4

+5V BIAS SUPPLY APPLICATION SCHEMATIC

In this application example, the SP7650ER is power by an external +5V bias supply

which current consumption of 20mA Maximum. If this supply is not available than it is

recommend Sipex SPX5205 Low-Noise LDO Voltage Regulator.

RBST

20

CBST

6,800pF

R3

200k,1%

L1

6.8uH

C1

22uF

CVCC

2.2uF

+5V

U1

SP7650

PGND

1

PGND

2

PGND

3

GND

4

VFB

5

COMP

6

UVIN

7

GND

8

SS

9

VIN

10

VIN

11

VIN

12

VIN

13

LX

14

LX

15

LX

16

NC

17

BST

18

GND

19

GND

20

GND

21

VCC

22

LX

23

LX

24

LX

25

LX

26

DBST

CSS

47nF

CP1

22pF

3.30V

0-3A

R2

21.5k,1%

GND

C3

22uF

C3

CERAMIC

1210

X5R

12V

6.3V

VIN

SD101AWS

GND2

VOUT

RZ3

7.15k,1%

R4

100k,1%

C2

0.1uF

C1

CERAMIC

1210

X5R

16V

CZ3

150pF

CZ2

1,000pF

R1

68.1k,1%

RZ2

15k,1%

CF1

100pF

fs=300Khz

Notes:

All resistor & capacitor size

0603 unless other wise specify

U1 Bottom-Side Layout should has

three Contacts which are

isolated from one of another, QT

& QB Drain Contact and

Controller GND Contact

Figure 9. Output Ripple: No Load

Figure 10. Output Ripple: 3A Load

Table 1: SP7650EB Suggested Components and Vendor Lists

Vout ripple = 32mV

Vin

Ichoke(2A/div)

Vout ripple = 40mV

Vin

Ichoke (2A/div)