User Manual

element14 is a trademark of Premier Farnell plc 37

can be forced into fixed frequency PWM using the I

C interface. The step-down converters

allow the use of small inductors and capacitors to achieve a small footprint solution

size.

LDO1 and LDO2 are intended to support system standby mode. In normal operation,

they can support up to 100mA each. LDO3 and LDO4 can support up to 285mA each.

By default only LDO1 is always ON but any rail can be configured to remain up in

SLEEP state. In particular the DCDC converters can remain up in a low-power PFM

mode to support processor suspend mode. The

TPS65217C

offers flexible power-up and

power-down sequencing and several house-keeping functions such as power-good output,

pushbutton monitor, hardware reset function and temperature sensor to protect the

battery.

For more information on the

TPS65217C

, refer to http://www.ti.com/product/tps65217C.

Figure 22

is the high level block diagram of the

TPS65217C