A Product Line of Diodes Incorporated PAM3108 MAXIMUM 1.5A, ULTRA LOW DROPOUT REGULATOR Description Pin Assignments 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 voltage programmable as low as 0.8V. The significant feature includes ultra low dropout, ideal for applications where VOUT is very close to VIN. Additionally, there is an enable pin to further reduce power dissipation while shutdown. The PAM3108 provides excellent regulation over variations in line, load, temperature and provides a power OK signal to indicate if the voltage level of Vo reaches 90% of its rating value. The PAM3108 is available with SOP-8 (Exposed Pad) and WDFN10L 3x3 packages. Features • Maximum 1.5A Low-Dropout Voltage Regulator • High Accuracy Output Voltage ±1.5% • Typically 150mV Dropout at 1.5A • Power Good Output • Output Voltage Pull Low Resistance when Disabled • Thermal and Over Current Protection • RoHS Compliant and 100% Lead (Pb)-Free Applications • Front Side Bus VTT (1.2V/1.5A) • NoteBook PC Applications • Motherboard Applications Typical Applications Circuit VO = 0.8V*(1+R1/R2) PAM3108 Document number: DSxxxxx Rev. 1 - 0 1 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Pin Configuration and Description Pin Name VIN EN CTRL POK ADJ VOUT NC GND Pin Number SOP-8(EP) W-DFN3x3-10 3 2 4 1 7 6 5 8, Exposed Pad (9) 7, 8, 9 6 Function Supply Input Voltage. Chip Enable (Active-High). 10 Supply Voltage of ControlCircuitry. 5 Power Good Open Drain Output. 4 Set the output voltage by the feedback resistors. VO = 0.8V x (R1 + R2)/R2. 1, 2, 3 — Exposed Pad (11) Output Voltage. No Internal Connection. Ground. The exposed pad must be soldered to a large PCB and connected to GND formaximum powe r dissipation. Functional Block Diagram PAM3108 Document number: DSxxxxx Rev. 1 - 0 2 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) 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 Input Voltage VIN, CTRL Output Current Output Pin Voltage Lead Soldering Temperature Storage Temperature ESD Rating Rating 6.0 1.5 Unit V A GND -0.3 to VIN +0.3 260, (5sec) -65 to +150 Class B °C °C — V Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Rating Unit Max. Supply Voltage Parameter 5.5 V Junction Temperature -40 to +125 Operation Temperature -40 to +85 °C Thermal Information Parameter Symbol Thermal Resistance Junction to Case) θJC Thermal Resistance (Junction to Ambient) θJA Internal Power Dissipation (@TA = 25°C) PD PAM3108 Document number: DSxxxxx Rev. 1 - 0 Package Max W-DFN3x3-10 8.5 SOP-8(EP) 11 W-DFN3x3-10 60 SOP-8(EP) 90 W-DFN3x3-10 1600 SOP-8(EP) 1100 3 of 11 www.diodes.com Unit °C/W mW October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Electrical Characteristics (@TA = +25°C, VIN = VO +0.5V, VCTRL = VEN = 5V, CIN = CO = 10µF, unless otherwise specified.) Parameter VIN Input Voltage CTRL Input Voltage POR Threshold POR Hysteresis Quiescent Current Symbol VIN Test Conditions VOUT = VREF Min Typ V 5.5 V VCTRL VTH_CTRL 2.5 2.7 VTH_VIN 0.8 0.9 VYHS_CTRL 0.4 VYHS_VIN 0.5 IQ IO = 0mA 0.5 CTRL Input Current in Shutdown ISD_CTRL VEN = 0V 5 CTRL Input Current in Shutdown ISD_VIN VEN = 0V VO Current Limit IO Short Current ISHORT Feedback Voltage VREF Feedback Leakage Current IREF -1.5 IO = 1mA to 1.5A V 1.2 µA µA 1.5 % A 1 VO = 0V 0.788 0.8 IO = 1A 100 IO = 1.5A 150 mA 1 3 VO = VREF Units 5.5 3 Output Voltage Accuracy Max 1.1 A 0.812 V 20 nA Dropout Voltage VDROP Line Regulation LNR IO = 1mA, VIN = VO =0.5V to 5.5V -0.15 0.1 0.15 %/V Load Regulation LDR VIN = VO +1V, IO = 1mA to 1.5A -2.0 +0.2 +2.0 % VOUT Pull Low Resistor RPL VEN = 0V 100 Ω Temperature Coefficient TC IO = 1mA 40 ppm/°C Over Temperature Shutdown OTS IO = 1mA 170 °C Over Temperature Hysteresis OTH IO = 1mA 40 °C 65 60 dB 5 µA Power Supply Ripple Rejection PSRR VPP = 200mV EN Bias Current IEN VEN = VCTRL = 5V EN Input High Threshold VIH VIN = 2.5V to 5V EN Input Low Threshold VIL VIN = 2.5V to 5V POK Threshold Voltage VTH_OK POK Hysteresis POK Pull_Low Voltage POK Delay Time Notes: f = 100Hz f = 1kHz 1.5 3 POK sinks 5mA Current TDELAY V 0.3 V 94 % 10 0.2 0.4 % V 2 4 mS 90 VREF Rising From VREF = VTY_OK to rising edge of the VPOK mV 1 1. Output current is limited by PD, maximum IO = PD/(VIN(MAX) – VO). PAM3108 Document number: DSxxxxx Rev. 1 - 0 4 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Typical Performance Characteristics (@TA = +25°C, CIN = CO = 10µF, unless otherwise specified.) PAM3108 Document number: DSxxxxx Rev. 1 - 0 5 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Typical Performance Characteristics (cont.) (@TA = +25°C, CIN = CO = 10µF, unless otherwise specified.) PAM3108 Document number: DSxxxxx Rev. 1 - 0 6 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Application Information Capacitor Selection and Regulator Stability Similar to any low dropout regulator, the external capacitors used with the PAM3108 must be carefully selected for regulator stability and performance. A capacitor CIN of more than 10μF can be employed in the input pin, while there is no upper limit for the capacitance of CIN. Please note that the distance between CIN and the input pin of the PAM3108 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3108. Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response. 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 ESR5>mΩ ensures stability. 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 PAM3108. When the junct ion temperature exceeds 170°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 130°C. For continuous operation, the junction temperature should be maintained below +125°C. The power dissipation is defined as: PD = (VIN − V OUT ) * IO + VIN * 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: ( ) PD(MAX ) = TJ(MAX ) − T A / θJA Where TJ(MAX) is the maximum allowable junction temperature +125°C, TA is the ambient temperature and is the thermal resistance from the junction to the ambient. PAM3108 Document number: DSxxxxx Rev. 1 - 0 7 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Ordering Information Part Number Output Voltage Package Type Output Voltage PAM3108AJEADJR ADJ W-DFN3x3-10 3000 Units/Tape&Reel PAM3108BECADJR ADJ SOP-8(EP) 2500 Units/Tape&Reel Marking Information PAM3108 Document number: DSxxxxx Rev. 1 - 0 8 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Package Outline Dimensions (All dimensions in mm.) SOP-8(EP) PAM3108 Document number: DSxxxxx Rev. 1 - 0 9 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 Package Outline Dimensions (cont.) (All dimensions in mm.) W-DFN3x3-10 PAM3108 Document number: DSxxxxx Rev. 1 - 0 10 of 11 www.diodes.com October 2012 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3108 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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