PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Features General Description n Maximum 1.5A Low-Dropout Voltage Regulator n High Accuracy Output Voltage ±1.5% n Typically 150mV Dropout at 1.5A n Power Good Output n Output Voltage Pull Low Resistance when Disable n Thermal and Over Current Protection n RoHS Compliant and 100% Lead (Pb)-Free The PAM3108 is a high performance positive voltage regulator designed for use in applications requiring very low Input voltage and very low dropout voltage at up to 1.5A. It operates with a VIN as low as 1.1V and VDD voltage 3V with output v o l t a g e p r og r a m m a bl e a s l o w a s 0 . 8 V. T he significant feature includes ultra low dropout, ideal for applications where VOUT is very close to VIN. Ad ditionally, there is an enable pin to further reduce power dissipation while shutdown. The PAM3108 provides excellent regulation over variations in line, load and temperature. and provides a power OK signal to indicate if the voltage level of Vo reaches 90% of its rating value. Applications n Front Side Bus VTT (1.2V/1.5A) n NoteBook PC Applications n Motherboard Applications The PAM3108 is available with SOP-8 (Exposed Pad) and WDFN-10L 3x3 packages . Typical Application 100k VIN VI N VOUT VOUT 10uF PAM3108 0 CTRL C1 R1 CTRL ON 1uF 0 OFF 10uF ADJ R2 EN 0 0 0 VO =0.8V*(1+R1/R2) Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 1 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Block Diagram VIN VOUT OCP Driver OTP EN POR ADJ CRTL 0.8V POK 0.72V GND Pin Configuration & Marking Information Top View SOP-8(EP) POK 1 TOP VIEW WDFN-10L 3x3 8 7 EN 2 VIN 3 6 CTRL 4 GND ADJ VOUT VOUT 1 VOUT 2 P3108 XXXYW 10 CRTL 9 VIN 8 VOUT ADJ 3 4 7 VIN VIN POK 5 6 EN 5 NC GND (Exposed Pad) GND (Exposed Pad) X: Internal Code Y: Year W: Week Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 2 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Pin Descriptions Pin No. SO P-8(EP) WDFN 3x3 Pin Name Pin Function 3 2 7, 8, 9 6 VIN EN 4 10 CTRL Supply Voltage of Control Circuitry. 1 5 POK Power Good Open Drain Output. 7 4 ADJ Set the output voltage by the feedback resistors. VO =0.8V x (R1 + R2)/R2. 6 1, 2, 3 -- 5 8, Exposed Pad (11) Exposed Pad (9) VOUT NC GN D Supply Input Voltage. Chip Enable (Active-High). Output Voltage. No Int ernal Connection. Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum powe r dissipation. 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 VIN, CTRL..............................6.0V Output Current ......................................... 1.5A Output Pin Voltage ............GND-0.3V to V IN+0.3V Lead Soldering Temperature (5sec)....... .... 260 °C Storage Temperature .................-65 °C to 150 °C ESD Rating ............................................ Class B Recommended Operating Conditions Max. Supply Voltage.....................................5.5V Junction Temperature.................-40 °C to 125 °C Operation Temperature..................-40 °C to 85 °C Thermal Information Parameter Symbo l Package Maximum Thermal Resis tance (Junction to Ambient) θJA WDFN 3x3-10 60 SOP-8(EP) 90 Thermal Resis tance (Junction to Case) θJC WDFN 3x3-10 8.5 SOP-8(EP) 11 Internal Power Dissipation(@TA=25°C) PD WDFN 3x3-10 1600 SOP-8(EP) 1100 Unit °C/W °C/W mW Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 3 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Electrical Characteristic V IN =V O +0.5V, V CTRL=V EN=5V,T A =25 °C , C IN =C O =10 μF, unless otherwise noted. PARAMETER VIN Input Voltage CTRL Input Voltage Quiescent Current CTRL Input Current in Shutdown CTRL Input Current in Shutdown Output Voltage Accuracy Current Limit Short Current Feedback Voltage Feedback Leakag e Current SYMBOL VIN VCTRL VTH_CTRL VTH_VIN VYHS_CTRL VYHS_VIN IQ ISD_CTRL ISD_VIN Vo IO ISHORT VREF IREF Dropout Voltage Vdrop Line Regulation Load Regulation VOUT Pull Low Resis tor Temperatu re Coefficient Over Temperature Shutdown Over Temperature Hystere sis LNR LDR RPL Tc OTS OTH Power Sup ply Ripple Rejection PSRR EN Bias Current EN Input High Threshold EN Input Low Threshold POK Threshold Voltage POK Hysteresis POK Pull_Low Voltage IEN VIH VIL VTH_OK POK Delay Time TDelay POR Threshold POR Hysteresis Test Conditions VOUT =VREF Io= 0mA VEN =0V VEN=0V Io=1mA to 1.5A VO=0V VO =VREF IO=1A IO=1.5A Io=1mA, VIN = VO +0.5V to 5.5V VIN=VO+1V, Io=1mA to 1.5A VEN=0V Io=1mA Io= 1mA Io= 1mA f=100Hz Vpp=200mV f=1kHz VEN=VCTRL=5V VIN=2.5V to 5V VIN=2.5V to 5V VREF Rising POK sinks 5mA Current From VREF=VTH _O K to rising edge of the VPOK MIN 1.1 3 2.5 0.8 TYP 2.7 0.9 0.4 0.5 0.5 5 -0.15 -2 3 1 0.8 100 150 0.1 0.2 100 40 170 40 65 60 5 1.2 0.812 20 1 mA uA uA % A A V nA mV 0.15 2 %/V % Ω ppm/℃ ℃ ℃ dB 10 0.2 0.4 uA V V % % V 2 4 mS 1.5 90 3 UNITS V V V 1 1.5 -1.5 0.788 MAX 5.5 5.5 0.3 94 Note 1: Output current is limited by P D, maximum I O=P D/( V IN(MAX)-V O). Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 4 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Typical Performance Characteristics T A=25 °C , C IN=C O=10 μF, unless otherwise noted. 1. Load Transient Response 2. Load Transient Response Iout Iout Vout Vout Vctrl=5V,Vin=1.8V,Vo=1.2V,Io=0.1~1A Vctrl=5V,Vin=1.8V,Vo=1.2V,Io=0.1~1.5A 3 Line Transient Response 4. Line Transient Response VIN Vctrl Vout Vout Vctrl=4~5V,Vin=2V,Vo=1.2V,Io=100mA Vctrl=5V,Vin=2~3V,Vo=1.2V,Io=100mA 5. Start Up from VIN 6. Start Up from CTRL VIN Vctrl VOUT VOUT PGOOD PGOOD Vctrl=5V,Vin=2V,Vo=1.2V,Io=1.5A Vctrl=5V,Vin=2V,Vo=1.2V,Io=1.5A Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 5 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Typical Performance Characteristics T A=25 °C , C IN=C O=10 μF, unless otherwise noted. 7. Start Up from EN 8. Dropout Voltage VS Load Current 160 140 120 EN 100 80 VOUT 60 PGOOD 40 20 0 0 0.3 0.6 Vctrl=5V,Vin=2V,Ven=0~2V,Vo=1.2V,Io=1.5A 0.9 1.2 1.5 Load Current(A) 9. Output Voltage VS Load Current 10. Output Voltage VS Temperature 1.16 1.16 1.15 1.155 1.15 1.14 1.145 1.13 1.14 1.135 1.12 1.13 1.11 Vin=1 .8V 1.125 Vin=2 .5V 1.12 1.1 0 500 1000 Load C urrent(mA) 0 1500 50 100 150 200 Temperature(℃) Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 6 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Application Information Capacitor Selection and Regulator Stability r e s u me s op e r a t i on a ft e r t he j u n c ti o n temperature drops below 130°C. Similar to any low dropout regulator, the external capacitors used with the PAM3108 must be carefully selected for regulator stability and performance. For continuous operation, the junction temperature should be maintained below 125°C. The power dissipation is defined as: A capacitor C IN of more than 10µF 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 PAM3108 should not exceed 0.5 inch. Ceramic c a p ac it o r s a r e s ui t a bl e f or t h e PA M 3 10 8 . Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response. P D = (V IN -V OUT )*I O +V IN *IGND 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: P D(MAX) = (TJ(MAX) -TA )/θJA The PAM3108 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 > 10µF with ESR>5mΩ ensures stability. Where T J(MAX) is the maximum allowable junction t e m p e r a t u r e 1 2 5 °C , T A i s t h e a m b i e n t temperature and θJA is the thermal resistance from the junction to the ambient. Shutdown Input Operation The PAM3108 is shut down by pulling the EN input low, and is turned on by tying the EN input to CTRL or leaving the EN input floating. Input-Output ( Dropout ) Voltage A regulator's minimum input-output voltage difference (or dropout voltage) determines the lowest usable supply voltage. The PAM3108 has a typical 150mV dropout voltage. Current Limit and Short Circuit Protection The PAM3108 features a current limit, which monitors and controls the gate voltage of the pass transistor. The output current can be limited to 3A by regulating the gate voltage. The PAM3108 also has a built-in short circuit current limit. Thermal considerations Thermal protection limits power dissipation in the PA M 3 1 0 8 . W h e n th e j u n c t i o n t e m p e r a t u r e exceeds 170°C, the OTP (Over Temperature Protection) starts the thermal shutdown and turns the pass transistor off. The pass transistor Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 7 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Ordering Information PAM 3108 X X X xxx X Shipping Package Output Voltage Number of Pins Package Type Pin Configuration Pin Con figu ration A Type Package Type Number of Pins Output Voltage J: WDFN 3x3 E: 10 ADJ: Adj E: SOP-8(EP) C: 8 ADJ: Adj 10 pins B Type 8 pins Part Number PAM3108AJEADJR PAM3108BECADJR Output Voltage ADJ ADJ Package Type WDFN3x3-10 SOP-8(EP) Shipping Package 3,000 Units/Tape & Reel 2,500 Units/Tape & Reel Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 8 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Outline Dimension SOP-8(EP) Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 9 PAM3108 Maximum 1.5A, Ultra Low Dropout Regulator Outline Dimensions 3x3 mm WDFN 10 Power Analog Microelectronics, Inc www.poweranalog.com 07/2011 Rev1.0 10