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ISL88550AIRZ Datasheet(PDF) 11 Page - Intersil Corporation

Part # ISL88550AIRZ
Description  Synchronous Step-Down Controller with Sourcing and Sinking LDO Regulator
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL88550AIRZ Datasheet(HTML) 11 Page - Intersil Corporation

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11
FN6168.0
October 12, 2005
FIGURE 21. FUNCTIONAL BLOCK DIAGRAM
ON TIME
COMPUTE
TRIG
1-SHOT
tON
Q
TRIG
1-SHOT
t
OFF
Q
INTREF
INTREF
1.16 X
QUAD Level
Decoder
Blank
OVP/UVP
LATCH
VDD-1V
1.0V
PHASE
PHASE
ZERO CROSSING
BUCK ON/OFF
Bias
VTT ON/OFF
VTTR ON/OFF
20mSec
Timer
POR
0.7 x INTREF
INTREF+10%
INTEREF-10%
N
FB
DECODER
VOUT=1.8V
VOUT=2.5V
DISCHARGE
LOGIC
VDD
2V
REFERENCE
INTREF
INTREF/2+10%
INTEREF/2-10%
INTREF/2+10%
INTEREF/2-10%
N
OUT 0.1V
POWER DOWN
N
+
-
+
-
N
N
VDD
VDD
CURRENT
LIMIT
REFIN/2
OUT
PGND2
VTT ILIM
VIN
LGATE
PGND1
ILIM
OUT
SKIP#
AVDD
GND
REF
VTTS
REFIN
VTTI
VTT
PGND2
VTTR
SS
POK2
FB
POK1
STBY#
SHDNA#
OVP/UVP
TON
S
R
Q
S
R
Q
SHUTDOWN
DECODER
10
10k
10k
BOOT
UGATE
PHASE
VDD
ON/OFF
ISL88550A


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