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| 型号： | DS2790E+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/41页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
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DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
LITHIUM-ION PROTECTION
For safety, lithium-Ion cell protection functions are handled by a completely independent state machine. Application
firmware can disable the protection FETs, but is not able to override the protector and enable the FETs. During
active operation (CPU or Analog mode), the DS2790 constantly monitors cell voltage and current to protect the
battery from overcharge (overvoltage), overdischarge (undervoltage), excessive charge and discharge currents
(overcurrent, short circuit), and extreme temperatures (overtemperature, undertemperature). Protection conditions
and DS2790 responses are described in the following sections and summarized in Table 13 and Figure 18.
Table 13. Lithium-Ion P rotection Conditions and DS2790 Responses
ACTIVATION
CONDITION
Overvoltage
Undervoltage
Overcurrent, Charge
Overcurrent, Discharge
Short Circuit
Charge Overtemperature
Charge Undertemperature
Discharge Overtemperature
Discharge Undertemperature
THRESHOLD
V IN > V OV
V IN < V UV
V IS > V OC
V IS < -V OC
V IS > V SC
T A > T CH (4)
T A ≤ T CL (4)
T A > T DH (4)
T A ≤ T DL (4)
DELAY
t OVD
t UVD
t OCD
t OCD
t SCD
RESPONSE
CC Low
CC Low, DC Low
CC Low, DC Low
DC Low
DC Low
CC Low
CC Low
DC Low
DC Low
RELEASE THRESHOLD
V IN < V CE , or
V IS ≤ -2mV
V PLS > V IN + 0.15V (1)
(charger connected)
V PLS < V DD - V TP (2)
V PLS > V DD - V TP (3)
V PLS > V DD - V TP (3)
T A ≤ T CH (4)
T A > T CL (4)
T A ≤ T DH (4)
T A > T DL (4)
V IS = V IS1 - V IS2 . Off = V PLS for CC and V DD for DC. . All voltages are with respect to V SS . I SNS references current delivered from pin SNS.
Under-/Overtemp conditions have no activation delay from the time the Temperature register updates. The temperature register result is an
average over 220ms, this provides protection against the MOSFETs oscillating.
Note 1:
Note 2:
Note 3:
Note 4:
If V IN < V UV , release is delayed until the recovery charge current (I RC ) charges the battery and allows V IN to exceed V UV .
With test current I TST flowing from PLS to V SS (pulldown on PLS).
With test current I TST flowing from V DD to PLS (pullup on PLS).
Temperature faults must be enabled through the TLIME bit in password protected trim memory. Temperature fault thresholds are
determined by the state of TLIM[1:0]. See Password Protected User Trim.
Overvoltage, OV. If the cell voltage on V IN exceeds the overvoltage threshold, V OV , for a period longer than
overvoltage delay, t OVD , the DS2790 shuts off the external charge FET and sets the OVF bit in the protection
register. When the cell voltage falls below charge enable threshold V CE , the DS2790 re-enables the charge FET
(unless another protection condition prevents it). Discharging remains enabled during overvoltage, and the DS2790
re-enables the charge FET before V IN < V CE if a discharge current of V IS ≤ -2mV is detected.
Undervoltage, UV. If the voltage of the cell drops below undervoltage threshold, V UV , for a period longer than
undervoltage delay, t UVD , the DS2790 shuts off the charge and discharge FETs and sets the UVF bit in the
protection register. The DS2790 provides a current-limited (I RC ) recovery charge path from PLS to V DD to gently
charge severely depleted cells. The recovery path is enabled when 0 ≤ V IN < V CE . Once V IN exceeds V UV the
DS2790 returns to normal operation.
Charge Overcurrent, COC. The voltage difference between the IS1 pin and the IS2 pin (V IS = V IS1 - V IS2 ) is the
filtered voltage drop across the current-sense resistor. If V IS exceeds overcurrent threshold V OC for a period longer
than overcurrent delay t OCD , the DS2790 shuts off both external FETs and sets the COCF bit in the protection
register. The charge current path is not re-established until the voltage on the PLS pin drops below V DD - V TP . The
DS2790 provides a test current of value I TST from PLS to V SS to pull PLS down to detect the removal of the
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相关代理商/技术参数 |
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|---|---|
| DS2790E+ | 功能描述:IC FUEL GAUGE BATT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| DS2790E+T&R | 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE BATT 28TSSOP |
| DS2790E+T&R | 功能描述:IC FUEL GAUGE BATT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| DS2790G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable 1-Cell Li-Ion Fuel Gauge and Protector |
| DS2790G+ | 功能描述:IC FUEL GAUGE BATT 28-TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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