AAT1110 AAT | Alldatasheet
Document overview
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Technical content
Features
z Under-Voltage Lockout (UVLO) Protection z Totem Pole Output z Output Short Circuit Protection z Incorporates Soft-Start Function z Wide Operating Frequency： 10 kHz to 1MHz z Shutdown Control z Low Dissipation Current : Typical 1.6mA in Operation z SOP-8 & TSSOP-8 Package Available Pin Configuration DD V General Description The AAT1110 is a one-channel step-down PWM controller incorporating a soft-start function and a short circuit protection (SCP) function. Each device consists of an on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage protection, soft-start, and short circuit protection circuits. Switching frequencies up to 1MHz are set by an external resistor and capacitor. Soft-start time can be implemented by the SCP capacitor. Additionally, a chip enabled feature is provided to power down and reduce the supply current to 10 A µ With an optimized number of external components, the AAT1110 offers a simple and cost effective solution.
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 2 of 17 V 1.0 AAT1110 Pin Description Pin No Name I/O
Description
I Chip Enable Input Pin（Internal Pull "H"） SCP - Soft-Start and SCP Capacitor Connection Pin DD V - Power Supply OUT O Totem-Type Output Pin GND - Ground OSC O Capacitor and Resistor Connection Pin for Setting the Oscillation Frequency OE O Error Amplifier Output Pin IE I Error Amplifier Inverting Input Pin Absolute Maximum Ratings Characteristics Symbol Value Unit Supply Voltage DD V V Output Current O I 120 /+120 mA Operating Free-Air Temperature Range C T to +85 oC Storage Temperature Range storage T to +125 oC Power Dissipation d P 500 mW Recommended Operating Conditions Characteristics Symbol Min Max Unit Supply Voltage, DD V DD V 2.6 6.5 V Error Amplifier Input Voltage I V 0.5 1.6 V OSC Capacitor OSC C 100 10,000 pF OSC Resistor OSC R 1.0 10.0 Ω k Oscillator Frequency OSC f 1,000 kHz Output Current O I +30/ mA Operating Free-Air Temperature C T +85 oC
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 3 of 17 V 1.0 AAT1110 Electrical Characteristics, DD V = 3.3V (Unless Otherwise Specified) (See Note 1) Oscillator Parameter Test Condition Min Typ Max Unit Oscillation Frequency OSC f OSC C = 270pF, OSC R = 4.2 Ω k 400 500 600 kHz Frequency Variation With Temperature T Frequency Input Stability V DD V = 2.6V to 6.5V Under-Voltage Protection Parameter Test Condition Min Typ Max Unit Upper Threshold Voltage UPH V C T = 25 oC 2.12 2.47 2.85 V Lower Threshold Voltage UPL V C T = 25 oC 1.96 2.28 2.63 V Hysteresis ( UPH V UPL V HYS V C T = 25 oC 0.19 V Note1: Typical values of all parameters are specified at C T =25 oC Short Circuit Protection Control Parameter Test Condition Min Typ Max Unit Input Threshold Voltage r V 1.160 1.262 1.360 V Short-Circuit Detect Threshold Voltage tscd V 1.160 1.262 1.360 V Charging Current SCP I SCP V =0V A µ Soft-Start Parameter Test Condition Min Typ Max Unit Charging Current CS I SCP V =0V A µ Voltage at Soft-Start Completion ts V 1.160 1.262 1.360 V Shutdown Control Parameter Test Condition Min Typ Max Unit Shutdown Enable Voltage SE V 0.5 V Shutdown Release Voltage SR V 2.0 V
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 4 of 17 V 1.0 AAT1110 Electrical Characteristics, DD V = 3.3V (Unless Otherwise Specified) (See Note 1) EA (Error Amplifier) Parameter Test Condition Min Typ Max Unit Input Threshold Voltage T V OE V = 0.7V 1.249 1.262 1.275 V T V Input Stability V T V ∆ DD V = 2.6 to 6.5V mV T V Variation with Temperature T T V ∆ C T = oC to 90 oC Input Bias Current BI 0.1 1.0 A µ OS V 1.4 1.7 Output Voltage Swing OS V 0.05 0.20 V Output Sink Current OS I OE V =0.7V mA Output Source Current OS I OE V =0.7V A µ Open-Loop Voltage Gain VO A dB Output Section Parameter Test Condition Min Typ Max Unit High-Level Output Voltage OH V IO= mA 1.9 2.3 V Low-Level Output Voltage OL V IO=+30mA 0.8 1.2 V Rise Time RISE t CL=1,000pF 100 ns Fall Time FALL t CL=1,000pF 100 ns Operating Current Parameter Test Condition Min Typ Max Unit OFF DD I Output ”OFF” State 1.3 mA Supply Current ON DD I RT =4.2 Ω k 1.6 mA
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 5 of 17 V 1.0 AAT1110 How to Set the Time Constant for Soft-Start and Short Circuit Protection 1. Soft-Start At power on, the AAT1110 operates in soft-start mode. The capacitor SCP C connected to SCP pin starts charging at a constant current. In the soft-start mode, the voltage at SCP pin ( SCP V ) is input to the PWM comparator, so that the ON duty of the OUT pin is controlled by the SCP V . At completion of the soft-start operation, the voltage at the SCP pin stays low; the input from soft-start circuit to the PWM comparator stays high, and enters the short circuit protection waiting state. Soft-Start Time F C (sec) t SCP s µ 2. Short Circuit Protection If the switching regulator output suddenly drops due to loading effect, the error amplifier output will be fixed at OM V and capacitor SCP C will start charging. When the voltage at the SCP pin reaches approximately 1.26V, the output pin will set low and SCP pin will remain low. Once the protection circuit starts operating, the circuit can be recovered by setting the power supply. Short Circuit Detection Time F C (sec) t SCP scp µ
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 6 of 17 V 1.0 AAT1110 Block Diagram Soft-Start SC P V RE F U V LO CE SC P V DD O U T U V C L A TC H U V C V R EF 1.26v IE O SC PW M Com p. E rr-A m p U V C O SC V D D SCP C om p. G N D O E V R EF 1.26V C hip Enable V DD V R EF 1.26V IREF C E C E C E C E C E
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 7 of 17 V 1.0 AAT1110 Application Circuit Buck (Step-Down) DD V DD V scp C DD V DD V
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 8 of 17 V 1.0 AAT1110 Buck (Step-Down) Timing Chart 2.47V Lockout Free Output SCP 1.262V OSC OE ldle Period Setting Voltage Reference Input for Short Circuit Soft-Start Setting Voltage tscp ts Output Short Circuit Soft-Start Output Short Circuit DD V
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 9 of 17 V 1.0 AAT1110 Package Dimension 8-Pin SOP θ DIMENSIONS IN MILLIMETERS DEMINSIONS IN INCHES SYMBOLS MIN TYP MAX MIN TYP MAX A 1.47 1.60 1.73 0.058 0.063 0.068 0.10 --- 0.22 0.004 --- 0.008 --- 1.45 --- --- 0.057 --- b 0.33 0.41 0.51 0.013 0.016 0.020 C 0.19 0.20 0.25 0.0075 0.008 0.0098 D 4.80 4.85 4.95 0.189 0.191 0.195 E 5.80 6.00 6.20 0.228 0.236 0.244 3.80 3.90 4.00 0.150 0.154 0.157 e --- 1.27 --- --- 0.050 --- L 0.38 0.71 1.27 0.015 0.028 0.050 y --- --- 0.076 --- --- θ --- ---
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 17 V 1.0 AAT1110 Tape and Reel 8-PinSOP
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 11 of 17 V 1.0 AAT1110 Tape and Reel 8-Pin SOP (Cont.) NOTE: 1. 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE ± 0.2 MILLIMETERS. 2. CAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS 3. MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. A AND B ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. K IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF THE CARRIER. 6. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE.
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 12 of 17 V 1.0 AAT1110 Package Dimension TSSOP-8
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 13 of 17 V 1.0 AAT1110 Package Dimension TSSOP-8 DIMENSION IN MILLIMETERS DIMENSION IN INCHES SYMBOL MIN TYP MAX MIN TYP MAX A 1.05 1.10 1.20 0.041 0.043 0.047 0.05 0.10 0.15 0.002 0.004 0.006 ----- 1.00 1.05 ----- 0.039 0.041 b 0.25 ----- 0.30 0.010 ----- 0.012 C ----- 0.127 ----- ----- 0.005 ----- D 2.90 3.05 3.10 0.114 0.120 0.122 E 6.20 6.40 6.60 0.244 0.252 0.260 4.30 4.40 4.50 0.169 0.173 0.177 e ----- 0.65 ----- ----- 0.026 ----- L 0.50 0.60 0.70 0.020 0.024 0.028 y ----- ----- 0.076 ----- ----- 0.003 θ o o o o NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS. 2. LEAD FRAME MATERIAL: OLIN C7025/EFTEC 64T. 3. DIMENSION “D” DOES NOT INCLUDE MOLD FLASH, TIE BAR BURRS AND GATE BURRS. MOLD FLASH, TIE BAR BU 0.006” [0.15 MILLIMETERS] PER END. DIMENSION “E1” DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLA MILLIMETERS] PER SIDE. 4. DIMENSION “b” DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.00 “b” DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS O PROTRUSION AND AN ADJACENT LEAD TO BE 0.0028” [0.07 MILLIMETERS]. 5. TOLERANCE: ± 0.010” [0.25 MILLIMETERES] UNLESS OTHERWISE SPECIFIED. 6. OTHERWISE DIMENSION FOLLOW ACCEPTABLE SPEC. 7. REFERENCE DOCUMENT: JEDEC SPEC MO-153.
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 14 of 17 V 1.0 AAT1110 Tape and Reel TSSOP-8
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 15 of 17 V 1.0 AAT1110 Tape and Reel TSSOP-8 (Cont.) X.XXX X ± 0.0025 X.XXX ± 0.006 X.XX ± 0.025 X.X ± 0.10 X ± 0.25 UNIT: MILLIMETERS NOTE: 1. 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE ± 0.2 MILLIMETERS. 2. CHAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS. 3. MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. A AND B ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. K IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF THE CARRIER. 6. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE.
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 16 of 17 V 1.0 AAT1110 Part Marking SOP8 Top Marking AAT1110 XXXXXX SOP8 Back Marking YYWW Part Marking TSSOP8 Top Marking AAT1110 XXXXXX TSSOP8 Back Marking YYWW
Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 17 of 17 V 1.0 AAT1110