参数资料
型号: LTC4155IUFD#TRPBF
厂商: Linear Technology
文件页数: 29/52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 3. Interrupt Mask Register
Table 8, where the 500mA and 900mA settings also cor-
INTERRUPT MASK REGISTER (IMR)
SUB ADDRESS 0x06
DIRECTION
REG6
Write/Clear Interrupt, Read
respond to USB compatible current limits. If input power is
removed and reapplied, the LTC4155 will once again default
to 100mA mode until commanded to do otherwise by I 2 C.
D7
D6
D5
D4
D3
D2
D1
D0
If the 100mA USB default current limit is insufficient for
ENABLE_CHARGER_INT
ENABLE_FAULT_INT
ENABLE_EXTPWR_INT
ENABLE_OTG_INT
ENABLE_AT_ILIM_INT
1
1
1
1
1
the application and USB compliance is not necessary, an
alternate non-USB compliant default input current may
be programmed with a second resistor on the CLPROG1
pin, as shown in Figure 6.
The resistor should be sized using the following equation:
ENABLE_INPUT_UVCL_INT
Table 4. Interrupt Trigger Sources
1
STATUS
R CLPROG1 =
( I VBUSLIM – I VBUSQ
1.200V
)
? ( 991 )
MASK CATEGORY
ENABLE_CHARGER_INT
ENABLE_FAULT_INT
ENABLE_EXTPWR_INT
ENABLE_OTG_INT
ENABLE_AT_ILIM_INT
ENABLE_INPUT_UVCL_INT
STATUS TRIGGERS
CHARGER_STATUS[2:0]
OVP_ACTIVE
BAD_CELL
OTG_FAULT
NTC_HOT_FAULT
USBSNS_GOOD
WALLSNS_GOOD
EXT_PWR_GOOD
OTG_ENABLED
ID_PIN_DETECT
AT_INPUT_ILIM
INPUT_UVCL_ACTIVE
REGISTERS
0x03
0x03
0x04
0x04
0x03
0x04
0x04
When input power is applied, the LTC4155 will default
to the current limit set by the resistor connected to the
CLPROG1 pin. The I 2 C bus master may then subsequently
change the input current limit to any of the other modes
listed in Table 8, which require a second 1.21k program-
ming resistor on the CLPROG2 pin. The I 2 C master may
also change back to the default input current limit at any
time by setting the appropriate USBILIM or WALLILIM
bits to the CLPROG1 mode. If input power is removed
and reapplied at any time, the LTC4155 will again default
to the CLPROG1 custom input current limit.
Alternate Default Input Current Limit
For USB compatible operation, connect both the CLPROG1
and CLPROG2 pins to a single 1.21k 1% resistor, as
shown in Figure 5. When input power is applied, the
LTC4155 will default to the 100mA input current limit
mode. The I 2 C bus master may then subsequently change
the input current limit to any of the other modes listed in
LTC4155
The contents of USBILIM[4:0] and WALLILIM[4:0] always
contain the currently selected input current modes, which
may be different from the data last written by the I 2 C bus
master if input power was subsequently removed or was
not present. The I 2 C bus master can read the above two
registers at any time to determine the active input current
limit mode.
LTC4155
CLPROG1
CLPROG2
4155 F05
CLPROG1
R1
CLPROG2
R2
4155 F06
Figure 5. USB Default Input Current Limit
Figure 6. Non-USB Default Input Current Limit
4155fc
29
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