ISL78322 Datasheet, PDF (2/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Typical Applications
INPU T 2.8V TO 5.5V
C₁
2 x 10µF
ISL78322
LX1
PGND
V IN
FB1
EN1
EN2
IS L 7 8 3 2 2
PG
SYNC
LX2
PGND
FB2
L₁
1.2µH
C₂
22µF
R₂
316k
OUTPUT1
2 .5 V /2 A
C₃
10pF
R₃
100k
L₂
1 .2 µ H
C₄
22µF
R₅
200k
OUTPUT2
1 .8 V /1 .7 A
C₅
10pF
R₆
100k
FIGURE 2. TYPICAL APPLICATION DIAGRAM - DUAL INDEPENDENT OUTPUTS
V_OUT
C1
C2 (or C4)
C3 (or C5)
L1 (or L2)
R2 (or R5)
R3 (or R6)
0.8V
2x10µF
22µF
10pF
1.0~2.2µH
33k
100k
TABLE 1. COMPONENT VALUE SELECTION
1.2V
1.5V
1.8V
2x10µF
2x10µF
2x10µF
22µF
22µF
22µF
10pF
10pF
10pF
1.0~2.2µH
1.0~2.2µH
1.5~3.3µH
100k
150k
200k
100k
100k
100k
In Table 1, the minimum output capacitor value is given for
different output voltage to make sure the whole converter
system is stable. Output capacitance should increase to support
faster load transient requirement.
2.5V
2x10µF
22µF
10pF
1.5~3.3µH
316k
100k
3.3V
2x10µF
22µF
10pF
1.5~4.7µH
450k
100k
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2
FN7908.2
August 26, 2014