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| TECHNICAL DATA 1.0A Low Dropout Positive Voltage Regulator The IL1117 is a series of low dropout voltage regulators which can provide up to 1A of output current. The IL1117 is available in eight fixed voltage, 1.2, 1.25, 1.5, 1.8, 2.5, 2.85, 3.3 and 5.0V. Additionally it is also available in adjustable version. On chip precision trimming adjusts the reference/ output voltage to within 2%. Current limit is also trimmed to ensure specified output current and controlled short-circuit current. The IL1117 series is available in SOT-223, TO252, TO-220 packages. A minimum of 10uF tantalum capacitor is required at the output to improve the transient response and stability. IL1117-xx SOT-223 TO-252 Pin#2 connected with heat sink IL1117-xxD0T IL1117-xxET TO-220 1. ADJ/GND 2. Output 3. Input Features * * * * * * * * * Dropout Voltage - 1.2V(Typ) Reference/Output Voltage Trimmed to 1% Maximum Input Voltage - 15V Adjustable Output Voltage or Fixed 1.2V, 1.25V, 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5V Line Regulation typically at 0.2% max Load Regulation typically at 0.4% max Current Limiting and Thermal Protection Standard 3-Pin Power Packages Operating Junction Temperature Range -40 to +125C (for IL1117-1.2V - 0 to +150C) IL1117-xxKB Applications Post Regulator for switching DC/DC Converter High Efficiency Linear Regulator Battery Chargers PC Add on Card Motherboard clock supplies LCD Monitor Set-top Box Absolute Maximum Ratings Symbol VIN IOUT TJ JA JA JA PD PD PD Description Input Voltage DC Output Current Operating Junction Temperature Range Thermal Resistance (SOT-223) Thermal Resistance (TO-252) Thermal Resistance (TO-220) Maximum Power Dissipation (SOT-223) Maximum Power Dissipation (TO-252) Maximum Power Dissipation (SOT-220) Max 15 PD/(VIN-VO) -40 to 125 150 80 60 Internally Limited Units V mA C C/W C/W C/W mW mW mW Rev. 02 IL1117-xx Electrical Characteristics Vin = 5V, Co = 10uF, Ta = 25C, Tj = -40C to +125C ( for IL1117-1.2 Tj = 0 to +150C) unless otherwise specified PARAMETER OUTPUT VOLTAGE IL1117-1.2 IL1117-1.25 (Adjustable) IL1117-1.5 IL1117-1.8 IL1117-2.5 IL1117-2.85 IL1117-3.3 IL1117-5.0 LINE REGULATION IL1117-1.2 IL1117-1.25 (Adjustable) IL1117-1.5 IL1117-1.8 IL1117-2.5 IL1117-2.85 IL1117-3.3 IL1117-5.0 LOAD REGULATION IL1117-1.2 IL1117-1.25 (Adjustable) IL1117-1.5 IL1117-1.8 IL1117-2.5 IL1117-2.85 IL1117-3.3 IL1117-5.0 DROPOUT VOLTAGE (2) All Models Io =1A 1000 5 5.2 50 0.5 0.5 0.003 60 72 10 120 5 1.20 1.20 1.30 1.55 mA mA mA uA uA % %Vo dB V CONDITIONS Io = 10mA to 1.0A, Vin = 2.7 to 12.0V Io = 10mA to 1.0A, Vin = 2.8 to 12.0V Io = 10mA to 1.0A, Vin = 3.0 to 12.0V Io = 10mA to 1.0A, Vin = 3.3 to 12.0V Io = 10mA to 1.0A, Vin = 4.0 to 12.0V Io = 10mA to 1.0A, Vin = 4.4 to 12.0V Io = 10mA to 1.0A, Vin = 4.8 to 12.0V Io = 10mA to 1.0A, Vin = 6.5 to 15.0V MIN 1.176 1.225 1.470 1.764 2.450 2.790 3.240 4.900 TYP 1.200 1.250 1.500 1.800 2.500 2.850 3.300 5.000 MAX 1.224 1.280 1.530 1.836 2.550 2.910 3.360 5.100 UNIT V Io =10mA, Vin = 2.7 to 12.0V Io =10mA, Vin = 2.8 to 12.0V Io =10mA, Vin = 3.0 to 12.0V Io =10mA, Vin = 3.3 to 12.0V Io =10mA, Vin = 4.0 to 12.0V Io =10mA, Vin = 4.4 to 12.0V Io =10mA, Vin = 4.8 to 12.0V Io =10mA, Vin = 6.5 to 15.0V 2.0 0.1 2.0 2.0 2.0 2.0 3.0 4.0 7.0 0.2 7.0 7.0 7.0 7.0 7.0 10.0 mV % mV mV mV mV mV mV Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin Io = 10mA to 1.0A, Vin = 3.2V = 3.3V = 3.5V = 3.8V = 4.5V = 4.85V = 5.3V = 7.0V 3.0 0.2 3.0 3.0 3.0 3.0 4.0 5.0 10.0 0.4 10.0 10.0 10.0 10.0 12.0 15.0 mV % mV mV mV mV mV mV Io =1A (Tj = -40C to +125C) CURRENT LIMIT Vin - Vo = 5V MINIMUM LOAD CURRENT Adjustable Models Vin = 13.75V QUIESCENT CURRENT Adjust Pin Current vs Load Current, IL1117 TEMPERATURE DRIFT RMS Output Noise Ripple Rejection Ratio Vin - Vo = 1. 5V Io = 10mA, Vin - Vo = 1.4 to 10V Io = 10mA to 1A, Vin - Vo = 1.4 to 10V Tj = -40C to +125C Bandwidth of 10Hz to 10kHz at 25C 120Hz input Ripple(Cadj for ADJ) = 25uF Vin -Vo = 5V, Io = 1.0A Tj = -40C to +125C NOTES: (1) IL1117-x adjustable versions require a minimum load current for 3% regulation. (2) Dropout voltage is the input voltage minus output voltage that produces a 1% decrease in output voltage. Rev. 02 IL1117-xx Block Diagram Application Information IL1117 IL1117 (Adj) FIGURE 1. Fixed-Voltage Model --Basic Connections. FIGURE 2. Adjustable-Voltage Model --Basic Connections. Vo=Vref(1+R2/R1)+Iadj*R2 Rev. 02 IL1117-xx Typical Perfomance Characteristics Rev. 02 IL1117-xx Typical Perfomance Characteristics (continue) Figure 3. Rev. 02 IL1117-xx Application Information Output voltage adjustment Like most regulators, the IL1117 regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version as shown in Fig.4, the VREF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minumum output load). The output voltage is given by the following equation: On fixed versions of IL1117, the voltage divider is provided internally. Figure 4. Basic Adjustable Regulator Input Bypass Capacitor An input capacitor is recommended. A 10F tantalum on the input is a suitable input bypassing for almost all applications. Adjust Terminal Bypass Capacitor The adjust terminal can be bypassed to ground with a bypass capacitor (CADJ) to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance of the CADJ should be less than R1 to prevent the ripple from being amplified: The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100- 200. For example, with R1 = 124 and f RIPPLE = 120Hz, the CADJ should be > 11F. Output Capacitor IL1117 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10F tantalum or 50F aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does not exceed 0.5 . The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100F or more is typical for high current regulator design. Load Regulation When the adjustable regulator is used (Fig.5), the best load regulation is accomplished when the top of the resistor divider (R1) is connected directly to the output pin of the IL1117. When so connected, RP is not multiplied by the divider ratio. For Fixed output version, the top of R1 is internally connected to the output and ground pins can be connected to low side of the load. Rev. 02 IL1117-xx Figure 5. Best Load Regulation Using Adjustable Output Regulator Thermal Protection IL1117 has thermal protection which limits junction temperature to 150C. However, device functionality is only guaranteed to a maximum junction temperature of +125C. The power dissipation and junction temperature for IL1117 in DPAK package are given by Note: TJUNCTION must not exceed 125C Current Limit Protection IL1117 is protected against overload conditions. Current protection is triggered at typically 1.6A. Thermal Consideration The IL1117 series contain thermal limiting circuitry designed to protect itself from over-temperature conditions. Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It includes junction-tocase, case-to-heat-sink interface, and heat sink thermal resistance itself. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended. Rev. 02 IL1117-xx Rev. 02 IL1117-xx Rev. 02 IL1117-xx Rev. 02 |
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