DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter General Description Features The AAT1150 is a step-down, SwitchReg™, switching converter ideal for applications where high efficiency, small size, and low ripple are critical. Able to deliver 1A with internal power MOSFETs, the current-mode controlled IC provides high efficiency using synchronous rectification. Fully internally compensated, the AAT1150 simplifies system design and lowers external parts count. • • • • • • • • • • • • • • • • • The AAT1150 is available in a Pb-free, MSOP-8 package and is rated over the -40°C to +85°C temperature range. VIN Range: 2.7V to 5.5V Up to 95% Efficiency 110m RDS(ON) MOSFET Switch <1.0μA of Shutdown Current 1MHz Switching Frequency Adjustable VOUT: 1.0V to 4.2V High Initial Accuracy: ±1% 1.0A Peak Current Integrated Power Switches Synchronous Rectification Internally Compensated Current Mode Control Constant PWM Mode for Low Output Ripple Internal Soft Start Current Limit Protection Over-Temperature Protection MSOP-8 package -40°C to +85°C Temperature Range Applications • • • • • Cable/DSL Modems Computer Peripherals High Efficiency Conversion From 5V or 3.3V Supply Network Cards Set-Top Boxes Typical Application VOUT : 1.0V - 4.2V VIN : 2.7V - 5.5V VP AAT1150 LX 100Ω VCC LX ENABLE FB SGND 10μF 4.1μH PGND 0.1μF Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 3x22μF 6.3V 1 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Pin Descriptions Pin # Symbol 1 2 FB SGND 3 EN 4 5 VCC VP 6, 7 LX 8 PGND Function Feedback input pin. This pin is connected to an external resistive divider for an adjustable output. Signal ground. Enable input pin. When connected high, the AAT1150 is in normal operation. When connected low, it is powered down. This pin should not be left floating. Power supply. It supplies power for the internal circuitry. Input supply voltage for converter power stage. Inductor connection pins. These pins should be connected to the output inductor. Internally, Pins 6 and 7 are connected to the drains of the P-channel switch and N-channel synchronous rectifier. Power ground return for the output stage. Pin Configuration MSOP-8 (Top View) PGND 7 LX 3 6 LX 4 5 VP SGND 2 EN VCC 2 1 1 2 8 FB Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Absolute Maximum Ratings1 Symbol VCC, VP VLX VFB VEN TJ VESD Description VCC, VP to GND LX to GND FB to GND EN to GND Operating Junction Temperature Range ESD Rating2 - HBM Value Units 6 -0.3 to VP + 0.3 -0.3 to VCC + 0.3 -0.3 to 6 -40 to 150 3000 °C V Value Units 150 667 °C/W mW Rating Units -40 to +85 °C V Thermal Characteristics3 Symbol JA PD Description Maximum Thermal Resistance Maximum Power Dissipation (TA = 25°C)4 Recommended Operating Conditions Symbol T Description Ambient Temperature Range 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. 2. Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin. 3. Mounted on a demo board. 4. Derate 6.7mW/°C above 25°C. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 3 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Electrical Characteristics VIN = VCC = VP = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol VIN VOUT VOUT (VOUT*VIN) VOUT/VOUT VUVLO VUVLO(HYS) IQ ISHDN ILIM RDS(ON)H RDS(ON)L VEN(L) VEN(H) IEN FOSC TSD THYS 4 Description Conditions Min Input Voltage Range Output Voltage Tolerance VIN = VOUT + 0.3 to 5.5V, IOUT = 0 to 1A 2.7 -4.0 Load Regulation VIN = 4.2V, ILOAD = 0 to 1A 3.0 Line Regulation VIN = 2.7V to 5.5V VIN Rising VIN Falling 0.2 Under-Voltage Lockout Under-Voltage Lockout Hysteresis Quiescent Supply Current Shutdown Current Current Limit High Side Switch On Resistance Low Side Switch On Resistance Efficiency Enable Low Voltage Enable High Voltage Enable Pin Leakage Current Oscillator Frequency Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Typ Max Units 5.5 4.0 V % %/V 2.5 1.2 250 160 No Load, VFB = 0 VEN = 0V, VIN = 5.5V mV 300 1.0 1.2 TA = 25°C VIN = 2.7V to 5.5V VEN = 5.5V TA = 25°C 150 150 1.4 1000 140 15 1.0 1200 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 m % 0.6 700 μA A 110 100 93 VIN = 5V, VOUT = 3.3V, IOUT = 600mA V V μA kHz °C DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Typical Characteristics Efficiency vs. Output Current Efficiency vs. Output Current (VOUT = 1.5V) (VOUT = 3.3V) 100 100 90 2.7V 60 4.2V 40 VIN = 5.0V 80 Efficiency (%) Efficiency (%) 80 3.6V 20 70 60 50 40 30 20 10 0 0 10 100 10 1000 100 Output Current (mA) 1000 Output Current (mA) Low Side RDS(ON) vs. Temperature High Side RDS(ON) vs. Temperature 170 170 3.6V 150 150 RDS(ON) (mΩ) RDS(ON) (mΩ) 2.7V 130 110 70 -20 5.5V 4.2V 90 0 20 40 130 3.6V 2.7V 110 5.5V 90 60 80 100 4.2V 70 -20 120 0 20 40 Temperature (°C) RDS(ON) vs. Input Voltage 80 100 120 Enable Threshold vs. Input Voltage 1.2 Enable Threshold (V) 130 120 High Side RDS(ON) (mΩ) 60 Temperature (°C) 110 100 Low Side 90 80 1.1 VEN(H) 1 0.9 VEN(L) 0.8 0.7 2.5 3 3.5 4 4.5 Input Voltage (V) 5 5.5 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 5 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Typical Characteristics Oscillator Frequency Variation vs. Temperature (VIN = 3.6V) 3.5 10 2.5 6 Variation (%) Variation (%) Oscillator Frequency Variation vs. Supply Voltage 1.5 0.5 2 -2 -0.5 -6 -1.5 2.5 3 3.5 4 4.5 5 -10 -20 5.5 0 20 80 Line Regulation (IOUT = 900mA; VOUT = 1.5V) (VOUT = 1.5V) 0.25 0.6 0.15 VIN = 2.7V 0.2 -0.2 100 IOUT = 1.0A VIN = 3.6V 0.05 IOUT = 0.4A -0.05 -0.15 -0.6 -0.25 0 20 40 60 80 2.5 100 3 3.5 4 5 4.5 5 Input Voltage (V) Temperature (°C) Load Regulation Load Regulation (VOUT = 1.5V; VIN = 3.6V) (VOUT = 3.3V; VIN = 5.0V) 0 0 -1 -1 VOUT Error (%) Error (%) 60 Output Voltage vs. Temperature 1.0 -1.0 -20 40 Temperature (°C) Accuracy (%) Output Voltage Error (%) Supply Voltage (V) -2 -3 -4 -2 -3 -4 -5 -5 0 0 150 300 450 IOUT (mA) 6 600 750 150 300 450 600 750 900 Output Current (mA) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 900 1050 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Typical Characteristics Efficiency vs. Input Voltage AAT1150 Loop Gain and Phase (VOUT = 1.5V) (CO = 22μF; VO = 1.5V; VIN = 3.6V; IO = 1A) 160 16 IO = 1A 12 Gain (dB) 8 IO = 0.4A 80 70 40 0 0 -4 Gain 3 x 22mF -8 4 x 22mF -20 10 2.5 3 3.5 4 4.5 5 5.5 -80 -160 -200 1000 100 Frequency (kHz) Input Voltage (V) No Load Input Current vs. Temperature Non-Switching IQ vs. Temperature (VCC = VP) (FB = 0V; VP = VCC) 12 VCC = 5.0V Operating Current (μA) VCC = 5.5V Input Current (mA) -40 -120 5 x 22mF -16 50 80 4 -12 60 120 Phase 10 8 6 VCC = 4.2V 4 VCC = 3.6V VCC = 2.7V 2 200 190 180 VCC = 5.5V VCC = 5.0V 170 160 150 140 130 VCC = 4.2V VCC = 3.6V VCC = 2.7V 120 110 100 -20 0 -20 -5 10 25 40 Phase (degrees) 90 Efficiency (%) 200 20 100 55 70 -5 8 10 25 40 55 70 85 Temperature (°C) Temperature (°C) Switching Waveform Transient Response (VIN = 3.6V; VOUT = 1.5V; IOUT = 1.2A) (VIN = 3.6V; VOUT = 1.5V; ILOAD = 0.25 to 1.2A) VOUT 50mV/div V(LX) 2V/div Inductor Current 500mA/div IL 500mA/div Time (500ns/div) Time (20μs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 7 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Typical Characteristics Output Ripple Output Ripple (VIN = 3.6V; VOUT = 1.5V; IOUT = 0A) (VIN = 3.6V; VOUT = 1.5V; IOUT = 1A) VOUT 5mV/div BW = 20MHz VOUT 5mV/div BW = 20MHz LX 2V/div LX 2V/div Time (500ns/div) Time (500ns/div) Output Ripple Output Ripple (VIN = 5.0V; VOUT = 3.3V; IOUT = 0A) (VIN = 5.0V; VOUT = 3.3V; IOUT = 1A) VOUT 5mV/div BW = 20MHz VOUT 5mV/div BW = 20MHz LX 2V/div LX 2V/div Time (500ns/div) Time (500ns/div) Inrush Limit (VIN = 3.6V; VOUT = 1.5V; IL = 1A) Enable 2V/div VOUT 1V/div IL 0.5A/div Time (200μs/div) 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Functional Block Diagram VCC VP = 2.7V- 5.5V 1.0V REF OP. AMP CMP DH LOGIC LX FB DL Temp. Sensing OSC SGND Applications Information Control Loop The AAT1150 is a peak current mode buck converter. 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-circuit and overload protection. A fixed slope compensation signal is added to the sensed current to maintain stability. The loop appears as a voltage-programmed current source in parallel with the output capacitor. The voltage error amplifier output programs the current loop for the necessary inductor current to force a constant output voltage for all load and line conditions. The feedback resistive divider is external, dividing the output EN PGND voltage to the error amplifier reference voltage of 1.0V. The error amplifier does not have a large DC gain typical of most error amplifiers. This eliminates the need for external compensation components while still providing sufficient DC loop gain for load regulation. The crossover frequency and phase margin are set by the output capacitor value only. Soft Start/Enable Soft start increases the inductor current limit point in discrete steps when the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. The enable input, when pulled low, forces the AAT1150 into a low power, non-switching state. The total input current during shutdown is less than 1μA. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 9 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Power and Signal Source Separate small signal ground and power supply pins isolate the internal control circuitry from the noise associated with the output MOSFET switching. The low pass filter R1 and C7 in schematic Figures 1 and 2 filters the noise associated with the power switching. Current Limit and Over-Temperature Protection For overload conditions, the peak input current is limited. Figure 3 displays the current limit characteristics. As load impedance decreases and the output voltage falls closer to zero, more power is dissipated internally, raising the device temperature. Thermal protection completely disables switching when internal dissipation becomes excessive, protecting the device from damage. The junction over-temperature threshold is 140°C with 15°C of hysteresis. Efficiency vs. Output Current (VOUT = 1.5V) AAT1150 VOUT : 1.5V 1A L1 VP LX VCC LX 4.1μH R1 100Ω ENABLE SGND 2.7V 80 R3 R2 100k FB 5k PGND R4 10k C7 0.1μF C1 10μF 100 C2,C3,C4 3x22μF 6.3V Efficiency (%) VIN : 2.7V - 5.5V 60 4.2V 40 3.6V 20 C1 Murata 10μF 6.3V X 5R GRM 42-6X 5R106K 6.3 0 C2,C3,C4 Murata 22uF 6.3V GRM 21BR60J226ME 39L 0805 X 5R L 1 Sumida CDRH 5D18-4R1μH 10 100 1000 Output Current (mA) Figure 1: Lithium-Ion to 1.5V Converter. Efficiency vs. Output Current (VOUT = 3.3V) 100 AAT1150 VIN : 3.5V -5.5V 90 VOUT : 3.3V 1A L1 LX VCC LX ENABLE FB 4.1μH R2 100 k R3 SGND C1 10μF 23k PGND R4 10k C7 0.1μF C2,C3,C4 3x22μF 6.3V Efficiency (%) VP R1 100Ω VIN = 5.0V 80 70 60 50 40 30 20 10 0 C1 Murata 10μF 6.3V X 5R GRM 42-6X 5R106K 6.3 C2,C3,C4 Murata 22μF 6.3V GRM 21BR 60J226ME 39L 0805 X 5R L 1 Sumida CDRH 5D18-4R1μH 10 100 Output Current (mA) Figure 2: 5V Input to 3.3V Output Converter. 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 1000 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter The factor “k” is the fraction of full load selected for the ripple current at the maximum input voltage. The corresponding inductor RMS current is: Output Voltage (V) 3.5 VCC = VP = 5.0V VO = 3.3V Figure 2 Schematic 3 2.5 2 IRMS = 1.5 VCC = VP = 3.6V VO = 1.5V Figure 1 Schematic 1 0.5 0 0 0.5 1 1.5 2 2.5 Output Current (A) Figure 3: Current Limit Characteristics. Inductor The output inductor is selected to limit the ripple current to some predetermined value, typically 20% to 40% of the full load current at the maximum input voltage. Manufacturer’s specifications list both the inductor DC current rating, which is a thermal limitation, and the peak current rating, which is determined by the saturation characteristics. The inductor should not show any appreciable saturation under normal load conditions. During overload and short-circuit conditions, the average current in the inductor can meet or exceed the ILIMIT point of the AAT1150 without affecting converter performance. Some inductors may have sufficient peak and average current ratings yet result in excessive losses due to a high DCR. Always consider the losses associated with the DCR and its effect on the total converter efficiency when selecting an inductor. For a 1.0A load and the ripple set to 30% at the maximum input voltage, the maximum peak-to-peak ripple current is 300mA. The inductance value required is 3.9μH. ⎛ V ⎞ VOUT L= ⋅ 1 - OUT IO ⋅ k ⋅ FS ⎝ VIN ⎠ L= 1.5V ⎛ 1.5V ⎞ ⋅11.0A ⋅ 0.3 ⋅ 830kHz ⎝ 4.2V⎠ L = 3.9μH IO2 + ∆I2 ≈ IO = 1.0A 12 I is the peak-to-peak ripple current which is fixed by the inductor selection above. For a peak-to-peak current of 30% of the full load current, the peak current at full load will be 115% of the full load. The 4.1μH inductor selected from the Sumida CDRH5D18 series has a 57m DCR and a 1.95A DC current rating. At full load, the inductor DC loss is 57mW which amounts to a 3.8% loss in efficiency. Input Capacitor The primary function of the input capacitor is to provide 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 minimize stray inductance, the capacitor should be placed as closely as possible to the IC. This keeps the high frequency content of the input current localized, minimizing radiated and conducted EMI while facilitating optimum performance of the AAT1150. Ceramic X5R or X7R capacitors are ideal for this function. The size required will vary depending on the load, output voltage, and input voltage source impedance characteristics. A typical value is around 10μF. The input capacitor RMS current varies with the input voltage and the output voltage. The equation for the RMS current in the input capacitor is: IRMS = IO ⋅ VO ⎛ VO ⎞ ⋅ 1VIN ⎝ VIN ⎠ The input capacitor RMS ripple current reaches a maximum when VIN is two times the output voltage where it is approximately one half of the load current. Losses associated with the input ceramic capacitor are typically minimal and are not an issue. Proper placement of the input capacitor can be seen in the reference design layout shown in Figures 4 and 5. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 11 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Output Capacitor Layout Considerations Since there are no external compensation components, the output capacitor has a strong effect on loop stability. Larger output capacitance will reduce the crossover frequency with greater phase margin. For the 1.5V 1.0A design using the 4.1μH inductor, three 22μF 6.3V X5R capacitors provide a stable output. In addition to assisting stability, the output capacitor limits the output ripple and provides holdup during large load transitions. Figures 4 and 5 display the suggested PCB layout for the AAT1150. The most critical aspect of the layout is the placement of the input capacitor C1. For proper operation, C1 must be placed as closely as possible to the AAT1150. The output capacitor RMS ripple current is given by: IRMS = 1 2⋅ 3 ⋅ VOUT ⋅ (VIN - VOUT) L ⋅ FS ⋅ VIN For a ceramic capacitor, the dissipation due to the RMS current of the capacitor is not a concern. Tantalum capacitors, with sufficiently low ESR to meet output voltage ripple requirements, also have an RMS current rating much greater than that actually seen in this application. Adjustable Output For applications requiring an output other than 1V, the AAT1150 can be externally programmed. Resistors R3 and R4 of Figure 6 force the output to regulate higher than 1V. R4 should be 100 times less than the internal 1MΩ resistance of the FB pin. Once R4 is selected, R3 can be calculated. For a 1.25V output with R4 set to 10.0kΩ, R3 is 2.55kΩ. Thermal Calculations There are two types of losses associated with the AAT1150 output switching MOSFET: switching losses and conduction losses. Conduction losses are associated with the RDS(ON) characteristics of the output switching device. At full load, assuming continuous conduction mode (CCM), a simplified form of the total losses is: PLOSS = IO2 ⋅ (RDS(ON)H ⋅ VO + RDS(ON)L ⋅ (VIN - VO)) VIN + tsw ⋅ FS ⋅ IO ⋅ VIN + IQ ⋅ VIN Once the total losses have been determined, the junction temperature can be derived from the JA for the MSOP-8 package. R3 = (VO - 1) · R4 = 0.25 · 10.0kΩ = 2.55kΩ 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Figure 4: AAT1150 Evaluation Board Layout Top Layer. VIN + 3.3V Figure 5: AAT1150 Evaluation Board Layout Bottom Layer. AAT1150-1.0 VP FB R1 100 R2 EN 100k C7 0.1μF R4 10k 1% VCC EN C1 10μF R3 V + 1.25V 1A 2.55k 1% O LX SGND PGND LX L1 2.7μH C2, C3, C4 3x 22μF 6.3V VC1 Murata 10μF 6.3V X5R GRM42-6X 5R106K6.3 C2, C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805 L1 Sumida CDRH4D28-2R7μH Figure 6: 3.3V to 1.25V Converter (Adjustable Output). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 13 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Design Example Specifications IOUT = 1.0A IRIPPLE = 30% of Full Load at Max VIN VOUT = 1.5V VIN = 2.7V to 4.2V (3.6V nominal) Fs = 830kHz Maximum Input Capacitor Ripple IRMS = IO ⋅ VO ⎛ VO ⎞ IO ⋅ 1= = 0.5ARMS, VIN = 2 ⋅ VO VIN ⎝ VIN⎠ 2 P = ESRCOUT ⋅ IRMS2 = 5mΩ ⋅ 0.52 A = 1.25mW Inductor Selection L= ⎛ VOUT V ⎞ 1.5V 1.5V⎞ ⎛ ⋅ 1 - OUT = ⋅ 1= 3.9μH IO ⋅ k ⋅ FS ⎝ VIN ⎠ 1.0A ⋅ 0.3 ⋅ 830kHz ⎝ 4.2V⎠ Select Sumida inductor CDRH5D18, 4.1μH, 57m, 2.0mm height. ΔI = ⎛ 1.5V ⎞ VO 1.5V ⎛ V ⎞ ⋅ 1- O = ⋅ 1= 280mA L ⋅ FS ⎝ VIN ⎠ 4.1μH ⋅ 830kHz ⎝ 4.2V⎠ IPK = IOUT + ΔI = 1.0A + 0.14A = 1.14A 2 P = IO2 ⋅ DCR = 57mW Output Capacitor Dissipation IRMS = VOUT ⋅ (VIN - VOUT) 1.5V ⋅ (4.2V - 1.5V) 1 1 ⋅ ⋅ = = 82mARMS L ⋅ FS ⋅ VIN 2⋅ 3 2 ⋅ 3 4.1μH ⋅ 830kHz ⋅ 4.2V PESR = ESRCOUT ⋅ IRMS2 = 5mΩ ⋅ 0.0822A = 33μW 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter AAT1150 Dissipation P= = IO2 ⋅ (RDS(ON)H ⋅ VO + RDS(ON)L ⋅ (VIN -VO)) VIN (0.14Ω ⋅ 1.5V + 0.145Ω ⋅ (3.6V - 1.5V)) 3.6V + (tsw ⋅ FS ⋅ IO + IQ) ⋅ VIN + (20nsec ⋅ 830kHz ⋅ 1.0A + 0.3mA) ⋅ 3.6V = 0.203W TJ(MAX) = TAMB + ΘJA ⋅ PLOSS = 85°C + 150°C/W ⋅ 0.203W = 115°C Manufacturer Part Number Value Max DC Current DCR Taiyo Yuden Toko NPO5DB4R7M A914BYW-3R5M-D52LC CDRH5D28-4R2 CDRH5D18-4R1 LQH55DN4R7M03 LQH66SN4R7M03 4.7μH 3.5μH 4.2μH 4.1μH 1.4A 1.34A 2.2A 1.95A 2.7A 2.2A 0.038 0.073 0.031 0.057 0.041 0.025 Sumida Murata 4.7μH Size (mm) LxWxH 5.9 5.0 5.7 5.7 5.0 6.3 x x x x x x 6.1 5.0 5.7 5.7 5.0 6.3 x x x x x x 2.8 2.0 3.0 2.0 4.7 4.7 Type Shielded Non-Shielded Shielded Table 1: Surface Mount Inductors. Manufacturer Part Number Murata GRM40 X5R 106K 6.3 GRM42-6 X5R 106K 6.3 GRM21BR60J226ME39L GRM21BR60J106ME39L Value Voltage Temp. Co. 10μF 22μF 10μF 6.3V X5R Case 0805 1206 0805 Table 2: Surface Mount Capacitors. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201990A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 23, 2012 15 DATA SHEET AAT1150 1MHz 1A Step-Down DC/DC Converter Ordering Information Output Voltage Package Marking1 Part Number (Tape & Reel)2 1.0V (Adj VOUT ≥ 1.0V) MSOP-8 JZXYY AAT1150IKS-1.0-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information MSOP-8 4° ± 4° 4.90 ± 0.10 3.00 ± 0.10 1.95 BSC 0.95 REF 0.60 ± 0.20 PIN 1 3.00 ± 0.10 0.85 ± 0.10 0.95 ± 0.15 10° ± 5° GAUGE PLANE 0.254 BSC 0.155 ± 0.075 0.075 ± 0.075 0.65 BSC 0.30 ± 0.08 All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is held on part numbers listed in BOLD. Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. 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