User`s guide

i.MX53 System Development User’s Guide, Rev. 1
Freescale Semiconductor 5-1
Chapter 5
Setting up Power Management
This chapter discusses how to supply and interface the i.MX53 multimedia applications processor with
two different power management integrated circuits (PMICs): DA9053 from Dialog and LTC3589-1 from
Linear Technology.
The extra components required for the interface are as follows:
• For the DA9053 interface, add an extra regulator RT8010 to supply the 3.3 V USB power domain
• The LTC3589-1 can supply all power rails except DDR. The DDR rail can be supplied by the
LT3481. Both devices are available as automotive grade.
Section 5.6, “Additional Device Information,” provides additional product information about DA9053 and
LTC3589-1. It does not discuss RT8010 and LT3481 due to their simplicity.
5.1 i.MX53 Internal LDOs
The i.MX53 integrates two internal LDOs to supply each of the PLL voltage domains. These LDOs are
supplied from the VDD_REG pin. They deliver 1.3 V for the VDD_DIG_PLL and 1.8 V for the
VDD_ANA_PLL. The 1.3 V regulator outputs its voltage on the VDD_DIG_PLL pin. VDDA, VDDAL1,
and VP can be supplied externally from this pin. Place a ferrite to avoid noise coupling between voltage
domains.
The analog supply LDO can be software configured through the PLL1P8_VREG[4:0] bits for an output
voltage from 1.5 to 2.275 V in 25 mV steps, the default being 1.8 V, and has an output current capability
up to 125 mA. The digital supply LDO can be configured by means of the PLL1P2_VREG[4:0] bits from
0.8 to 1.575 V in 25 mV steps. Its default voltage at power up is 1.2 V and it is able to supply up to
125 mA. This LDO must be programmed to 1.3 V after boot up.
VDD_ANA_PLL can externally supply NVCC_RESET and VDD_DIG_PLL can be connected to
VDDA, VDDAL1, and VP. The latter can also be supplied separately with an external regulator if desired.
eFuses on the i.MX53 control the LDO default state. By default, the following internal LDOs are used.
• LDO_DIS[0]—controls Analog PLL supply.
• LDO_DIS[1]—controls Digital PLL supply.