6 Pin Configuration and Functions

12

GND

11

10

BAT

9

GND

VSET

(Not to scale)

Thermal

Pad

1

VBUS

2

REGN

3

STAT

4

ICHG

7

8

5

6

Figure 6-1. RTE Package 16-Pin WQFN Top View

Table 6-1. Pin Functions

PIN

I/O(1)

DESCRIPTION

NAME

NO.

VBUS

1

P

Charger Input Voltage. The internal n-channel reverse block MOSFET (RBFET) is connected between

VBUS and PMID with VBUS on source. Place a 2.2uF ceramic capacitor from VBUS to GND and place it

as close as possible to IC.

PMID

16

P

Connected to the drain of the reverse blocking MOSFET (RBFET) and the drain of high-side MOSFET

(HSFET). Place ceramic 10μF on PMID to GND and place it as close as possible to IC.

SW

13,14

P

Switching node. Connected to output inductor. Internally SW is connected to the source of the n-channel

HSFET and the drain of the n-channel LSFET. Connect the 0.047μF bootstrap capacitor from SW to BTST.

BTST

15

P

High-Side FET Driver Supply. Internally, the BTST is connected to the cathode of the internal boost-strap

diode. Connect the 0.047μF bootstrap capacitor from SW to BTST.

GND

11,12

P

Ground. Connected directly to thermal pad on the top layer. A single point connection is recommended

between power ground and analog ground near the IC GND pins.

REGN

2

P

Low-Side FET driver positive supply output. Connect a 2.2μF ceramic capacitor from REGN to GND. The

capacitor should be placed close to the IC.

BAT

10

AI

Battery Voltage Sensing Input. Connect this pin to the positive terminal of the battery pack and the node of

inductor output terminal. 10-µF capacitor is recommended to connect to this pin.

TS

7

AI

Battery Temperature Protection Voltage Input. Connect a negative temperature coefficient thermistor

(NTC). Program temperature window with a resistor divider from REGN to TS and TS to GND. Charge

suspends when TS pin voltage is out of range. When TS pin is not used, connect a 10-kΩ resistor from

REGN to TS and a 10-kΩ resistor from TS to GND. It is recommended to use a 103AT-2 thermistor.

ICHG

4

AI

Charge current program input. Connect a 1% resistor RICHG from this pin to ground to program the

When ICHG pin is pulled to ground or left open, the charger stop switching and STAT pin starts blinking.

STAT

3

AO

Charge Status Indication Output. This pin is open drain output. Connect this pin to REGN via a current

limiting resistor and LED. The STAT pin indicates charger status as:

•

Charge in progress: STAT pin is pulled LOW

•

Charge completed, charge disabled by EN: STAT pin is OPEN

•

Fault conditions: STAT pin blinks.

VSET

9

AI

Charge Voltage Setting Input. VSET pin sets battery charge voltage. Program battery regulation voltage

with a resistor pull-down from VSET to GND:

•

Floating (R > 200kΩ±10%): 4.1V

•

Shorted to GND (R < 510Ω): 4.2V

•

R = 51kΩ ± 10%: 4.35V

•

R = 10kΩ ± 10%: 4.4V

The maximum allowed capacitance on this pin is 50pF.

POL

5

AI

This pin must be floating.

EN

6

AI

Device Disable Input. The device is enabled with EN pin floating or pulled low. The device is disabled if EN

pin is pulled high.

BQ25302

SLUSCZ3 – OCTOBER 2020

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