2011/12 Power Management E T Sean Hung 99 (wh/kg) (NiCd) (Ni-MH) DC/DC (Ni-MH) DC/DC DC/DC DC/DC (Switch Frequency) RDS(ON) DC/DC Power Management 2011/12 E T 1 100 2 DC/DC 1 (Buck Convector) DC/DC (Boost Convector) DC/DC AIC2341 (Buck-Boost Convector) 2 3.3V 0V (Buck Circuit) (Boost Circuit) 2.5MHZ (Switch Frequency) 1A (Output Current) (1) (2) 2011/12 Power Management (5) (Switch Frequency, fsw) 2.5MHz (6) (Duty Cycle, D) (Inductor Current Ripple, IL) E T (1) 3 1 (2) 101 PCB Layout (Saturation Current) (3) IC (4) (EMI) (Maximum Peak Current of (Power GND) Inductor) (GND) IC (3) (MODE) (4) (Jumper-SW2) (5) (Output Ripple, (5) (Pulse Skip Modulation, PSM) (6) (Pulse Width VOUT) Modulation, PWM) (6) (Jumper-SW1) (Enable) (Switch Frequency, fsw) (Duty Cycle, D) PCB Layout 2.5MHz (Inductor, L) (Output capacitance, COUT) X5R X7R (ESR) 3 PCB Layout Power Management 3 1 2011/12 (BOM) E T 102 5 (Buck-Boost) 4 (Buck) (VIN=3.3V,VOUT=3.3V/100mA) (VIN=4.2V,VOUT=3.3V/100mA) 4.2V 4 IC 4.2V SW1 6 (Boost) 3.3V (VIN=2.5V,VOUT=3.3V/100mA) SW2 DC 3.3V SW1 SW1 DC SW2 90.2% 20mV 89.6% 3.3V 5 50mV (MODE) IC 3.3V SW1 (Jumper-SW2) GND (Pulse Skip Modulation, PSM) SW2 92.3% 7 50mV 2.5V 6 IC 2.5V SW2 2011/12 7 (Power Save Mode, PSM) Power Management E T (VIN=3.3V,VOUT=3.3V/10mA) 8 AIC234 103 AIC2341 3.3V BUCK 7 BOOST 8 BUCK-BOOST 8 D(t) D(t) DC/DC Vg ? L L R C R D(t) R D(t) R