MAX1518 Maxim Integrated Products, MAX1518 Datasheet - Page 11

• Manufacturer Part Number: MAX1518
• Description: (MAX1516 - MAX1518) TFT-LCD DC-DC Converters
• Manufacturer: Maxim Integrated Products

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PIN
20
21
22
23
24
25
26
27
28
29
30
31
32
MAX1516 MAX1517
COMP
DRVN
DRVP
COM
DRN
N.C.
FBN
FBP
DEL
CTL
LX
FB
IN
______________________________________________________________________________________
COMP
NAME
DRVN
DRVP
COM
DRN
N.C.
FBN
DEL
FBP
CTL
LX
FB
IN
MAX1518
COMP
OUT5
DRVP
DRVN
COM
DRN
FBP
FBN
DEL
CTL
FB
LX
IN
TFT-LCD DC-DC Converters with
Operational-Amplifier 5 Output. Not Internally Connected for the MAX1517 and
MAX1516.
N-Channel Power MOSFET Drain and Switching Node. Connect the inductor and
Schottky diode to LX and minimize the trace area for lowest EMI.
Supply Voltage Input. IN can range from 2.6V to 5.5V.
Step-Up Regulator Feedback Input. Regulates to 1.236V (nominal). Connect a resistive
voltage-divider from the output (V
divider within 5mm of FB.
Step-Up Regulator Error-Amplifier Compensation Point. Connect a series RC from
COMP to AGND. See the Loop Compensation section for component selection
guidelines.
Gate-On Linear-Regulator Feedback Input. FBP regulates to 1.25V (nominal). Connect
FBP to the center of a resistive voltage-divider between the regulator output and AGND
to set the gate-on linear-regulator output voltage. Place the resistive voltage-divider
close to the pin.
Gate-On Linear-Regulator Base Drive. Open drain of an internal n-channel MOSFET.
Connect DRVP to the base of an external pnp pass transistor. See the Pass-Transistor
Selection section.
Gate-Off Linear-Regulator Feedback Input. FBN regulates to 250mV (nominal).
Connect FBN to the center of a resistive voltage-divider between the regulator output
and REF to set the gate-off linear-regulator output voltage. Place the resistive voltage-
divider close to the pin.
Gate-Off Linear-Regulator Base Drive. Open drain of an internal p-channel MOSFET.
Connect DRVN to the base of an external npn pass transistor. See the Pass-Transistor
Selection section.
High-Voltage Switch Delay Input. Connect a capacitor from DEL to AGND to set the
high-voltage switch startup delay.
High-Voltage Switch Control Input. When CTL is high, the high-voltage switch between
COM and SRC is on and the high-voltage switch between COM and DRN is off. When
CTL is low, the high-voltage switch between COM and SRC is off and the high-voltage
switch between COM and DRN is on. CTL is inhibited by the undervoltage lockout and
when the voltage on DEL is less than 1.25V.
Switch Input. Drain of the internal high-voltage back-to-back p-channel MOSFETs
connected to COM.
Internal High-Voltage MOSFET Switch Common Terminal. Do not allow the voltage on
COM to exceed V
SRC
.
Operational Amplifiers
MAIN
Pin Description (continued)
FUNCTION
) to FB to analog ground (AGND). Place the
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