SC908MLTRT Просмотр технического описания (PDF) - Semtech Corporation

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SC908MLTRT

Power Management IC for Single-Cell Li-Ion Devices

Semtech Corporation 

SC908

Pin Descriptions

Pin # Pin Name Pin Function

1

VAD

Charger input pin

Adapter input internal-regulation node which also serves as supply for EN_NTC, RTIME, and all input-referenced

2

VSYS

(vs. battery-referenced or regulated output-referenced) pull-ups; load must not exceed 5mA.

3

IPRGM Pin for setting constant current charging current — connect resistor to ground to set current.

4

ITERM

Pin for setting termination and precharge current — connect resistor to ground to set current.

Charge timer pin — connect a resistor to ground to set timer, ground to disable the timer. Timer enabled with

5

RTIME

internally programmed default time is selected with RTIME tied to VSYS.

6

RLBAT

Resistor is connected to ground to set Low Battery voltage threshold.

LDO voltage input — can be connected to either the battery supply (BAT) or the switching regulator output

7

LVIN

(SVOUT). No other connections are permitted.

8

LVOUT

LDO voltage output

9

LFB

LDO feedback voltage input

Bandgap reference bypass pin — connected to a 10nF capacitor to analog ground. No other connections are

10

VREF

permitted.

11

AGND

Analog ground pin — refer to grounding considerations in application section.

12

DGND

Digital ground pin — refer to grounding considerations in application section.

13

LEN

LDO enable pin — active high

14

SFB

DC-DC converter feedback input — connect voltage divider from output to this pin to set output voltage.

Charging Fault indicator — open drain output is active low when a charging fault has occurred. Also, together

15

FLTB

with LBATB, indicates when battery discharges below a programmable voltage set by RLBAT resistor.

Low Battery indicator — open drain output is active low when battery discharges below 3.3V, and, together with

16

LBATB

LBATB, indicates when battery discharges below a programmable voltage set by RLBAT resistor.

17

CPB

Charger Present indicator — open drain output is active low when a valid VAD input voltage is present.

18

SEN

DC-DC converter enable pin — active high

Charging-In-Progress indicator — open drain output is active low when charging until charging current drops

19

CHRGB below the programmed termination current, or until charging is disabled by charge timeout or EN_NTC disable or

NTC temperature fault.

20

PGND

DC-DC converter power ground pin — No other connection is permitted.

DC-DC converter output — connect to an inductor between this point and SVOUT (the DC-DC converter load con-

21

SLX

nection).

22

BAT

Charger output pin, also DC-DC converter input pin — connect to the positive battery terminal.

NTC thermistor input — charger is enabled if voltage is between 0.3 × VSYS and 0.75 × VSYS. Charger is disabled if

23

EN_NTC

voltage is below 1V. Battery temperature fault otherwise.

24

BSEN

Battery Kelvin sense pin — independent connection is tied directly to the battery positive terminal.

T

Thermal Pad Connect to ground plane with thermal vias directly under pad.

13

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