SC2447 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC2447

Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

Semtech Corporation 

SC2447

POWER MANAGEMENT

Timing Chart

4.5V

AVCC

1.5V

1.25V

0

0.5V (VREF)

0

0

GDH in high impedance state

0

t0

t1

t2 t4

3.2V

VSS/EN

Enable Hiccup

VCOMP

t5 t6 t7

0

VREFSS

VIN-

0

GDH

0

GDL

0

4.5V

AVCC

1.25V

3.2V

1.5V

VSS/EN

Enable Hiccup

VCOMP

0.5V (VREF)

GDH in high impedance state

t0

t1

t2

t3 t4

t5 t6 t7

VREFSS

VIN-

GDH

GDL

(a) Normal Start Up

(b) Pre-Biased Start Up

Figure 5. SC2447 Start-up Timing Diagram

AVCC

VSS/EN

VCOMP

4.3V

VREFSS

VIN-

0.5V (VREF)

GDH

GDL

© 2006 Semtech Corp.

GDH in high impedance state

t16

t17

Figure 6. SC2447 UVLO Shutdown Timing Diagram

13

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