LTC1876 datasheet(31/36 Pages) LINER

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LTC1876

1876fa

signal ground pin and the ground return of CINTVCC must

return to the combined COUT (–) plates. Within the regula-

tor circuitry, are the signal and power grounds kept

separate? The regulator signal ground pin must return to

the CAUXIN (–) plates.

3. Does the path formed by the top N-Channel MOSFET

Schottky diode (D1, D2) and the CIN capacitor have short

leads and PC trace lengths? The output capacitor (–)

plates should be connected as close as possible to the

(–) plates of the input capacitor by placing the capacitors

next to each other and away from the Schottky loop

described above. Also, the path formed by the AUXSW

pins, Schottky diode (D3) and the COUT3 capacitor should

have short leads and PC trace lengths. The CAUXIN capaci-

tor (–) plates should be connected as close as possible to

Figure 16. Branch Current Waveforms

the (–) plates of the COUT3 (–) plates by placing the

capacitors next to each other and away from the D3 loop

described above.

4. If the input supply to the boost regulator is obtain from

one of the other outputs, is this connection short (< 1cm)?

5. Do the LTC1876 VOSENSE and AUXVFB pins resistive

dividers connect to the (+) plates of its respective COUT?

The resistive divider must be connected between the (+)

plate of COUT and signal ground and a small VOSENSE

decoupling capacitor should be as close as possible to the

LTC1876 SGND pin. A feedforward capacitor across R8

can be connected to enhance the transient response of the

boost regulator. The R2, R4 and R8 connections should

not be along the high current input feeds from the input

capacitor(s).

APPLICATIO S I FOR ATIO

RL1

SW1

RSENSE1

VOUT1

COUT1

VIN

CIN

RIN

RL2

BOLD LINES INDICATE

HIGH, SWITCHING

CURRENT LINES.

KEEP LINES TO A

MINIMUM LENGTH.

SW2

1876 F16

RSENSE2

VOUT2

COUT2

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