Advanced Analog Technology, Inc. AAT1110 Details are subject to change without notice ONE-CHANNEL STEP-DOWN PWM CONTROLLER Features General Description z Under-Voltage Lockout (UVLO) Protection z Totem Pole Output z Output Short Circuit Protection The AAT1110 is a one-channel step-down PWM controller incorporating a soft-start function and a short circuit protection (SCP) function. 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 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 µA . Pin Configuration With an optimized number of external components, the AAT1110 offers a simple and cost effective solution. VDD – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 1 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Pin Description Pin No 1 2 3 4 5 6 7 8 Name CE SCP VDD OUT GND OSC OE IE I/O I O O O I Description Chip Enable Input Pin（Internal Pull "H"） Soft-Start and SCP Capacitor Connection Pin Power Supply Totem-Type Output Pin Ground Capacitor and Resistor Connection Pin for Setting the Oscillation Frequency Error Amplifier Output Pin Error Amplifier Inverting Input Pin Absolute Maximum Ratings Characteristics Supply Voltage Symbol VDD Value 7 Unit V Output Current IO − 120 /+120 mA Operating Free-Air Temperature Range TC − 20 to +85 o Tstorage − 45 to +125 o Pd 500 Storage Temperature Range Power Dissipation C C mW Recommended Operating Conditions Characteristics Supply Voltage, VDD Symbol VDD VI C OSC Min 2.6 0.5 Max 6.5 1.6 Unit V V 100 10,000 pF OSC Resistor R OSC 1.0 10.0 kΩ Oscillator Frequency f OSC 10 1,000 kHz Output Current IO - +30/ − 30 mA Operating Free-Air Temperature TC − 20 +85 Error Amplifier Input Voltage OSC Capacitor o C – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 2 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1) Oscillator Parameter f OSC Oscillation Frequency Frequency Variation With Temperature Frequency Input Stability Lower Threshold Voltage Hysteresis ( VUPH – VUPL ) f ∆V VDD = 2.6V to 6.5V VUPH Test Condition TC = 25 oC VUPL VHYS Short Circuit Protection Control Parameter Max Unit 400 500 600 Min kHz 5 % 1 % Typ Max Unit 2.12 2.47 2.85 V 1.96 2.28 2.63 V o 0.19 TC = 25 C V TC =25 oC Test Condition Min Typ Max Unit Vr1 1.160 1.262 1.360 V Vtscd 1.160 1.262 1.360 V I SCP Charging Current Typ o TC = 25 C Note1: Typical values of all parameters are specified at Input Threshold Voltage Short-Circuit Detect Threshold Voltage Min f ∆T Under-Voltage Protection Parameter Upper Threshold Voltage Test Condition C OSC = 270pF, R OSC = 4.2 kΩ VSCP =0V − 2.15 − 1.50 − 1.00 µA Soft-Start Parameter I CS Charging Current Voltage at Soft-Start Completion Test Condition VSCP =0V Vts Shutdown Control Parameter VSE Shutdown Release Voltage VSR − 2.15 Typ Max Unit − 1.50 − 1.00 µA 1.160 1.262 1.360 Test Condition Shutdown Enable Voltage Min Min Typ Max Unit 0.5 2.0 V V V – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 3 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Electrical Characteristics, VDD = 3.3V (Unless Otherwise Specified) (See Note 1) EA (Error Amplifier) Parameter Input Threshold Voltage VT Input Stability VT Variation with Temperature Input Bias Current Output Voltage Swing VT Test Condition VOE = 0.7V Min Typ Max Unit VT∆V VDD = 2.6 to 6.5V - 2 8 mV VT∆T TC = − 20 oC to 90 oC - 1 - % IB - 0.1 1.0 µA VOS+ 1.4 1.7 - VOS− - 0.05 0.20 1.249 1.262 1.275 V V Output Sink Current I OS+ VOE =0.7V 3 20 - mA Output Source Current I OS− VOE =0.7V − 45 − 75 - µA Open-Loop Voltage Gain A VO 70 85 - dB Min Typ 1.9 2.3 - V Output Section Parameter High-Level Output Voltage VOH Test Condition IO= − 30 mA Low-Level Output Voltage VOL IO=+30mA - 0.8 1.2 V Rise Time t RISE CL=1,000pF - 100 - ns Fall Time t FALL CL=1,000pF - 100 - ns Min Typ - 1.3 - mA - 1.6 - mA Operating Current Parameter Supply Current I DD−OFF Test Condition Output ”OFF” State I DD−ON RT =4.2 kΩ Max Unit Max Unit – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 4 of 17 V 1.0 Advanced Analog Technology, Inc. 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 C SCP connected to SCP pin starts charging at a constant current. In the soft-start mode, the voltage at SCP pin ( VSCP ) is input to the PWM comparator, so that the ON duty of the OUT pin is controlled by the VSCP . 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 t s (sec) ~ 0.84 × C SCP (µF) 2. Short Circuit Protection If the switching regulator output suddenly drops due to loading effect, the error amplifier output will be fixed at VOM + and capacitor C SCP 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 t scp (sec) ~ 0.84 × C SCP (µF) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 5 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Block Diagram V DD CE C h ip E n a b le GND IREF V REF 1 .2 6 V SCP C om p. LA TCH CE S o ft-S tart SCP SCP OSC OSC UVC UVC CE UVLO PW M Com p. V REF 1 .2 6 v V DD OE V REF CE CE V DD V REF 1 .2 6 V E rr-A m p IE OUT UVC CE – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 6 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Application Circuit Buck (Step-Down) VDD Cscp VDD VDD VDD – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 7 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Buck (Step-Down) Timing Chart 1.262V OE Reference Input for Short Circuit ldle Period Setting Voltage Soft-Start Setting Voltage OSC Output SCP Soft-Start Output Short Circuit Output Short Circuit tscp ts 2.47V Lockout Free VDD – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 8 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Package Dimension 8-Pin SOP θ SYMBOLS DIMENSIONS IN MILLIMETERS DEMINSIONS IN INCHES MIN TYP MAX MIN TYP MAX A 1.47 1.60 1.73 0.058 0.063 0.068 A1 0.10 --- 0.22 0.004 --- 0.008 A2 --- 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 E1 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 --- --- 0 θ 0 --- 0 0 --- 0 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 9 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Tape and Reel 8-PinSOP – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 17 V 1.0 Advanced Analog Technology, Inc. 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. 4. A 0 AND B 0 ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. 5. K 0 IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF 6. THE CARRIER. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 11 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Package Dimension TSSOP-8 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 12 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Package Dimension TSSOP-8 SYMBOL A A1 A2 b C D E E1 e L y θ DIMENSION IN MILLIMETERS MIN TYP MAX 1.05 1.10 1.20 0.05 0.10 0.15 ----1.00 1.05 0.25 ----0.30 ----0.127 ----2.90 3.05 3.10 6.20 6.40 6.60 4.30 4.40 4.50 ----0.65 ----0.50 0.60 0.70 --------0.076 o o 0 8o 4 DIMENSION IN INCHES MIN TYP MAX 0.041 0.043 0.047 0.002 0.004 0.006 ----0.039 0.041 0.010 ----0.012 ----0.005 ----0.114 0.120 0.122 0.244 0.252 0.260 0.169 0.173 0.177 ----0.026 ----0.020 0.024 0.028 --------0.003 o o 0 8o 4 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. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 13 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Tape and Reel TSSOP-8 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 14 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Tape and Reel TSSOP-8 (Cont.) X.XXX X ± 0.0025 ± 0.006 X.XXX ± 0.025 X.XX ± 0.10 X.X ± 0.25 X 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. 4. A 0 AND B 0 ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. 5. K 0 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. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 15 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Part Marking SOP8 Top Marking AAT1110 XXXXXX SOP8 Back Marking YYWW Part Marking TSSOP8 Top Marking AAT1110 XXXXXX TSSOP8 Back Marking YYWW – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 16 of 17 V 1.0 Advanced Analog Technology, Inc. AAT1110 Ordering Information – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 17 of 17 V 1.0