SS6612 datasheet(13/16 Pages) SSC

13 / 16 page

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Rev.2.02 12/06/2003

SS6612

3. PCB Layout and Grounding

Since the SS6612’s switching frequency can

range up to 500kHz, the SS6612 can be very

sensitive. Careful printed circuit layout is im-

portant for minimizing ground bounce and noise.

The OUT pin should be as clear as possible,

and the GND pin should be placed close to the

ground plane. Keep the IC’s GND pin and the

ground leads of the input and output filter capaci-

tors less than 0.2in (5mm) apart. In addition,

keep all connections to the FB and LX pins as

short as possible. In particular, when using ex-

ternal feedback resistors, locate them as close

to the FB as possible. To maximize output power

and efficiency, and minimize output ripple voltage,

use a ground plane and solder the IC’s GND di-

rectly to the ground plane. Fig.37 to 39 are the

recommended layout diagrams.

Ripple Voltage Reduction

Two or three parallel output capacitors can sig-

nificantly improve the output ripple voltage of the

SS6612. The addition of an extra input capaci-

tor results in a stable output voltage. Fig.40

shows the application circuit with the above fea-

tures. Fig. 41 to 48 show the performance of

Fig.40.

APPLICATION EXAMPLES

DAMPING

SWITCH

VIN

VOUT

SS6612

OUT

BATT

GND

200

Ω

µH

VOUT

VIN

100K

Ω

SS6612

µH

µF

0.1

µF

0.1

µF

200

Ω

LOW BATTERY

OUTPUT

CLSEL

OUT

GND

REF

LBI

BATT

LBO

SHDN

L: TDK SLF7045T-22OMR90

C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER

Fig.33 Simplified Damping Switch Diagram

Fig.34 VOUT = 3.3V Application Circuit.

VOUT

VIN

100K

Ω

SS6612

µH

µF

0.1

µF

0.1

µF

200

Ω

LOW BATTERY

OUTPUT

CLSEL

OUT

GND

REF

LBI

BATT

LBO

SHDN

L: TDK SLF7045T-22OMR90

C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER

VOUT

VIN

100KΩ

200

Ω

22µH

µF

0.1

µF

0.1

µF

LOW BATTERY

OUTPUT

SS6612

SHDN

CLSEL

LBO

GND

REF

LBI

BATT

OUT

L: TDK SLF7045T-22OMR90

C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER

VOUT=VREF*(1+R5/R6)

Fig.35 VOUT = 5.0V Application Circuit.

Fig.36 An Adjustable Output Application Circuit

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