High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

10

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DC/USB Mode and

Charging Current Setting

SET is a logic input that sets DC/USB charging mode

and charging current. Drive SET low or leave it uncon-

nected to enable DC charging mode. Drive SET high to

enable USB charging mode (see Table 1). SET can

also be driven by series pulses to program the charg-

ing current in both DC and USB mode.

DC Charge Mode

Drive SET low or leave it unconnected to enable DC

charging mode. Subsequent pulses on SET program

the charging current and the top-off threshold. There

are seven fast-charge current options and four top-off

threshold options. Default fast-charge current and top-

off threshold current are 500mA and 80mA. Pulse SET

high (1µs to 1ms pulse width) subsequently to realize

charging current and top-off threshold programming

and transition. After the 28th pulse, the MAX8804W/

MAX8804Y/MAX8804Z go into the default mode and

start a new cycle. See Tables 2 and 3 and Figure 3 to

set the desired charging current and top-off threshold.

Drive SET high longer than 2ms to disable the DC

charging-control circuitry.

Table 1. SET Truth Table

SET

CHARGER STATUS

0

Invalid

Invalid

Off

0

Invalid

Valid

Off

0

Valid

Invalid

DC charging mode enabled,

USB charging mode disabled

0

Valid

Valid

DC charging mode enabled,

USB charging mode disabled

1

Invalid

Invalid

Off

1

Invalid

Valid

DC charging mode disabled,

USB charging mode enabled

1

Valid

Invalid

Off

1

Valid

Valid

Off

Table 2. MAX8804Y/MAX8804Z DC Charging Current Programming by Series Pulses

PULSE

NUMBER

DEFAULT

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

500

500

500

500

550

550

550

550

600

600

600

600

450

450

450

Top-Off Current

Threshold (mA)

80

90

100

70

80

90

100

70

80

90

100

70

80

90

100

PULSE

NUMBER

—

15th

16th

17th

18th

19th

20th

21st

22nd

23rd

24th

25th

26th

27th

28th

—

450

400

400

400

400

650

650

650

650

700

700

700

700

500

Top-Off Current

Threshold (mA)

—

70

80

90

100

70

80

90

100

70

80

90

100

70

80

Table 3. MAX8804W DC Charging Current Programming by Series Pulses

PULSE

NUMBER

DEFAULT

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

450

450

450

450

550

550

550

550

500

500

500

500

400

400

400

Top-Off Current

Threshold (mA)

80

90

100

70

80

90

100

70

80

90

100

70

80

90

100

PULSE

NUMBER

—

15th

16th

17th

18th

19th

20th

21st

22nd

23rd

24th

25th

26th

27th

28th

—

400

600

600

600

600

650

650

650

650

700

700

700

700

450

Top-Off Current

Threshold (mA)

—

70

80

90

100

70

80

90

100

70

80

90

100

70

80

Note: This table is true when DETBAT = LOW for the MAX8804W.

When DETBAT = HIGH, the MAX8804W enters shutdown.