NCP3800V

http://onsemi.com

3

Table 1. FUNCTIONAL PIN DESCRIPTION

Function

Pin

Description

ACOK

5

An open drain device indicates that status of the ac adaptor. Connecting a 10 kW resistor to external

pull−up power supply. A high state indicates the adaptor is present.

ACFET

4

Gate drive to the series N−FET(s) from the ac adaptor to the system

ACIN

6

This Input detects the presence of the ac adaptor which is scaled by a voltage divider to determine if the

adaptor is present and whether its output voltage is in the correct range for proper operation.

BOOT

17

The bootstrap pin connects to diode and capacitor to provide the drive to the upper gate.

CSON

12

The negative side of the output (charge) current sense resistor is connected to this node. This pin also

plays the role of battery pack voltage sensing.

CSOP

13

The positive side of the output (charge) current sense resistor is connected to this node.

CSSN

1

The negative side of the input (adapter) current sense resistor is connected to this node.

CSSP

2

The positive side of the input (adapter) current sense resistor is connected to this node.

DCIN

20

This pin is the DC input to the chip. It provides bias power for the chip and also for the internal LDO.

GND

14

This is the ground reference pin for the chip.

ICM

7

The input current monitor provides a voltage signal that is the equivalent total input current or charge

current drop across the sense resistor multiplied by a ratio programmed through ChargeOption() register.

FETCS

3

Common source pin of the series FET(s) from the AC adaptor to the system and charging circuit

LGATE

15

This pin provides the gate drive for the lower FET (synchronous rectifier) gate

PGND

PAD

This pin is the ground reference for the gate drive circuit.

PHASE

19

This pin connects to the switch node

SCL

9

This pin is an open−drain output for the SMBus Data I/O. An external pullup resistor should be connec-

ted according to SMBus specifications.

SDA

8

This pin is the SMBus Clock Input. An external pullup resistor should be connected according to SMBus

specifications.

UGATE

18

This pin provides the gate drive for the upper FET (switch) gate.

BATFET

11

Gate drive to the external N−FET connecting the battery to the system rail

VDDP

16

This is the regulated supply for the switch drive. It should be bypassed with a >0.1 mF ceramic capacitor.

NC

10

Not connected. Recommended to be grounded.

Table 2. MAXIMUM RATINGS

Rating

Symbol

Value

Unit

DCIN, CSSP, CSSN, CSOP, CSON, FETCS to GND

PHASE

ACFET, UGATE, BOOT, BATFET to GND

All other pins

−0.3 to 30

−2.0 to 30

−0.3 to 36

−0.3 to 6.5

V

Thermal Resistance, Junction−to−Air

45

°C/W

Operating junction temperature range

0 to 125

°C

Ambient temperature range

−10 to 100

°C

Non−operating junction temperature range

−55 to 150

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.