MC34708 datasheet(61/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

Table 48. SW5 Electrical Specifications

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

SW5 BUCK REGULATOR

VSW5IN

Operating Input Voltage

• PWM operation, 0 < IL < IMAX

• PFM operation, 0 < IL < ILMAX

3.0

2.8

4.5

VSW5ACC

Output Voltage Accuracy

• PWM mode including ripple, load regulation, and transients

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

Nom-3%

Nom

Nom+3%

(53)

ISW5

Continuous Output Load Current, VINMIN < BP < 4.5 V

• PWM mode

• PFM mode

1000

ISW5PEAK

Current Limiter Peak Current Detection

•VIN = 3.6 V Current through Inductor

1.0

ISW5

TRANSIENT

Transient Load Change

• 100 mA/µs

500

VSW5

OS-START

Start-up Overshoot, IL = 0

tON-SW5

Turn-on Time

• Enable to 90% of end value IL = 0

500

µs

fSW5

Switching Frequency

• PLLX = 0

• PLLX = 1

2.0

4.0

MHz

ISW5Q

Quiescent Current Consumption

• PWMPS or APS MODE, IL = 0 mA; device not switching

• PFM MODE, IL = 0 mA; device not switching

160

µA

SW5

Efficiency

•PFM, 1.8 V, 1.0 mA

• PWM Pulse skipping, 1.8 V, 50 mA

• PWM Pulse skipping, 1.8 V, 500 mA

•PWM, 1.8 V, 1000 mA

(54)

Notes

53.

Transient Loading for load Steps of ILMAX/2

54.

Efficiency numbers at VIN = 3.6 V, Excludes the quiescent current.

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