Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector

Preliminary

Circuit

1

Supply Current, Stand-by Current,

Circuit

2

Output Voltage (VR), Load Stability, Dropout Voltage,

CE Current

CE Current (MODE Current)

Circuit

Circuit

4

Minimum Duty Cycle, Maximum Duty Cycle

U.V.L.O. Voltage, Softstart Time, Latch Time, CE Voltage,

(PFM Duty Cycle), (MODE Voltage)

Circuit

5

Lx ON Resistance

Circuit

6

Current Limit 1 (DC/DC)

Circuit

7

Current Limit 2 (VR), Short Protection (VR)

Circuit

8

Detect Voltage, Release Voltage

Circuit

9

VD Output Current

XC9510 Series

FOSC

300kHz

600kHz

1.2MHz

L

22uH

10uH

4.7uH

Semiconductor Ltd.

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

CIN : 1.0uF (ceramic)

A

A

DCOUT : VIN or GND

V

IROUT

V

CIN : 4.7uF (ceramic)

CE/MODE : VIN

or VIN-1.2V

or GND

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

CL:1.0uF(ceramic,

VROUT>1.5V)

2.2uF(ceramic,

VROUT<1.5V)

CIN : 4.7uF (ceramic)

V

CL : 10uF

(ceramic)

V

L

IDOUT

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

V

CE : VIN

200

Ω

CIN : 1.0uF(ceramic)

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

V

CE : VIN

A

CIN : 1.0uF (ceramic)

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

CE : VIN

CIN : 4.7uF (ceramic)

IDOUT

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

L

CE : VIN

V

V

A

CIN : 4.7uF (ceramic)

CL : 1.0uF (ceramic)

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

CIN:

1uF

V

CE/MODE : VSS

200k

Ω

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

VD_SENSE

(DCOUT or VROUT)

CIN :

　1uF

V

CE : VSS

A

VD_SENSE

(DCOUT or VROUT)

1

2

3

4

8

7

5

6

VDD

CE/

MODE

AGND

LX

DCOUT

VROUT

VDOUT

PGND

Data Sheet

6