ISL6554CB Intersil, ISL6554CB Datasheet - Page 15

• Manufacturer Part Number: ISL6554CB
• Description: IC PWM CORE VOLTAGE REG 20-SOIC
• Manufacturer: Intersil

Specifications of ISL6554CB

• Applications: Controller, Intel Itanium®
• Voltage - Input: 4.75 ~ 5.25 V
• Number Of Outputs: 4
• Voltage - Output: 0.95 ~ 1.7 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

t
Ensure that both MOSFETs are within their maximum
junction temperature at high ambient temperature by
calculating the temperature rise according to package
thermal-resistance specifications. A separate heatsink may
be necessary depending upon MOSFET power, package
type, ambient temperature and air flow.
A diode, anode to ground, may be placed across Q2 and Q4
of Figure 1. These diodes function as a clamp that catches
the negative inductor swing during the dead time between
the turn off of the lower MOSFETs and the turn on of the
upper MOSFETs. The diodes must be a Schottky type to
prevent the lossy parasitic MOSFET body diode from
conducting. It is usually acceptable to omit the diodes and let
the body diodes of the lower MOSFETs clamp the negative
inductor swing, but efficiency could drop one or two percent
as a result. The diode’s rated reverse breakdown voltage
must be greater than the maximum input voltage.
P
P
SW
UPPER
LOWER
which increases the upper MOSFET switching losses.
=
=
I
----------------------------------------------------------- -
I
-------------------------------------------------------------------------------- -
O
O
2
2
×
×
r
r
DS ON
DS ON
V
(
(
IN
)
V
)
×
×
IN
V
(
V
OUT
15
IN
–
+
V
I
--------------------------------------------------------- -
OUT
O
×
V
)
IN
×
2
t
SW
×
F
SW
ISL6554
References
Intersil documents are available on the web at
www.intersil.com/
[1] HIP6601/HIP6603 Data Sheet, Intersil Corporation,
[2] HIP6602 Data Sheet, Intersil Corporation, File No. 4838
File No. 4819
February 11, 2005
FN9003.3