ISL6504 Intersil Corporation, ISL6504 Datasheet - Page 12

• Manufacturer Part Number: ISL6504
• Description: Multiple Linear Power Controller with ACPI Control Interface
• Manufacturer: Intersil Corporation

Q1
The NPN transistor used as sleep state pass element on the
3.3V
at 1.5V V
operating temperature range. For larger current ratings on
the 3.3V
is equally extended), selection criteria for Q1 include an
appropriate current gain (h
Q2, Q4
These N-Channel MOSFETs are used to switch the 3.3V
and 5V inputs provided by the ATX supply into the
3.3V
S1) state. The main criteria for the selection of these
transistors is output voltage budgeting. The maximum
r
expressed with the following equation:
V
V
I
r
OUTmax
DS(ON)
DS ON
INmin
OUTmin
(
DUAL
DUAL
)max
- minimum input voltage
DUAL
allowed at highest junction temperature can be
CE
- maximum output current
- minimum output voltage allowed
/3.3V
output has to have a minimum current gain of 100
=
and 650mA I
+3.3VDUAL/3.3VSB
output (providing the ATX 5V
V
-------------------------------------------------- -
+12VIN
+3.3VIN
SB
+5VSB
INmin
+5VIN
+1.5VSB
‘FAULT’
and 5V
S5
S3
I
OUTmax
–
V
OUTmin
CE
DUAL
fe
HUF76113T3S
) and saturation characteristics.
12
throughout the in-circuit
outputs while in active (S0,
Q2
, where
+
10mF
C5
R1
1k
FIGURE 12. TYPICAL ISL6504/A APPLICATION DIAGRAM
C4
330mF
+
SB
output rating
R3
1k
2SD1802
ISL6504, ISL6504A
0.1mF
Q1
C7
3V3DLSB
FAULT
1V5SB
3V3DL
3V3
S3
S5
SS
3
9
7
13
5
2
1
6
5VSB
ISL6504/A
U1
8
Q3
If a P-Channel MOSFET is used to switch the 5V
the ATX supply into the 5V
then the selection criteria of this device is proper voltage
budgeting. The maximum r
achieved with only 4.5V of gate-to-source voltage, so a logic
level MOSFET needs to be selected. If a PNP device is
chosen to perform this function, it has to have a low-
saturation voltage while providing the maximum sleep
current and have a current gain sufficiently high to be
saturated using the minimum drive current (typically 20mA).
ISL6504 Application Circuit
Figure 12 shows a typical application circuit for the
ISL6504/A. The circuit provides the 3.3V
voltage, the ICH4 resume well 1.5V
voltage identification output, and the 5V
keyboard/mouse voltage from +3.3V, +5V
+12VDC ATX supply outputs. Q3 can also be a PNP
transistor, such as an MMBT2907AL. For additional, more
detailed information on the circuit, including a Bill-of-
Materials and circuit board description, see Application Note
AN1001. Also see Intersil Corporation’s web page
(www.intersil.com).
16
GND
14
15
11
10
12
4
VID_PG
VID_CT
1V2VID
5VDLSB
DLA
5VDL
10mF
C3 +
C2
0.1mF
C1
1mF
+
C6
220mF
R2
10k
Q4
HUF76113T3S
Q3
FDV304P
DUAL
DS(ON)
output during sleep states,
, however, has to be
SB
+1.2VVID
+5VDUAL
‘VID PGOOD’
voltage, the 1.2V
DUAL
DUAL
SB
, +5V, and
/3.3V
SB
output of
SB
VID