DATA SHEET AAT1153: 2 A Step-Down Converter Applications Description The AAT1153 SwitchReg is a 1.2 MHz constant frequency Cellular phones current mode PWM step-down converter. It is ideal for portable Digital cameras equipment requiring very high current up to 2 A from single-cell DSP core supplies Lithium-Ion batteries while still achieving over 90% efficiency during peak load conditions. The AAT1153 also can run at 100% PDAs duty cycle for low dropout operation, extending battery life in Portable instruments portable systems while light load operation provides very low Smart phones output ripple for noise-sensitive applications. The AAT1153 can supply up to 2 A output load current from a 2.5 V to 5.5 V input voltage and the output voltage can be Features regulated as low as 0.6 V. The high switching frequency Input voltage range: 2.5 V to 5.5 V minimizes the size of external components while keeping Output voltages: 0.6 V to VIN switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to Output current: 2 A optimize size and provide efficient operation. High efficiency: up to 95% The AAT1153 is available with adjustable (0.6 V to VIN) output 1.2 MHz constant switching frequency voltage. The device is available in a Pb-free, 10-pin, 3 3 mm Low RDS(ON) internal switches: 0.15 TDFN package and is rated over the 40 C to +85 C temperature range. Allows use of ceramic capacitors A typical application circuit is shown in Figure 1. The pin Current mode operation for excellent line and load transient configuration and package are shown in Figure 2. Signal pin response assignments and functional pin descriptions are provided in Short-circuit and thermal fault protection Table 1. Soft start Low dropout operation: 100% duty cycle Low shutdown current: ISHDN < 1 A TM Skyworks Green products are compliant with 40 C to +85 C temperature range all applicable legislation and are halogen-free. For additional information, refer to Skyworks TDFN (10-pin, 3 3 mm) package TM Denition of Green , document number (MSL1, 260 C per JEDEC J-STD-020) SQ040074. VIN L1 VOUT 22 H 2.5 to 5.5 V 1.8 V, 2 A 8 1 EN LX 7 2 R1 IN LX 634 k 5 3 C2 C1 AIN FB AAT1153 22 F 22 F 10 6 R2 AGND PGND 316 k 9 4 AGND PGND 201992-001 Figure 1. AAT1153 Typical Application Circuit Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 201992D Skyworks Proprietary and Confidential Information Products and Product Information are Subject to Change Without Notice September 2, 2016 1 DATA SHEET AAT1153: 2 A STEP-DOWN CONVERTER 1 10 PGND EN 2 9 PGND IN 3 8 LX AIN 4 LX 7 AGND 5 AGND 6 FB/OUT 201992-002 Figure 2. AAT1153 Pinout (Top View) Table 1. AAT1153 Signal Descriptions Pin Name Description 1 EN Enable pin. Active high. In shutdown, all functions are disabled drawing < 1 A supply current. Do not leave EN floating. 2 IN Power supply input pin. Must be closely decoupled to AGND with a 2.2 F or greater ceramic capacitor. 3 AIN Analog supply input pin. Provides bias for internal circuitry. 4, 6 AGND Analog ground pin. 5 FB/OUT Feedback input. Connect FB to the center point of the external resistor divider. The feedback threshold voltage is 0.6 V. 7, 8 LX Switching node pin. Connect the output inductor to this pin. 9, 10 PGND Power ground pin. EP Power ground exposed pad. Must be connected to bare copper ground plane. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 September 2, 2016 Skyworks Proprietary and Confidential Information Products and Product Information are Subject to Change Without Notice 201992D