DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump General Description Features The AAT3111 ChargePump is a MicroPower switched capacitor voltage converter that delivers a regulated output. No external inductor is required for operation. Using three small capacitors, the AAT3111 can deliver up to 150mA to the voltage regulated output. The AAT3111 features very low quiescent current and high efficiency over a large portion of its load range, making this device ideal for battery-powered applications. Furthermore, the combination of few external components and small package size keeps the total converter board area to a minimum in space-restricted applications. • Step-Up Type Voltage Converter • Input Voltage Range: ▪ AAT3111-3.6: 1.8V to 3.6V ▪ AAT3111-3.3: 1.8V to 3.3V • MicroPower Consumption: 20µA • 3.6V, 3.3V Regulated ±4% Output • 3.6V Output Current ▪ 100mA with VIN ≥ 3.0V ▪ 20mA with VIN ≥ 2.0V • 3.3V Output Current ▪ 100mA with VIN ≥ 2.5V ▪ 20mA with VIN ≥ 1.8V • High Frequency 750kHz Operation • Shutdown Mode Draws Less Than 1µA • Short-Circuit/Over-Temperature Protection • 2kV ESD Rating • SC70JW-8 or SOT23-6 Package The AAT3111 operates in an output-regulated voltage doubling mode. The regulator uses a pulse-skipping technique to provide a regulated output from a varying input supply. The AAT3111 contains a thermal management circuit to protect the device under continuous output short-circuit conditions. The AAT3111 is available in a Pb-free, surface-mount 6-pin SOT23 or 8-pin SC70JW package and is rated over the -40°C to +85°C temperature range. Applications • Battery Back-Up Supplies • Digital Cameras • Handheld Electronics • MP3 Players •PDAs Typical Application AAT3111 VOUT VOUT C+ GND VIN COUT 10uF ON/OFF SHDN C- 1uF VIN CIN 10uF Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 1 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Pin Descriptions Pin # SOT23-6 SC70JW-8 Symbol 1 1 VOUT 2 3 4 5 6 2, 3, 4 5 6 7 8 GND SHDN CVIN C+ Function Regulated output pin. Bypass this pin to ground with at least 6.8µF low Equivalent Series Resistance (ESR) capacitor. Ground connection. Shutdown input. Logic low signal disables the converter. Flying capacitor negative terminal. Input supply pin. Bypass this pin to ground with at least 6.8µF low ESR capacitor. Flying capacitor positive terminal. Pin Configuration SOT23-6 (Top View) VOUT 2 C+ 1 6 GND 2 5 VIN SHDN 3 4 C- SC70JW-8 (Top View) VOUT GND GND GND 1 8 2 7 3 6 4 5 C+ VIN CSHDN Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol VIN VOUT VSHDN tSC TJ TLEAD VESD Description VIN to GND VOUT to GND SHDN to GND Output to GND Short-Circuit Duration Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec.) ESD Rating2 — HBM Value Units -0.3 to 6 -0.3 to 6 -0.3 to 6 Indefinite -40 to 150 300 2000 V V V s °C °C V Rating Units 150 667 °C/W mW Thermal Information3 Symbol QJA PD Description Maximum Thermal Resistance Maximum Power Dissipation 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. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin. 3. Mounted on an FR4 board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 3 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Electrical Characteristics TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C, CFLY = 1µF, CIN = 10µF, COUT = 10µF. Symbol Description AAT3111-3.3 VIN Input Voltage IQ No Load Supply Current1 VOUT Output Voltage ISHDN Shutdown Supply Current VRIPPLE Ripple Voltage h Efficiency fOSC Frequency VIH SHDN Input Threshold High VIL SHDN Input Threshold Low IIH SHDN Input Current High IIL SHDN Input Current Low tON VOUT Turn-On Time ISC Short-Circuit Current2 AAT3111-3.6 VIN Input Voltage IQ No Load Supply Current1 VOUT Output Voltage ISHDN Shutdown Supply Current VRIPPLE Ripple Voltage h fOSC VIH VIL IIH IIL tON ISC Efficiency Frequency SHDN Input Threshold High SHDN Input Threshold Low SHDN Input Current High SHDN Input Current Low VOUT Turn-On Time Short-Circuit Current2 Conditions Min VOUT = 3.3V 1.8V < VIN < 3.3V, IOUT = 0mA, SHDN = VIN 1.8V < VIN < 3.3V, IOUT = 20mA 2.5V < VIN < 3.3V, IOUT = 100mA 1.8V < VIN < 3.3V, IOUT = 0mA, VSHDN = 0 VIN = 2.0V, IOUT = 50mA VIN = 1.8V, IOUT = 25mA Oscillator Free Running Typ 1.8 3.17 3.17 20 3.30 3.30 0.01 20 91 750 Max Units VOUT 30 3.43 3.43 1 V µA 1.4 SHDN = VIN SHDN = GND VIN = 1.8V, IOUT = 0mA VIN = 1.8V, VOUT = GND, SHDN = 3V -1 -1 VOUT = 3.6V 1.8V < VIN < 3.6V, IOUT = 2.0V < VIN < 3.6V, IOUT ≤ 3.0V < VIN < 3.6V, IOUT ≤ 1.8V < VIN < 3.6V, IOUT = VIN = 2.5V, IOUT = 50mA VIN = 3V, IOUT = 100mA VIN = 2.0V, IOUT = 20mA Oscillator Free Running 1.8 0mA, SHDN = VIN 20mA 100mA 0mA, VSHDN = 0 0.3 1 1 0.2 300 3.46 3.46 20 3.6 3.6 0.01 25 30 90 750 VOUT 30 3.74 3.74 1 0.3 1 1 -1 -1 0.2 300 1. Under short-circuit conditions, the device may enter over-temperature protection mode. 2. IQ = IVIN + IVOUT. VOUT is pulled up to 3.8V to prevent switching. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 µA mVP-P % kHz V V µA µA ms mA V µA V µA mVP-P 1.4 SHDN = VIN SHDN = GND VIN = 1.8V, IOUT = 0mA VIN = 1.8V, VOUT = GND, SHDN = 3V V % kHz V V µA µA ms mA DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Typical Characteristics — AAT3111-3.3 Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C. Output Voltage vs. Output Current Supply Current vs. Supply Voltage 60 3.35 Supply Current (µA) Output Voltage (V) 3.40 VIN = 2.3V VIN = 2.6V 3.30 VIN = 2.0V 3.25 VIN = 1.7V 3.20 No Load, Switching 40 30 20 No Load, Not Switching 10 0 95 90 0.1 1 10 100 1000 1.5 2.5 3.0 Supply Voltage (V) Efficiency vs. Supply Voltage Efficiency vs. Load Current 3.5 100 5mA 85 90 50mA 80 75 70 100mA 65 60 VIN = 1.8V 80 VIN = 2.0V 70 60 VIN = 2.6V 50 40 30 20 10 55 50 1.8 2.0 Output Current (mA) Efficiency (%) 0.01 Efficiency (%) 50 2.0 2.2 2.4 2.6 2.8 0 0.01 3.0 0.1 1 10 100 Load Current (mA) Supply Voltage (V) Startup VSHDN Threshold vs. Supply Voltage VOUT (1V/div) ILOAD = 100mA VIN = 2.3V ILOAD = 50mA VIN = 2.0V ILOAD = 25mA VIN = 2.0V VSHDN Threshold (V) 0.9 SHDN (2V/div) 0.8 VIH 0.7 0.6 VIL 0.5 0.4 1.5 Time (100µs/div) 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 Supply Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 5 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Typical Characteristics — AAT3111-3.3 Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C. Load Transient Response Load Transient Response (VIN = 2.6V) (VIN = 2.0V) IOUT (20mA/div) IOUT (50mA/div) VOUT AC Coupled (20mV/div) VOUT AC Coupled (20mV/div) Time (50µs/div) Time (50µs/div) Output Ripple Output Ripple (IOUT = 100mA; VIN = 2.5V) VOUT AC Coupled (10mV/div) VOUT AC Coupled (10mV/div) (IOUT = 50mA; VIN = 2.0V) Time (2µs/div) Time (1µs/div) 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Typical Characteristics — AAT3111-3.6 Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C. Supply Current vs. Supply Voltage Output Voltage vs. Output Current 60 3.70 Supply Current (µA) Ooutput Voltage (V) 3.75 VIN = 2.9V 3.65 3.60 3.55 VIN = 2.3V VIN = 2.0V 3.50 3.45 0.01 50 No Load, Switching 40 30 20 No Load, Not Switching 10 0 0.1 1 10 100 1.6 1000 2.1 3.6 100 100 90 50mA 100mA 90 85 80 10mA 75 VIN = 2.0V 80 Efficiency (%) 95 Efficiency (%) 3.1 Efficiency vs. Load Current Efficiency vs. Supply Voltage 70 65 60 70 60 VIN = 2.3V 50 40 VIN = 2.6V 30 20 10 55 50 2.6 Supply Voltage (V) Output Current (mA) 0 1.8 2.0 2.2 2.4 2.6 2.8 3.0 0.01 3.2 0.1 1 10 100 Load Current (mA) Supply Voltage (V) Startup VSHDN Threshold vs. Supply Voltage SHDN (2V/div) VOUT (1V/div) ILOAD = 100mA VIN = 2.1V ILOAD = 50mA VIN = 2.1V VSHDN Threshold (V) 0.9 0.8 VIH 0.7 0.6 VIL 0.5 0.4 1.5 Time (100µs/div) 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 Supply Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 7 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Typical Characteristics — AAT3111-3.6 Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C. Load Transient Response Load Transient Response (VIN = 2.4V) (VIN = 2.1V) IOUT (20mA/div) IOUT (50mA/div) VOUT AC Coupled (20mV/div) VOUT AC Coupled (20mV/div) Time (50µs/div) Time (50µs/div) Output Ripple Output Ripple (IOUT = 100mA; VIN = 3.0V) VOUT AC Coupled (10mV/div) VOUT AC Coupled (10mV/div) (IOUT = 50mA; VIN = 2.5V) Time (1µs/div) Time (2µs/div) 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Functional Block Diagram VIN S2 SHDN S1 CONTROL C+ CVREF S4 S3 VOUT + GND Functional Description Operation (Refer to block diagram) The AAT3111 uses a switched capacitor charge pump to boost an input voltage to a regulated output voltage. Regulation is achieved by sensing the charge pump output voltage through an internal resistor divider network. A switched doubling circuit is enabled when the divided output drops below a preset trip point controlled by an internal comparator. The charge pump switch cycling enables four internal switches at two non-overlapping phases. During the first phase, switches S1 and S4 are switched on (short) and switches S2 and S3 are off (open). The flying capacitor CFLY is charged to a level approximately equal to input voltage VIN. On the second phase, switches S1 and S4 are turned off (open), and S2 and S3 are turned on (short). The low side of the flying capacitor CFLY is connected to GND during the first phase. During the second phase, the flying capacitor CFLY is switched so that the low side is connected to VIN. The voltage at the high side of the flying capacitor CFLY is bootstrapped to 2VIN and is connected to the output through switch S3. For each cycle phase, charge from input node VIN is transported from a lower voltage to a higher voltage. This cycle repeats itself until the output node voltage is high enough to exceed the preset input threshold of the control comparator. When the output voltage exceeds the internal trip point level, the switching cycle stops and the charge pump circuit is temporarily placed in an idle state. When idle, the AAT3111 has a quiescent current of 20µA or less. The closed loop feedback system containing the voltage sense circuit and control comparator allows the AAT3111 to provide a regulated output voltage to the limits of the input voltage and output load current. The switching signal, which drives the charge pump, is created by an integrated oscillator within the control circuit block. The free-running charge pump switching frequency is approximately 750kHz. The switching frequency under a load is a function of VIN, VOUT, COUT, and IOUT. For each phase of the switching cycle, the charge transported from VIN to VOUT can be approximated by the following formula: VPHASE ≈ CFLY · (2 · VIN · VOUT) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 9 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump The relative average current that the charge pump can supply to the output may be approximated by the following expression: IOUT(AVG) α CFLY · (2 · VIN · VOUT) · FS The AAT3111 has complete output short-circuit and thermal protection to safeguard the device under extreme operating conditions. An internal thermal protection circuit senses die temperature and will shut down the device if the internal junction temperature exceeds approximately 145°C. The charge pump will remain disabled until the fault condition is relieved. External Capacitor Selection Careful selection of the three external capacitors CIN, COUT, and CFLY is very important because they will affect turn-on time, output ripple, and transient performance. Optimum performance will be obtained when low ESR ceramic capacitors are used. In general, low ESR may be defined as less than 100mW. If desired for a particular application, low ESR tantalum capacitors may be substituted; however, optimum output ripple performance may not be realized. Aluminum electrolytic capacitors are not recommended for use with the AAT3111 due to their inherent high ESR characteristic. Typically as a starting point, a capacitor value of 10µF should be used for CIN and COUT with 1mF for CFLY when the AAT3111 is used under maximum output load conditions. Lower values for CIN, COUT, and CFLY may be utilized for light load current applications. Applications drawing a load current of 10mA or less may use a CIN and COUT capacitor value as low as 1µF and a CFLY value of 0.1µF. CIN and COUT may range from 1µF for light loads to 10µF or more for heavy output load conditions. CFLY may range from 0.01µF to 2.2µF or more. If CFLY is increased, COUT should also be increased by the same ratio to minimize output ripple. As a basic rule, the ratio between CIN, COUT, and CFLY should be approximately 10 to 1. The compromise for lowering the value of CIN, COUT, and the flying capacitor CFLY is the output ripple voltage may be increased. In any case, if the external capacitor values deviate greatly from the recommendation of CIN = COUT = 10µF and CFLY = 1µF, the AAT3111 output performance should be evaluated to assure the device meets application requirements. In applications where the input voltage source has very low impedance, it is possible to omit the CIN capacitor. However, if CIN is not used, circuit performance should be evaluated to assure desired operation is achieved. Under high peak current operating conditions that are typically 10 experienced during circuit start-up or when load demands create a large inrush current, poor output voltage regulation can result if the input supply source impedance is high, or if the value of CIN is too low. This situation can be remedied by increasing the value of CIN. Capacitor Characteristics Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3111. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is nonpolarized. Low ESR ceramic capacitors help maximize charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Equivalent Series Resistance: ESR is a very important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor that is caused by the leads, internal connections, size or area, material composition, and ambient temperature. Typically capacitor ESR is measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials: Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance and are very stable over temperature. Larger capacitor values are usually composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors (i.e., greater than 2.2µF) are often available in low-cost Y5V and Z5U dielectrics. If these types of capacitors are selected for use with the charge pump, the nominal value should be doubled to compensate for the capacitor tolerance which can vary more than ±50% over the operating temperature range of the device. A 10µF Y5V capacitor could be reduced to less than 5µF over temperature; this could cause problems for circuit operation. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors that are physically large will have a lower ESR when compared to an equivalent material smaller capacitor. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Charge Pump Efficiency The AAT3111 is a regulated output voltage doubling charge pump. The efficiency (h) can simply be defined as a linear voltage regulator with an effective output voltage that is equal to two times the input voltage. Efficiency (h) for an ideal voltage doubler can typically be expressed as the output power divided by the input power. η= POUT PIN In addition, with an ideal voltage doubling charge pump, the output current may be expressed as half the input current. The expression to define the ideal efficiency (h) can be rewritten as: η= POUT VOUT · IOUT V = = OUT PIN VIN · 2IOUT 2VIN -or- η(%) = 100 VOUT 2VIN For a charge pump with an output of 3.3V and a nominal input of 1.8Vs, the theoretical efficiency is 91.6%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at 91%. These figures are in close agreement for output load conditions from 1mA to 100mA. Efficiency will decrease as load current drops below 0.05mA or when the level of VIN approaches VOUT. Refer to the Typical Char acteristics section for measured plots of efficiency versus input voltage and output load current for the given charge pump output voltage options. Short-Circuit and Thermal Protection In the event of a short-circuit condition, the charge pump can draw as much as 100mA to 400mA of current from VIN. This excessive current consumption due to an output short-circuit condition will cause a rise in the internal IC junction temperature. The AAT3111 has a thermal protection and shutdown circuit that continuously monitors the IC junction temperature. If the thermal protection circuit senses the die temperature exceeding approximately 145°C, the thermal shutdown will disable the charge pump switching cycle operation. The thermal limit system has 10°C of system hysteresis before the charge pump can reset. Once the over-current event is removed from the output and the junction temperature drops below 135°C, the charge pump will then become active again. The thermal protection system will cycle on and off if an output short-circuit condition persists. This will allow the AAT3111 to operate indefinitely in a short-circuit condition without damage to the device. Output Ripple and Ripple Reduction There are several factors that determine the amplitude and frequency of the charge pump output ripple, the values of COUT and CFLY, the load current IOUT, and the level of VIN. Ripple observed at VOUT is typically a sawtooth waveform in shape. The ripple frequency will vary depending on the load current IOUT and the level of VIN. As VIN increases, the ability of the charge pump to transfer charge from the input to the output becomes greater; as it does, the peak-to-peak output ripple voltage will also increase. The size and type of capacitors used for CIN, COUT, and CFLY have an effect on output ripple. Since output ripple is associated with the R/C charge time constant of these two capacitors, the capacitor value and ESR will contribute to the resulting charge pump output ripple. This is why low ESR capacitors are recommended for use in charge pump applications. Typically, output ripple is not greater than 35mVP-P when VIN = 2.0V, VOUT = 3.3V, COUT = 10µF, and CFLY = 1µF. When the AAT3111 is used in light output load applications where IOUT < 10mA, the flying capacitor CFLY value can be reduced. The reason for this effect is when the charge pump is under very light load conditions, the transfer of charge across CFLY is greater during each phase of the switching cycle. The result is higher ripple seen at the charge pump output. This effect will be reduced by decreasing the value of CFLY. Caution should be observed when decreasing the flying capacitor. If the output load current rises above the nominal level for the reduced CFLY value, charge pump efficiency can be compromised. There are several methods that can be employed to reduce output ripple depending upon the requirements of a given application. The most simple and straightforward technique is to increase the value of the COUT capacitor. The nominal 10µF COUT capacitor can be increased to 22µF or more. Larger values for the COUT capacitor (22µF and greater) will by nature have lower ESR and can improve both high and low frequency components of the charge pump output ripple response. If a higher value tantalum capacitor is used for COUT to reduce low frequency ripple elements, a small 1µF low Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 11 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump ESR ceramic capacitor should be added in parallel to the tantalum capacitor (see Figure 1). The reason for this is tantalum capacitors typically have higher ESR than equivalent value ceramic capacitors and are less able to reduce high-frequency components of the output ripple. The only disadvantage to using large values for the COUT capacitor is the AAT3111 device turn-on time and inrush current may be increased. If additional ripple reduction is desired, an R/C filter can be added to the charge pump output in addition to the COUT capacitor (see Figure 2). An R/C filter will reduce output ripple by primarily attenuating high frequency components of the output ripple waveform. The low frequency break point for the R/C filter will significantly depend on the capacitor value selected. VOUT (3.3V) COUT2 1µF COUT1 22µF + VOUT High charge pump switching frequencies and large peak transient currents mandate careful printed circuit board layout. As a general rule for charge pump boost converters, all external capacitors should be located as closely as possible to the device package with minimum length trace connections. Maximize the ground plane around the AAT3111 charge pump and make sure all external capacitors are connected to the immediate ground plane. A local component side ground plane is recommended. If this is not possible due the layout design limitations, assure good ground connections by the use of large or multiple PCB vias. Refer to the AAT3111 evaluation board for an example of good charge pump layout design (Figures 3 through 5). C+ AAT3111 GND ON/OFF Layout Considerations SHDN CFLY 1µF VIN + C- CIN 10µF VIN (1.8V to 3.3V) Figure 1: Application Using Tantalum Capacitor. VOUT (3.3V) RFILTER 1.5Ω CFILTER 33µF COUT 10µF ON/OFF VOUT C+ AAT3111 GND SHDN VIN C- CFLY 1µF CIN 10µF VIN (1.8V to 3.3V) Figure 2: Application With Output Ripple Reduction Filter. 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Figure 3: Evaluation Board Top Side Silk Screen Layout / Assembly Drawing. Figure 4: Evaluation Board Component Side Layout. Figure 5: Evaluation Board Solder Side Layout. Typical Application Circuit VOUT COUT 10µF VOUT AAT3111 GND ON/OFF C+ SHDN VIN C- CFLY 1µF CIN 10µF VIN Figure 6: Typical Charge Pump Boost Converter Circuit. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 13 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump Ordering Information Output Voltage Package Marking1 Part Number (Tape and Reel)2 3.3V 3.6V 3.3V 3.6V SOT23-6 SOT23-6 SC70JW-8 SC70JW-8 BPXYY BOXYY BPXYY BOXYY AAT3111IGU-3.3-T1 AAT3111IGU-3.6-T1 AAT3111IJS-3.3-T1 AAT3111IJS-3.6-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 SOT23-6 2.85 ± 0.15 1.90 BSC 2.80 ± 0.20 0.15 ± 0.07 4° ± 4° 10° ± 5° 1.20 ± 0.25 1.10 ± 0.20 0.075 ± 0.075 1.575 ± 0.125 0.95 BSC 0.40 ± 0.10 × 6 0.60 REF 0.45 ± 0.15 GAUGE PLANE 0.10 BSC All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 DATA SHEET AAT3111 MicroPowerTM Regulated Charge Pump SC70JW-8 2.20 ± 0.20 1.75 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 ± 0.075 2.00 ± 0.20 0.100 0.15 ± 0.05 0.45 ± 0.10 4° ± 4° 0.05 ± 0.05 7° ± 3° 1.10 MAX 0.85 ± 0.15 0.048REF 2.10 ± 0.30 All dimensions in millimeters. Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202127A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012 15