ISL78020ANZ-T Intersil, ISL78020ANZ-T Datasheet - Page 11

• Manufacturer Part Number: ISL78020ANZ-T
• Description: IC BOOST REG HI-PWR 32-TQFP
• Manufacturer: Intersil

Specifications of ISL78020ANZ-T

• Applications: LCD Display, Automotive
• Current - Supply: 2.5mA
• Voltage - Supply: 2.6 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• 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 Equation 3:
I
OMAX
=
⎛
⎝
I
LMT
–
ΔI
--------
2
L
⎞
⎠
FBB
×
V
---------
V
IN
O
I
I
FB
REF
11
FIGURE 17. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER
COMPENSATION
AMPLIFIER
AMPLIFIER
CURRENT
GENERATOR
REFERENCE
GM
SLOPE
ISL78020, ISL78022
COMP
(EQ. 3)
CLOCK
Where ΔI L is peak to peak inductor ripple current, and is set
by Equation 4:
where f
ΔI
AMPLIFIER
VOLTAGE
LOGIC
PWM
L
=
V
---------
S
L
IN
is the switching frequency.
×
---- -
f
D
S
AND START-UP
SHUTDOWN
BUFFER
CONTROL
I
REF
I
FB
PGND
LX
December 6, 2007
FN6386.2
(EQ. 4)