SP6122_04 Datasheet, PDF (5/19 Pages) Sipex Corporation – Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters

BLOCK DIAGRAM
Soft Start
SS
-
+
ENABLE 4
1.25V
Reference
-
+
1V
Reset
Dominant
POR _{R QB}
Run
Latch
SQ
V_OUT 3
X K1
Reference
Comparator
-
+
Reset
Dominant
R
SS
Latch
PFET OFF
S QB
Soft Start Clock
V_OUT * K1
T_ON
Start On Time
Min On Time Clock
RESET
Dominant
S QB
Loop
Latch
R _Q ^{PFET OFF}
Driver
Logic
I_SET 6
20µA
(4300 ppm/°C)
I_SENSE 5
I_SET
I_SENSE
PDRV
+
X 3.3
-
500mV
(3800 ppm/°C)
I_SET < 1V
Low IQ
Blank _{200ns Blanking}
One Shot
Over Current
(Gated S&H)
+
-
POR
Reset
Dominant
S
Q ^FAULT
R
POR
1 VCC
PFET
Driver
8 PDRV
7 GND
2 FFLAG
Date: 10/02/04
SP6122 Low Voltage, Micro 8, PFET, Buck Controller
5
© Copyright 2004 Sipex Corporation