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SS6612COTR

High-Efficiency Synchronous Step-up DC/DC Converter with Selectable Current Limit

Silicon Standard Corp. 

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

VOUT

OUT DAMPING

Q1

SWITCH

Q3

R1

BATT 200Ω

VIN

LX

L1

Q2

22µH

SS6612

GND

Fig.33 Simplified Damping Switch Diagram

VIN

R1

200Ω

BATT

R3

LBI

LX

OUT

CLSEL

L

22µH

C1

47µF

C2

0.1µF

VOUT

C3

47µF

R4

REF

0.1µF

C4

GND

SHDN

LBO

FB

SS6612

R2

100KΩ

LOW BATTERY

OUTPUT

L: TDK SLF7045T-22OMR90

C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER

Fig.35 VOUT = 5.0V Application Circuit.

VIN

R1

200Ω

BATT

L

C1

22µH 47µF

LX

R3

LBI

OUT

CLSEL

C2

0.1µF

VOUT

C3

47µF

R4

REF

0.1µF

C4

GND

SHDN

LBO

FB

R2

100KΩ

LOW BATTERY

OUTPUT

SS6612

L: TDK SLF7045T-22OMR90

C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER

Fig.34 VOUT = 3.3V Application Circuit.

R1

200Ω

R3

R4

0.1µF

C4

BATT

LX

OUT

LBI

REF

CLSEL

SHDN

LBO

GND

FB

SS6612

L

22µH

VIN

C1

47µF

C2

0.1µF

100KΩ R5

R2

VOUT

C3

47µF

LOW BATTERY

OUTPUT

R6

L: TDK SLF7045T-22OMR90

C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER

VOUT=VREF*(1+R5/R6)

Fig.36 An Adjustable Output Application Circuit

Rev.2.02 12/06/2003

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