EL7640AILTZ Intersil, EL7640AILTZ Datasheet - Page 16

• Manufacturer Part Number: EL7640AILTZ
• Description: IC CONV DC/DC TFT-LCD 32-QFN
• Manufacturer: Intersil

Specifications of EL7640AILTZ

• Applications: Converter, TFT, LCD
• Voltage - Input: 2.6 ~ 5.5 V
• Number Of Outputs: 3
• Voltage - Output: 5.5 ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-WQFN, 32-miniQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Component Selection for Start-up Sequencing and
Fault Protection
The C
to stabilize the V
22nF to 1µF and should not be more than five times the
capacitor on C
The C
range from 22nF minimum to several microfarads – only
limited by the leakage in the capacitor reaching µA levels.
NOTE: Not to scale
REF
DEL
capacitor is typically 100nF and has a usable
capacitor is typically set at 220nF and is required
DEL
REF
V
to ensure correct start-up operation.
ON SLICE
output. The range of C
CIRCUIT
V
16
BOOST
V
CDEL
V
V
V
REF
OFF
ON
IN
REF
EL7640A, EL7641A, EL7642A
FIGURE 23. START-UP SEQUENCE
is from
START-UP SEQUENCE
t
t
ON
DEL1
TIMED BY C
DEL
C
above). Note that with 100nF on C
be typically 23ms and the use of a larger/smaller value will
vary this time proportionally (e.g. 1µF will give a fault time-
out period of typically 230ms).
Fault Sequencing
The EL7640A, EL7641A and EL7642A have an advanced
fault detection system which protects the IC from both
adjacent pin shorts during operation and shorts on the output
DEL
t
DEL3
t
DEL2
should be at least 1/5 of the value of C
OPERATION
NORMAL
PRESENT
FAULT
DEL
the fault time-out will
REF
(see
May 15, 2006
FN6270.0