34921 datasheet(9/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34921

STATIC ELECTRICAL CHARACTERISTICS

5.0 V Switching Regulator

Vreg Threshold

V5.0

4.8

5.0

5.2

Cycle-by-Cycle Current Limit Threshold

V5.0 = 2.0 V to Max

V5.0 ≤ 1.0 V

ILIMIT

0.75

–

1.2

1.0

2.25

–

V5.0 to Turn On/Off V3.3 Regulator

(8)

V5_3.3t

–2.2

–

Hysteresis for V5_3.3t

(8)

V5_3.3t_hys

–

175

–

3.3 V Switching Regulator

Vreg Threshold

V3.3

3.15

3.28

3.45

Cycle-by-Cycle Current Limit Threshold

V3.3 = 2.0 V to Max

V3.3 ≤ 1.0 V

ILIMIT

2.75

–

3.6

3.5

5.5

–

VCORE 3.3V Linear Regulator

Voltage Tolerance

ICORE = 0.02 A to 0.3 A, VNOM =2.5 V

ICORE = 0.02 A to 0.3 A, VNOM =1.8 V

ICORE 0 0.02 A to 0.3 A, VNOM =1.5 V

VCORE_TOL

2.35

1.675

1.4

2.49

1.78

1.49

2.66

1.925

1.6

Load Regulation

ILOAD =20mA to 300mA

VILOAD

–

±10

±100

Current Limit Threshold

ILIMIT

400

750

1200

Motor Drivers in DC Mode

Motor Driver A High- or Low-Side Switch Voltage Drop

IPWM = 1.7 A, GND or B+ to Output

VDROP(A)

–.65

1.5

Motor Driver A Output Current Limit

ILIMIT(A)

3.6

4.9

7.2

Motor Driver B High- or Low-Side Switch Voltage Drop

IPWM = 2.0 A, GND or B+ to Output

VDROP(B)

–.70

1.4

Motor Driver B Output Current Limit

ILIMIT(B)

2.8

4.9

7.2

Motor Driver C High- or Low-Side Switch Voltage Drop

IPWM = 0.375 A, GND or B+ to Output

VDROP(C)

–.75

1.5

Motor Driver C Current Limit—Top Side

ILIMIT1(C)

0.75

1.2

1.5

Motor Driver C Current Limit—Bottom Side

ILIMIT2(C)

1.0

1.65

2.0

Notes

See Figure 10, Power-Up Sequencing, page 22.

Table 3. Static Electrical Characteristics (continued)

Characteristics noted under conditions 16 V ≤ B+ ≤ 34 V, 0

°C ≤ TA ≤ 70°C, and 0°C ≤ TJ ≤ 100°C unless otherwise noted.

Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

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