A Product Line of Diodes Incorporated PAM3103 300mA ADJUSTABLE HIGH PSRR CMOS LINEAR REGULATOR Description Pin Assignments Top View TSOT25 The PAM3103 is a positive, adjustable linear regulator. It features low quiescent current (65µA 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. Spacesaving TSOT25 and SOT353(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 2.2µF or greater. Features Low Dropout Voltage: 180mV@ 300mA ( VO = 3.3V) Accuracy within ±2% Quiescent Current: 65µA Typ. High PSRR: 67dB@100Hz Excellent Line/Load Regulation Fast Response Current Limiting Short Circuit Protection Low Temperature Coefficient Shutdown Current: 0.5µA Thermal Shutdown Space Saving Packages TSOT25 and SOT353(SC70-5) Pb-Free Package Applications Cordless Phone Cellular Phone Bluetooth Earphone Digital Camera Portable Electronics WLAN MP3 Player Typical Applications Circuit VO = VREF*(R1+R2)/R2 PAM3103 Document number: DSxxxxx Rev. 1 - 5 1 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Pin Descriptions Pin Number 1 2 3 4 5 Pin Name VIN GND EN ADJ VOUT Function Input Ground Chip Enable (Active High) Adjustable Pin Output Functional Block Diagram 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 Inout Voltage Output Current Output Pin Voltage Lead Soldering Temperature Storage Temperature PAM3103 Document number: DSxxxxx Rev. 1 - 5 Rating 6.0 300 Unit V mA GND -0.3 to VIN +0.3V 300 -65 to +150 °C °C V 2 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Rating Unit Supply Voltage Range Parameter 2.5 to 5.5 V Junction Temperature -40 to +125 Operation Temperature -40 to +85 °C Thermal Information Parameter Symbol θJC Thermal Resistance Junction to Case) Thermal Resistance (Junction to Ambient) θJA Internal Power Dissipation PD Package Max TSOT25 130 SOT353(SC70-5) TBD TSOT25 250 SOT353(SC70-5) 300 TSOT25 400 SOT353(SC70-5) 300 Unit °C/W mW Electrical Characteristics (@TA = +25°C, VIN = 4V, VO = 3V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.) Parameter Input Voltage Output Voltage Reference Voltage Output Voltage Accuracy Symbol Typ Max Units 5.5 V VO 1.2 5 V 2 % 1.235 VREF VO IO Short Circuit Current ISC Dropout Voltage VDROP Ground Current IGND IQ -2 IO = 1mA 300 V Note 2 150 VO = 0V mA mA 2.5V ≤ VO < 3.3V 370 450 VO ≥ 3.3V 180 230 IO = 1mA to 300mA 70 90 IO = 0mA 65 90 µA -0.4 0.2 0.4 %/V -1 0.2 1 IO = 300mA Line Regulation LNR IO = 1mA, VIN = 3V to 5V Load Regulation LDR IO = 1mA to 300mA Temperature Coefficient Min Note 1 Output Current Quiescent Current Test Conditions VIN TC mV µA % 40 Ppm/°C °C Over Temperature Shutdown OTS IO = 1mA 150 Over Temperature Hysteresis OTH IO = 1mA 30 °C 67 65 42 dB dB dB 50 µVRMS Power Supply Ripple Rejection PSRR IO = 100mA, VO = 1.2V Output Noise VN f = 10Hz to 100kHz EN Input High Threshold VIH VIN 2.5V to 5V EN Input Low Threshold VIL VIN 2.5V to 5V Shutdown Current ISD VEN = 0V Notes: f = 100Hz f = 1kHz f = 10kHz 1.5 V 0.01 0.3 V 1 µA 1. The minimym inout voltage (VIN(MIN) of the PAM3103 is determined by output voltage and dropout voltage. The minimum input voltage is defined as: VIN(MIN) = VO +VDROP VIN(MIN) = 2.5V 2. Output current is limited by PD, maximum IO = PD/(VIN(MAX) – VO). PAM3103 Document number: DSxxxxx Rev. 1 - 5 3 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Typical Performance Characteristics (@TA = +25°C, VO = 1.2V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.) PAM3103 Document number: DSxxxxx Rev. 1 - 5 4 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Typical Performance Characteristics (cont.) PAM3103 Document number: DSxxxxx Rev. 1 - 5 5 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Application Information Capacitor Selection and Regulator Stability Similar to any low dropout regulator, the external capacitors used with the PAM3103 must be carefully selected for regulator stability and performance. A capacitor CIN of more than 1μF 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 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. 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 stabilty. ADJ Output Voltage Programming 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 VREF 1 R1 / R2 Resistor R1 and R2 should be chosen for approximately 7µA 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. CC is unnecessary when R1 or R2 <20kΩ. The recommended design procedure is to choose R2 =169kΩ to set the divider current at 7µA and then calculate R1 as below: R1 V O / VREF 1R2 Load Transient Considerations Curve 7 of the PAM3103 load-transient 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. Shutdown Input Operation 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. Internal P-Channel Pass Transistor The PAM3103 features a 0.75Ω device as a pass transistor. The PMOS pass transistor enables the PAM3103 to consume only 65µA of ground current during low dropout, light-load, or heavy-load operation. This feature increases the battery operation life time. Input-Output (Dropout) Voltage 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. PAM3103 Document number: DSxxxxx Rev. 1 - 5 6 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Application Information (cont.) Thermal Considerations Thermal protection limits power dissipation in the PAM3103. When the junct ion temperature 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. For continuous operation, the junction temperature should be maintained below +125°C. The power dissipation is defined as below: 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 / JA Where TJ(MAX) is the maximum allowable junction temperature +125°C, TA is the ambient temperature and θJA is the thermal resistance from the junction to the ambient. For example, as θJA is 250°C/W for the SOT-23 package based on the standard JEDEC 51-3 for a single-layer thermal test board, the maximum power dissipation at TA = +25°C can be calculated by following formula: PD(MAX) 125C 25C / 250 0.4 W It is also useful to calculate the junction temperature of the PAM3103 under a set of specific conditions. Suppose the input voltage VIN = 3.3V, the output current IO =300mA and the case temperature TA = +40°C measured by a thermal couple during operation, the power dissipation is defined as: PD 3.3 V 2.8 V * 300mA 3.3 V * 70A 150mW And the junction temperature TJ can be calculated as follows: TJ = TA + PD* θJA TJ = 40°C + 0.15W*250°C/W = 40°C + 37.5°C =77.5°C<TJ(MAX) = +125°C For this application, TJ is lower than the absolute maximum operating junction temperature +125°C, so it is safe to use the PAM3103 in this configuration. PAM3103 Document number: DSxxxxx Rev. 1 - 5 7 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Ordering Information Part Number PAM3103AABADJ PAM3103AUBADJ Output Voltage ADJ ADJ Part Marking ACAYW ACAYW Package Type TSOT25 SOT353(SC70-5) Standard Package 3000Units/Tape&Reel 3000Units/Tape&Reel Marking Information Top View TSOT25 PAM3103 Document number: DSxxxxx Rev. 1 - 5 8 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Package Outline Dimensions (All dimensions in mm.) TSOT25 PAM3103 Document number: DSxxxxx Rev. 1 - 5 9 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 Package Outline Dimensions (cont.) (All dimensions in mm.) PAM3103 Document number: DSxxxxx Rev. 1 - 5 10 of 11 www.diodes.com July 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3103 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. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. 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