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Technical content

Features

  • V IN Range: 2.7V to 5.5V
  • V OUT Adjustable Down to 0.6V ▪ Fixed or Adjustable Version
  • Fast Turn-On Time (100 μs Typical)
  • 25 μA No Load Quiescent Current
  • Up to 97% Efficiency
  • Output Current Up to 600mA
  • 1MHz Switching Frequency
  • Soft Start
  • Over-Temperature Protection
  • Current Limit Protection
  • 100% Duty Cycle Low-Dropout Operation
  • 0.1 μA Shutdown Current
  • SC70JW-8 Package
  • Temperature Range: -40°C to +85°C

Applications

  • Cellular Phones
  • Digital Cameras
  • Handheld Instruments
  • Microprocessor / DSP Core / IO Power
  • PDAs and Handheld Computers
  • USB Devices Typical Application (Fixed Output Voltage) 4.7μH 22μF 4.7μF EN OUT VIN LX AGND PGND PGND PGND AAT1123 VIN VO AAT1123 Efficiency (VOUT = 2.5V; L = 10μμH) Output Current (mA) Efficiency (%) 100 0.1 1 10 100 1000 VIN = 3.3V

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Pin Descriptions Pin # Symbol Function 1 EN Enable pin. 2 OUT Feedback input pin. This pin is connected either directly to the converter output or to an external resis- tive divider for an adjustable output. 3 VIN Input supply voltage for the converter. 4L X Switching node. Connect the inductor to this pin. It is internally connected to the drain of both high- and low-side MOSFETs. 5 AGND Non-power signal ground pin. 6, 7, 8 PGND Main power ground return pin. Connect to the output and input capacitor return. Pin Configuration SC70JW-8 (Top View) OUT VIN LX PGND PGND PGND AGND EN 1

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at c onditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. Absolute Maximum Ratings1 Symbol Description Value Units VIN Input Voltage GND 6.0 V VLX LX to GND -0.3 to VP + 0.3 V VOUT OUT to GND -0.3 to V P + 0.3 V VEN EN to GND -0.3 to 6.0 V TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at leads, 10 sec) 300 °C Thermal Information Symbol Description Value Units PD Maximum Power Dissipation (SC70JW-8) 625 mW JA Thermal Resistance2 (SC70JW-8) 160 °C/W

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 1. The AAT1123 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assu red by design, characterization, and correla- tion with statistical process controls. Electrical Characteristics1 TA = -40°C to +85°C, unless otherwise noted. Typical values are T A = 25°C, VIN = 3.6V. Symbol Description Conditions Min Typ Max Units Step-Down Converter VIN Input Voltage 2.7 5.5 V VUVLO UVLO Threshold VIN Rising 2.6 V Hysteresis 100 mV V IN Falling 1.8 V VOUT Output Voltage Tolerance I OUT = 0 to 600mA, VIN = 2.7V to 5.5V -3.5 +3.5 % VOUT Output Voltage Range 0.6 V IN V IQ Quiescent Current No Load, 0.6V Adjustable Version 25 50 μA ISHDN Shutdown Current EN = AGND = PGND 1.0 μA IOUT_X Maximum Load Current 600 mA RDS(ON)H High Side Switch On Resistance 0.45 Ω RDS(ON)L Low Side Switch On Resistance 0.40 Ω ILXLEAK LX Leakage Current V IN = 5.5V, VLX = 0 to VIN, EN = GND 1 μA VLinereg Line Regulation V IN = 2.7V to 5.5V 0.5 %/V VOUT Out Threshold Voltage Accuracy 0.6V Output, No Load, T A = 25°C 591 600 609 mV IOUT Out Leakage Current 0.6V Output 0.2 μA ROUT Out Impedance >0.6V Output 250 k Ω TS Start-Up Time From Enable to Output Regulation 100 μs FOSC Oscillator Frequency T A = 25°C 0.7 1.0 1.5 MHz TSD Over-Temperature Shutdown Threshold 140 °C THYS Over-Temperature Shutdown Hysteresis 15 °C EN VEN(L) Enable Threshold Low 0.6 V VEN(H) Enable Threshold High 1.4 V IEN Input Low Current V IN = VFB = 5.5V -1.0 1.0 μA

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Typical Characteristics Efficiency vs. Load (VOUT = 3.3V; L = 10μμH) Output Current (mA) Efficiency (%) 100 0.1 1 10 100 1000 VIN = 3.9V VIN = 4.2V DC Regulation (VOUT = 3.3V; L = 10μμH) Output Current (mA) Output Error (%) -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 0.1 1 10 100 1000 VIN = 4.2V VIN = 3.9V Efficiency vs. Load (VOUT = 2.5V; L = 10μμH) Output Current (mA) Efficiency (%) 100 0.1 1 10 100 1000 VIN = 3.0V VIN = 3.6V VIN = 3.3V DC Regulation (VOUT = 2.5V; L = 10μμH) Output Current (mA) Output Error (%) -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 0.1 1 10 100 1000 VIN = 3.6V VIN = 3.3V VIN = 3.0V Efficiency vs. Load (VOUT = 1.5V; L = 4.7μμH) Output Current (mA) Efficiency (%) 100 0.1 1 10 100 1000 VIN = 3.6V VIN = 4.2V VIN = 2.7V DC Regulation (VOUT = 1.5V; L = 4.7μμH) Output Current (mA) Output Error (%) -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 0.1 1 10 100 1000 VIN = 3.6V VIN = 4.2V VIN = 2.7V

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Typical Characteristics Frequency vs. Input Voltage (VOUT = 1.8V) Input Voltage (V) Frequency Variation (%) -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 Output Voltage Error vs. Temperature (VIN = 3.6V; VO = 2.5V) Temperature (°°C) Output Error (%) -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 2.0 1.5 -40 -20 0 20 40 60 80 100 Switching Frequency vs. Temperature (VIN = 3.6V; VO = 1.5V) Temperature (°°C) Variation (%) -0.20 -0.10 0.00 0.10 0.20 -40 -20 0 20 40 60 80 100 Quiescent Current vs. Input Voltage (VO = 1.8V) Input Voltage (V) Supply Current (μμA) 85°C 25°C -40°C P-Channel RDS(ON) vs. Input Voltage Input Voltage (V) RDS(ON) (mΩΩ) 300 350 400 450 500 550 600 650 700 750 25°C 120°C 100°C 85°C N-Channel RDS(ON) vs. Input Voltage Input Voltage (V) RDS(ON) (mΩΩ) 300 350 400 450 500 550 600 650 700 750 25°C 120°C 100°C 85°C

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Typical Characteristics Load Transient Response (30mA - 300mA; VIN = 3.6V; VOUT = 1.5V; C1 = 22μμF) Output Voltage (top) (V) Load and Inductor Current (200mA/div) (bottom) Time (25μs/div) 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 -0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 30mA 300mA Load Transient Response (30mA - 300mA; VIN = 3.6V; VOUT = 2.5V; C1 = 22μμF) Output Voltage (top) (V) Load and Inductor Current (200mA/div) (bottom) Time (25μs/div) 2.05 2.15 2.25 2.35 2.45 2.55 2.65 -0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 30mA 300mA Line Transient (VOUT = 2.5V @ 500mA) Output Voltage (top) (V) Input Voltage (bottom) (V) Time (25μμs/div) 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 Line Regulation (VOUT = 1.5V) Input Voltage (V) Accuracy (%) -0.5 0.5 1.5 2.5 3 3.5 4 4.5 5 5.5 6 IOUT = 600mA IOUT = 100mA IOUT = 10mA Output Ripple (VIN = 3.6V; VOUT = 1.8V; 400mA) Output Voltage (AC Coupled) (top) (mV) Inductor Current (bottom) (A) Time (250ns/div) -120 -100 -80 -60 -40 -20 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Soft Start (VIN = 3.6V; VOUT = 1.5V; L = 4.7μμH) Enable and Output Voltage (top) (V) Inductor Current (bottom) (A) Time (50μs/div) -4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Functional Block Diagram EN LX Err .Amp Logic DH DL PGND VINOUT AGND Voltage Reference INPUT See note Note: For adjustable version, the internal feedback divider is omitted and the FB pin is tied directly to the internal error amplifier. Functional Description The AAT1123 is a high performance 600mA 1MHz mono- lithic step-down converter. It has been designed with the goal of minimizing external component size and optimiz- ing efficiency over the complete load range. Apart from the small bypass input capacitor, only a small L-C filter is required at the output. Typically, a 4.7μH inductor and a 22μF ceramic capacitor are recommended (see Table of Values). The fixed output version requires only three external power components (C IN, COUT, and L). The adjustable ver- sion can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage. An addi- tional feed-forward capacitor can also be added to the external feedback to provide improved transient response (see Figure 1). At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the R DSON drop of the P-channel high-side MOSFET. The input voltage range is 2.7V to 5.5V. The converter efficiency has been optimized for all load conditions, ranging from no load to heavy load. The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Soft start eliminates any output voltage overshoot when the enable or the input voltage is applied.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Control Loop The AAT1123 is a peak current mode step-down con- verter. The current through the P-channel MOSFET (high side) is sensed for current loop control, as well as short circuit and overload protection. A fixed slope compensa- tion signal is added to the sensed current to maintain stability for duty cycles greater than 50%. The peak cur- rent mode loop appears as a voltage-programmed cur- rent source in parallel with the output capacitor. The output of the voltage error amplifier programs the current mode loop for the necessary peak switch current to force a constant output voltage for all load and line conditions. Internal loop compensation terminates the transconductance voltage error amplifier output. For fixed voltage versions, the error amplifier reference volt- age is internally set to program the converter output voltage. For the adjustable output, the error amplifier reference is fixed at 0.6V. Soft Start / Enable Soft start limits the current surge seen at the input and eliminates output voltage overshoot. When pulled low, the enable input forces the AAT1123 into a low-power, non-switching state. The total input current during shut- down is less than 1 μA. The AAT1123 provides turn-on within 100μs (typical) of the enable input transition. Current Limit and Over-Temperature Protection For overload conditions, the peak input current is limit- ed. To minimize power dissipation and stresses under current limit and short-circuit conditions, switching is terminated after entering current limit for a series of pulses. Switching is terminated for seven consecutive clock cycles after a current limit has been sensed for a series of four consecutive clock cycles. Thermal protection completely disables switching when internal dissipation becomes excessive. The junction over-temperature threshold is 140°C with 15°C of hys- teresis. Once an over-temperature or over-current fault conditions is removed, the output voltage automatically recovers. Under-Voltage Lockout Internal bias of all circuits is controlled via the VIN input. Under-voltage lockout (UVLO) guarantees sufficient V IN bias and proper operation of all internal circuitry prior to activation. L1 CDRH3D16-4R7 4.7μH 22μF 4.7μF U1 AAT1123 SC70JW-8 C1 22μF 6.3V 0805 X5R C2 4.7μF 6.3V 0805 X5R VOUT GND VIN Enable LX EN1 OUT2 VIN3 LX4 AGND 5 PGND 6 PGND 7 PGND 8 AAT1123 GND2 118kR1 C4 100pF 59k Figure 1: Enhanced Transient Response Schematic.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Applications Information Inductor Selection The step-down converter uses peak current mode control with slope compensation to maintain stability for duty cycles greater than 50%. The output inductor value must be selected so the inductor current down slope meets the internal slope compensation requirements. The internal slope compensation for the adjustable and low-voltage fixed versions of the AAT1123 is 0.24A/μsec. This equates to a slope compensation that is 75% of the inductor cur- rent down slope for a 1.5V output and 4.7μH inductor. 0.75 ⋅ VO m = = = 0.24 L 0.75 ⋅ 1.5V 4.7µH A µsec This is the internal slope compensation for the adjust- able (0.6V) version or low-voltage fixed versions. When externally programming the 0.6V version to 2.5V, the calculated inductance is 7.5μH. = 3 ⋅ 2.5V = 7.5µH m 0.75 ⋅ VO 0.24A µsec A µsec A A µsec In this case, a standard 10μH value is selected. For high-voltage fixed versions (2.5V and above), m = 0.48A/μsec. Table 1 displays inductor values for the AAT1123 fixed and adjustable options. 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 satura- tion characteristics. The inductor should not show any appreciable saturation under normal load conditions. Some inductors may meet the 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. The 4.7 μH CDRH3D16 series inductor selected from Sumida has a 105m DCR and a 900mA DC current rat- ing. At full load, the inductor DC loss is 17mW which gives a 2.8% loss in efficiency for a 400mA, 1.5V output. Input Capacitor Select a 4.7μF to 10μF X7R or X5R ceramic capacitor for the input. To estimate the required input capacitor size, determine the acceptable input ripple level (V PP) and solve for C. The calculated value varies with input voltage and is a maximum when V IN is double the output voltage. VO VIN CIN = VO VIN VPP IO VO VIN VO VIN CIN(MIN) = 1 VPP IO Always examine the ceramic capacitor DC voltage coef- ficient characteristics when selecting the proper value. For example, the capacitance of a 10μF, 6.3V, X5R ceram- ic capacitor with 5.0V DC applied is actually about 6μF. Confi guration Output Voltage Inductor Slope Compensation 0.6V Adjustable With External Resistive Divider 0.6V to 2.0V 4.7μH 0.24A/ μsec 2.5V to 3.3V 10μH 0.24A/ μsec Fixed Output 0.6V to 2.0V 4.7μH 0.24A/ μsec 2.5V to 3.3V 4.7μH 0.48A/ μsec Table 1: Inductor Values. The maximum input capacitor RMS current is: VO VIN VO VIN The input capacitor RMS ripple current varies with the input and output voltage and will always be less than or equal to half of the total DC load current. VO VIN VO VIN

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Since the inductance of a short PCB trace feeding the input voltage is significantly lower than the power leads from the bench power supply, most applications do not exhibit this problem. In applications where the input power source lead induc- tance cannot be reduced to a level that does not affect the converter performance, a high ESR tantalum or alu- minum electrolytic should be placed in parallel with the low ESR, ESL bypass ceramic. This dampens the high Q network and stabilizes the system. Output Capacitor The output capacitor limits the output ripple and pro- vides holdup during large load transitions. A 22μF X5R or X7R ceramic capacitor provides sufficient bulk capaci- tance to stabilize the output during large load transitions and has the ESR and ESL characteristics necessary for low output ripple. The output voltage droop due to a load transient is dominated by the capacitance of the ceramic output capacitor. During a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. Within two or three switching cycles, the loop responds and the inductor current increases to match the load current demand. The rela- tionship of the output voltage droop during the three switching cycles to the output capacitance can be esti- mated by: COUT = 3 · ΔILOAD VDROOP · FS Once the average inductor current increases to the DC load level, the output voltage recovers. The above equa- tion establishes a limit on the minimum value for the output capacitor with respect to load transients. The internal voltage loop compensation limits the mini- mum output capacitor value to 22 μF. This is due to its effect on the loop crossover frequency (bandwidth), phase margin, and gain margin. Increased output capac- itance will reduce the crossover frequency with greater phase margin. The maximum output capacitor RMS ripple current is given by: VOUT · (VIN(MAX) - VOUT) RMS(MAX)I L · F · VIN(MAX) Dissipation due to the RMS current in the ceramic output capacitor ESR is typically minimal, resulting in less than a few degrees rise in hot-spot temperature. Adjustable Output Resistor Selection For applications requiring an adjustable output voltage, the 0.6V version can be externally programmed. Resistors R1 and R2 of Figure 5 program the output to regulate at a voltage higher than 0.6V. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum sug- gested value for R2 is 59k. Although a larger value will further reduce quiescent current, it will also increase the impedance of the feedback node, making it more sensi- tive to external noise and interference. Table 2 summa- rizes the resistor values for various output voltages with R2 set to either 59k for good noise immunity or 221k for reduced no load input current. VOUT VREF 1.5V 0.6V The adjustable version of the AAT1123, combined with an external feedforward capacitor (C4 in Figure 1), delivers enhanced transient response for extreme pulsed load applications. The addition of the feedforward capacitor typically requires a larger output capacitor C1 for stability. VOUT (V) R2 = 59kΩ R1 (kΩ) R2 = 221kΩ R1 (kΩ) 0.8 19.6 75 0.9 29.4 113 1.0 39.2 150 1.1 49.9 187 1.2 59.0 221 1.3 68.1 261 1.4 78.7 301 1.5 88.7 332 1.8 118 442 1.85 124 464 2.0 137 523 2.5 187 715 3.3 267 1000 Table 2: Adjustable Resistor Values For Use With 0.6V Step-Down Converter.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Thermal Calculations There are three types of losses associated with the AAT1123 step-down converter: switching losses, con- duction losses, and quiescent current losses. Conduction losses are associated with the R DS(ON) characteristics of the power output switching devices. Switching losses are dominated by the gate charge of the power output switching devices. At full load, assuming continuous con- duction mode (CCM), a simplified form of the losses is given by: PTOTAL IO 2 · (RDSON(HS) · VO + RDSON(LS) · [VIN - VO]) VIN + (tsw · F · IO + IQ) · VIN IQ is the step-down converter quiescent current. The term tsw is used to estimate the full load step-down con- verter switching losses. For the condition where the step-down converter is in dropout at 100% duty cycle, the total device dissipation reduces to: PTOTAL = IO 2 · RDSON(HS) + IQ · VIN Since RDS(ON), quiescent current, and switching losses all vary with input voltage, the total losses should be inves- tigated over the complete input voltage range. Given the total losses, the maximum junction tempera- ture can be derived from the  JA for the SC70JW-8 pack- age which is 160°C/W. TJ(MAX) = PTOTAL · ΘJA + TAMB Layout The suggested PCB layout for the AAT1123 is shown in Figures 2, 3, and 4. The following guidelines should be used to help ensure a proper layout. 1. The input capacitor (C2) should connect as closely as possible to V IN (Pin 3) and PGND (Pins 6-8). 2. C1 and L1 should be connected as closely as possi- ble. The connection of L1 to the LX pin should be as short as possible. 3. The feedback trace or OUT pin (Pin 2) should be separate from any power trace and connect as close- ly as possible to the load point. Sensing along a high-current load trace will degrade DC load regula- tion. If external feedback resistors are used, they should be placed as closely as possible to the OUT pin (Pin 2) to minimize the length of the high imped- ance feedback trace. 4. The resistance of the trace from the load return to PGND (Pins 6-8) should be kept to a minimum. This will help to minimize any error in DC regulation due to differences in the potential of the internal signal ground and the power ground. L1 CDRH3D16-4R7 4.7μH 22μF 4.7μF U1 AAT1123 SC70JW-8 C1 22μF 6.3V 0805 X5R C2 4.7μF 6.3V 0805 X5R VOUT GND VIN Enable LX EN1 OUT2 VIN3 LX4 AGND 5 PGND 6 PGND 7 PGND 8 AAT1123 GND2 118kR1 59k Figure 5: AAT1123 Adjustable Evaluation Board Schematic.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 Step-Down Converter Design Example Specifications VO = 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load ILOAD = 300mA VIN = 2.7V to 4.2V (3.6V nominal) FS = 1.0MHz TAMB = 85°C 1.8V Output Inductor L1 = 3 ⋅ VO2 = 3 ⋅ 1.8V = 5.4μHμsec A μsec A (see Table 1) For Sumida inductor CDRH3D16, 4.7μH, DCR = 105m. IPKL1 = IO + ΔIL1 PL1 = IO 2 ⋅ DCR = 0.4A2 ⋅ 105mΩ = 17mW 1.8V Output Capacitor VDROOP = 0.05V 4.7μH · 1.0MHz · 4.2V 23 RMSI L1 · F · VIN(MAX) = · 3 · ΔILOAD VDROOP · FS 3 · 0.3A 0.05V · 1MHz COUT = = = 18.0 μF

  • = 63mArms (VO) · (VIN(MAX) - VO) = Pesr = esr · IRMS 2 = 5mΩ · (63mA)2 = 20μW Input Capacitor Input Ripple VPP = 25mV CIN = = = 4.75µF 1 VPP IO 25mV 0.4A IO RMSI P = esr · IRMS 2= = 0.2Arms

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 AAT1123 Losses PTOTAL + (tsw · F · IO + IQ) · VIN IO 2 · (RDSON(HS) · VO + RDSON(LS) · [VIN -VO]) VIN + (5ns · 1.0MHz · 0.4A + 50μA) · 4.2V = 122mW 4.2V TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + (160°C/W) · 122mW = 104.5°C

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 1. For reduced quiescent current R2 = 221k . VOUT (V) Adjustable Version (0.6V device) R1 (k) R2 = 59kΩ R1 (k) R2 = 221kΩ1 L1 (μH) 0.8 19.6 75.0 4.7 0.9 29.4 113 4.7 1.0 39.2 150 4.7 1.1 49.9 187 4.7 1.2 59.0 221 4.7 1.3 68.1 261 4.7 1.4 78.7 301 4.7 1.5 88.7 332 4.7 1.8 118 442 4.7 1.85 124 464 4.7 2.0 137 523 4.7 or 6.8 2.5 187 715 10 3.3 267 1000 10 VOUT (V) Fixed Version R1 (kΩ) R2 Not Used L1 ( μH) 0.6-3.3V 0 4.7 Table 3: Evaluation Board Component Values. Manufacturer Part Number Inductance (μH) Max DC Current (A) DCR () Size (mm) LxWxH Type Table 4: Typical Surface Mount Inductors. Manufacturer Part Number Value Voltage Temp. Co. Case Murata GRM21BR60J226ME39 22 μF 6.3V X5R 0805 TDK C2012X5R0J226K 22 μF 6.3V X5R 0805 Taiyo Yuden JMK212BJ226KL 22 μF 6.3V X5R 0805 Table 5: Surface Mount Capacitors.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013 1. Contact Sales for other voltage options. 2. XYY = assembly and date code. 3. Sample stock is generally held on part numbers listed in BOLD.

Ordering Information

Output Voltage1 Package Marking 2 Part Number (Tape and Reel)3 0.6 SC70JW-8 PMXYY AAT1123IJS-0.6-T1

1.5 SC70JW-8

1.8 SC70JW-8

2.5 SC70JW-8

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

0.225 ± 0.075 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 2.00 ± 0.20 7° ± 3° 4° ± 4° 0.15 ± 0.05

1.10 MAX

0.100 2.20 ± 0.20 0.048REF 0.50 BSC 0.50 BSC 0.50 BSC All dimensions in millimeters.

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