DATA SHEET AAT1110: Fast Transient 800 mA Step-Down Converter Applications Description The AAT1110 SwitchReg is a member of Skyworks Total Cellular phones Power Management IC (TPMIC) product family. It is a 1.4 MHz Digital cameras step-down converter with an input voltage range of 2.7 V to 5.5 V Handheld instruments and output as low as 0.6 V. Its low supply current, small size, and high switching frequency make the AAT1110 the ideal choice for Microprocessor/DSP core/IO power portable applications. PDAs and handheld computers The AAT1110 is available in either a fixed version with internal USB devices feedback or a adjustable version with external feedback resistors. It can deliver up to 800 mA of load current while maintaining a low 27 A no-load quiescent current. The 1.4 MHz switching Features frequency minimizes the size of external components while VIN range: 2.7 V to 5.5 V keeping switching losses low. The AAT1110 has excellent load VOUT fixed or adjustable from 0.6 V to VIN regulation and transient response with a small output inductor and capacitor. 27 A no-load quiescent current The AAT1110 is designed to maintain high efficiency throughout Output current up to 800 mA the operating range and provides fast turn-on time. 1.4 MHz switching frequency The AAT1110 is available in a space-saving 2.0 mm 2.2 mm 120 s soft start SC70JW-8 package and is rated over the 40 C to +85 C Fast load transient temperature range. Over-temperature protection A typical application circuit is shown in Figure 1. The pin configuration is shown in Figure 2. Signal pin assignments and Current limit protection functional pin descriptions are provided in Table 1. 100% duty cycle low-dropout operation Shutdown current: <1 A Temperature range: 40 C to +85 C Skyworks Green products are compliant with all applicable legislation and are halogen-free. SC70JW (8-pin, 2.2 mm 2 mm) package (MSL1, 260 C per For additional information, refer to Skyworks JEDEC-J-STD-020) Denition of Green, document number SQ04-0074. VOUT VIN U1 AAT1110 L1 3 4 VIN LX 4.7 H 1 2 OUT EN C1 C2 5 7 AGND PGND 10 F 4.7 F 8 6 PGND PGND tc87 Figure 1. AAT1110 Typical Application Circuit Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 201971D Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 11, 2013 1 PRELIMINARY DATA SHEET AAT1110 FAST TRANSIENT 800 MA STEP-DOWN CONVERTER 8 1 PGND EN 2 7 OUT PGND 3 6 VIN PGND 45 LX AGND tc88 Figure 2. AAT1110 8-Pin SC70JW-8 (Top View) Table 1. AAT1110 Pin Descriptions Pin Name Description 1 EN Enable pin. Feedback input pin. This pin is connected either directly to the converter output or to an external resistive divider for an 2 OUT adjustable output. 3 VIN Input supply voltage for the converter. 4 LX 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. Typical performance characteristics of the AAT1110 are illustrated Electrical and Mechanical Specifications in Figures 3 through 24. The absolute maximum ratings of the AAT1110 are provided in Table 2, and the electrical specifications are provided in Table 3. Table 2. AAT1110 Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Typical Maximum Units Input voltage to GND VIN 6.0 V LX to GND VLX 0.3 Vin + 0.3 V OUT to GND VOUT 0.3 Vin + 0.3 V EN to GND VEN 0.3 +6.0 V Operating junction temperature TJ 40 +140 C Maximum soldering temperature (at leads, 10 seconds) TLEAD 300 C Maximum power dissipation (SC70JW-8) PD 719 mW Thermal resistance (SC70JW-8) (Note 2) JA 160 C/W Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device. Note 2: Mounted on an FR4 board. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 September 11, 2013 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 201971D