ISL6237IRZ Intersil, ISL6237IRZ Datasheet - Page 20

• Manufacturer Part Number: ISL6237IRZ
• Description: IC MAIN PWR CTRLR QUAD 32-QFN
• Manufacturer: Intersil

Specifications of ISL6237IRZ

• Applications: Controller, Notebook Computers
• Voltage - Input: 5.5 ~ 25 V
• Number Of Outputs: 4
• Operating Temperature: -40°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

.
(t
or OPEN), VOUT1
(t
VOUT2
(t
VOUT1
(t
or OPEN), VOUT2
ON
ON
ON
ON
= GND, REF,
= GND),
= VCC),
= VCC, REF,
SMPS
TABLE 2. APPROXIMATE K-FACTOR ERRORS
FREQUENCY
SWITCHING
(kHz)
400
500
200
300
20
K-FACTOR
(µs)
2.5
2.0
5.0
3.3
APPROXIMATE
ERROR (%)
K-FACTOR
±10
±10
±10
±10
ISL6237
For loads above the critical conduction point, the actual
switching frequency is:
where:
• V
• V
• t
f
=
inductor discharge path, including synchronous rectifier,
inductor, and PC board resistances
charging path, including high-side switch, inductor, and PC
board resistances
ON
DROP1
DROP2
------------------------------------------------------ -
t
ON
V
is the on-time calculated by the ISL6237
OUT
(
V
IN
is the sum of the parasitic voltage drops in the
+
is the sum of the parasitic voltage drops in the
+
V
V
DROP1
DROP2
)
March 18, 2008
FN6418.4
(EQ. 2)