MAX8758 Maxim Integrated Products, MAX8758 Datasheet - Page 9

• Manufacturer Part Number: MAX8758
• Description: Step-Up Regulator
• Manufacturer: Maxim Integrated Products

PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
NAME
COMP
MODE
NEGB
SHDN
PGND
SUPB
OUTB
POSB
FREQ
GND
GON
LDO
OUT
DRN
THR
N.C.
SRC
CTL
DLP
I.C.
_______________________________________________________________________________________
SS
LX
FB
IN
Step-Up Regulator with Switch Control
and Operational Amplifier for TFT LCD
Analog Ground
Internal High-Voltage-Switch Common Connection. GON is the output of the high-voltage-switch-
control block. GON is internally pulled to PGND through a 1kΩ resistor in shutdown. See the High-
Voltage Switch Control section for details.
H i g h- V ol tag e, S w i tch- C ontr ol Bl ock Ti m i ng P i n. S ee the H i g h- V ol tag e S w i tch C ontr ol secti on for d etai l s.
High-Voltage, Switch-Control Block Delay Pin. Connect a capacitor from DLP to GND to set the delay
time. A 5µA current source charges C
See the High-Voltage Switch Control section for details.
GON Falling Regulation Adjustment Pin. Connect THR to the center of a resistive voltage-divider
between LDO or OUT and GND to adjust the V
is 10 x V
Operational Amplifier Supply Input. Bypass SUPB to GND with a 0.1µF capacitor.
Operational Amplifier Output
Operational Amplifier Inverting Input
Operational Amplifier Noninverting Input
No Connection. Not internally connected.
5V Internal Linear Regulator Output. This regulator powers all internal circuitry except the operational
amplifier. Bypass LDO to GND with a 0.22µF or greater ceramic capacitor.
Internal Linear Regulator Supply Pin. OUT is the supply input of the internal 5V linear regulator.
Connect OUT directly to the output of the step-up regulator.
Internally Connected. Make no connection to this pin.
Soft-Start Control Pin. Connect a capacitor between SS and GND to set the soft-start period of the
step-up regulator. See the Bootstrapping and Soft-Start section for details.
Error Amplifier Compensation Pin. See the Step-Up Regulator Loop Compensation section for details.
Frequency-Select Pin. Connect FREQ to GND for 600kHz operation, and connect FREQ to IN for
1.2MHz operation.
Supply Pin. Bypass IN to GND with a 1µF ceramic capacitor. Place the capacitor close to the IN pin.
Switching Node. LX is the drain of the internal power MOSFET. Connect the inductor and the Schottky
diode to LX and minimize trace area for low EMI.
Shutdown Control Pin. Pull SHDN low to turn off the step-up regulator, the operational amplifier, and
the switch control block.
Feedback Pin. The FB regulation point is 1.24V (typ). Connect FB to the center of a resistive voltage-
divider between the step-up regulator output and GND to set the step-up regulator output voltage.
Place the divider close to the FB pin.
Power Ground
High-Voltage, Switch-Control Block-Mode Selection Timing-Adjustment Pin. See the High-Voltage
Switch Control section for details. MODE is high impedance when it is connected to LDO. MODE is
internally pulled down by a 1kΩ resistor during UVLO, when V
High-Voltage, Switch-Control Input. DRN is the drain of the internal high-voltage p-channel MOSFET
connected to GON.
High-Voltage Switch-Control Input. SRC is the source of the internal high-voltage p-channel MOSFET.
THR
. See the High-Voltage Switch Control section for details.
DLP
. DLP is internally pulled to GND by a resistor in shutdown.
FUNCTION
GON
falling regulation level. The actual regulation level
DLP
< 0.5 x V
Pin Description
LDO
, or in shutdown.
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