MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33997

15

APPLICATIONS

Figure 8. 33997 Application Circuit Schematic Diagram

Table 1. Recommended Components

Designator

Value/Rating

Description/Part No.

Manufacturer (Note 16)

Cf1

10 µF/50 V

Aluminum Electrolytic/UUB1H100MNR

Nichicon

Cf2, C2

1.0 µF/50 V

Ceramic X7R/C1812C105K5RACTR

Kemet

C1

100 µF/50 V

Aluminum Electrolytic/UUH1V101MNR

Nichicon

C3 (Note 15)

68 µF/10 V

Tantalum/T494D686M010AS

Kemet

C6

68 µF/10 V

Tantalum/T494D686M010AS

Kemet

C7

4.7 µF/10 V

Tantalum/T494A475M010AS

Kemet

C4, C5

100 nF/16 V

Ceramic X7R

Any Manufacturer

C8 (Optional)

390 pF/50 V

Ceramic X7R

Any Manufacturer

C9

22 nF/25 V

Ceramic X7R

Any Manufacturer

Notes

15.

It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 µF/6.3 V X7R ceramic. In this case the compensation resistor

has to be changed to Rc1 = 200

Ω to stabilize the switching regulator operation.

16.

Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or

tables. While Motorola offers component recommendations in this configuration, it is the customer’s responsibility to validate their application.

SNSEN

VPW R

KA _V PWR

GND

3399 7

EN

VS W

VDDH

DRVL

FB L

PW ROK

VKAM

VKAMOK

Vbg

VREF1

VREF2

I-lim

Ramp

Osc

Soft

St art

Logic

&

Latch

PwrO K

VkamO K

POR

3. 3V

Linear

Regulat or

Driver

3.3V

Standby

Reg.

Ba ndgap

Voltage

Referen ce

Ch arge

Pump

VREF1

Re g.

VREF2

Re g.

Vbg

V bg

CRES

VSUM

FBKB

Enable

Control

En b

Snsenb

Snse nb

Sn senb

Enb

Enb

Enb

Retry

Retry

Drive

C9

22nF

Cs1

33 nF

Lf1

10uH

C2

1.0uF

100uF

C1

Cf 2

1.0uF

10 uF

Cf1

Cs2

33nF

C6

68uF

100n F

C5

C4

100nF

68uF

C3

L1

15uH

C7

4.7 uF

R1

10k

R2

10k

Q1

Rc1

3.6k

Cc1

2. 2nF

D1

Dp1

Dp2

9

11

12

15

13

14

24

1

10

5-8

17-20

22

23

3

16

21

2

4

VDDL =3.3V

@40 0mA

VKAM =3.3V

@10mA

VDDH =5.0V

@ 1400mA total

C8

390 pF

R3

2.2 R

Opt io nal

Snubber

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com