AAT1150 Advanced Analogic Technologies, AAT1150 Datasheet
AAT1150
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AAT1150 Summary of contents
Page 1
... IC provides high effi- ciency using synchronous rectification. Fully inter- nally compensated, the AAT1150 simplifies system design and lowers external parts count. The AAT1150 is available in an MSOP-8 package and is rated over the -40°C to +85°C temperature range. Typical Application INPUT 10µ ...
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... SGND Signal ground Enable input pin. When connected high, the AAT1150 is in normal operation. When connected low powered down. This pin should not be left floating. 4 VCC Power supply. It supplies power for the internal circuitry Input supply voltage for converter power stage ...
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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. 4. Derate 6.7mW/°C above 25°C. 1150.2005.03.1.2 1MHz 1A Step-Down DC/DC Converter 1 - HBM 3 = 25°C) A AAT1150 Value 6 -0 +0 +0 -40 to 150 ...
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... 0V 5. 25°C 1 25° 25° 5V 3.3V, IN OUT I = 600mA OUT V = 2 2.7 to 5. 25°C 700 A AAT1150 = 25°C. A Typ Max Units 5.5 V 4.0 % 3.0 % 0.2 %/V 2.5 V 250 mV 160 300 µA 1.0 µA A 110 150 mΩ 100 150 mΩ 0 1.0 µA 1000 ...
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... Step-Down DC/DC Converter 170 150 130 110 90 70 -20 80 100 120 Enable Threshold vs. Input Voltage 1.2 1.1 1 0.9 0.8 0.7 4.5 5 5.5 2.5 Oscillator Frequency Variation vs. Temperature -10 4.5 5 5.5 -20 AAT1150 Low Side R vs. Temperature DS(ON) 3.6V 2.7V 5.5V 4. 100 Temperature (° 3.5 4 4.5 5 Input Voltage ( 3.6V ...
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... Loop Gain and Phase vs. Output Capacitor -16 -24 -32 -40 10 4.5 5 5.5 AAT1150 Line Regulation (V = 1.5V) OUT I = 1.0A OUT I = 0.4A OUT 5 3 3.5 4 4.5 Input Voltage (V) Load Regulation (V = 3.3V 5.0V) OUT IN 150 300 450 600 750 900 Output Current (mA 3.6V ...
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... CC 180 170 160 150 140 130 V = 2.7V CC 120 110 100 - 1.2A) OUT V OUT 50mV/div Inductor Current 500mA/div = 0A) OUT V OUT 5mV/div BW = 20MHz LX 2V/div AAT1150 vs. Temperature Q ( Temperature (°C) Transient Response (V = 3.6V 1.5V ...
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... Output Ripple (V = 5.0V OUT V OUT 5mV/div BW = 20MHz LX 2V/div 500nsec/div Inrush Limit (V = 3.6V OUT Enable 2V/div V OUT 1V/div I L 0.5A/div 200µsec/div 8 1MHz 1A Step-Down DC/DC Converter = 3.3V 0A) OUT 5mV/div BW = 20MHz = 1.5V 1A) L AAT1150 Output Ripple (V = 5.0V 3.3V OUT OUT V OUT LX 2V/div 500nsec/div 1150.2005.03.1.2 = 1A) ...
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... REF FB Applications Information Control Loop The AAT1150 is a peak current mode buck con- verter. The inner wide bandwidth loop controls the peak current of the output inductor. The output inductor current is sensed through the P-channel MOSFET (high side) and is also used for short-cir- cuit and overload protection ...
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... OUT 4.1µH 2x 22µ Figure 1: Lithium-Ion to 1.5V Converter. V 3.3V 1A OUT 100 C2, C4 4.1µ 22µ AAT1150 1.5V Efficiency vs. I OUT 2.7V 4.2V 3.6V 100 I (mA) OUT 3.3 Volt Efficiency vs. I OUT V = 5.0V IN 100 I (mA) OUT 1150.2005.03.1.2 1000 1000 ...
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... Input Capacitor The primary function of the input capacitor is to pro- vide a low impedance loop for the edges of pulsed current drawn by the AAT1150. A low ESR/ESL ceramic capacitor is ideal for this function. To mini- mize stray inductance, the capacitor should be placed as closely as possible to the IC. This keeps ...
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... R3 is 2.55kΩ Layout Considerations Figures 4 and 5 display the suggested PCB layout for the AAT1150. The most critical aspect of the lay- out is the placement of the input capacitor C1. For proper operation, C1 must be placed as closely as possible to the AAT1150. Thermal Calculations ...
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... Figure 4: AAT1150 Layout Top Layer 3. 10µF Figure 6: 3.3V to 1.25V Converter (Adjustable Output). 1150.2005.03.1.2 1MHz 1A Step-Down DC/DC Converter Figure 5: AAT1150 Layout Bottom Layer. R3 AAT1150-1.0 2.55k 100 R4 VCC 10k 100k LX 2.7µH SGND PGND C3 0.1µ Murata 10µF 6.3V X5R GRM42-6X 5R106K6.3 C2, C4 MuRata 22µ ...
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... P = ESR ESR COUT RMS 14 1MHz 1A Step-Down DC/DC Converter × RMS IN O ⎛ ⎞ 1.5 V 1.5V ⋅ 3.9µH ⎝ ⎠ 4.2V ⎛ ⎞ 1.5V ⋅ 280mA ⎝ ⎠ 4.2V 1.5V ⋅ (4.2V - 1.5V) 1 ⋅ = 82mA 4.1µH ⋅ 830kHz ⋅ 4.2V ⋅ 33µW AAT1150 RMS 1150.2005.03.1.2 ...
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... AAT1150 Dissipation ⋅ ⋅ ⋅ DSON(H) O DSON( ⋅ ⋅ (0.14Ω 1.5V + 0.145Ω (3.6V - 1.5V)) = 3.6V + Θ ⋅ 85°C + 150°C/W J(MAX) AMB JA LOSS Table 1: Surface Mount Inductors. Manufacturer Part Number TaiyoYuden NPO5DB4R7M Toko A914BYW-3R5M-D52LC Sumida CDRH5D28-4R2 Sumida CDRH5D18-4R1 ...
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... MSOP-8 HYXYY MSOP-8 KAXYY MSOP-8 KCXYY MSOP-8 HZXYY MSOP-8 1.95 BSC PIN 1 3.00 ± 0.10 10° ± 5° 0.075 ± 0.075 0.30 ± 0.08 0.65 BSC AAT1150 Part Number (Tape and Reel) AAT1150IKS-1.0-T1 AAT1150IKS-1.5-T1 AAT1150IKS-1.8-T1 AAT1150IKS-2.5-T1 AAT1150IKS-3.3-T1 4° ± 4° 0.60 ± 0.20 0.254 BSC 0.155 ± 0.075 1150.2005.03.1.2 ...