Datasheet

Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
MAX17122
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Pin Description (continued)
PIN NAME FUNCTION
31 IN3
Boost-Buck Regulator Power Input. Drain of the internal p-channel MOSFET connected between
IN3 and LX3.
32 RHVS
High-Voltage Stress Mode Output. When HVS is high, the RHVS open-drain output connects to
AGND. RHVS is high impedance when HVS is low.
33 FB1
Boost Regulator Feedback Input. Connect FB1 to the center of a resistive voltage-divider between
the step-up regulator output and AGND to set the step-up regulator output voltage. Place the
resistive voltage-divider within 5mm of FB1.
34 COMP1
Compensation Pin for the Step-Up Error Amplifier. Connect a series resistor and capacitor from
COMP1 to AGND. Typical values are 40kI and 330pF.
35 VL
5V Internal Linear-Regulator Output. Bypass VL to AGND with 1FF minimum. Provides power for
the internal MOSFET driving circuits, the PWM controllers, charge-pump regulators, logic and
references, and other analog circuitry. Provides 25mA load current when all switching regulators
are enabled. VL is active whenever IN is above its UVLO threshold.
37, 38 LX1
Step-Up Regulator Switching Node. LX1 is the drain of the internal n-channel MOSFET connected
between LX1 and PGND. Connect the inductor and Schottky catch diode to both LX1 pins and
minimize the trace area for low EMI.
39, 40 GND1 Step-Up Regulator Power Ground. Source of the internal power n-channel MOSFET.
— EP Exposed Pad. Connect EP to the ground plane to maximize thermal dissipation.