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1.5A Low Voltage-Low Dropout CMOS Regulator Key Features
n Low-Dropout Regulator Supports Input Voltages Down to 1.4V n Output Voltage Available in 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V,2.8V,2.85V,3.0V, 3.3V n Stable with a Ceramic Output Capacitor of 1.0uF or Higher n Low Dropout Voltage:150mV @1.5A n Low Quiescent Current n Over Temperature Shutdown n Short Circuit Protection n Low Temperature Coefficient n Standard SOT-223,TO-252 and SOP-8 (Exposed Pad) Packages n Pb-Free Package
PAM3115
General Description
The PAM3115 is a 1.5A CMOS LDO regulator that features a low quiescent current, ultra low input, output and dropout voltages, as well as over temperature shutdown. It is available in SOT-223 , TO-252 and SOP-8(exposed pad) packages. The fixed output voltage of the PAM3115 is set at the factory and trimmed to 2%. The PAM3115 is stable with a ceramic output capacitor of 1.0uF 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 well suited for applications requiring low input and output voltages.
Applications
n DSP, FPGA, and Microprocessor Power Supplies n 1.2V Core Voltage for DSPs n SATA Power Supply n LCD TV/ Monitors n Wireless Devices n Communication Devices n Portable Electronics n Post Regulator for SMPS
Typical Application
R P 10K
V IN
VIN VOUT
VO
PAM3115
C IN 4.7uF
GND
IN
CO 2.2uF
VIN EN C1 4.7uF GND
PAM3115
PWRGD VOUT OUT C2 2.2uF SENSE
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1.5A Low Voltage-Low Dropout CMOS Regulator Block Diagram
IN OUT
IN OUT
PAM3115
OverCurrent Shutdown Thermal Shutdown
OverCurrent Shutdown Thermal Shutdown EN
R1 AMP
AMP
R1
R2
R2
GND
GND
Pin Configuration & Marking Information
Top View SOP-8(EPD) 8 7 6 5
P3115 V F AT Y W
V: Voltage Code F: Internal Code A: Assembly Code T: Testing Code Y: Year W: Weekly
1
2
3
4
Name GND VIN EN GND PWRGD SENSE VOUT GND Function Ground Input Enable Pin Ground Power Good Sense Output Ground
Pin Number 1 2 3 4 5 6 7 8
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1.5A Low Voltage-Low Dropout CMOS Regulator Pin Configuration & Marking Information(continued)
Top View SOT-223 Top View TO-252
PAM3115
P3115 V F AT Y W
P3115 V F AT Y W
V: Voltage Code F: Internal Code A: Assembly Code T: Testing Code Y: Year W: Weekly
1
2
3
Name VIN GND VOUT
1
2
3
Pin Number 1 2 3
Function Input Ground Output
Absolute Maximum Ratings
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 . Input Voltage...............................................4.0V Output Pin Voltage.....................-0.3V to V IN+0.3V Operation Temperature Range........... -40 to 85 Operation Junction Temperature...... -40 to 125 Maximum Output Current......................P D/(V IN-V O) Storage Temperature..................... -65 to 150 Maximum Junction Temperature..................150 Soldering Temperature.......................300, 5sec
Recommended Operating Conditions
Supply Voltage Range.......................1.4V to 3.6V Operation Temperature Range...........-40 to 85 Junction Temperature Range.......... -40 to 125
Thermal Information
Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Symbol JC JA PD Package SOT-223 TO-252 SOT-223 TO-252 SOT-223 TO-252 Maximum 7 7 160 90 625 1200
Unit /W
mW
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1.5A Low Voltage-Low Dropout CMOS Regulator Electrical Characteristic
V IN = V O+0.5V, T A=25 OC, C IN =4.7uF, C O=2.2uF, unless otherwise noted.
Parameters Input Voltage Range Output Voltage Accuracy Symbol VIN VO IO=100mA Vo=0.9V IO=500mA Dropout Voltage VDROP IO=1.5A Vo=1.0V 2.5V>Vo1.2V Vo2.5V Vo=0.9V Vo=1.0V 2.5V>Vo1.2V Vo2.5V Short Circuit Current Quiescent Current Ground Pin Current ISC IQ IGND Vo < 0.3V Io=0mA Io=1mA to 1.5A VO2.5V,Io=10mA Line Regulation LNR VIN =Vo+0.5V to Vo+1.5V VO>2.5V,IO=10mA VIN =3.3V to 3.6V Load Regulation Over Temperature Shutdown Over Temperature Hysteresis Temperature Coefficient Power Supply Ripple Rejection Output Noise LDR OTS OTH TC PSRR Vn IO =100mA, VO=1.5V f=100Hz f=1KHz f=10KHz IO=1mA to 1.5A 0.5 150 50 40 55 55 35 40 uVrms dB 2 %/A ppm/ 0.5 1 %/V Test Conditions MIN Note 1 -2 330 220 50 40 330 220 150 120 1.0 90 150 600 TYP MAX 3.6 2 500 400 200 150 500 400 350 300 A uA uA mV UNITS V %
PAM3115
f=10Hz to 100kHz
Note1: The minimum input voltage (V IN(MIN)) of the PAM3115 is determined by output voltage and dropout voltage. The minimum input voltage is defined as: V IN(MIN)=V O+V drop
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1.5A Low Voltage-Low Dropout CMOS Regulator Typical Performance Characteristics
T A=25C,C IN=4.7uA,Co=2.2uF,unless otherwise noted. 1. Output Voltage vs Input Voltage
1 0.9
PAM3115
Vo = 0 . 9V
1 0.9
Vo=0.9V
Output Voltage(V)
0.8 0.7 0.6 0.5 0.4 0.3 0.8 1.2 1.6 2 2.4 Io=1.5A Io=500mA
Output Voltage(V)
Io=10mA
0.8 0.7 0.6 0.5 0.4 0.3
Io=10mA,TA=85 Io=10mA,TA=25
2.8
3.2
3.6
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
Input Voltage(V)
Input Voltage(V)
Vo=1.5V
1.7 1.5 Io=10mA
1.7 1.5
Vo=1.5V
Output Voltage(V)
1.3 1.1 0.9 0.7 0.5 0.3 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 Input Voltage(V) Io=1.5A Io=500mA
Output Voltage(V)
1.3 1.1 0.9 0.7 0.5 0.3 0.8 1.2 1.6
Io=10mA,TA=25
Io=10mA,TA=85
2
2.4
2.8
3.2
3.6
Input Voltage(V)
3 2.5
Vo=2.5V
3 2.5
Vo=2.5V
Output Voltage(V)
Output Voltage(V)
Io=10mA
2 1.5 Io=500mA 1 0.5 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 Input Voltage(V) Io=1.5A
2 1.5 1 0.5 0.8 1.2 1.6 2
Io=10mA,TA=25
Io=10mA,TA=85
2.4
2.8
3.2
3.6
Input Voltage(V)
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1.5A Low Voltage-Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
2. Output Voltage vs Output Current
0.920 0.915
PAM3115
Vo=0.9V
0.915 0.905
3. Output Voltage vs Temperature Vo=0.9V, V IN=3.3V
Output Voltage(V)
Output Voltage(V)
0.910 0.905 0.900
VIN=3.3V
0.895 0.885 0.875 0.865 0.855 Io=10mA
Io=500mA
VIN=2.5
VIN=1.5V 0.895 0 300 600 900 1200 1500 Output Current(mA)
0
30
60
90
120
150
Temperature()
1.52 1.50
1.512 1.510
Vo=1.5V
Vo=1.5V, V IN=3.3V
Output Voltage(V)
1.508 1.506 1.504 1.502 1.500 1.498 1.496 0 300 600 900 1200 1500 Output Current(mA) VIN=2.0V VIN=2.5V VIN=3.3V
Output Voltage(V)
1.48 1.46 1.44 1.42 1.40 0
Io=10mA
Io=500mA
30
60 90 Temperature()
120
150
2.515 2.510
Vo=2.5V
2.55 2.50
Vo=2.5V, V IN=3.3V
Output Voltage(V)
Voltage(V)
2.505 2.500 2.495 2.490 2.485 2.480 0
VIN=3.6V
2.45 2.40 2.35
Io=10mA
Io=500mA
VIN=3.3V VIN=3.0V
2.30
300
600
900
1200
1500
0
30
Output Current(mA)
60 90 Temperature()
120
150
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1.5A Low Voltage-Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
4. Quiescent Current vs Input Voltage
100
PAM3115
90
5. Quiescent Current vs Temperature
Quiescent Current(uA)
90 80 Io=0mA,TA=25 70 60 50 40 1.8 2.1 2.4 2.7 3 3.3 3.6 Input Voltage(V) Io=0mA,TA=85
Quiescent Current(uA)
85 80 75 70 65 0 30 60 90 120 150 Temperature()
VIN=2.5V VIN=3.3V
6. Ground Current vs Output Current
140
7. Ground Current vs Input Voltage
140
120
VIN=3.3V
Ground Current(uA)
100 80 60 40 20 0 0 300 600 900 1200 1500 Output Current(mA) VIN=2.0V VIN=2.5V
Ground Current(uA)
120 100 80 60 40 20 1.8 2.1 2.4 2.7 3 3.3 3.6 Input Voltage(V) Io=10mA Io=500mA Io=1.5A
8. Dropout Voltage vs Output Current
350 300
9. Dropout Voltage vs Temperature
450 400
Output Current
250 200 150 100 50 0 0 300 600 Vo=2.5V
Dropout Voltage
Vo=0.9V
350 300 250 200 150 100 50 0
Vo=2.5V Vo=1.5V Vo=0.9V
Vo=1.5V
900
1200
1500
0
30
Dropout Voltage(V)
60 90 Temperature()
120
150
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1.5A Low Voltage-Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
10. Ripple Rejection vs Frequency
+0 -10 -20 -30 d B -40
PAM3115
11. Load Transient Response
Vo AC Coupling
Io=500mA
-50 -60 -70
Io=100mA
Io=1mA
-80 10 20 50 100 200 500 1k Hz 2k 5k 10k 20k 50k 100k
Io DC Coupling
Vo=0.9V,V IN=2.5V,Vpp=1V
Vo=1.5V, V IN=3.3V, Io=10mA to 1.5A
+0 -10 -20 -30 d B -40 -50 -60 -70 -80 10
Vo AC Coupling
Io=500mA Io=1mA
Io=100mA
Io DC Coupling
1k Hz 2k 5k 10k 20k 50k 100k
20
50
100
200
500
Vo=1.5V,V IN=2.5V,Vpp=1V
Vo=1.5V , V IN=3.3V, Io=10mA to 500mA
+0 -10 -20 -30 d B
Vo AC Coupling
Io=500mA
-40 -50 -60
Io=1mA
Io=100mA
-70 -80 10
Io DC Coupling
500 1k Hz 2k 5k 10k 20k 50k 100k
20
50
100
200
Vo=2.5V,V IN=3.3V,Vpp=0.3V
Vo=1.5V , V IN=3.3V, Io=500mA to 1.5A
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1.5A Low Voltage-Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
12. Line Transient Response
PAM3115
V IN DC Coupling
Vo AC Coupling
Vo=1.5V, V IN=2V to 3.3V, Io=1mA
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1.5A Low Voltage-Low Dropout CMOS Regulator Application Information
T h e PA M 3 11 5 f a m i l y o f l o w - d r o p o u t ( L D O ) regulators have several features that allow them to apply to a wide range of applications. The family operates with very low input voltage (1.4V) and low dropout voltage (typically 150mV 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 PAM3115 family suitable for powering many microprocessors and FPGA supplies. The PAM3115 family also has low output noise (typically 40VRMS with 2.2F output capacitor), making it ideal for use in telecom equipment. External Capacitor Requirements A 2.2F or larger ceramic input bypass capacitor, connected between V IN and GND and located close to the PAM3115, is required for stability. A 1.0uF minimum value capacitor from V O to GND is also required. To improve transient response, noise rejection, and ripple rejection, an additional 10F 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 1.4 V is used. Regulator Protection The PAM3115 features internal current limiting, thermal protection and short circuit protection. During normal operation, the PAM3115 limits output current to about 3A. 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 150C, thermalprotection circuitry will shut down. Once the device has cooled down to approximately 50C below the high temp trip point, regulator operation resumes. The short circuit current of the PAM3115 is about 1A when its output pin is shorted to ground. Thermal Information The amount of heat that an LDO linear regulator generates is: P D=(V IN-V O)I O. All integrated circuits have a maximum allowable junction temperature (T J max) above which normal operation is not assured. A system designer must design the operating environment so that the operating junction temperature (T J) does not exceed the maximum junction temperature (T J max). The two main environmental variables that a designer can use to improve thermal performance are air flow and external heatsinks. The purpose of this 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 D(max)) consumed by a linear regulator is computed as:
PAM3115
PDMAX= (VI (avg)-VO (avg))xIO (avg)+VI (avg)xI (Q ) (1)
l l l l
Where: V I (avg) is the average input voltage. V O(avg) is the average output voltage. I O(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 V I(avg) xI (Q) can be neglected. The operating junction temperature is computed by adding the ambient temperature (T A) 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 ( R JC), the case to heatsink (R CS), and t h e h e a t s i n k t o a m b i e n t ( R SA) . T h e r m a l 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 lower.
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1.5A Low Voltage-Low Dropout CMOS Regulator Ordering Information
PAM3115
PAM3115
XXXX
Output Voltage Number of Pins Package Type Pin Configuration
Pin Configuration A Type 1. VIN 2. GND 3. VOUT B Type 1. GND 2. VIN 3. EN 4. GND 5. PWRGD 6. SENSE 7. VOUT 8.GND
Package Type B: SOT-223 L: TO-252 E: SOP-8
Number of Pins A: 3 C: 8
Output Voltage 090: 0.9V 100: 1.0V 120: 1.2V 150: 1.5V 180: 1.8V 250: 2.5V 280: 2.8V 285: 2.85V 300: 3.0V 330: 3.3V
Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and package type availability .
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1.5A Low Voltage-Low Dropout CMOS Regulator Ordering Information
Part Number PAM3115ABA090 PAM3115ALA090 PAM3115BEC090 PAM3115ABA100 PAM3115ALA100 PAM3115BEC100 PAM3115ABA120 PAM3115ALA120 PAM3115BEC120 PAM3115ABA150 PAM3115ALA150 PAM3115BEC150 PAM3115ABA180 PAM3115ALA180 PAM3115BEC180 PAM3115ABA250 PAM3115ALA250 PAM3115BEC250 Output Voltage 0.9V 0.9V 0.9V 1.0V 1.0V 1.0V 1.2V 1.2V 1.2V 1.5V 1.5V 1.5V 1.8V 1.8V 1.8V 2.5V 2.5V 2.5V Marking P3115Z FATYW P3115Z FATYW P3115Z FATYW P3115Y FATYW P3115Y FATYW P3115Y FATYW P3115B FATYW P3115B FATYW P3115B FATYW P3115C FATYW P3115C FATYW P3115C FATYW P3115E FATYW P3115E FATYW P3115E FATYW P3115G FATYW P3115G FATYW P3115G FATYW Package Type SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 Standard Package
PAM3115
3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel
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1.5A Low Voltage-Low Dropout CMOS Regulator Ordering Information(continued)
Part Number PAM3115ABA280 PAM3115ALA280 PAM3115BEC280 PAM3115ABA285 PAM3115ALA285 PAM3115BEC285 PAM3115ABA300 PAM3115ALA300 PAM3115BEC300 PAM3115ABA330 PAM3115ALA330 PAM3115BEC330 Output Voltage 2.8V 2.8V 2.8V 2.85V 2.85V 2.85V 3.0V 3.0V 3.0V 3.3V 3.3V 3.3V Marking P3115H FATYW P3115H FATYW P3115H FATYW P3115I FATYW P3115I FATYW P3115I FATYW P3115J FATYW P3115J FATYW P3115J FATYW P3115K FATYW P3115K FATYW P3115K FATYW Package Type SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 SOT-223 TO-252 SOP-8 Standard Package
PAM3115
3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel 3,000Units/Tape&Reel 2,500Units/Tape&Reel 2,500Units/Tape&Reel
Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and package type availability .
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1.5A Low Voltage-Low Dropout CMOS Regulator Outline Dimension
SOP-8
PAM3115
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1.5A Low Voltage-Low Dropout CMOS Regulator Outline Dimension SOT-223
C
PAM3115
l
J 1
Dimensions(Millimeter) Symbol MIN NOM MAX A 6.70 7.00 7.30 C 2.90 3.00 3.10 D 0.02 0.06 0.10 E 0 5 10 I 0.60 0.70 0.80 H 0.25 0.30 0.35 B 13 TYP J 2.30 REF. 1 6.30 6.50 6.70 2 6.30 6.50 6.70 3 3.30 3.50 3.70 4 3.30 3.50 3.70 5 1.40 1.60 1.80
3
A
B
H
5
D
E 4
2
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1.5A Low Voltage-Low Dropout CMOS Regulator Outline Dimension To-252
A B
PAM3115
F S G E
Dimensions(Millimeter) Symbol MIN NOM MAX A 6.40 6.60 6.80 B 5.20 5.35 5.50 C 6.80 7.00 7.20 D 2.20 2.50 2.80 E 2.30 REF. F 0.70 0.80 0.90 S 0.60 0.75 0.90 G 0.50 0.60 0.70 H 2.20 2.30 2.40 J 0.45 0.50 0.55 K 0 0.07 0.15 L 0.90 1.20 1.50 M 5.40 5.60 5.80 R 0.80 1.00 1.20
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R D
M
C
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