MC34708 datasheet(49/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

Table 38. SW1A/B Electrical Specification

Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C  TA  85 C, unless otherwise noted. Typical values

at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted.

Symbol

Characteristic

Min

Typ

Max

Unit

Notes

SW1A/B BUCK REGULATOR

VSW1IN

Operating Input Voltage

• PWM operation, 0 < IL < IMAX

• PFM operation, 0 < IL < ILMAX

3.0

2.8

4.5

VSW1ACC

Output Voltage Accuracy

• PWM mode including ripple, load regulation, and transients

• PFM Mode, including ripple, load regulation, and transients

Nom-25

Nom

Nom+25

(44)

ISW1

Continuous Output Load Current, VINMIN < BP < 4.5 V

• PWM mode single/dual phase (parallel)

• SW1 in PFM mode

2000

ISW1PEAK

Current Limiter Peak Current Detection

•VIN = 3.6 V, Current through Inductor

4.0

ISW1

TRANSIENT

Transient Load Change

• 100 mA/µs

1.0

VSW1OS-

START

Start-up Overshoot, IL = 0

tON-SW1

Turn-on Time

• Enable to 90% of end value IL = 0

500

µs

fSW1

Switching Frequency

• PLLX = 0

• PLLX = 1

2.0

4.0

MHz

ISW1Q

Quiescent Current Consumption

• PWMPS or APS MODE, IL=0 mA

• PFM MODE, IL=0 mA

240

µA

SW1

Efficiency,

•PFM, 0.9 V, 1.0 mA

• PWM Pulse skipping, 1.1 V, 200 mA

• PWM Pulse skipping, 1.1 V, 800 mA

•PWM, 1.1 V, 1600 mA

(45)

Notes:

44.

Transient loading for load steps of ILMAX/2.

45.

Efficiency numbers at VIN = 3.6 V, excludes the quiescent current

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