MP2608 datasheet(10/12 Pages) MPS

10 / 12 page

MP2608- 28V, 1A DUAL INPUT LINEAR BATTERY CHARGER WITH TIMER

MP2608 Rev. 0.9

www.MonolithicPower.com

8/29/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

Table 1—RCHG and ICHG Relationship

RCHG (kΩ)

ICHG (mA)

TBD

Figure 3—Charge Current vs. 1/RPGM

Resistance

VIN

STATUS

POR Threshold

FAULT

15 Cycles to

1/8 TIMEOUT

VBATT

VMIN

VRECHARGE

IMIN

t0 t1t2 t3

t6t7

2.6V

15 Cycles

ICHARGE

Figure 4—MP2608 Typical Re-Charging

Waveforms

Charge Status and Fault Indication

The open drain pin STATUS is used to indicate

charging status. While battery is being charged,

the STATUS pin is pulled low, when the battery

full condition is reached or any other condition

prevents

the

charger

from

charging,

the

STATUS

pin will become a floating. STATUS is

then latched till a new charge cycle is started.

Upon a time-out fault event happen, the FAULT

pin is pulled low. When the VBATT is lower than

2.6V for 1/8th of timeout period or the charging

can not reach EOC status before the timeout

happens, this fault status is latched, the charging

is suspended, and the FAULT pin is pulled low.

To clear this fault, either the VIN or VUSB should

be recycled. One time-out period is equivalent to

215 oscillator clock cycles. With a 1µF capacitor

on the TMR pin, it takes 3.64 hours.

The Power On and recharge cycle are illustrated

in Figure 4.

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