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參數(shù)資料
| 型號(hào)： | LTC4071IDDB#TRMPBF |
| 廠(chǎng)商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件頁(yè)數(shù)： | 15/18頁(yè) |
| 文件大?。?/td> | 219K |
| 代理商： | LTC4071IDDB#TRMPBF |
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LTC4071
6
4071fb
pin FuncTions
NTCBIAS (Pin 1): NTC Bias Pin. Connect a resistor from
NTCBIAS to NTC, and a thermistor from NTC to GND. Float
NTCBIAS when not in use. Minimize parasitic capacitance
on this pin.
NTC (Pin 2): Input to the Negative Temperature Coefficient
Thermistor Monitoring Circuit. The NTC pin connects to
a negative temperature coefficient thermistor which is
typically co-packaged with the battery to determine the
temperatureofthebattery.Ifthebatterytemperatureistoo
high, the float voltage is reduced. Connect a low drift bias
resistor from NTCBIAS to NTC and a thermistor from NTC
to GND. When not in use, connect NTC to VCC. Minimize
parasitic capacitance on this pin.
ADJ (Pin 3): Float Voltage Adjust Pin. Connect ADJ to GND
to program 4.0V float voltage. Disconnect ADJ to program
4.1V float voltage. Connect ADJ to VCC to program 4.2V
float voltage. The float voltage is also adjusted by the NTC
thermistor.
HBO (Pin 4): High Battery Monitor Output (Active High).
HBO is a CMOS output that indicates that the battery is
almost fully charged and current is being shunted away
from VCC. This pin is driven high when VCC rises to within
VHBTH of the effective float voltage, VFLOAT_EFF. The ab-
solute value of this threshold depends on ADJ and NTC
both of which affect the float voltage. HBO is driven low
when VCC falls by more than (VHBTH + VHBHY) below the
effective float voltage. Refer to Table 1 for the effective
float voltage.
LBSEL (Pin 5): Low Battery Disconnect Select Pin. Con-
nect LBSEL to GND to select a low battery disconnect
level of 3.2V, connect LBSEL to VCC to select a low battery
disconnect level of 2.7V. Do not float.
GND (Pin 6, Exposed Pad Pin 9): Ground. The exposed
package pad has no internal electrical connection but
must be connected to PCB ground for maximum heat
transfer.
BAT (Pin 7): Battery Pin. Battery charge current is sourced
from VCC through this pin when an external supply is
present. BAT supplies current to VCC from this pin when
no other source of power is available. If BAT falls below
VLBD this pin disconnects the battery from VCC protecting
the battery from discharge by the load when no external
power supply is present.
VCC (Pin 8): Input Supply Pin. Attach system load to this
pin. The input supply voltage is regulated to 4.0V, 4.1V,
or 4.2V depending on the ADJ pin state (see the ADJ pin
description for more detail). This pin can sink up to 50mA
in order to keep the voltage regulation within accuracy
limits. Decouple to GND with a capacitor, CIN, of at least
0.1F, use a larger decoupling cap to handle high peak
load currents.
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| LTC4071EDDB#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
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