A Product Line of Diodes Incorporated PAM3112 300mA CMOS LINEAR REGULATOR Description Pin Assignments The PAM3112 regulator features low quiescent current (65µA Typ) and excellent line/load regulation, making it ideal for battery powered applications. The output voltage can be 1.2V or 1.3V. Space-saving Top View SOT23 Top View TSOT25 packages SOT23, TSOT25, SOT-89 and SC70 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. The device is stable with an output capacitance of 2.2µF or greater. Features • Accuracy within ±2% • Quiescent Current: 65µA Typ. • Excellent Line/Load Regulation • Guaranteed 300mA Output Current • Fast Response • Current Limiting • Short Circuit Protection • Low Temperature Coefficient • Thermal Shutdown • Space Saving Package: SOT23, TSOT25, SOT-89 and SC70 • Pb-Free Package Applications • Cordless Phone • Cellular Phone • Bluetooth Earphone • Digital Camera • Portable Electronics • WLAN • MP3 Player Typical Applications Circuit PAM3112 Document number: DSxxxxx Rev. 2 - 3 1 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Pin Configuration and Description Package Type SOT23 TSOT25 SOT89-3 SC70-3L SC70-4L SC70-5L Pin Name VIN GND EN BYP VOUT 1 VOUT GND VIN GND VOUT VIN EN VIN 2 GND VOUT GND VIN GND VOUT GND GND Pin Number 3 VIN VIN EN VOUT VIN GND VOUT EN 4 — — BYP — — VIN BYP 5 — — VOUT — — — VOUT Function Input Ground Chip Enable (active high) Bypass Pin, need a 10nF capacitor connect to GND Output Functional Block Diagram PAM3112 Document number: DSxxxxx Rev. 2 - 3 2 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 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 Rating 6.0 Unit V PD/(VIN – VO) — GND -0.3 to VIN +0.3V 300, (5sec) 150 -65 to +150 Class B °C °C °C — Output Current Output Pin Voltage Lead Soldering Temperature Maximum Junction Temperature Storage Temperature ESD Rating V Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Rating -40 to +125 -40 to +85 Junction Temperature Ambient Temperature Unit °C Thermal Information Parameter Symbol Thermal Resistance (Junction to Case) θJC Thermal Resistance (Junction to Ambient) θJA Internal Power Dissipation (@TA = +25°C) PD PAM3112 Document number: DSxxxxx Rev. 2 - 3 3 of 17 www.diodes.com Package SOT23/ TSOT25 SOT-89 SC70 SOT23/ TSOT25 SOT-89 SC70 SOT23/ TSOT25 SOT-89 SC70 Max Unit 130 45 TBD °C/W 250 160 300 400 550 300 mW January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Electrical Characteristics (@TA = +25°C, VIN = 3V, CIN = 1µF, CO = 2.2µF, unless otherwise specified.) Parameter Symbol Input Voltage VIN Output Voltage Accuracy VO Output Current IO Ground Current IGND Quiescent Current IQ Test Conditions Min IO = 1mA Typ Max Units 2.5 5.5 V -2 +2 % Note 1 mA IO = 1mA to 300mA 300 70 90 µA IO = 0mA 65 90 µA Line Regulation LNR VIN = 2.5V to 5.0V IO = 10mA 0.10 0.15 %/V Load Regulation LDR IO = 1mA to 300mA 30 60 mV VO = 0V 130 mA 40 ppm/°C 150 °C 30 °C Short Circuit Current ISC Temperature Coefficient TC Over Temperature Shutdown OTS Over Temperature Hysteresis OTH Power Supply Ripple Rejection PSRR IO = 1mA IO = 1mA IO = 100mA CBYP = 10nF Output Noise VN f = 10Hz to 100kHz, CBYP = 10nF EN Input High Threshold VIN VIN = 2.5V to 5V EN Input Low Threshold VIL VIN = 2.5V to 5V Shutdown Current ISD VEN = 0V Notes: -0.15 f = 100Hz 70 f = 1kHz 65 dB 50 µVRMS 1.5 V 0.01 0.3 V 1 µA 1. Output current is limited by PD, maximum IO = 400mW/ (VIN(MAX) – VO). PAM3112 Document number: DSxxxxx Rev. 2 - 3 4 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Typical Performance Characteristics (@TA = +25°C, CIN = 1µF, CO = 2.2µF, VO = 1.2V, unless otherwise specified.) PAM3112 Document number: DSxxxxx Rev. 2 - 3 5 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Typical Performance Characteristics (cont.) (@TA = +25°C, CIN = 1µF, CO = 2.2µF, VO = 1.2V, unless otherwise specified.) PAM3112 Document number: DSxxxxx Rev. 2 - 3 6 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Application Information Capacitor Selection and Regulator Stability Similar to any low dropout regulator, the external capacitors used with the PAM3112 must be carefully selected for regulator stability and performance. A capacitor CIN of more than 1µF can be used at the PAM3112 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 PAM3112 should not exceed 0.5 inch. Ceramic capacitors are suitable for the PAM3112. Capacitors with larger values and lower ESR (equivalent series resistance) provide better PSRR and line-transient response. The PAM3112 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. A 10nF bypass capacitor connected to BYP pin is suggested for suppressing output noise. The capacitor, in series connection with an internal 200kΩ resistor, forms a low-pass filter for noise reduction. Increasing the capacitance will slightly decrease the output noise, but increase the startup time. Load Transient Consideration Curve 7 of the PAM3112 load-transient response on page 6 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 PAM3112. 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 PAM3112 is 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 PAM3112 features a 0.75Ω P-Channel MOSFET device as a pass transistor. The P-MOS pass transistor enables the PAM3112 to consume only 65µA of ground current during low dropout, light-load, or heavy-load operation. These features increase the battery operation life time. Input-Output (Dropout) Voltage A regulator's minimum input-output voltage difference (or dropout voltage) determines the lowest usable supply voltage. The PAM3112 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 PAM3112 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 PAM3112 also has a built-in short circuit current limit. Thermal Considerations Thermal protection limits power dissipation in the PAM3112. When the junction 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: 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 PAM3112 Document number: DSxxxxx Rev. 2 - 3 7 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Application Information (cont.) Thermal Considerations 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. For example, as θJA is 250°C/W for the SOT23 and TSOT25 packages 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) = (125°C − 25°C) / 250 = 0.4 W SOT-23 It is also useful to calculate the junction temperature of the PAM3112 under a set of specific condition. Suppose the input voltage VIN =3.3V, the output current IO =150mA and the case temperature TA = +40°C measured by a thermal couple during operation, the power dissipation is defined as: PD = (3.3 V − 1.2V ) * 150mA + 3.3 V * 70μA ≅ 315mW And the junction temperature, TJ can be calculated as follows: TJ = TA + PD*θJA TJ = 40°C +0.35W*250°C/W = 40°C +78.75°C = 118.75°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 PAM3112 in this configuration. PAM3112 Document number: DSxxxxx Rev. 2 - 3 8 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Ordering Information Pin Configuration F Type: A Type: 1. EN 1. VOUT 2. GND 2. GND 3. VOUT 3. VIN 4. VIN B Type: G Type: 1. GND 1. VIN 2. VOUT 2. VOUT 3. VIN 3. GND D Type: H Type: 1. VIN 1. GND 2.GND 2. VIN 3.EN 3. VOUT 4.BYP 5.VOUT Part Number PAM3112AAA120 PAM3112BAA120 PAM3112DAB120 Output Voltage 1.2V 1.2V 1.2V PAM3112ACA120 1.2V PAM3112HCA120 1.2V PAM3112GUA120 PAM3112FUK120 PAM3112DUB120 PAM3112AAA130 PAM3112BAA130 PAM3112DAB130 1.2V 1.2V 1.2V 1.3V 1.3V 1.3V PAM3112ACA130 1.3V PAM3112HCA130 1.3V PAM3112GUA130 PAM3112FUK130 PAM3112DUB130 1.3V 1.3V 1.3V PAM3112 Document number: DSxxxxx Rev. 2 - 3 Package Type A: SOT23/TSOT25 C: SOT-89 U: SC70 Marking AOBYW AOBYW AOBYW P3112B XXXYW P3112B XXXYW AOBYW AOBYW AOBYW AOWYW AOWYW AOWYW P3112W XXXYW P3112W XXXYW AOWYW AOWYW AOWYW 9 of 17 www.diodes.com Number of Pins A: 3 K: 4 B: 5 F: 6 Output Voltage 120: 1.2V 130: 1.3V Package Type SOT23 SOT23 TSOT25 Standard Package 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel SOT89-3 1000 Units/ Tape&Reel SOT89-3 1000 Units/ Tape&Reel SC70-3 SC70-4 SC70-5 SOT23 SOT23 TSOT25 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel SOT89-3 1000 Units/ Tape&Reel SOT89-3 1000 Units/ Tape&Reel SC70-3 SC70-4 SC70-5 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel 3000 Units/ Tape&Reel January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Marking Information Top View SOT23 PAM3112 Document number: DSxxxxx Rev. 2 - 3 Top View TSOT25 10 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Package Outline Dimensions (All dimensions in mm.) SOT23 PAM3112 Document number: DSxxxxx Rev. 2 - 3 11 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Package Outline Dimensions (cont.) (All dimensions in mm.) TSOT25 PAM3112 Document number: DSxxxxx Rev. 2 - 3 12 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Package Outline Dimensions (cont.) (All dimensions in mm.) PAM3112 Document number: DSxxxxx Rev. 2 - 3 13 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Package Outline Dimensions (cont.) (All dimensions in mm.) PAM3112 Document number: DSxxxxx Rev. 2 - 3 14 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Package Outline Dimensions (cont.) (All dimensions in mm.) PAM3112 Document number: DSxxxxx Rev. 2 - 3 15 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 Package Outline Dimensions (cont.) (All dimensions in mm.) PAM3112 Document number: DSxxxxx Rev. 2 - 3 16 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM3112 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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