MAX1924X 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1924X

Advanced Li+ Battery-Pack Protectors

Maxim Integrated 

Advanced Li+ Battery-Pack Protectors

VUV_TH = 2.3V typ &

VOV_TH = 4.25V typ

SHUTDOWN

DSO, CGO, TKO = H

VSRC > VB4P NO

+ 0.1V

YES

TKO = L

VCC > 4.5V NO

YES

STANDBY = 79ms

RESET UVF

NO VCELL < VUV_TH

YES

LATCH UVF = UVF + 1

NO VCELL > VOV_TH

RESET OVF

MAX1924 VOV_HYT = 200mV

MAX1894 VOV_HYT = 0

TKO, CGO = H

YES

LATCH OVF = OVF + 1

YES

OVF = 4

NO

RESET VOV_TH = 4.25V typ

NO

UVF = 4

YES

NORMAL OPERATION

SHUTDOWN PIN

OPERATION

NO

SHDN = H

SHUTDOWN

DSO, CGO,

NO

TKO = H

YES

VSRC > VB4P + 0.1V

YES

DSO, CGO, TKO = H

NORMAL OPERATION

CONTROL PIN

OPERATION

NO

CTL = H

YES

VSRC > VB4P + 0.1V

NO

YES

CGO = DSO = H

Figure 2. Undervoltage and Overvoltage Protection Flow Chart

Pack-short current fault is latched and is not reset until

the MAX1894/MAX1924 detect a reversal in the direc-

tion of current flow. A charger must be applied to

reverse the current flow (Figure 7).

DSO, CGO, TKO = H

Figure 3. Shutdown and Control Pin Flow Charts

Design Procedure

Fast and Trickle-Charge Paths

The MAX1894/MAX1924 offer the designer the flexibility

of two charging paths: a fast charging path and a trick-

le-charge path (see Figure 1). Trickle charging is

enabled and TKO is set low when one or more cells are

belows VUV_TH.

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