NCP5214A

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4

PIN FUNCTION DESCRIPTION

Pin

Symbol

Description

1

VDDQEN

VDDQ regulator enable input. High to enable.

2

VTTEN

VTT regulator enable input. High to enable.

3

FPWM

Forced PWM enable input. Low to enable forced PWM mode and disable power−saving mode.

4

SS

VDDQ Soft−start capacitor connection to ground.

5

VTTGND

Power ground for the VTT regulator.

6

VTT

VTT regulator output.

7

VTTI

Power input for VTT regulator which is normally connected to the VDDQ output of the buck regulator.

8

FBVTT

VTT regulator feedback pin for closed loop regulation.

9

AGND

Analog ground connection and remote ground sense.

10

DDQREF

External reference input which is used to regulate VTT and VTTREF to 1/2VDDQREF.

11

VCCA

5.0 V supply input for the IC’s control and logic section, which is monitored by undervoltage lock out

circuitry.

12

COMP

VDDQ error amplifier compensation node.

13

FBDDQ

VDDQ regulator feedback pin for closed loop regulation.

14

VTTREF

DDR reference voltage output.

15

PGOOD

Power good signal open−drain output.

16

OCDDQ

Overcurrent sense and program input for the high−side FET of VDDQ regulator. Also the battery voltage

input for the internal ramp generator to implement the voltage feedforward rejection to the input voltage

variation. This pin must be connected to the VIN through a resistor to perform the current limit and volt-

age feedforward functions.

17

BOOST

Positive supply input for high−side gate driver of VDDQ regulator and boost capacitor connection.

18

TGDDQ

Gate driver output for VDDQ regulator high−side N−Channel power FET.

19

SWDDQ

VDDQ regulator inductor driven node, return for high−side gate driver, and current limit sense input.

20

VCCP

Power supply for the VDDQ regulator low−side gate driver and also supply voltage for the bootstrap

capacitor of the VDDQ regulator high−side gate driver supply.

21

BGDDQ

Gate driver output for VDDQ regulator low−side N−Channel power FET.

22

PGND

Power ground for the VDDQ regulator.

23

THPAD

Copper pad on bottom of IC used for heatsinking. This pin should be connected to the ground plane un-

der the IC.