AAT1155 AAT, AAT1155 Datasheet
AAT1155
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AAT1155 Summary of contents
Page 1
... Able to deliver 2.5A with an internal power MOS- FET, the current-mode controlled IC provides high efficiency. Fully internally compensated, the AAT1155 simplifies system design and lowers external parts count. The AAT1155 is available in a Pb-free MSOP-8 package and is rated over the -40°C to +85°C tem- perature range. Typical Application INPUT 10µ ...
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... Pin Configuration 2 1MHz 2.5A Step-Down DC/DC Converter Function Feedback input pin. Signal ground. Converter enable pin. Small signal filtered bias supply. Input supply for converter power stage. Inductor connection pin. MSOP GND VCC AAT1155 1155.2005.11.1.6 ...
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... Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. 3. Mounted on a demo board (FR4, in still air). 1155.2005.11.1.6 1MHz 2.5A Step-Down DC/DC Converter 1 - HBM 3 AAT1155 Value Units ...
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... OUT I = 0.5A OUT V Rising IN V Falling IN No Load 0V 5. 25° 25° 1.0A OUT 2.5A LOAD V = 2. 25°C A AAT1155 = 25°C. A Min Typ Max Units 2.7 5.5 V -2.5 2.5 % 0.6 V 1.4 V 2.5 V 1.2 250 mV 630 1000 µA 1.0 µA 4 mΩ ±2.3 % 0.75 %/V 1 MHz 140 ° ...
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... Oscillator Frequency Variation vs. Temperature 4.5 5 5.5 -20 Output Voltage Variation vs. Temperature 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -20 4.5 5 5.5 AAT1155 Oscillator Frequency Variation vs. Input Voltage (V = 3.3V) OUT 4 4.5 5 Input Voltage ( 5V Temperature (° 2A 3.3V) OUT Temperature (° ° C) 5.5 100 ...
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... AAT1155 AAT1155 Evaluation Board (V = 3.3V) OUT 3.75 4 4.25 4.5 4.75 5 5.25 Input Voltage (V) Non-Switching Operating Current vs. Temperature (FB = 0V) 3.6V 4.2V 5.0V 5. 100 Temperature (°C) Inrush and Output Overshoot Characteristics ...
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... IN 7 3.40 6 3.30 5 3.20 4 3.10 3 3.00 2 2.90 1 2.80 0 2. AAT1155 L = 1.5µHy Phase 200µF gain 300µF gain 100000 Frequency (Hz) Gain 100000 Frequency (Hz) Tantalum Transient Response = 0 to 3.0A 3.3V 5.0V) OUT OUT IN 120µF 6.3V Tantalum Vishay P/N 594D127X96R3C2T 0 100 200 300 400 500 Time (µ µ s) ...
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... Time (µ µ 1MHz 2.5A Step-Down DC/DC Converter = 5.0V 3.40 6 3.30 3. 3.10 3 3.00 2 2.90 2. 2.70 -1 2.60 400 500 0 AAT1155 Transient Response = 0 to 3.0A 3.3V 5.0V) OUT OUT 100µF 6.3V Ceramic TDK P/N C3325X5R0J107M 4 Vishay GRM43SR60J107ME20L 100 200 300 400 500 Time (µ µ s) 1155.2005.11.1.6 ...
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... Functional Block Diagram FB Applications Information Main Control Loop The AAT1155 is a peak current mode step-down converter. The inner wide bandwidth loop controls the inductor peak current. The inductor current is sensed as it flows through the internal P-channel MOSFET. A fixed slope compensation signal is then added to the sensed current to maintain sta- bility for duty cycles greater than 50% ...
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... Vin 2.7V-5.5V C4 100µF C1 10µF rtn Figure 1: AAT1155 Evaluation Board with Adjustable Output. Current Limit and Over-Temperature Protection Over-temperature and current limit circuitry pro- tects the AAT1155 and the external Schottky diode during overload, short-circuit, and excessive ambi- ent temperature conditions. The junction over-tem- perature threshold is 140° ...
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... For overload, short-circuit, and excessive ambient temperature conditions, the AAT1155 enters over- temperature shutdown mode protecting the AAT1155 as well as the output Schottky. In this mode, the output current is limited internally until the junction temperature reaches the temperature limit (see over-temperature characteristics graphs). ...
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... This will help to minimize any error in DC regulation due to differences in the potential of the internal reference ground and the load return and C3 are required in order to provide a cleaner power source for the AAT1155 con- trol circuitry. Figure 4: Evaluation Board Bottom Side. AAT1155 (Pins 5 and 8) and GND P 1155 ...
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... Thermal Losses associated with the AAT1155 output switch- ing MOSFET are due to switching losses and con- duction losses. The conduction losses are associ- ated with the R characteristics of the output DS(ON) switching device. At the full load condition, assum- ing continuous conduction mode (CCM), an accu- ...
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... For most applications, where the source has sufficient bulk capacitance and is fed directly to the AAT1155 through large PCB traces or planes not required. When operating the AAT1155 evaluation ...
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... Inductance I DCR (Ω Ω ) (µH) (Amps) 1.5 4.0 0.014 1.5 3.2 0.025 1.5 3.0 0.022 1.5 3.7 0.022 1.5 3.8 0.016 Part Number B340LA RB050L-40 5820SM AAT1155 Temp Co. Case X5R 1812 X5R 1812 X5R 1812 X5R 1206 C C Height (mm) Type 4.0 Shielded 2.8 Non-Shielded 3.2 Shielded 4.7 Non-Shielded 4.7 Shielded V F 0.45V @ 3A 0. 0.46V @ 3A ...
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... Sample stock is generally held on part numbers listed in BOLD. 16 1MHz 2.5A Step-Down DC/DC Converter Marking 1 MSOP-8 KXXYY MSOP-8 KYXYY MSOP-8 ILXYY MSOP-8 IKXYY MSOP-8 1.95 BSC 0.254 BSC 3.00 ± 0.10 10° ± 5° 0.30 ± 0.08 0.65 BSC AAT1155 Part Number (Tape and Reel) 2 AAT1155IKS-1.0-T1 AAT1155IKS-1.8-T1 AAT1155IKS-2.5-T1 AAT1155IKS-3.3-T1 4° ± 4° 0.60 ± 0.20 0.155 ± 0.075 1155.2005.11.1.6 ...
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... AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 1155.2005.11.1.6 1MHz 2.5A Step-Down DC/DC Converter AAT1155 17 ...