34701 datasheet(12/38 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34701

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4.

DYNAMIC ELECTRICAL CHARACTERISTICS

Characteristics noted under conditions -40°C ≤ TA ≤ 85°C unless otherwise noted. Input voltages VIN1 = VIN2 = 3.3 V using

the typical application circuit (see Figures 33) unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

BUCK CONVERTER

Duty Cycle Range (Normal Operation) (18)

0–

Switching Node SW Rise Time (18)

VIN = 5.0 V, ILOAD = 1.0 A

tRISE

–7.0

–

Switching Node SW Fall Time (18)

VIN = 5.0 V, ILOAD = 1.0 A

tFALL

–17–

Maximum Deadtime (18)

–35–

Buck Control Loop Propagation Delay (18)

VINV < 0.8 V to VSW > 90% of High Level or VINV > 0.8 V to VSW < 10%

of Low Level

tPD

–50–

Soft Start Duration (Power Sequencing Disabled, EN1 = 1, EN2 = 1) (18)

tSS

200

350

800

µs

Fault Condition Time-Out (18)

tFAULT

7.0

Retry Timer Cycle (18)

tRET

100

150

OSCILLATOR

Oscillator Center Frequency(20)

RF = 11.3 k

Ω

fOSC

270

300

330

kHz

Oscillator Frequency Range

fOSC

200

–

400

kHz

Oscillator Frequency Adjusting Resistor Range

RFREQ

7.0

–

Ω

Oscillator Frequency Adjustment (19), (20)

RF = 7.0 k

Ω

fOSC

400

–

kHz

Oscillator Frequency Adjustment (19), (20)

RF = 22 k

Ω

fOSC

–

200

kHz

Oscillator Default Frequency (Switching Frequency), FREQ Pin Open

fOSC

–

300

–

kHz

Oscillator Output Signal Duty Cycle (Square Wave, 180° Out-of-Phase with

the Internal Suitable Oscillator)

DOSC

Synchronization Pulse Minimum Duration (18)

tSYNC

1.0

–

µs

Notes

18.

Design information only. This parameter is not production tested.

19.

see Figure 4 for more details

20.

RF is RFREQ

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