PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Features General Description n Low Dropout Voltage: 180mV@ 300mA ( V O= 3.3V) n Accuracy within ±2% n Quiescent Current: 65 μ A Typ. n High PSRR: 67dB@100Hz n Excellent Line/Load Regulation n Fast Response n Current Limiting n Short Circuit Protection n Low Temperature Coefficient n Shutdown Current: 0.5 μ A n Thermal Shutdown n Space Saving Packages SOT2 3-5 and SC70-5 n Pb-Free Package The PAM3103 is a positive, adjustable linear regulator. It features low quiescent current (65 μ A Typ.) and low dropout voltage, making it ideal for battery powered applications. The output voltage is adjustable from 1.2V through 5V. Its high PSRR makes it useful in applications that require AC noise suppression on the input power supply. Space-saving SOT23-5 and SC70-5 packages 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. It is stable with an output capacitor of 2.2 μ F or greater. Applications n n n n n n n Cordless Phone Cellular Phone Bluetooth Earphone Digital Camera Portable Electronics WLAN M P 3 Player Typical Application Block Diagram VIN IN 1 VIN VOUT VOUT OUT 5 PAM3103 3 EN GND C IN 1μF ADJ 4 R1 CC OverCurrent Shutdown 100pF 2 R2 CO 2.2 μ F EN Thermal Protection ADJ Error Amp Reference V O= V REF* ( R1 + R2 ) /R2 GND Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 1 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Pin Configuration & Marking Information Top View SOT23-5 5 Top View SC70-5 4 5 1 2 AC: V: Y: W: ACVYW ACVYW 1 4 2 3 Product Code of PAM3101 Voltage Code Year Week 3 Pin Number 1 2 3 4 5 Name VIN GND EN ADJ VOUT Function Input Ground Chip Enable (Active High) Adjustable Pin 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 ............................................... 6.6V Output Current ......................................... 300mA Output Pin Voltage ................ GND-0.3 to V IN+0.3V Lead Soldering Temperature(5sec) ............ 300°C Storage Temperature ....................- 65 °C to 150 °C Recommended Operating Conditions Max. Supply Voltage (for Max. duration of 30 minutes)................................................6.4V Junction Temperature ..................- 40 °C to 125 °C Ambient Temperature .....................- 40 °C to 85 °C Thermal Information Parameter Symbol Thermal Resistance (Junction to Case) θJC Thermal Resistance (Junction to Ambient) θJA Internal Power Dissipation PD Package Maximum SOT23-5 130 SC70-5 TBD SOT23-5 250 SC70-5 300 SOT23-5 400 SC70-5 300 Unit °C/W °C/W mW Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 2 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Electrical Characteristic T A= 25 °C, V IN= 4V, V O=3V, C IN= 1 μ F, C O= 2.2 μ F, unless otherwise noted. PARAMETER SYMBOL Test Conditions MIN TYP MAX UNITS Input Voltage V IN Note 1 5.5 V Output Voltage VO 1.2 5 V Reference Voltage VREF Output Voltage Accuracy VO Output Current IO Short Circuit Current ISC Dropout Voltage Ground Current Quiescent Current 1.235 IO=1mA Rejection mA 180 230 IO=1mA to 300mA 70 90 μA IO=0mA 65 90 μA -0.4 0.2 0.4 %/V -1 0.2 1 % IGND IO=1mA to 300mA Power Supply Ripple mA Vo≥3.3V LDR Hysteresis Note 2 450 Load Regulation Over Temperature 300 370 IO=1mA, V IN =3Vto 5V Shutdown % 2.5V≤Vo<3.3V IO =300mA LNR Over Temperature 2 150 Line Regulation Temperature Coefficient -2 Vo=0V Vdrop IQ V Tc mV O 40 ppm/ C OTS IO=1mA 150 O OTH IO=1mA 30 O f=100Hz 67 dB f=1kHz 65 dB f=10kHz 42 dB 50 μVrms PSRR Io=100mA, Vo=1.2V Output Noise Vn f =10Hz to 100kHz EN Input High Threshold V IH V IN =2.5V to 5V EN Input Low Threshold V IL V IN =2.5V to 5V Shutdown Current ISD V EN=0V C C 1.5 V 0.01 0.3 V 1 μA Note1: The minimum input voltage ( V IN(MIN)) of the PAM3103 is determined by output voltage and dropout voltage. The minimum input voltage is defined as : V IN(MIN)=V O+V drop Note 2: Output current is limited by P D, maximum I O=P D/( V IN(MAX)-V O). Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 3 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Typical Performance Characteristics T A= 25 °C, V O=1.2V, C IN= 1 μ F, C O= 2.2 μ F, unless otherwise noted. 1.25 1. Output Voltage vs Input Voltage 1.2 1.2 1.15 1.1 Output Voltage(V) Output Voltage (V) 2. Output Voltage vs Output Current 1.205 IO=300mA 1.05 IO=150mA 1 0.95 0.9 V IN=3V 1.195 1.19 V IN=4V 1.185 IO=1mA V IN=5V 1.18 0.85 1.175 0.8 2 3 4 5 0 6 50 100 Input Voltage(V) 1.195 70 1.19 IO=30mA 1.18 IO=300mA 1.17 50 40 30 20 10 1.16 0 50 100 2 150 3 Temperature(℃) 5. Ground Current vs Temperature 80 78 76 74 72 80 60 IO=150mA 68 0 60 90 120 150 IO=1mA 40 20 30 6 IO=300mA 100 70 0 4 5 Quiescent Current (μA) 6. Ground Current vs Input Voltage 120 Ground Current (μA) Ground Current (μA) 82 300 60 1.165 0 250 4. Quiescent Current vs Input Voltage 80 Input Voltage(V) Output Voltage(V) 3. Output Voltage vs Temperature 1.175 200 Output Current(mA) 1.2 1.185 150 2 3 4 5 6 Input Voltage(V) Temperature(℃) Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 4 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Typical Performance Characteristics (continued) 8. Line Regulation Transient Response 7. Load Regulation Transient Response Vo AC Coupling V IN DC Coupling Io DC Coupling Vo AC Coupling Io=1mA,V IN=3V to 5V I O=1mA to 100mA 9. Power Supply Ripple Rejection +0 -10 Vo AC Coupling I O=100mA -20 -30 d B -40 -50 Io DC Coupling I O=1mA -60 -70 -80 10 20 50 100 200 500 1k 2k 5k 10k 20k 50k100k Hz I O=1mA to 300mA V IN=3V,Vpp=1V Vo AC Coupling Io DC Coupling I O=100mA to 300mA Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 5 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Application Information Capacitor Selection and Regulator Stability Load Transient Considerations Similar to any low dropout regulator, the external capacitors used with the PAM3103 must be carefully selected for regulator stability and performance. C u r v e 7 o f t h e PA M 3 1 0 3 l o a d - t r a n s i e n t response on page 5 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 PAM3103. 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. A capacitor C IN of more than 1μF can be employed in the input pin, while there is no upper limit for the capacitance of C IN. Please note that the distance between C IN and the input pin of the PAM3103 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3103. Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response. Shutdown Input Operation The PAM3103 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. The PAM3103 can be shut down by pulling the EN input low, and turned on by tying the EN input to VIN or leaving the EN input floating. ADJ Output Voltage Programming The PAM3103 features a 0.75 Ω P-Channel MOSFET device as a pass transistor. The PMOS pass transistor enables the PAM3103 to consume only 65 μ A of ground current during low dropout, light-load, or heavy-load operation. This feature increases the battery operation life time. Internal P-Channel Pass Transistor The output voltage of the PAM3103 adjustable regulator is programed by using an external resistor divider as shown in Figure1. The output voltage is calculated as below: V O=V REF(1+R1/R2) Input-Output (Dropout) Voltage Resistor R1 and R2 should be chosen for approximately 7 μ A divider current. Lower value resistors can be used but offer no advantage and waste more power. Higher value should be avoided as leakage current at ADJ pin increase the output voltage error. C C is unnecessary when R1 or R2 <20k Ω . The recommended design procedure is to choose R2=169k Ω to set the divider current at 7 μ A and then calculate R1 as below: A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. The PAM3103 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 PAM3103 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 PAM3103 also has a built-in short circuit current limit. R1=( V O/V REF - 1 )R2 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 6 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Thermal considerations package based on the standard JEDEC 51-3 for a single-layer thermal test board, the maximum power dissipation at T A=25°C can be calculated by following formula: Thermal protection limits power dissipation in the PA M 3 1 0 3 . W h e n t h e j u n c t i o n t e m p e r a t u r e 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. P D(MAX)= (125°C-25°C)/250=0.4W It is also useful to calculate the junction temperature of the PAM3103 under a set of specific conditions. Suppose the input voltage V IN=3.3V, the output current I O=300mA and the case temperature T A =40°C measured by a thermal couple during operation, the power dissipation is defined as: For continuous operation, the junction temperature should be maintained below 125°C. The power dissipation is defined as below: P D= (V IN-V OUT)*I O+V IN*I GND P D=(3.3V-2.8V)*300mA+3.3V*70uA≌150mW 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: And the junction temperature T J can b e calculated as follows: T J = T A+P D*θ JA T J = 40°C+0.15W*250°C/W =40°C+37.5°C =77.5°C<T J(MAX) = 125°C P D(MAX) = (T J(MAX)-T A)/θ JA Where T J(MAX) is the maximum allowable junction temperature 125°C, T A is the ambient temperature and θ JA is the thermal resistance from the junction to the ambient. For this application, T J is lower than the absolute maximum operating junction temperature 125°C, so it is safe to use the PAM3103 in this configuration. For example, as θ JA is 250°C/W for the SOT-23 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 7 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Ordering Information PAM3103 X X X XXX Output Voltage Number of Pins Package Type Pin Configuration Pin Configuration A Type 1. VIN Package Type Number of Pins A: SOT-23 B: 5 Output Voltage ADJ U: SC70 2. GND 3. EN 4. ADJ 5. VOUT Part Number Output Voltage Marking Package Type Standard Package PAM3103AABADJ ADJ ACAYW SOT23-5 3,000Units/Tape&Reel PAM3103AUBADJ ADJ ACAYW SC70-5 3,000Units/Tape&Reel Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 8 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Outline Dimension c (REF.) SOT23-5 0.25 D e1 θ L1 (REF.) A2 A1 A E1 E L REF. REF. A A1 A2 c D E E1 L L1 θ b e e1 Min 0 0.70 2.70 2.60 1.40 0º 0.30 Millimeter Nom 1.10MAX 0.05 1.00 0.12REF. 2.90 2.80 1.60 0.45REF. 0.60REF. 5º 0.40 0.95REF. 1.90REF. Max 0.10 1.295 3.10 3.00 1.80 10º 0.50 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 9 PAM3103 300mA Adjustable High PSRR CMOS Linear Regulator Outline Dimension SC70-5 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 10