MC34703PNB datasheet(11/46 Pages) FREESCALE

部件名	MC34703PNB

功能描述	10A Switch-Mode Power Supply with LDO Regulator

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制造商	FREESCALE [Freescale Semiconductor, Inc]

网页	http://www.freescale.com

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Analog Integrated Circuit Device Data

Freescale Semiconductor

11

34703

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4. Dynamic Electrical Characteristics

Characteristics noted under conditions -40°C

≤ T

J ≤ 125°C unless otherwise noted. Input voltages VIN1 = VIN2 = 3.3 V using

the typical application circuit (see Figure 27) unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

BUCK CONVERTER (SW, SR)

Duty Cycle Range (Normal Operation) (22)

D

10

–

90

%

Switching Node SW Rise Time (22)

ILOAD = 10 A, SR = OPEN, VIN1 = VIN2 = 3.3 V

tROPEN

–

10

–

ns

Switching Node SW Fall Time (22)

ILOAD = 10 A, SR = OPEN, VIN1 = VIN2 = 3.3 V

tFOPEN

–

10

–

ns

Switching Node SW Rise Time (22)

ILOAD = 10 A, SR = SW, VIN1 = VIN2 = 3.3 V

tRSW

–

14

–

ns

Switching Node SW Fall Time (22)

ILOAD = 10 A, SR = SW, VIN1 = VIN2 = 3.3 V

tFSW

–

14

–

ns

Switching Node SW Rise Time (22)

ILOAD = 10 A, SR = BOOT,VIN1 = VIN2 = 3.3 V

tRBOOT

–

6.0

–

ns

Switching Node SW Fall Time (22)

ILOAD = 10 A, SR = BOOT, VIN1 = VIN2 = 3.3 V

tFBOOT

–

6.0

–

ns

Maximum Deadtime (22)

tD

–

150

–

ns

Buck Control Loop Propagation Delay (22)

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

of Low Level

tPD

–

50

–

ns

Soft Start Duration (Power Sequencing Disabled, EN1 = 1, EN2 = 1) (22)

tSS

800

µs

Fault Condition Timeout (22)

tFAULT

–

10

–

ms

Retry Timer Cycle (22)

tRET

–

100

–

ms

OSCILLATOR (FREQ)

Oscillator Default Frequency (Switching Frequency), FREQ Pin Open

fOSC

250

300

350

kHz

Oscillator Frequency Range

fOSC

200

400

kHz

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

the Internal Suitable Oscillator) (23)

DOSC

–

50

–

%

Synchronization Pulse Minimum Duration (22)

tSYNC

300

–

ns

BOOST REGULATOR (VBST, VBST (sense), VBD)

Boost Regulator FET Maximum ON Time (23)

tON

–

24

–

µs

Boost Regulator Control Loop Propagation Delay (22)

tBSTPD

–

50

–

ns

Boost Switching Node VBD Rise Time

(22)

IBST = 45 mA

tBR

–

35

–

ns

Boost Switching Node VBD Fall Time

(22)

IBST = 45 mA

tBF

–

5.0

–

ns

Notes

22.

Design Information only. Not production tested.

23.

Not production tested for typical values specified.

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