EL7640AILTZ Intersil, EL7640AILTZ Datasheet - Page 11

• 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

The current through MOSFET is limited to 3A peak. This
restricts the maximum output current based on the following
equation:
I
OMAX
=
⎛
⎝
I
LMT
–
∆I
--------
2
L
⎞
⎠
FBB
×
V
---------
V
IN
O
I
I
FB
REF
11
FIGURE 18. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER
COMPENSATION
AMPLIFIER
AMPLIFIER
CURRENT
GENERATOR
REFERENCE
GM
SLOPE
EL7640A, EL7641A, EL7642A
COMP
CLOCK
Where ∆I L is peak to peak inductor ripple current, and is set
by:
where f
∆I
AMPLIFIER
VOLTAGE
LOGIC
PWM
L
=
V
---------
S
L
IN
is the switching frequency.
×
---- -
f
D
S
SHUTDOWN
& START-UP
BUFFER
CONTROL
I
REF
I
FB
PGND
LX
May 15, 2006
FN6270.0