Output Current (bottom) (A) DATA SHEET AAT2114A 2.5A Low-Noise, Fast Transient 3MHz Step-Down Regulator General Description Features The AAT2114A SwitchReg step-down converter deliv- 2.5A Maximum Output Current ers up to 2.5A to support the adjustable 1.0V to V 3MHz Switching Frequency IN output from the 2.7V to 5.5V input source. The 3MHz Stable With 20F Output Capacitor switching frequency allows a high-bandwidth design that 2.7V to 5.5V Input Voltage Range minimizes the external LC component requirements. Adjustable 1.0V to V Output Voltage IN Up to 95% Efficiency The AAT2114A high-frequency converter consumes only Excellent Current-Mode Transient Response 70A no-load quiescent current. The internally compen- Low-Noise Light-Load Architecture sated, high-frequency, current-mode control scheme pro- 70A No Load Quiescent Current vides excellent transient response, minimal output ripple, No External Compensation Required and reduced spectral noise. Additionally, the AAT2114A Internal Soft Start provides tight output accuracy across the entire load and Over-Temperature and Current-Limit Protection input voltage operating ranges. <1A Shutdown Current The regulator maintains high efficiency by integrating -40C to +85C Temperature Range the high-side and low-side MOSFETs and designing the 16-Pin, 3mm x 3mm QFN Package gate drivers to minimize dead-time switching losses. The regulator also reduces the switching frequency under Applications light load conditions, minimizing power loss over the entire load range. Cellular Phones Digital Cameras For system fault protection, the AAT2114A includes over- MP3/Portable Media Players temperature and short-circuit current-limit protection to Wireless Cards safeguard the AAT2114A and system components from overload conditions. The compact 3mm x 3mm QFN package footprint, mini- mal LC requirements, and high efficiency make the AAT2114A an ideal choice for low-power portable applica- tions operating from a Li-ion/polymer battery. Typical Application V Load Transient Response OUT L1 0.47H (250mA to 2.5A V = 3.6V V = 1.2V V IN OUT IN 1.2V, 2.5A 13,14,15 C = 2x10F C = 100pF) OUT FF 9 2.7V-5.5V LX VCC 1.4 C 10,11,12 16 OUT VP N/C 1.3 R 2x10F FBH 190mV C IN 1.2 59k 6V AAT2114A 10F 1.1 1, 2, 3 0603 4 6V FB C 3 PGND FF 0603 100pF 2 R 6 FBL 1 N/C 59k ON 0 7 5 EN SGND 8 EP OFF N/C GND Time (50s/div) Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 202004C Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. March 18, 2013 Output Voltage (top) (V)N/C EN N/C SGND 13 8 LX 14 7 LX 15 6 LX 16 5 N/C DATA SHEET AAT2114A 2.5A Low-Noise, Fast Transient 3MHz Step-Down Regulator Pin Descriptions Pin Name Function Power Ground. PGND is internally connected to the source of the low-side N-channel MOSFET. Connect to 1, 2, 3 PGND the input capacitor and output capacitor return. Feedback Input. FB senses the output voltage for regulation control. Connect a resistive divider net- 4FB work from the output to FB to SGND to set the output voltage accordingly. The adjustable FB regulation threshold is 0.6V. Signal/Analog Ground. SGND is internally connected to the analog ground of the control circuitry. Con- 5 SGND nect the return of the feedback components to this ground. Not Internally Connected. This pin is not internally connected and may be either left open or shorted to 6, 8, 16 N/C an adjacent pin. Enable Input. A logic high enables the AAT2114A regulator. A logic low forces the AAT2114A into shut- 7EN down mode, placing the output into a high-impedance state and reducing the quiescent current to less than 1A. Do NOT leave EN oating. 9 VCC Bias Input Supply. VCC supplies power to the analog and logic signal control circuitry of the AAT2114A. Input Power Supply. Connect VP to the input power source. Bypass VP to PGND with a 10F or greater 10, 11, 12 VP ceramic capacitor. VP internally connects to the source of the high-side P-channel MOSFET and MOSFET drivers as shown in the Functional Block Diagram. Inductor Switching Node. LX is internally connected to the source of the high-side P-Channel MOSFET 13, 14, 15 LX and the drain of the low-side N-channel MOSFET. Externally connected to the power inductor as shown in the Typical Application Circuit. Thermal/Substrate Ground. GND is internally connected to the substrate of the controller and serves as EP GND the lowest thermal impedance path. Connect directly to the system ground plane to keep the thermal impedance low. Pin Configuration QFN33-16 (Top View) 1 12 PGND VP 2 11 VP PGND EP 3 10 VP PGND 4 9 FB VCC Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 202004C Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. March 18, 2013