MMPF0100 datasheet(58/136 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

SW2 External Components

SW2 Specifications

Table 61. SW2 External Component Recommendations

Components

Description

Values

CINSW2(36)

SW2 Input capacitor

4.7

μF

CIN2HF(36)

SW2 Decoupling input capacitor

0.1

μF

COSW2(36)

SW2 Output capacitor

2 x 22

μF

LSW2

SW2 Inductor

1.0

μH

DCR = 50 m

ISAT = 2.65 A

Notes

36.

Use X5R or X7R capacitors.

Table 62. SW2 Electrical Characteristics

All parameters are specified at TA = -40 to 85 °C, VIN = VINSW2 = 3.6 V, VSW2 = 3.15 V, ISW2 = 100 mA,

SW2_PWRSTG[2:0] = [111], typical external component values, fSW2 = 2.0 MHz, unless otherwise noted. Typical values are

characterized at VIN = VINSW2 = 3.6 V, VSW2 = 3.15 V, ISW2 = 100 mA, SW2_PWRSTG[2:0] = [111], and 25 °C, unless otherwise

noted.

Parameter

Symbol

Min

Typ

Max

Unit

SWITCH MODE SUPPLY SW2

Operating Input Voltage(37)

VINSW2

2.8

–

4.5

Nominal Output Voltage

VSW2

–

Table 54

–V

Output Voltage Accuracy

• PWM, APS, 2.8 V < VIN < 4.5 V, 0 < ISW2 < 2.0 A

0.4 V < VSW2 < 0.85 V

0.875 V < VSW2 < 1.975 V

2.0 V < VSW2 < 3.3 V

• PFM, 2.8 V < VIN < 4.5 V, 0 < ISW2 ≤ 50 mA

0.4 V < VSW2 < 0.85 V

0.875 V < VSW2 < 1.975 V

2.0 V < VSW2 < 3.3 V

VSW2ACC

-25

-3.0%

-6.0%

-65

-6.0%

–

3.0%

6.0%

Rated Output Load Current (38)

2.8 V < VIN < 4.5 V, 0.4 V < VSW2 < 3.3 V

ISW2

–

2000

Current Limiter Peak Current Detection

• Current through Inductor

SW2ILIM = 0

SW2ILIM = 1

ISW2LIM

2.8

2.1

4.0

3.0

5.2

3.9

Start-up Overshoot

ISW2 = 0.0 mA

DVS clk = 25 mV/4

μs, VIN = VINSW2 = 4.5 V

VSW2OSH

––

Turn-on Time

Enable to 90% of end value

ISW2 = 0.0 mA

DVS clk = 50 mV/8

μs, VIN = VINSW2 = 4.5 V

tONSW2

–

550

µs

Switching Frequency

SW2FREQ[1:0] = 00

SW2FREQ[1:0] = 01

SW2FREQ[1:0] = 10

fSW2

–

1.0

2.0

4.0

–

MHz

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