ V
VO ≥ 2.5V
< 2.5V
O
1700
300 400
90 150 µA
-0.4 0.4 %/V
-1.0 0.2 +1.0 %
150 °C
40 °C
f = 100Hz 70
f = 1kHz 65
f = 10kHz 50
= 10mA
O
50
1.5 V
0.3 V
0.5 µA
0.5 µA
1 µA
3 of 10
mV
dB
µV
RMS
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Typical Performance Characteristics (@T
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= +25°C, CIN =2.2µF, CO = 4.7µF, unless otherwise specified.)
A
PAM3116
PAM3116
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Typical Performance Characteristics (cont.) (@T
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PAM3116
= +25°C, CIN =4.7µF, CO = 4.7µF, unless otherwise specified.)
A
PAM3116
Document number: DSxxxxx Rev. 1 - 0
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Typical Performance Characteristics (cont.) (@T
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PAM3116
= +25°C, CIN =4.7µF, CO = 4.7µF, unless otherwise specified.)
A
PAM3116
Document number: DSxxxxx Rev. 1 - 0
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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 V
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:
All integrated circuits have a maximum allowable junction temperature (T
must design the operating environment so that the operating junction temperature (T
). The two main environmental variables that a designer can use to improve thermal performance are air flow and external heat sinks.
(T
J(MAX)
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 (P
Where:
• V
• V
• I
• I
For most LDO regulators, the quiescent current is insignificant compared to the average output current; therefore, the term V
neglected. The operating junction temperature is computed by adding the ambient temperature (T
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 R
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.
()
−=
IVVP
OOIND
is the average input voltage.
I(AVG)
is the average output voltage.
O(AVG)
is the average output current.
O(AVG)
is the quiescent current.
(Q)
PAM3116
Document number: DSxxxxx Rev. 1 - 0
to GND is also required. To improve transient response, noise rejection, and ripple rejection, an
O
) above which normal operation is not assured. A system designer
J(MAX)
) does not exceed the maximum junction temperature
J
) consumed by a linear regulator is computed as:
D(MAX)
xIQ can be
I(AVG)
) and the increase in temperature due to the
A
), the case to heatsink (R
θJC
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), and the heatsink to ambient (R
θCS
). Thermal
θSA
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Application Information (cont.)
Setting the Output Voltage
The internal reference is 0.8V (Typical). The output voltage is calculated as below:
1R
The output voltage is given by Table 1.
V
O
⎛
⎜
⎝
⎞
+=
1x8.0
⎟
2R
⎠
Table 1: Resistor selection for output voltage setting.
V
O
1.2V 56k 110k
1.5V 130k 150k
1.8V 150k 120k
2.5V 215k 100k
3.3V 374k 120k
5.0V 620k 120k
R1 R2
Ordering Information
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PAM3116
Part Number Output Voltage Marking Package Type Standard Package
PAM3116BLBADJR Adjustable
PAM3116
Document number: DSxxxxx Rev. 1 - 0
P3116
XXXYW
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SOP-8 2500 Units/Tape&Reel
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PAM3116
Marking Information
Package Outline Dimensions (All dimensions in mm.)
PAM3116
Document number: DSxxxxx Rev. 1 - 0
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PAM3116
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IMPORTANT NOTICE
LIFE SUPPORT
PAM3116
Document number: DSxxxxx Rev. 1 - 0
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