MC34703 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MC34703

10A+ Switch-Mode Power Supply with LDO Regulator

Freescale Semiconductor 

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4. Dynamic Electrical Characteristics

Characteristics noted under conditions -40°C ≤ TJ ≤ 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

ns

–

10

–

Switching Node SW Fall Time (22)

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

tFOPEN

ns

–

10

–

Switching Node SW Rise Time (22)

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

tRSW

ns

–

14

–

Switching Node SW Fall Time (22)

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

tFSW

ns

–

14

–

Switching Node SW Rise Time (22)

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

tRBOOT

ns

–

6.0

–

Switching Node SW Fall Time (22)

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

tFBOOT

ns

–

6.0

–

Maximum Deadtime (22)

tD

–

150

–

ns

Buck Control Loop Propagation Delay (22)

tPD

ns

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

of Low Level

–

50

–

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

DOSC

%

the Internal Suitable Oscillator) (23)

–

50

–

Synchronization Pulse Minimum Duration (22)

tSYNC

300

–

–

ns

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

Boost Regulator FET Maximum ON Time (23)

Boost Regulator Control Loop Propagation Delay (22)

Boost Switching Node VBD Rise Time (22)

IBST = 45 mA

Boost Switching Node VBD Fall Time (22)

IBST = 45 mA

tON

–

24

–

µs

tBSTPD

–

50

–

ns

tBR

ns

–

35

–

tBF

ns

–

5.0

–

Notes

22. Design Information only. Not production tested.

23. Not production tested for typical values specified.

Analog Integrated Circuit Device Data

Freescale Semiconductor

34703

11

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