MAX8795AGCJ/V+T Maxim Integrated Products, MAX8795AGCJ/V+T Datasheet - Page 19

• Manufacturer Part Number: MAX8795AGCJ/V+T
• Description: Display Drivers TFT-LCD DC-DC Conver ter with Operational
• Manufacturer: Maxim Integrated Products

Specifications of MAX8795AGCJ/V+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 6. Power-Up Sequence
Figure 7. Switch-Control Block
VOLTAGE
INPUT
OK
2.25V
BEGINS
SOFT-
START
DEL
CTL
IN
12ms
1.05V
SOFT-
START
ENDS
REF
______________________________________________________________________________________
5μA
CONTROL
ENABLED
SWITCH
1.25V
TFT-LCD DC-DC Converter with
V
V
V
V
V
V
IN
REF
MAIN
GON
GOFF
DEL
C
(typ), the switch-control block is and op amps are enabled
as shown in Figure 6. After the switch-control block is
enabled, COM can be connected to SRC or DRN through
the internal p-channel switches, depending upon the state of
CTL. Before startup and when IN is less than V
internally connected to AGND to discharge C
C
block startup delay times using the following equation:
The switch-control input (CTL) is not activated until all
four of the following conditions are satisfied: the input
voltage exceeds V
regulators is complete, there is no fault condition detect-
ed, and V
vated and if CTL is high, the 5Ω internal p-channel
switch (Q1) between COM and SRC turns on and the
Operational Amplifiers
DEL
DEL
. Once the C
to set the initial start-up delay and the switch-control
DEL
2.25V
FB OK
FBP OK
FBN OK
C
DEL
exceeds its turn-on threshold. Once acti-
=
DEL
UVLO
DELAY TIME
MAX8795A
capacitor voltage exceeds 1.25V
, the soft-start routine of all the
Q1
Q2
_
Switch-Control Block
×
1 25
I A
6
.
μ
V
SRC
COM
DRN
UVLO
DEL
. Select
, DEL is
19