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參數(shù)資料
| 型號： | LTC4155IUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 35/52頁 |
| 文件大?。?/td> | 473K |
| 代理商： | LTC4155IUFD#TRPBF |
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LTC4155
40
4155f
Table 34. Input Undervoltage Current Limit (Brownout
Detection) Interrupt Mask
INPUT UNDERVOLTAGE CURRENT LIMIT (BROWNOUT
DETECTION) INTERRUPT MASK
REG6
SUB ADDRESS
0x06
ENABLE_INPUT_UVCL_INT
DIRECTION
Write and Readback
INTERRUPT ENABLE
STATUS
D7
D6
D5
D4
D3
D2
D1
D0
Input Undervoltage
Current Limit
Interrupts Disabled*
0
Input Undervoltage
Current Limit
Interrupts Enabled
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.
APPLICATIONS INFORMATION
Figure 9. Alternate NTC Bias Network
Alternate NTC Thermistors and Biasing
The LTC4155 provides temperature qualified charging if a
groundedthermistorandabiasresistorareconnectedtothe
NTC pin. Charging is paused if the temperature rises above
an NTC_TOO_HOT limit or falls below an NTC_TOO_COLD
limit.ByusingaVishaycurve2thermistorandabiasresis-
torwhosevalueisequaltotheroomtemperatureresistance
of the thermistor (r25), the upper and lower tempera-
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
twoofthethreetemperaturethresholdswiththeconstraint
that it is usually not possible to move the temperature
thresholds closer together. Intuitively, this would require
increased temperature sensitivity from the thermistor.
OPERATION
In the explanation below, the following notation is used.
r25
NTC thermistor value at 25°C.
RBIAS
Low drift bias resistor, connected between the
NTCBIAS and NTC pins.
Table 35. USB On-The-Go Step-Up Voltage Converter
Manual Activation
USB On-The-Go STEP-UP VOLTAGE CONVERTER MANUAL
ACTIVATION
REG6
SUB ADDRESS
0x06
REQUEST_OTG
DIRECTION
Write and Readback
STEP-UP
REGULATOR
ACTIVATION
D7
D6
D5
D4
D3
D2
D1
D0
Step-Up Regulator
Activation Auto-
matic or Disabled*
0
Enable Step-Up
Voltage Regulator
1
*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.
RNTC
RBIAS
LTC4155
4155 F09
NTC
NTCBIAS
T
RTEMP_RANGE
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