CDH2D09 datasheet(27/44 Pages) MAXIM

27 / 44 page

PMIC with Integrated Charger and

Smart Power Selector for Handheld Devices

______________________________________________________________________________________

To support common 500mA to 1000mA wall adapters

at the DC input, pull PEN1 high. With PEN1 pulled high,

the DC current limit is set by an external resistor from

DISET to AGND (RDISET). Choose RDISET based on the

current capability of the AC-to-DC adapter (IADPTR) as

follows:

For the selected value of RDISET, calculate the DC cur-

rent limit (IDCLIM) as follows (Table 2, Figure 4):

To support USB power sources at the DC input, pull

PEN1 low. With PEN1 low, drive PEN2 and USUS to

select between three internally set USB-related current

limits as shown in Table 1. Choose 100mA for low-

power USB mode. Choose 500mA for high-power USB

mode. Choose suspend to reduce the DC current to

0.11mA (typ) for both USB suspend mode and uncon-

figured OTG mode. To comply with the USB 2.0 specifi-

cation, each device must be initially configured for low

power. After USB enumeration, the device can switch

from low power to high power if given permission from

the USB host. When the load exceeds the current limit,

SYS drops below BAT by VBSREG and the battery sup-

plies supplemental load current.

If the DC power input is not required, connect DC to

ground or leave it unconnected.

The MAX8671X reduces the USB and DC current limits

by 5%/°C when the die temperature exceeds +100°C.

The system load (ISYS) has priority over the charger cur-

rent, so input current is first reduced by lowering charge

current. If the junction temperature still reaches +120°C

in spite of charge-current reduction, no input current is

drawn from USB and DC; the battery supplies the entire

load and SYS is regulated below BAT by VBSREG. Note

that this on-chip thermal-limiting circuit is not related to

and operates independently from the thermistor input.

DC Power-OK Output (

DOK)

As shown in Figure 5, the DC power-OK output (DOK)

is an open-drain, active-low output. The DOK output

pulls low when the voltage from DC to AGND (VDC) is

between VDCH (typically 6.9V) and VDCL (typically

4.0V).

The DC power-OK circuitry remains active in thermal

overload and DC suspend. If the DC power-OK output

feature is not required, connect DOK to ground or leave

disconnected.

DCLIM

DISET

=×

2000

DISET

ADPTR

≥×

2000

500

700

600

800

900

1000

3.0

4.0

4.5

3.5

5.0

5.5

6.0

RDISET (k

Ω)

DC INPUT CURRENT LIMIT vs.

DC INPUT CURRENT-LIMIT RESISTOR

PEN1 = HIGH

Figure 4. Programming DC Current Limit

RDISET (k

Ω)IDCLIM (mA)

RDISET (k

Ω)IDCLIM (mA)

3.01

997

4.32

694

3.09

971

4.42

679

3.16

949

4.53

662

3.24

926

4.64

647

3.32

904

4.75

632

3.40

882

4.87

616

3.48

862

4.99

601

3.57

840

5.11

587

3.65

822

5.23

574

3.74

802

5.36

560

3.83

783

5.49

546

3.92

765

5.62

534

4.02

746

5.76

521

4.12

728

5.90

508

4.22

711

6.04

497

Table 2. DC Current Limit for Standard

Values of RDISET

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