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LTC3706

3706fb

APPLICATIONS INFORMATION

LTC3706

78mV MAX

–

3706 F03a

••

LTC3706

78mV MAX

–

3706 F03c

••

Figure 3a. High Side Inductor:

Easier Layout, Low Noise, Accurate

Figure 3c. Switch Current Sensing: Easy Layout,

Accurate, Higher Efﬁciency, High VOUT Capable

Figure 3. Current Sensing Techniques

LTC3706

78mV MAX

–

3706 F03b

••

LTC3706

VCC

1.28V MAX

TRIP

5W TO

50Ω

–

3706 F03d

••

•

Figure 3b. Low Side Inductor:

Accurate, Low Noise, High VOUT Capable

Figure 3d. Current Transformer:

Highest Efﬁciency, High VOUT Capable

inductor current (high side or low side) is generally less

noisy but dissipates more power than sensing the switch

current (Figures 3a and 3b). High side inductor current

sensing provides a more convenient layout than low side

(no split ground plane), but can only be used for output

voltages up to 5.5V, due to the common mode limitations

of the current sense inputs (IS+ and IS–). For most ap-

plications, low side switch current sensing will be a good

solution (Figure 3c).

For high current applications where efﬁciency (power dis-

sipation) is very important, a current sense transformer

may be used. As shown in Figure 3d, the IS– pin should

be tied off to VCC when a current sense transformer is

used. This causes the IS+ pin to become a single ended

(nondifferential) current sense input with a maximum

current sense voltage of 1.28V. Figure 3d shows a typical

application circuit using a current transformer.

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