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参数资料
| 型号： | DS2720CU/T&R |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | MICRO, SOP-8 |
| 文件页数： | 17/21页 |
| 文件大小： | 264K |
| 代理商： | DS2720CU/T&R |
DS2720
5 of 21
POWER MODES
The DS2720 has two power modes: active and sleep. While in active mode, the DS2720 continuously
performs safety monitoring. In sleep mode, the DS2720 ceases monitoring activities and drives both the
charge and discharge protection FETs to an “off state”. Upon returning to the active mode from the sleep
mode, DS2720 resumes safety monitoring and conditionally turns on the protection FETs.
Table 2. POWER MODE TRANSITION CONDITIONS
Active
Sleep
Sleep
Active
(1)
VDD < VUV
PS pulled to VSS or
VPLS > VDD + VCH
(1) DS2720 does not transition to Active Mode if VDD < VSC.
RECHARGEABLE Li+ PROTECTION CIRCUITRY
During active mode, the DS2720 constantly monitors cell voltage and voltage drop across the FETs to
protect the battery from overcharge (overvoltage), overdischarge (undervoltage), and excessive discharge
currents (overcurrent, short circuit). Conditions and DS2720 responses are described in the sections
below and summarized in Table 3 and Figure 3.
Table 3. PROTECTION CONDITIONS AND DS2720 RESPONSES
ACTIVATION
CONDITION
NAME
THRESHOLD
DELAY
RESPONSE
RELEASE
THRESHOLD
Overvoltage
VDD > VOV
tOVD
(1)
CC = VOLCC
VDD < VCE or
VDD - VPLS > VOC
Undervoltage
VSC < VDD < VUV
tUVD
CC = VOLCC
DC = VOLDC
VPLS > VDD + VCH and
VDD > VUV
(charger connected)
Recovery Charge
VDD < VSC or
(while in active
mode) VDD < VCE
RTST enabled
(2)
VDD
VCE
Overcurrent
VDD - VPLS > VOC
tOCD
CC = VOLCC
DC = VOLCC
VPLS > VDD - VOC
(3)
Short Circuit
VDD < VSC
tSCD
CC = VOLCC
DC = VOLDC
VPLS > VDD - VOC
(3)
Overtemperature
Tdevice > TMAX
CC = VOLCC
DC = VOLDC
Tdevice < TMAX
All voltages are with respect to VSS.
(1) During transition from sleep to active, tOVD = 0.
(2) Recovery charge current is limited by RTST and forward voltage of blocking diode, which prevents discharging through
RTST when recovery charge enabled.
(3) With test current ITST flowing from VDD to PLS (pullup on PLS).
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