AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT DESCRIPTION DESCRIPTION FEATURES FEATURES Output Current of 1A Maximum Three-Terminal Adjustable or Fixed Outputs Maximum Input Voltage: 15V Fast Transient Response Current Limit, Safe Operating and Thermal Shutdown Protection Line Regulation: 0.2% Load Regulation: 0.4% Environment Temperature: -50oC~+140oC Available in SOT-223 and TO-252 Package. High Efficiency Linear Regulators Post Regulator for Switching DC/DC Converter Power Management for M/B and Graphic Card 2.85V Model for SCSI-2 Active Termination Battery Charger LCD Monitor and LCD TV DVD Decode Board ADSL Modem The A1117 is designed to provide 1A for requiring high efficiency applications. The A1117 series of positive fixed voltage (VOUT = 1.8V, 2.5V, 2.8V, 3.3V, 5V) and adjustable version, which can provide an output voltage from 1.25V to 13.8V with only two external resistors. The A1117 offers current limiting and thermal protection to assure the stability of chip and power system. And the on chip trimming technique to guarantee output voltage accuracy within ±2%. The A1117 is available in SOT-223 and TO-252 packages. TYPICAL APPLICATION TYPICAL APPLICATION APPLICATION APPLICATION ORDERING INFORMATION ORDERING INFORMATION Package Type ackage Type Part Number art Number A1117NR-XX A1117NVR-XX A1117NR-ADJ A1117NVR-ADJ A1117DR-XX A1117DVR-XX A1117DR-ADJ Adjustable Output Version VOUT=VREF(1+R2/R1)+IADJ*R2 The output of A1117-ADJ provides any output voltage between 1.25V~13.8V can be available by choosing two external resistors. SOT-223 N TO-252 D Fixed Output Version A1117DVR-ADJ XX: Output Voltage, 33=3.3V, 50=5V, ADJ: Adjustable NOTE R: Tape & Reel V: GREEN PACKAGE AiT provides all Pb free products Suffix “ V” means Green Package - 1 - REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED - AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT PIN DESCIPTION PIN DESCIPTION Top View Pin in # 1 2 3 Top View SOT-SOT-223 223 A1117NR/NVRA1117NR/NVR-/NVR-XX GND VOUT VIN Top View Top View TO-TO-252 252 A1117DR/DVRA1117DR/DVR-/DVR-XX GND VOUT VIN A1117NR/NVRA1117NR/NVR-/NVR-ADJ ADJ ADJ VOUT VIN A1117DR/DVRA1117DR/DVR-/DVR-ADJ ADJ ADJ VOUT VIN ABSOLUTE MAXIMUM RATINGS ABSOLUTE MAXIMUM RATINGS Maximum Input Voltage Operating Junction Temperature (TJ) Environment Temperature (TA) Storage Temperature Range (Ts) Lead Temperature (soldiering, 10 seconds) 15V 150 oC 140 oC -65 oC to +150 oC 260 oC, 10s Stresses above may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED - - 2 - AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT ELECTRICAL CHARACTERISTICS ELECTRICAL CHARACTERISTICS Test Condition: VIN = VOUT +2V, IOUT =10mA, and TJ = 25oC, unless otherwise specified. Symbol Symbol VREF Parameter Parameter Reference Voltage Conditions Conditions IOUT = 10mA, VIN – VOUT = 2V 10mA≦IOUT≦1A, 1.5V≦VIN–VOUT≦12V 1.8V 2.5V VOUT Output Voltage 3.3V 5.0V ADJ IOUT = 10mA, VIN = 3.8V, TJ = 25oC 0≦IOUT≦1A, 3.2V≦VIN≦12V IOUT = 10mA, VIN = 4.5V, TJ = 25oC 0≦IOUT≦1A, 3.9V≦VIN≦12V IOUT = 10mA, VIN = 5V, TJ = 25oC 0≦IOUT≦1A, 4.75V≦VIN≦12V IOUT = 10mA, VIN = 7V, TJ = 25oC 0≦IOUT≦1A, 6.5V≦VIN≦12V IOUT=10mA, 1.5V≦VIN–VOUT≦13.775V VIN – VOUT = 3V, 10mA≦IOUT≦1A Min Min Typ. Typ. Max Max Unit Unit V 1.238 1.250 1.262 1.225 1.250 1.275 1.782 1.7 2.475 2.450 3.267 3.234 4.95 4.90 1.25 SOT-223 TO-252 1.80 1.80 2.50 2.50 3.30 3.30 5.00 5.00 0.035 9 0.2 3 1.11 1.18 1.26 1.4 5 4 55 20 10 1.818 1.836 2.525 2.550 3.333 3.366 5.05 5.10 0.2 12 0.4 10 1.20 1.25 1.30 1.6 10 8 120 0.5 % mV % mV V V V A mA mA uA % oC/V ΔVOUT Line Regulation Fixed IOUT=10mA, VOUT +1.5V≦VIN≦15V ΔVOUT Load Regulation ADJ Fixed VIN = VOUT +1.5V,10mA≦IOUT≦1A ΔVOUT, ΔVREF = 1%, IOUT = 100mA VIN–VOUT Dropout Voltage ICL Iq IADJ Current Limit Quiescent Current ADJ Pin Current ΔVOUT, ΔVREF = 1%, IOUT = 500mA ΔVOUT, ΔVREF = 1%, IOUT = 1A VIN – VOUT = 2V, TJ = 25oC Adjustable Version Fixed VIN – VOUT = 1.25V Minimum Load Current (Note 1) Temperature Stability θJC Thermal Resistor W Note 1: For the adjustable device, the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED - - 3 - AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT TYPICAL PERFORMANCE CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS 1.Load Regulation VOUT=3.3V 2.Load Regulation vs. Temperature IOUT form 10mA to 1A 4.Dropout Voltage TA=25oC, 90oC 3.Line Regulation VOUT=3.3V, IOUT=10mA 5.Output Voltage vs. Temperature 6.Adjustable Pin Current vs. Temperature REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED - - 4 - AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT 7.Load Transient Response Load Current Change from 2mA to 500mA BLOCK DIAGRAM BLOCK DIAGRAM REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED - - 5 - AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT DETAILED INFORMATION DETAILED INFORMATION The A1117 is a series of low dropout voltage, three terminal regulators. The A1117’s application circuit is very simple: the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. The A1117 is composed of some modules including start-up circuit, bias circuit, band-gap, thermal shutdown, current limit, power transistors and A1117’s driver circuit etc. Thermal Shutdown Thermal Shutdown The thermal shutdown and current limit modules can assure chip and its application system working safety when the junction temperature is larger than 140oC or output current is larger than 1.4A. Band-Band-gap Module gap Module The band-gap module provides stable reference voltage, whose temperature coefficient is compensated by careful design considerations. The temperature coefficient is under 100ppm/oC. And the accuracy of output voltage is guaranteed by trimming technique. Fixed Output Version Fixed Output Version A1117 has adjustable & fixed output version, Fig 1. is typical Fixed output version application. Fig 1. Fixed Output Voltage Version 1. Recommend using 10uF tan capacitor as bypass capacitor(CIN) for all application circuit. 2. Recommend using 22uF tan capacitor to assure circuit stability (COUT) REV1.2 - JAN 2006 RELEASED – SEP 2008 REVISED - - 6 - AiT Semiconductor Inc. AiT Semiconductor Inc. www.ait-ic.com A1117A1117 117 1A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR THERMAL PROTECTION AND 1.4A CURRENT LIMIT Adjustable Output Version Adjustable Output Version A1117 has adjustable & fixed output version, Fig 2. is typical adjustable output version application. The A1117 adjustable version provides 1.25V reference voltage. Any output voltage between 1.25V~13.8V can be available by choosing two external resistors (R1 & R2, connection method is showed in Fig 2.) Fig2. Adjustable Output Version The output voltage of adjustable version satisfies this followed equation: VOUT=VREF*(1+R2/R1) + IADJ*R2. We can ignore IADJ because IADJ (about 50uA) is much less than the current of R1 (about 4mA). The value of R1 should be I the range of 200Ω~350Ω to assure chip working normally without any load. To assure the electrical performance, the output current should be larger than 5mA. If R1 is too large, the minimum output current should be larger than 4mA. The best working condition is to assure that the output current exceeds 10mA. Using a bypass capacitor (CADJ) between the adjust terminal 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 the resistor’s (R1) which is between output and adjust pins to prevent ripple from being amplified at any ripple frequency. As R1 is normally in the range of 200Ω~350Ω,the value of CADJ should satisfy this equation: 2*FRIPPLE*CADJ