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0.5A 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 :50mV@ 0.5A n Low Quiescent Current n Over Temperature Shutdown n Low Temperature Coefficient n Pb-Free Package
PAM3105
General Description
The PAM3105 is a 0.5A 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 a SOT-89 package. The fixed output voltage of the PAM3105 is set at the factory and trimmed to 2.0%. The device 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 LCD TV/ Monitors n Wireless Devices n Communication Devices n Portable Electronics n Post Regulator for SMPS
Typical Application
VIN
VIN VOUT
Block Diagram
VOUT
VIN
VOUT
PAM3105
C IN 4.7uF
GND
CO 2.2uF
Thermal Shutdown
R1 AMP
R2
GND
Power Analog Microelectronics , Inc
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0.5A Low Voltage- Low Dropout CMOS Regulator Pin Configuration & Marking Information
Top View SOT-89-3
PAM3105
P3105 V XAT Y W
1 2 3
Name GND VIN VOUT
V: Voltage Code X: Internal Code A: Assembly Code T: Testing Code Y:Year W: Weekly
Pin Number 1 2 3
Function Ground Input 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 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-89-3 SOT-89-3 SOT-89-3 Maximum 50 /W 180 550 mW Unit
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0.5A 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=50mA Vo=0.9V IO=100mA Dropout Voltage VDROP IO=500mA Vo=1.0V 2.5V>Vo1.2V Vo2.5V Vo=0.9V Vo=1.0V 2.5V>Vo1.2V Vo2.5V Quiescent Current Ground Pin Current IQ IGND Io=0mA Io=1mA to 500mA 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 f=100Hz PSRR Vn Io=100mA, Vo=0.9V f=1KHz f=10KHz f=10Hz to 100kHz Io=1mA to 500mA, VIN =Vo+0.5V 0.2 150 50 40 65 60 40 40 uVrms dB 1.5 % ppm/ 0.1 1 %/V Test Conditions MIN Note 1 -2 330 220 20 10 330 220 50 40 90 95 TYP MAX 3.6 2 450 350 150 100 500 400 200 150 150 300 uA uA mV UNITS V %
PAM3105
Note1: The minimum input voltage (V IN(MIN)) of the PAM3105 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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0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics
T A=25 OC, C IN =4.7uF, C O=2.2uF, unless otherwise noted. 1. Output Voltage vs Input Voltage
0.95 0.9
PAM3105
Vo=0.9V
0.95
2. Output Voltage vs Output Current Vo=0.9V
Output Voltage(V)
0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.8 1.2 1.6 2 2.4 2.8 Input Voltage(V) 3.2 3.6 Io=200mA Io=500mA Io=1mA
Output Voltage(V)
0.85
0.925 VIN=2.5V 0.9 VIN=3.6V
0.875 VIN=1.4V 0.85 0 100 200 300 400 500 Output Current(mA)
Vo=1.8V
1.9 1.8
Vo=1.8V
1.84 1.82 VIN=3.6V
Output Voltage(V)
Output Voltage(V)
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 Input Voltage(V) Io=200mA Io=500mA Io=1mA
1.8 1.78 1.76 1.74 1.72 1.7 0 100 200 300 400 500 Output Current(mA) VIN=3V VIN=2.2V
3.5 3.3
Vo=3.3V
3.35 3.33
Vo=3.3V
Output Voltage(V)
3.1 2.9 2.7 2.5 2.3 2.1 2.2 2.5 2.8 3.1 3.4 3.7 4 Input voltage(V) Io=200mA Io=500mA Io=1mA
Output voltage(V)
VIN=3.5V 3.31 3.29 3.27 3.25 0 100 200 300 400 500 Output Current(mA) VIN=3.6V
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0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
3. Output Voltage vs Temperature
0.92 0.91
PAM3105
Vo=0.9V
450 400
4. Dropout Voltage vs Output Current Vo=0.9V
Output Voltage(V)
VIN=2V,Io=10mA 0.9 0.89 0.88 0.87 0.86 25 50 75 Temperature() 100 125 VIN=2V,Io=200mA
Dropout Voltage(mV)
350 300 250 200 150 100 0 100 200 300 400 500 Output Current(mA)
70 60
Vo=1.8V
1.84 VIN=3V,Io=200mA 1.82
Vo=1.8V
Dropout Voltage(mV)
Output Voltage(V)
1.8 1.78 1.76 1.74 1.72 1.7 25 50 75 Temperature()
3.32 3.3
50 40 30 20 10 0
VIN=3V,Io=10mA
100
125
0
100
200
300
400
500
Output Current(mA)
Vo=3.3V
70 60
VIN=3.6V,Io=10mA
Vo=3.3V
Dropout voltage(mV)
Output Voltage(V)
3.28 3.26 VIN=3.6V,Io=200mA 3.24 3.22 3.2 25 50 75 Temperature() 100 125
50 40 30 20 10 0 0 100 200 300 400 500 Output Current(mA)
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0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
5. Dropout Voltage vs Temperature
70
PAM3105
Dropout Voltage @ 500mA(mV)
60 50 40 30 20 10 0 25 50 75 Temptrature() 100 125
140
6. Quiescent Current vs Input Voltage Vo=0.9V
Quiescient Current(uA)
120 100 80 60 40 20 0 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 Input Voltage(V)
Vo=1.8V
Vo=3.3V
120
Vo=1.8V
Quiescent current(uA)
180 160 140 120 100 80 60 40
Vo=3.3V
Quiescient Current(uA)
110 100 90 80 70 60 50 1.8 2.1 2.4 2.7 3 3.3 3.6
Io=0mA
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
Input Voltage(V)
Input voltage(V)
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0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
7. Ground Current vs Input voltage Vo=0.9V 8. Ground Current vs Output Current Vo=0.9V
PAM3105
140 120
140 130
Ground Current(uA)
Ground Current(uA)
120 110 100 90 80 70 60
100 Io=500mA 80 60 40 20 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 Input Voltage(V) Io=200mA Io=1mA
VIN=3.6V VIN=2.5V VIN=3.3V
0 100 200 300 400 500
Output Current(mA)
Vo=1.8V
120 110 120 110 Io=200mA Io=500mA
Vo=1.8V
VIN=3.6V
Ground Current(uA)
100 90 80 70 60 50 1.8
Ground Current(uA)
100 90 80 70 60 50 VIN=2.2V VIN=3V
Io=1mA
2.1
2.4
2.7
3
3.3
3.6
0
100
200
300
400
500
Input Voltage(V)
Output Current(mA)
Vo=3.3V
350 300
150 140
Vo=3.3V
VIN=3.6V
Ground Current(uA)
Ground Current(uA)
250 Io=500mA 200 Io=200mA 150 100 50 3.2 3.3 Io=1mA 3.4 Input Voltage(V) 3.5 3.6
130 120 110 100 90 80 0 100 200 300 400 500 Output Current(mA) VIN=3.5V
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0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics(continued)
9. Load Transient Response 10. Line Transient Response
PAM3105
Io DC Coupling Vo AC Coupling
Vin DC Coupling
Vo AC Coupling
Io=1mA to 500mA,Vo=1.8V,V IN=3.3V
V IN=2.2V to 3.6V,Vo=1.8V,I O=1mA
Audio Precision
11. Power Supply Ripple Rejection
+0 -10 -20 -30
Io DC Coupling Vo AC Coupling
d -40 B -50 -60 -70
Io=500mA Io=100mA
Io=1mA
-80 10 20 50 100 200 500 1k Hz 2k 5k 10k 20k 50k 100k
Io=1mA to 100mA,Vo=1.8V, V IN=3.3V
Vo=0.9V
Io DC Coupling Vo AC Coupling
Io=100mA to 500mA,Vo=1.8V, V IN=3.3V
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0.5A Low Voltage- Low Dropout CMOS Regulator Application Information
T h e PA M 3 1 0 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 50mV at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode power supplies. The 0.5A output current makes the PAM3105 family suitable for powering many microprocessors. The PAM3105 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 VIN and GND and located close to the PAM3105, is required for stability. A 1.0uF minimum value capacitor from VOUT 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 PAM3105 features internal current limiting and thermal protection. During normal operation, the PAM3105 limits output current to approximately 1A. 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, thermal-protection circuitry will shut it down. Once the device has cooled down to approximately 50C below the high temp trip point, regulator operation resumes. Thermal Information The amount of heat that an LDO linear regulator generates is: Power=(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 (TJ 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:
PAM3105
PDMAX= (VI (avg)-VO (avg))xIO (avg)+VI (avg)xI (Q )
(1) Where: l V I (avg) is the average input voltage. l V O(avg) is the average output voltage. l I O(avg) is the average output current. l 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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0.5A Low Voltage- Low Dropout CMOS Regulator Ordering Information
PAM3105
PAM3105 X X X X
Output Voltage Number of Pins Package Type Pin Configuration
Pin Configuration A Type 1. GND 2. VIN 3. VOUT Package Type CSOT-89 Number of Pins A: 3 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 .
Power Analog Microelectronics , Inc
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0.5A Low Voltage- Low Dropout CMOS Regulator Ordering Information
Part Number PAM3105ACA090 PAM3105ACA100 PAM3105ACA120 PAM3105ACA150 PAM3105ACA180 PAM3105ACA250 PAM3105ACA280 PAM3105ACA285 PAM3105ACA300 PAM3105ACA330 Output Voltage 0.9V 1.0V 1.2V 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.3V Marking P3105Z XATYW P3105Y XATYW P3105B XATYW P3105C XATYW P3105E XATYW P3105G XATYW P3105H XATYW P3105I XATYW P3105J XATYW P3105K XATYW Package Type SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 Standard Package 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel 1,000Units/Tape &Reel
PAM3105
Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and package type availability .
Power Analog Microelectronics , Inc
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0.5A Low Voltage- Low Dropout CMOS Regulator Outline Dimension
SOT - 89 - 3
4 . 5 0 . 05 1 . 650 REF 1 . 400 REF 1 . 50 0 . 05
PAM3105
4 . 20 0 . 05
2 . 5 0 . 05
1 . 00 0 . 07 1 . 50 3 . 00 0 . 025 6'-2X 1 . 50
6' 0 . 46 0 . 025 0 . 38 0 . 01
6'-2X
( Unit : mm )
B
Do
Po
P2
E F W
T
Ko
A
A
12 ' Max
8 ' Max Ao
A - A SECTION
Symbol Ao Bo Ko Spec 4.850.1 4.450.1 1.850.1 Symbol E F Do Spec P1 P2 T 8.00.10 2.00.05 0.2540.02 W 10Po 12.0+0.3 1.750.1 5.50.05 1.500.10 1.50.25 40.00.2 -0.1 Po 4.00.1 D1
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B
P1
D1
B - B SECTION
Bo

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