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| 型号： | LTC4110EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 25/52页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY BACKUP MANAGER 38-QFN |
| 标准包装： | 52 |
| 功能： | 备份管理 |
| 电池化学： | 铅酸，锂离子，锂聚合物，镍镉，镍氢，超级电容器 |
| 电源电压： | 4.5 V ~ 19 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
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LTC4110
OPERATION
Where:
V INT
C = C rate of the battery
R THA
1.13k
THA_SELB
I CHG = Programmed charging current
For Example, if we charge a 3Ah battery with 1A current,
then x = 15.
THA
V INT
MUX
HI_REF
REF LO_REF
+
–
+
–
TH_HI
TH_LO
SafetySignal
SAFETYSIGNAL DECODER
R THB
54.9k
THB_SELB
CONTROL
Table 3. SafetySignal State Ranges (Except SLA)
C SS
THB
R SafetySignal
LATCH
RES_OR
RES_COLD
RES_HOT
SafetySignal
CHARGE
RES_UR
RESISTANCE
0Ω to 500Ω
CHARGE STATUS BITS
RES_UR, RES_HOT,
DESCRIPTION
Under range
Figure 10. Battery Safety Decoder (Except SLA)
4110 F10
BATTERY_PRESENT
500Ω to 3k
RES_HOT, BATTERY_PRESENT
Hot
then RES_C0LD ≥ RES_IDEAL threshold, RES_IDEAL ≥
3kΩ to 30k BATTERY_PRESENT Ideal
30k to 100k RES_COLD, BATTERY_PRESENT Cold
Above 100k RES_OR, RES_COLD Overrange
Note: The under range detection scheme is a very important feature of the
LTC4110. The R THA /R SafetySignal divider trip point of 0.307 ? 4.75V = 1.46V
is well above the 0.047 ? V DD = 140mV threshold of a system using a 10k
pull-up. A system using a 10k pull-up would not be able to resolve the
important under range to a hot transition point with a modest 100mV of
ground offset between battery and SafetySignal detection circuitry. Such
offsets are anticipated when charging at normal current levels.
Table 4. SafetySignal for SLA (7.256k Between THA and THB)
SafetySignal
CHARGE
RESISTANCE CHARGE STATUS BITS DESCRIPTION
RES_HOT threshold, and ?nally the RES_HOT ≥ RES_UR
threshold. Once the SafetySignal range is determined, the
lower value thresholds are not sampled. The SafetySignal
decoder block uses the previously determined SafetySignal
value to provide the appropriate adjustment in threshold to
add hysteresis. The R THB resistor value is used to measure
the RES_OR ≥ RES_COLD and RES_COLD ≥ RES_IDEAL
thresholds by connecting the THB pin to an internal voltage
and measuring the voltage resultant on the THA pin. The
R THA resistor value is used to measure the RES_IDEAL ≥
RES_HOT and RES_HOT ≥ RES_UR thresholds by con-
necting the THA pin to the internal voltage and measuring
the resultant voltage on the THB pin. The SafetySignal
impedance is interpreted according to Table 3.
0 Ω to 3.1k
3.1k to 114k
114k
RES_HOT,
BATTERY_PRESENT
BATTERY_PRESENT
RES_COLD, RES_OR
Hot
Ideal
Battery Removal
When the DCIN supply is present, a full sampling of the
SafetySignal is performed every 27ms. When the supply is
absent, a low power limited sampling of the SafetySignal is
performed every 218ms. A full sampling of the thermistor
state is performed only if a change of battery presence is
This decoder measures the resistance of the SafetySignal
and features high noise immunity at critical trip points.
The SafetySignal decoder is shown in Figure 10.
The value of R THA is 1.13k and R THB is 54.9k. SafetySignal
sensing is accomplished by a state machine that recon?gures
the switches of Figure 10 using THA_SELB and THB_SELB,
a selectable reference generator, and two comparators.
The state machine successively samples the SafetySignal
value starting with the RES_OR ≥ RES_COLD threshold,
detected when the supply is not present.
GPIO AND STATUS FUNCTIONS
All of the GPIO pins are open drain with N-MOSFET drivers
capable of sinking current suf?cient to drive an LED (see
V OL ). The pins are not capable of sourcing any current and
instead enter a Hi-Z mode when the output is not low. An
external pull-up will be required to create any high output
logic state.
4110fb
25
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相关代理商/技术参数 |
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|---|---|
| LTC4110EUHF-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4120IUD#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER, 400MA, QFN-16, Battery Type:Li-Ion, Li-Polymer, Input Voltage:4 |
| LTC4150 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, High-Side Current Sense |
| LTC4150_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Coulomb Counter/ Battery Gas Gauge |
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