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參數資料
| 型號： | LTC1760 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Smart Battery System Manager |
| 中文描述： | 雙智能電池系統管理 |
| 文件頁數： | 30/44頁 |
| 文件大?。?/td> | 379K |
| 代理商： | LTC1760 |
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LTC1760
30
sn1760 1760is
–
+
+
–
GB1I
GB1O
Q8
Q7
FROM
BATTERY
1
BAT1
SCP
25mV
20mV
OFF
OFF
EAP
CP
SWP
TO LOAD
C
L
R
SC
Figure 6. PowerPath Driver Equivalent Circuit
The top MOSFET driver is powered from a floating boot-
strap capacitor C4. This capacitor is normally recharged
from V
CC
through an external diode when the top MOSFET
is turned off. As V
IN
decreases towards the selected
battery voltage, the converter will attempt to turn on the
top MOSFET continuously (“dropout’’). A dropout timer
detects this condition and forces the top MOSFET to turn
off, and the bottom MOSFET on, for about 200ns at 40
μ
s
intervals to recharge the bootstrap capacitor.
7.1 Charge MUX Switches
The equivalent circuit of a charge MUX switch driver is
shown in Figure 5. If the charger controller is not enabled,
the charge MUX drivers will drive the gate and source of
the series connected MOSFETs to a low voltage and the
switch is off. When the charger controller is on, the charge
MUX driver will keep the MOSFETs off until the voltage at
CSN rises at least 35mV above the battery voltage. GCH1
is then driven with an error amplifier EAC until the voltage
between BAT1 and CSN satisfies the error amplifier or until
GCH1 is clamped by the internal Zener diode. The time
required to close the switch could be quite long (many ms)
due to the small currents output by the error amp and
depending upon the size of the MOSFET switch.
If the voltage at CSN decreases below V
BAT1
– 20mV a
comparator CC quickly turns off the MOSFETs to prevent
reverse current from flowing in the switches. In essence,
this system performs as a low forward voltage diode.
Operation is identical for BAT2.
7.2 Dual Charging
Note that the charge MUX switch drivers will operate
together to allow both batteries to be charged simulta-
neously. If both charge MUX switch drivers are enabled,
only the battery with the lowest voltage will be charged
until its voltage rises to equal the higher voltage battery.
The charge current will then share between the batteries
according to the capacity of each battery.
When batteries are controlled charging, only batteries
with voltages above V
CHMIN
are allowed to charge. When
a battery is wake-up charging this restriction does not
apply.
8 PowerPath Controller
The PowerPath switches are turned on and off by the
power management algorithm. The external PFETs are
usually connected as an input switch and an output switch.
The output switch PFET is connected in series with the
input PFET and the positive side of the short-circuit
sensing resistor, R
SC
. The input switch is connected in
series between the power source and the output PFET. The
PowerPath switch driver equivalent circuit is shown in
Figure 6. The output PFET is driven ON or OFF by the output
side driver controlling pin GB10. The gate of the input PFET
is driven by an error amplifier which monitors the voltage
between the input power source (BAT1 in this case) and
SCP. If the switch is turned off, the two outputs are driven
to the higher of the two voltages present across the input/
SCP terminals of the switch. When the switch is instructed
OPERATIOU
–
+
+
–
GCH1
SCH1
Q4
Q3
TO
BATTERY
1
FROM
CHARGER
BAT1
CSN
35mV
20mV
OFF
DCIN + 10V
(CHARGE PUMPED)
10k
1760 F05
EAC
CC
Figure 5.Charge MUX Switch Driver Equivalent Circuit
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1760CFW | 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC1760CFW#PBF | 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC1760CFW#PBF | 制造商:Linear Technology 功能描述:Battery Management IC 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 4.28A, TSSOP-48 |
| LTC1760CFW#TR | 功能描述:IC MANAGER BATTERY SYS 48-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC1760CFW#TRPBF | 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
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