参数资料
型号: LTC4155IUFD#TRPBF
厂商: Linear Technology
文件页数: 40/52页
文件大小: 0K
描述: IC I2C POWER MANAGER DUAL 28QFN
标准包装: 2,500
系列: PowerPath™
功能: 充电管理,电源管理
电池化学: 锂离子(Li-Ion)、锂聚合物(Li-Pol)
电源电压: 4.35 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-WFQFN 裸露焊盘
供应商设备封装: 28-QFN(4x5)
包装: 带卷 (TR)
LTC4155
OPERATION
Table 34. Input Undervoltage Current Limit (Brownout
Detection) Interrupt Mask
INPUT UNDERVOLTAGE CURRENT LIMIT (BROWNOUT
Table 35. USB On-The-Go Step-Up Voltage Converter
Manual Activation
USB On-The-Go STEP-UP VOLTAGE CONVERTER MANUAL
DETECTION) INTERRUPT MASK
REG6
ACTIVATION
REG6
SUB ADDRESS
DIRECTION
0x06
ENABLE_INPUT_UVCL_INT
Write and Readback
SUB ADDRESS
DIRECTION
0x06
REQUEST_OTG
Write and Readback
INTERRUPT ENABLE
STEP-UP
STATUS
D7
D6
D5
D4
D3
D2
D1
D0
REGULATOR
Input Undervoltage
ACTIVATION
D7
D6
D5
D4
D3
D2
D1
D0
Current Limit
0
Step-Up Regulator
Interrupts Disabled*
Input Undervoltage
Activation Auto-
matic or Disabled*
0
Current Limit
Interrupts Enabled
1
Enable Step-Up
Voltage Regulator
1
*Default.
Interrupt triggered by any change in INPUT_UVCL_ACTIVE. Any data
written to sub address 0x06 has side effect of clearing any pending
interrupt request.
*Default.
Regulator cannot be activated if voltage is applied to either the USB or
WALL inputs. Automatic activation controlled by LOCKOUT_ID_PIN. Any
data written to sub address 0x06 has side effect of clearing any pending
interrupt request.
APPLICATIONS INFORMATION
Alternate NTC Thermistors and Biasing
The LTC4155 provides temperature qualified charging if a
grounded thermistor and a bias resistor are connected to the
NTC pin. Charging is paused if the temperature rises above
an NTC_TOO_HOT limit or falls below an NTC_TOO_COLD
R BIAS
R TEMP_RANGE
LTC4155
NTCBIAS
NTC
limit. By using a Vishay curve 2 thermistor and a bias resis-
tor whose value is equal to the room temperature resistance
of the thermistor (r 25 ), the upper and lower tempera-
T R NTC
4155 F09
tures are preprogrammed to approximately 40°C and
0°C, respectively. The NTC_HOT_FAULT threshold which
optionally generates an interrupt and/or enables the
overtemperature battery conditioner is preprogrammed
to approximately 60°C.
With minor modifications to the thermistor bias network
as shown in Figure 9, it is possible to adjust either one or
two of the three temperature thresholds with the constraint
that it is usually not possible to move the temperature
Figure 9. Alternate NTC Bias Network
In the explanation below, the following notation is used.
r 25
NTC thermistor value at 25°C.
R BIAS
Low drift bias resistor, connected between the
NTCBIAS and NTC pins.
thresholds closer together. Intuitively, this would require
increased temperature sensitivity from the thermistor.
4155fc
40
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