LC1118CS8TR1833

LC1118 Dual 1A Low Dropout Regulator DESCRIPTION FEATURES LC1118 is a dual channel low-dropout regulator that delivers a maximum current of 1A for each individual output. Typical dropout voltage at 1A load current is 1.3V. Each individual output voltage can be set independently as fixed voltage (e.g. 1.2V, 1.8V, 2.5V, 3.3V, 5V) or adjustable output which can provide an output voltage from 1.25 to 12V with two external resistors. The output accuracy of each channel is set within 2% by trimming.         LC1118 offers thermal shut down and current limit functions to ensure reliability of device and power system. Dual channel output with each individual output can be either fixed output version or adjustable version. Maximum output current for each channel is 1A Range of operation input voltage: Max 12V Standby current of each output: 2mA (typ.) Line regulation: 0.1%/V (typ.) Load regulation: 10mV (typ.) Environment temperature: -20C~85C Compatible with tantalum capacitor, electrolytic capacitor and MLCC. APPLICATIONS  Package input/output pin configuration can be customized on demand (i.e. both output can share one input to save one input capacitor and corresponding PCB real estate).     LC1118 is available in lead (Pb)-free ESOP-8(with exposed pad for heat dissipation) package. Power management for computer mother board, graphic card LCD monitor and LCD TV DVD decoder board ADSL modem Post regulators for switching supplies TYPICAL APPLICATION R1 R2 1 Vin1 2 Cin1 10uF Vin2 GND/ADJ Vout1 Vin1 Vout1 8 7 LC1118 3 4 GND/ADJ Vout2 Vin2 Vout2 Vout1 Cout1 10uF 6 Vout2 5 Cin2 10uF Cout2 10uF Fig.1. Typical application of LC1118 www.leadchip.com.cn 1 Your final power solution LC1118 ORDERING INFORMATION ABSOLUTE MAXIMUM RATING Parameter LC1118 □ 1□ 2□ 3□ 4□ 5 Code Max input voltage Operating junction temperature(TJ) Ambient temperature(TA) Package thermal ESOP8 resistance(JC) Storage temperature(TS) Lead temperature & time Description Temperature&Rohs: C:-40~85C , Pb Free Rohs Std. Package type: S8: ESOP-8 Packing type: TR: Tape&Reel (Standard) CH1 Output voltage: e.g. 33=3.3V AD=ADJ CH2 Output voltage: e.g. 33=3.3V AD=ADJ 1 □ 2 □ 3 □ 4 □ 5 □ 1118 Product Code LLLL Lot No. 12V 150C -20C -85C 10C / W -40C -150C 260C,10S Note: 1) Exceed these limits to damage to the device. 2) Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS MARKING DESCRIPTON Marking Value Parameter Input voltage range Ambient temperature LC1118CS8TR□□□□ Value Max. 12V -20C ～ 85C XX： Vo1 Output Voltage XXYY YY： Vo2 Output Voltage PIN CONFIGURATION PIN Symbol 1 2 3 4 5 6 7 8 GND Vin1 GND Vin2 Vout2 Vout2 Vout1 Vout1 Description Ground Channel 1 Input Ground Channel 2 Input Channel 2 Output Channel 2 Output Channel 1 Output Channel 1 Output www.leadchip.com.cn 2 Your final power solution LC1118 ELECTRICAL CHARACTERISTICS *For each individual channel output Test Conditions: Cin=0.1uF, Cout=10uF, TA=25C, unless otherwise specified. Symbol VREF VOUT ΔVOUT ΔVOUT Parameter Reference voltage Output voltage Line regulation Load regulation www.leadchip.com.cn Conditions LC1118-ADJ 10mA≤Iout≤1A , Vin=3.25V LC1118-1.2V 0≤Iout≤1A , Vin=3.2V LC1118-1.8V 0≤Iout≤1A , Vin=3.8V LC1118-2.5V 0≤Iout≤1A , Vin=4.5V LC1118-3.3V 0≤Iout≤1A , Vin=5.3V LC1118-5.0V 0≤Iout≤1A , Vin=7.0V LC1118-1.2V Iout=10mA, 2.7V≤Vin≤10V LC1118-ADJ Iout=10mA, 2.75V≤Vin≤12V LC1118-1.8V Iout=10mA, 3.3V≤Vin≤12V LC1118-2.5V Iout=10mA, 4.0V≤Vin≤12V LC1118-3.3V Iout=10mA, 4.8V≤Vin≤12V LC1118-5.0V Iout=10mA, 6.5V≤Vin≤12V LC1118-ADJ Vin =2.75V, 10mA≤Iout≤1A LC1118-ADJ Vin =2.75V, 10mA≤Iout≤1A LC1118-1.8V Vin=3.3V, 10mA≤Iout≤1A LC1118-2.5V Vin=4.0V, 10mA≤Iout≤1A LC1118-3.3V Vin=4.8V, 10mA≤Iout≤1A LC1118-5.0V Vin=6.5V, 10mA≤Iout≤1A 3 Min Typ Max Unit 1.225 1.25 1.275 V 1.176 1.2 1.224 V 1.764 1.8 1.836 V 2.45 2.5 2.55 V 3.234 3.3 3.366 V 4.9 5 5.1 V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 10 30 mV 10 30 mV 10 30 mV 10 30 mV 10 30 mV 10 30 mV Your final power solution LC1118 ELECTRICAL CHARACTERISTICS continued Symbol Parameter Conditions Min Typ Max Unit Iout=100mA 1.23 1.3 V Iout=1A 1.3 1.5 V VDROP Dropout voltage ILIMIT Current limit Vin-Vout=2V, TJ=25°C IMIN Minimum load current LC1118-ADJ 2 10 mA LC1118-1.2V, Vin =10V 2 5 mA LC1118-1.8V, Vin =12V 2 5 mA LC1118-2.5V,Vin =12V 2 5 mA LC1118-3.3V, Vin =12V 2 5 mA LC1118-5.0V, Vin =12V 2 5 mA 55 120 uA 0.2 10 uA IQ IADJ Quiescent current Adjust pin current ICHANGE IADJ change ΔV/ΔT Temperature coefficient JA Junction-ambient thermal resistance LC1118-ADJ Vin =5V, 10mA≤Iout≤1A LC1118-ADJ Vin =5V, 10mA≤Iout≤1A ESOP-8 1 A ±100 ppm 63 °C/W Note: 1) All test are conducted under ambient temperature 25°C and within a short period of time 20ms 2) Load current smaller than minimum load current of LC1118-ADJ will lead to unstable or oscillation output. www.leadchip.com.cn 4 Your final power solution LC1118 BLOCK DIAGRAM Fig.2 Block diagram for each individual channel DETAILED DESCRIPTION LC1118 is a series of dual channel low-dropout regulator that delivers a maximum current of 1A for each individual output. Typical dropout voltage at 1A load current is 1.3V. Each individual output voltage can be set independently as fixed voltage (i.e. 1.2V, 1.8V, 2.5V, 3.3V, 5V) or adjustable output which can provide an output voltage ranges from 1.25 to 12V with two external resistors. The output accuracy of each channel is set within 2% by trimming. The device has build-in modules including start-up circuit, bias circuit, bandgap, thermal shutdown, current limit, power transistors and driver circuit. Thermal shut down and current limit functions ensure reliability of device and power system. The bandgap module provides stable reference voltage whose temperature coefficient is compensated by careful design considerations. The temperature coefficient is under 100 ppm/°C. The accuracy of output voltage is guaranteed by trimming technique. Package input/output pin configuration can be customized on demand (i.e. both output can share one input to save one input capacitor and corresponding PCB real estate). LC1118 is available in lead (Pb)-free ESOP-8 package. www.leadchip.com.cn 5 Your final power solution LC1118 TYPICAL APPLICATION R1 R2 1 Vin1 2 Cin1 10uF Vin2 GND/ADJ Vout1 Vin1 Vout1 8 7 LC1118 3 4 GND/ADJ Vout2 Vin2 Vout2 Vout1 Cout1 10uF 6 Vout2 5 Cin2 10uF Cout2 10uF Fig.3. Typical application schematic of LC1118 LC1118 has both fixed voltage version (1.2V, 1.8V, 2.5V, 3.3V, 5V ) and adjustable voltage version. The input and output capacitors of each channel can be either tantalum, electrolytic or ceramic capacitor. Figure 3 shows both fixed voltage and adjustable voltage application schematic. Channel 1 (designated as pin 1\2\7\8) is the schematic of adjustable version application. Channel 2 (designated as pin 3\4\5\6) is a typical application of fixed voltage. The adjustable version provides a 1.25V reference voltage with regard to its ADJ pin (shown as PIN 7\8 as its output and PIN1 as its adjustable pin in Fig.3). The output voltage of adjustable version follows the equation: Vout=1.25(1+R2/R1)+IADJR2. We can ignore IADJ because IADJ (about 50uA) is much less than the current of R1 (in the order of several milliamps). 1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. 2) Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. The impedance of CADJ should be less than R1 to prevent ripple from being amplified. As R1 is normally in the range of 100Ω~500Ω, the value of CADJ should satisfy this equation: 1/(2frippleCADJ)