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参数资料
| 型号： | LTC4110EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/52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
The micropower shutdown state will be maintained if the
+
DCIN supply is removed and suf?cient battery voltage is
present (V BAT ≥ 2.7V). When DCIN is reapplied as detected
by the UVLO (see V UVI ), regardless of the level of the
SHDN pin, the shutdown state is automatically cancelled.
Register reset state is cancelled until DCIN is reapplied as
determined by the DCDIV pin.
+
V SNS
–
R CSP1
R SNS(BAT)
R CSN1
+
R CSP2
R CSN2
CSP
CSN
BAT
+
–
V FB
INPUT
CURRENT
AMPLIFIER
–
V ICHG =
R ICHG /(R CSP1 + R CSP2 )*V SNS
–
CURRENT
LOOP EA
+
I CHG
R ICHG
5V
LTC4110
+
–
VOLTAGE
LOOP EA
+
BANDGAP
+
–
SHDN
I ISD
SHUTDOWN
+
–
REFERENCE
VOLTAGE
ADJUSTED BY
V CHG PIN
4110 F09
4110 F08
Figure 8. Shutdown Control Input
In shutdown; charge, calibration and backup modes are
inhibited, all registers are set to their default states (with
exception of the backup fault bit register), the internal
timer is reset and oscillator disabled, the status pins;
ACPb, GPIO1, GPIO2 and GPIO3 are a high impedance
and the LTC4110 is put into a micropower state. While
in shutdown the SMBus is disabled and the SDA and
SCL pins are high impedance. In addition, the shutdown
state will disconnect loads from the battery to prevent its
discharge as follows:
? The BATID pin is forced to the battery voltage to turn
off the battery P-MOSFETs for isolation of the load from
the battery
? The CHGFET and DCHFET pins are forced to GND to
turn off the ?yback switcher N-MOSFETs
? Current into the BAT pin is minimized. Also the V DD and
V REF pin voltages will fall to zero.
While in shutdown, the LTC4110 will draw a small current
from battery (I BSD ) if the DCIN supply is absent. If the SHDN
pin is open an internal weak pull-up current (I ISD ) pulls the
pin voltage up thereby entering the shutdown state.
I TH
+
Figure 9. LTC4110 PWM Engine
The voltage across the external current programming
resistor R SNS(BAT) is averaged by the RC network con-
nected to the CSP and CSN pins and then ampli?ed by a
ratio of R ICHG /(R CSP1 + R CSP2 ). This ampli?ed voltage is
compared with the bandgap reference through the cur-
rent loop error ampli?er to adjust the I TH pin which sets
the current comparator threshold to maintain a constant
charging current. Once the battery voltage rises to close
to the programmed ?oat voltage, the voltage loop error
ampli?er gradually pulls the I TH pin low, reduces the charg-
ing current and maintain a constant voltage charging.
C/x CHARGE TERMINATION
LTC4110 monitors the charging current through the volt-
age on the I CHG pin, once the current drops below 20% of
the bulk charging current, an internal C/x comparator is
tripped, and the LTC4110 will enter top-off charge stage
if standard Li-Ion battery mode is selected or release the
GPI01 pin if no-host SLA battery mode is selected. The
actual x value depends on the programmed charging cur-
rent and the C rate of the battery.
PWM OPERATION
A conceptual diagram of the LTC4110 PWM engine is
shown in Figure 9.
x =
C
I CHG
?5
4110fb
24
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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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