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AAT2687 Datasheet(PDF) 9 Page - Skyworks Solutions Inc. |
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AAT2687 Datasheet(HTML) 9 Page - Skyworks Solutions Inc. |
9 / 20 page 9 AAT2687 PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202033A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012 Functional Description The AAT2687 provides two independently regulated DC outputs, consisting of a high voltage step-down regulator and a low input voltage linear low dropout (LDO) regula- tor. The PMIC is optimized for low cost 12V adapter inputs, making the device an ideal system-on-a-chip power solu- tion for consumer communications equipment. Channel 1 is a step-down regulator with an input voltage range 6.0 to 24V, providing up to 4.5A output current. The 490kHz fixed switching frequency allows small L/C filtering components. Channel 1 utilizes voltage mode control configured for optimum performance across the entire output voltage and load range. The controller includes integrated over- current, soft-start and over-temperature protection. Over- current is sensed through the output inductor DC winding resistance (DCR). An external resistor network adjusts the current limit according to the DCR of the desired inductor and the desired output current limit. Frequency reduction limits over-current stresses during short-circuit events. The operating frequency returns to the nominal setting when over-current conditions are removed. Channel 2 is a linear low-dropout (LDO) regulator provid- ing up to 600mA output current at a factory set output voltage. The device provides extremely low output noise, low quiescent current and excellent transient response. The controller includes integrated over-current, soft- start and over-temperature protection. Independent input and enable pins provide maximum design flexibil- ity. The AAT2687 is available in the Pb-free, 4x5mm 24-pin TQFN package. The rated operating temperature range is -40C to 85C. Functional Block Diagram IN2 OUT2 EN2 Logic Error Amp Control Logic OCP Voltage Ref 2 OT GND Logic Error Amp Control Logic EN1 BST1 OT Voltage Ref VL1 VINT Comp. IN1 Reg. LX1 RS1 OS1 Logic Error Amp Control Logic FB1 OSC OT Voltage Ref 1 Comp. Reg. 20Ω Comp FB_LDO FB_LDO COMP1 VOCP1 = 0.1V |
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Similar Description - AAT2687_12 |
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