LTC3624 datasheet(13/20 Pages) LINER

13 / 20 page

LTC3624/LTC3624-2

36242fc

For more information www.linear.com/LTC3624

applicaTions inForMaTion

Checking Transient Response

Theregularloopresponsecanbecheckedbylookingatthe

load transient response. Switching regulators take several

cyclestorespondtoastepinloadcurrent.Whenaloadstep

occurs, VOUTimmediatelyshiftsbyanamountequaltothe

∆ILOAD • ESR, where ESR is the effective series resistance

of COUT. ∆ILOAD also begins to charge or discharge COUT

generating a feedback error signal used by the regulator to

return VOUT to its steady-state value. During this recovery

time, VOUT can be monitored for overshoot or ringing that

would indicate a stability problem.

The initial output voltage step may not be within the

bandwidth of the feedback loop, so the standard second

order overshoot/DC ratio cannot be used to determine

phase margin. In addition, a feedforward capacitor can

be added to improve the high frequency response, as

Table 1. Inductor Selection Table

INDUCTOR

INDUCTANCE

(µH)

DCR

(mΩ)

MAX CURRENT

(A)

DIMENSIONS

(mm)

HEIGHT

(mm)

MANUFACTURER

XAL4020 Series

1.0

1.5

2.2

13.25

21.45

35.20

8.7

7.1

5.6

4.3 × 4.3

2.1

Coilcraft

www.coilcraft.com

XAL4030 Series

3.3

4.7

6.8

26.0

40.1

67.4

5.5

4.5

3.6

4.3 × 4.3

3.1

IHLP-1616BZ-11 Series

1.0

2.2

4.5

3.25

4.3 × 4.7

Vishay

www.vishay.com

IHLP-2020BZ-01 Series

2.2

3.3

4.7

5.6

6.8

18.9

45.6

79.2

108

113

139

4.2

3.3

2.8

2.5

2.4

5.4 × 5.7

FDV0620 Series

2.2

3.3

4.7

5.7

3.2

2.8

6.7 × 7.4

Toko

www.toko.com

MPLC0525L Series

1.5

2.2

6.4

5.2

4.1

6.2 × 5.4

2.5

NEC/Tokin

www.nec-tokin.com

HCP0703 Series

1.5

2.2

3.3

4.7

6.8

8.2

5.5

4.5

7 × 7.3

Cooper Bussmann

www.cooperbussmann.com

RLF7030 Series

1.5

2.2

3.3

4.7

6.8

8.8

9.6

6.4

6.1

5.4

4.1

3.4

2.8

6.9 × 7.3

3.2

TDK

www.tdk.com

WE-TPC 4828 Series

1.2

1.8

2.2

2.7

3.3

3.1

2.7

2.5

2.35

2.15

4.8 × 4.8

2.8

Würth Elektronik

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