CDH2D09 datasheet(21/44 Pages) MAXIM

21 / 44 page

PMIC with Integrated Charger and

Smart Power Selector for Handheld Devices

______________________________________________________________________________________

Pin Description (continued)

NAME

FUNCTION

LX1

Inductor Switching Node for REG1. LX1 is internally pulled to PG1 by 1k

Ω in shutdown.

PG1

Power Ground for the REG1 Step-Down Regulator

PG3

Power Ground for the REG3 Step-Down Regulator

LX3

Inductor Switching Node for REG3. LX3 is internally pulled to PG3 by 1k

Ω in shutdown.

PV3

Power Input for the REG3 Step-Down Regulator. Connect PV3 to SYS. Bypass PV3 to PG3 with a

4.7µF ceramic capacitor.

IC Supply Output. VL is an LDO output that powers the MAX8671X internal battery-charger circuitry.

VL provides 3.3V at 3mA to power external circuitry when DC or USB is present. Connect a 0.1µF

capacitor from VL to AGND.

FB3

Feedback Input for REG3. Connect FB3 to the center of a resistor voltage-divider from the REG3

output capacitors to AGND to set the output voltage from 1V to VSYS.

DISET

DC Input Current-Limit Select Input. Connect a resistor from DISET to AGND (RDISET) to set the DC

current limit. See Table 2 for more information.

CISET

Charge Rate Select Input. Connect a resistor from CISET to AGND (RCISET) to set the fast-charge

current limit, prequalification-charge current limit, and top-off threshold.

Charge Timer Programming Node. Connect a capacitor from CT to AGND (CCT) to set the time

required for a fault to occur in fast-charge or prequalification modes. Connect CT to AGND to disable

the fast-charge and prequalification timers.

THM

Thermistor Input. Connect a negative temperature coefficient (NTC) thermistor that has a good

thermal contact with the battery from THM to AGND. Connect a resistor equal to the thermistor

resistance at +25°C from THM to VL. Charging is suspended when the battery is outside the hot or

cold limits.

BAT

Positive Battery Terminal Connection. Connect BAT to the positive terminal of a single-cell Li+/Li-Poly

battery.

SYS

System Supply Output. Bypass SYS to power ground with a 10µF ceramic capacitor.

When a valid voltage is present at USB or DC and not suspended (USUS = low), SYS is limited to

5.3V (VSYS-REG). When the system load (ISYS) exceeds the input current limit, SYS drops below VBAT

by VBSREG allowing both the external power source and the battery service SYS.

SYS is connected to BAT through an internal system load switch (RBS) when a valid source is not

present at USB or DC.

PEN1

Input Current-Limit Control 1. See Table 1 for more information.

CST2

Open-Drain Charger Status Output 2. CST1 and CST2 indicate four different charger states. See

Table 3 for more information.

UOK

Active-Low, Open-Drain USB Power-OK Output. UOK is low when VUSB is within its valid operating

range.

CST1

Open-Drain Charger Status Output 1. CST1 and CST2 indicate four different charger states. See

Table 3 for more information.

PEN2

Input Current-Limit Control 2. See Table 1 for more information.

—EP

Exposed Paddle. Connect the exposed paddle to AGND. Connecting the exposed paddle does not

remove the requirement for proper ground connections to AGND, PG1, PG2, and PG3.

CDH2D09 Datasheet(PDF) 21 Page - Maxim Integrated Products

CDH2D09 Datasheet(HTML) 21 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Descarga

Enlace URL