IMX28CEC datasheet(15/70 Pages) FREESCALE

15 / 70 page

i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

Table 13 illustrates the power supply characteristics.

Table 13. Power Supply Characteristics

Parameter

Min

Typ

Max

Units

Linear Regulators

Output Voltage Accuracy (VDDIO, VDDA, VDDM, VDDD)

1 No load.

–3

—

VDDIO Maximum Output Current (VDDIO = 3.30 V, VDD5V =4.75V)

2, 3

2 Maximum output current measured when output voltage droops 100 mV from the programmed target voltage with no load

present.

3 Because the internal linear regulators are cascaded, it is not possible to simultaneously operate the V

DDIO, VDDA, VDDM, and

VDDD linear regulators at the maximum specified load current. For example, the VDDIO linear regulator provides current to both

the VDDIO 3.3 V supply rail as well as the VDDM and VDDA linear regulator inputs. Likewise, the VDDA linear regulator provides

current to both the 1.8 V supply rail as well as the VDDD linear regulator input. The application designer should ensure the

following two conditions are met:

(VDDIO Load Current + VDDM Load Current + VDDA Load Current) < VDDIO Maximum Output Current

(VDDA Load Current + VDDD Load Current) < VDDA Maximum Output Current

270

—

VDDIO Maximum Output Current (VDDIO = 3.30 V, VDD5V = 4.40 V)

2, 3

200

—

VDDM Maximum Output Current (VDDM = 1.5 V)

160

—

VDDA Maximum Output Current (VDDA =1.8 V)

2, 3

225

—

VDDD Maximum Output Current (VDDD =1.2 V)

2, 3

200

—

DCDC Converters

Output Voltage Accuracy (DCDC_VDDIO, DCDC_VDDA,

DCDC_VDDD)1

–3

—

DCDC_VDDD Maximum Output Current (VDDD = 1.55 V)

4, 5

4 DCDC Double FETs Enabled, Inductor Value = 15

μH.

5 The DCDC Converter is a triple output buck converter. The maximum output current capability of each output of the converter

is dependent on the loads on the other two outputs. For a given output, it may be possible to achieve a maximum output current

higher than that specified by ensuring the load on the other outputs is well below the maximum.

250

—

DCDC_VDDA Maximum Output Current (VDDA =1.8 V)

4, 5

200

—

DCDC_VDDIO Maximum Output Current (VDDIO = 3.15 V, 3.3 V < BATT

< 4.242 V)4, 5, 6

6 Assumes simultaneous load of IDDD = 250 mA@ 1.55 V and IDDA = 200 mA@1.8 V.

250

—

VDD4P2 Regulated Output

VDD4P2 Output Voltage Accuracy (TARGET=4.2V)1

–3

—

VDD4P2 Output Current Limit Accuracy (VDD5V = 4.75 V,

ILIMIT=480 mA)7

TBD

480

TBD

VDD4P2 Output Current Limit Accuracy (VDD5V=4.75 V,

ILIMIT=100 mA)7

TBD

100

TBD

Battery Charger

Final Charge Voltage Accuracy (TARGET=4.2 V)

-2

—

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